8920A/8921A
NOTE
This manual documents the Model 8920A and 8921A True RMS
Voltmeters and their assemblies at the revision levels shown in
Appendix 7A. If your instrument contains assemblies with different
revision letters it will be necessary to either update or backdate this
manual. Refer to the supplemental change/errata sheet for newer
assemblies or to the backdating sheet (Appendix 7A) for older
instruments.
8920A/8921A
True RMS
Voltmeter
Instruction Manual
P/N 487157
October 1978
©1980, John Fluke Mfg. Co., Inc., all rights reserved Litho in U.S.A.
====®
IFLUKEI
WARRANTY
Notwithstanding any provision of any agreement the following warranty is exclusive:
The JOHN FLUKE MFG. CO., INC., warrants each instrument it manufactures to be free from defects in material and
workmanship under normal use and service for the period of 1-year from date of purchase. This warranty extends only to
the original purchaser. This warranty shall not apply to fuses, disposable batteries (rechargeable type batteries are
warranted for 90-days), or any product or parts which have been subject to misuse, neglect, accident, or abnormal
conditions of operations.
In the event of failure of a product covered by this warranty, John Fluke Mfg. Co., Inc., will repair and calibrate an instrument
returned to an authorized Service Facility within 1 year of the original purchase; provided the warrantor's examination
discloses to its satisfaction that the product was defective. The warrantor may, at its option, replace the product in lieu of
repair. With regard to any instrument returned within 1 year of the original purchase, said repairs or replacement will be
made without charge. If the failure has been caused by misuse, neglect, accident, or abnormal conditions of operations,
repairs will be billed at a nominal cost. In such case, an estimate will be submitted before work is started, if requested.
THE FOREGOING WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS, OR
ADEQUACY FOR ANY PARTICULAR PURPOSE OR USE. JOHN FLUKE MFG. CO., INC., SHALL NOT BE
LIABLE FOR ANY SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER IN CONTRACT,
TORT, OR OTHERWISE.
If any failure occurs, the following steps should be taken:
1. Notify the JOHN FLUKE MFG. CO., INC., or nearest Service facility, giving full details of the difficulty, and include
the model number, type number, and serial number. On receipt of this information, service data, or shipping
instructions will be forwarded to you.
2. On receipt of the shipping instructions, forward the instrument, transportation prepaid. Repairs will be made at
the Service Facility and the instrument returned, transportation prepaid.
SHIPPING TO MANUFACTURER FOR REPAIR OR ADJUSTMENT
All shipments of JOHN FLUKE MFG. CO., INC., instruments should be made via United Parcel Service or "Best Way"*
prepaid. The instrument should be shipped in the original packing carton; or if it is not available, use any suitable container
that is rig.id and of adequate size. If a substitute container is used, the instrument should be wrapped in paper and
surrounded with at least four inches of excelsior or similar shock-absorbing material.
CLAIM FOR DAMAGE IN SHIPMENT TO ORIGINAL PURCHASER
The instrument should be thoroughly inspected immediately upon original delivery to purchaser. All material in the
container should be checked against the enclosed packing list. The manufacturer will not be responsible for shortages
againstthe packing sheet unless notified immediately. If the instrument is damaged in any way, a claim should be filed with
the carrier immediately. (To obtain a quotation to repair shipment damage, contact the nearest Fluke Technical Center.)
Final claim and negotiations with the carrier must be completed by the customer.
The JOHN FLUKE MFG. CO., INC, will be happy to answer all applications or use questions, which will enhance your use of
this instrument. Please address your requests or correspondence to: JOHN FLUKE MFG. CO., INC., P.O. BOX C9090,
EVERETI, WASHINGTON 98206, ATIN: Sales Dept. For European Customers: Fluke (Holland) B.V., P.O. Box 2269, 5600
CG, Eindhoven, The Netherlands.
*For European customers, Air Freight prepaid.
John Fluke Mfg. Co., Inc., P.O. Box C9090, Everett, Washington 98206
Rev. 7/88
8920A/8921A
Table of Contents
TITLE
SECTION
1
INTRODUCTION ............................................. 1-1
SPECIFICTIONS .............................................. 1-2
Specifications, Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
OPERATING INSTRUCTION.S ......................................... 2-1
2-1.
2-3.
2-6.
2-8.
2-10.
2-12.
2-14.
2-16.
2-21.
2-37.
2-43.
2-50.
2-53.
2-56.
2-68.
2-70.
3
1-1
INTRODUCTION AND SPECIFICATIONS
1-1.
1-9.
1-11.
2
PAGE
INTRODUCTION .............................................
SHIPPING INFORMATION ...................................
INSTALLATION ..............................................
INPUT POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CONTROLS AND INDICATORS ...............................
OPERATING NOTES ..........................................
Fuse Replacement ............................................
Display Indications ...........................................
Measurement Connections .....................................
Input Signal Considerations ...................................
Range Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage Display Mode ........................................
dB Display Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
dBm Measurements ..........................................
Linear Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OPERATION .................................................
THEORY OF OPERATION
3-1.
3-3.
3-5.
3-10.
3-13.
3-15.
3-17.
3-20.
3-24.
3-42.
3-45.
2-1
2-1
2-1
2-2
2-2
2-4
2-4
2-4
2-4
2-6
2-6
2-6
2-6
2-7
2-8
2-8
............................................ 3·1
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OVERALL FUNCTIONAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . .
Analog Circuitry .............................................
Digital Circuitry .............................................
DETAILED BLOCK DIAGRAM DESCRIPTION ................
Signal Conditioner ...........................................
RMS Converter ..............................................
A/D Converter ..............................................
Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display and Annunciators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1
3-1
3-1
3-2
3-2
3-2
3-2
3-2
3-5
3-10
3-11
(continued on page ii)
8920A/8921A
TABLE OF CONTENTS (continued)
SECTION
4
TITLE
MAINTENANCE
4-1.
4-4.
4-5.
4-7.
4-9.
4-11.
4-13.
4-15.
4-17.
4-19.
4-21.
4-23.
4-25.
4-28.
4-30.
4-32.
4-34.
4-36.
4-38.
4-40.
4-44.
4-46.
4-48.
5
INTRODUCTION .............................................
GENERAL MAINTENANCE ...................................
Access Information ...........................................
INPUT POWER SELECTION ..................................
Cleaning ....................................................
Fuse Replacement ............................................
PERFORMANCE CHECK .....................................
Low and M)dband Performance Check (Volts Display Mode) ......
dB Display Mode Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC Low Level Check .........................................
AC Low Level Check .........................................
High Frequency Response Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CALIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low and Midband Accuracy Adjustments .......................
Linear Analog Output (8920A only) ............................
AC Low Level Calibration ....................................
High Frequency Calibration ...................................
RMS Protection Circuit Calibration ............................
TROUBLESHOOTING .........................................
RMS Sensor Replacement .....................................
A/D Calibration Resistor Selection .............................
DC Offset Resistor Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE
4-1
4-1
4-1
4-1
4-1
4-1
4-3
4-3
4-3
4-3
4-5
4-5
4-5
4-5
4-5
4-10
4-10
4-10
4-13
4-13
4-14
4-15
4-19
4-19
LIST OF REPLACEABLE PARTS ...................................... 5-1
5-1.
5-4.
INTRODUCTION ............................................. 5-2
HOW TO OBTAIN PARTS ..................................... 5-2
6
OPTION AND ACCESSORY INFORMATION ........................... 6-1
7
GENERAL INFORMATION ............................................ 7-1
7A-1
MANUAL CHANGE INFORMATION ................................... 7A-1
8
SCHEMATIC DIAGRAMS ............................................. 8-1
ii
8920A/8921A
List of Tables
TABLE
1-1.
1-2.
1-3.
1-4.
2-1.
2-2.
3-1.
3-2.
3-3.
3-4.
3-S.
4-1.
4-2.
4-3.
4-4.
4-S.
4-6.
4-7.
4-8.
4-9.
4-10.
4-11.
4-12.
60~-I.
603-2.
603-3.
603-4.
603-S.
604-1.
604-2.
TITLE
8920A/8921A Option .........................................................
8920A/8921A Accessories (for C size instruments) ................................
8920A/8921A Specifications ...................................................
8920A/8921A Option Specifications ............................................
Rack Mounting Kits .........................................................
Controls, Indicators and Connectors . . . . • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signal Conditioner Gain Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Controller Summary .........................................................
Output Range Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Over/ Underload Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Range Codes ...............................................•.•........
Recommended Test Equipment .............•..................................
Input Power Selection ...........................•.................•..........
Low and Midband Performance Check (Volts Display Mode) .....................
dB Display Mode Check ......................................................
DC Low Level Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High Frequency Response Check .............................................
Low and Midband Accuracy Adjustments ...... , •...............................
High Frequency Calibration ...................................................
8920A/8921A Troubleshooting Procedure .......................................
Attenuator Logic States ......................................................
R204 Resistive Values (mF, ±1%, l/8W) .......................................
Rl9/R34, R66/R76 Resistive Values (mF, ±1%, l/8W) ...........................
Recommended Test Equipment ................................................
Counter Output Amplitude ....................................................
Counter Output Frequency Response ...........................................
Counter Output Option Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Counter Output Option PCB Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performance Test ............................................................
Logarithmic Analog Output Option PCB Assembly ..............................
iii/iv
PAGE
1-1
1-2
1-2
1-6
2-1
2-3
3-4
3-7
3-9
3-9
3-9
4-2
4-2
4-4
4-6
4-7
4-10
4-11
4-13
4-16
4-19
4-20
4-20
603-2
603-S
603-S
603-6
603-9
604-3
604-S
8920A/8921 A
List of Illustrations
FIGURE
2-1.
2-2.
2-3.
2-4.
3-1.
3-2.
3-3.
3-4.
3-5.
3-6.
3-7.
3-8.
4-1.
4-2.
4-3.
4-4.
4-5.
4-6.
4-7.
4-8.
603-1.
603-2.
603-3.
603-4.
603-5.
603-6.
604-1.
604-2.
604-3.
604-4.
TITLE
Frontispiece . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PTI Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Controls, Indicators and Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Matched Impedance Measurement Techniques .............................
Typical Relative dB Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overall Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Detailed Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signal Conditioner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RMS Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A/D Converter, Simplified Schematic and Timing ..........................
Controller Timing (A/D Converter) .......................................
Controller Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display and Annunciators ...............................................
Low and Midband Performance Test Set-Up ...............................
DC Low Level Check Test Set-Up ........................................
AC Low Level Check Test Set-Up ........................................
High Frequency Response Check Test Set-Up ..............................
Calibration and Test Point Location ......................................
Linear Analog Output Test Set-Up (8920A only) ...........................
High Frequency Calibration Test Set-Up ..................................
A/D Waveforms (General Condition) .....................................
Counter Output Option Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Counter Output Option Simplified Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Counter Output Performance Set-Up ......................................
Counter Output Performance Test Set-Up .................................
Calibration Set-Up .....................................................
Counter Output Option PCB Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Logarithmic Analog Output Option Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Logarithmic Analog Output Option Simplified Schematic ....................
Logarithmic Analog Output Option Test Set-Up ............................
Logarithmic Analog Output Option PCB Assembly . . . . . . . . . . . . . . . . . . . . . . . . .
v
PAGE
vi
2-1
2-2
2-5
2-7
3-1
3-3
3-4
3-5
3-6
3-7
3-8
3-10
4-3
4-6
4-7
4-7
4-8
4-12
4-14
4-18
603-2
603-3
603-4
603-4
603-5
603-10
604-2
604-3
604-4
604-6
8920A/8921A
Frontispiece
vi
- - __J
8920A/8921A
Section 1
Introduction & Specifications
1-1.
INTRODUCTION
NOTE
Unless otherwise specified, all information,
figures, tables and general data presented in
this manual are applicable to both Model
8920A and 892JA True RMs Voltmeters.
1-2. The Models 8920A and 8921A are digital true rms
voltmeters, capable of accurately measuring the true rms
value of nonsinusoidal signals containing AC or AC +
DC components. Both have a frequency range of 10 Hz to
20 MHz with a full-scale crest factor of seven, and are
capable of displaying measurements in either volts or dB
units.
1-3. Selecting the VOLTS position on the dB/ VOL Ts
switch enables the volts display mode and three
applicable front panel annunciators (V, mV, and 2 MHz
MAX). In this mode, the instruments display a 3 1/2 digit
figure to indicate the true rms value of any AC or AC+
DC input signal whose amplitude is between 180 uV and
700V rms (IOOOV peak).
1-4. The dB display mode (logarithmic) is enabled when
dB is selected on the front panel dB/VOLTS display
switch. In this mode, the instruments display a 4 I/ 2 digit
dBm value of the input signal referenced to l-of-12
manually selected impedances (50 to 1200 ohms). The dB
display mode also uses three annunciators, dB,
RELATIVE REFERENCE, and 2 MHz MAX, to
establish the instrument's operating status. The
RELATIVE REFERENCE annunciatory lights
whenever the REL switch is depressed to indicate that
any further dB measurements will be referenced to the
voltage present at the time the switch was pressed. When
AUTO is selected on the AUTO/ HOLD switch (the out
position) the autorange mode selects one-of-seven input
ranges to optimize the display.
1-5. Complementing the instrument's high digital
resolution is an anlog panel meter for use in applications
that require peaking or nulling. This meter does not have
calibration markings since it is intended for peaking and
nulling indications only.
1-6. Note that both the 8920A and 8921A accomodate
floating measurements. The 8921 A safely accepts
common mode inputs up to 500V rms, or 700V peak. An
isolation circuit allows the 8920A input low to float up to
approximately 0.6V peak with respect to earth ground.
Isolation of 0.6V peak will accomodate the few hundred
millivolts of typical common mode voltage. Full operator
protection is still maintained since under fault conditions
the diode isolation circuitry conducts and insures that the
common mode voltage is never greater than one diode
drop.
1-7. Several options and accessories are available for
use with the 8920A and 8921A. The options and
accessories are listed and described in Table 1-1 and
Table 1-2. They may be ordered for factory or field
installation. Detailed information concerning each
option and accessory is given in Section 6 of this manual.
Table 1-1. 8920A/8921A Options
OPTION
DESCRIPTION
COMMENT
8920A/
8921A-003
Counter Output
Available in both
8920A & 8921A.
8920A-004
Logarithmic
Analog Output
Available in
8920Aonly.
1-1
8920A/8921 A
instruments are stacked they should be limited to 40
pounds total, and the instrument drawing the most power
should be on the top. Stacked instruments have a
horizontal air space between them to reduce heat
conduction between instruments.
Table 1-2. 8920A/8921A Accessories
(for C size instruments)
ACCESSORY
MODEL NO.
DESCRIPTION
Y2014
Rack Mounting Kit (single unit)
Y2015
Rack Mounting Kit (double unit)
Y2020
Panel Adapter (DIN size)
1-9.
SPECIFICATIONS
1-10. Detailed specifications for the Models 8920A and
8921A True RMS Voltmeter are given in Table 1-3.
1-8. The PTI (Portable Test Instrument) case is a family
of injection molded, plastic instrument packages of
various sizes which may be stacked vertically and latched
together to form portable test stations. When
1-11.
Specifications, Options
1-12. Detailed specifications for the Models 8920A and
8921A's options are given in Table 1-4.
Table 1-3. 8920A/8921A Specifications
ELECTRICAL (Basic)
The electrical specifications given assume an operating temperature of 23°C ±5°C, relative humidity up to 80%
and a minimum 90 day calibration cycle.
FUNCTIONS
AC true RMS, AC+ DC true RMS
DISPLAY .
Digital Display, Panel selectable for volts or dB: analog
peaking/nulling meter.
RANGING . . . . .
.
Autoranging, Hold to defeat Autoranging, step-up for manual
up-ranging.
AUTORANGING POINTS
Ranging up at 2000 counts.
Ranging down at 180 counts.
MAXIMUM INPUT
700V rms or 1000V peak, not to exceed 1 X 108 volts-Hz
product on any range.
RESPONSE TYPE
True RMS thermal converter, will accept: sine, complex, pulse
or random waveforms.
RESPONSE TIME
1.6 seconds typically to rated accuracy within a range, composed
of 1 second settling time and 0.6 seconds maximum digitizing time.
INPUT IMPEDANCE
2 m V to 700V range = 10 Mil/shunted by
CREST FACTOR
7 at full scale, increasing down scale by: 7 XV range 7 V input.
FREQUENCY RANGE
2 mV range - 2 MHz maximum.
20 mV - 20V range= 20 MHz maximum.
200V - 700V range= 1 MHz maximum.
< 30 pF.
ELECTRICAL (VOL TS Display Mode)
RANGES
..
RESOLUTION
1-2
2 mV, 20 mV, 200 mV, 2V, 20V, 200V and 700V.
0.05% of range.
8920A/8921 A
Table 1-3. 8920A/8921A Specifications (cont)
ELECTRICAL (dB Display Mode)
In the autorange mode the instrument appears as though it has
a single range spanning 132 dB. Transients will appear in the
readout as the transition through which the analog voltage
range points occur.
.....
dB RANGE
dB RANGE REFERENCES:
dBm REFERENCES
Twelve manually selectable impedances with which to reference a 0 dBm, 1 mW signal level. Impedances are 50, 75,
93, 110, 124, 135, 150, 300, 600, 900, 1000 and 1200 ohms.
RELATIVE dB REFERENCE
A voltage present when this switch is depressed to its REL
position is held as 0 dB reference for all other voltages.
dB RESOLUTION
.
.
.
0.01 dB.
.
ACCURACY
The accuracy specifications given below apply to the volts and dB display modes at 9% to 100% of full scale,
23° C ±5° C, 90 days.
Table -1. AC:±% of Voltage Reading or ±dB
INPUT
VOLTAGE
RANGE
10 Hz
180-700V
700V
18.0-199.9
200V
1.80-19.99
20V
.180-1.999
2V
18.0-199.9
mV
200 mV
1.80-19.99
mV
.180-1.999
mV
AC ACCURACY:
t--~~~~~~~~~~~~~~~~~~~~~~~~~~---1
20 Hz
200 kHz
50Hz
0.5%
0.1 dB
1%
0.15 dB
1 MHz
2 MHz
10MHz
20MHz
2MHz
10MHz
20MHz
0.7%
0.15 dB
5%
0.5dB
20 mV
2mV
10 Hz
2%
1%
2%
0.25 dB
0.15 dB
0.25 dB
3%
2%
3%
0.35dB
0.25 dB
0.35 dB
20 Hz
50 Hz
Temperature Coefficients:
20 Hz
(0°C-18°C, 28°C-50°C):
1 MHz
-
200 kHz
1 MHz
1 MHz
.07%fC; .006 dB/°C
20 MHz
.1%/° C;
.01 dB/°C
1-3
8920A/8921 A
Table 1-3. 8920A/8921A Specifications (cont)
Table -2. AC + DC: ±% of Voltage Reading or ±dB
INPUT
VOLTAGE
RANGE
180-700V
18.0-199.9
700V
200V
1.80-19.99
.180-1.999
18.0-199.9
mV
20V
2V
200 mV
1.80-19.99
mV
20mV
.180-1.999
mV
2mV
AC+ DC ACCURACY:
10 Hz
20 Hz
50 Hz
200 kHz
1 MHz
2MHz
10MHz
20MHz
1 MHz
2 MHz
10 MHz
20MHz
3%
0.35 dB
See Table -3
10 Hz
20 Hz
50Hz
200 kHz
NOTE: DC only measurements can also be made using the 100 Hz accuracy specification.
.5 dB/°C
5%/°C;
2 mV range
Temperature Coefficients:
(0°C-18°C, 28°C-50°C):
20 mV range and above
.5%/°C;
.05 dB/°C
Table -3. AC+ DC Accuracy (2 mV range)
ACCURACY
1 MHz-2 MHz
10 Hz- 1 MHz
5% or .5 dB
3% or .35 dB
180µV
1-4
1 mV
2mV
8920A/8921A
Table 1-3. 8920A/8921A Specifications (cont)
GENERAL
8920A isolated BNC input floating up to .6V peak.
INPUT
8921A isolated dual banana plus ground jack input.
DISPLAYS .
.
.
.
.
.
.
.
.
.
.
5, 0.3" high, digit, 7-segment LEDs with automatic decimal
point location and mV, V, dB, RELATIVE REFEREl\ICE,
and "2 MHz max annunciators". The display also incorporates
an uncalibrated analog meter for nulling and peaking.
AUTORANGING RATE:
VOLTS
700 ms max/range change; 2.2 sec max for 6 range changes.
dB
950 ms max/range change; 2.9 sec max for 6 range changes.
READING RATE
2.5 readings per second.
OVERRANGE INDICATION
Flashes maximum allowed reading for that range.
UNDERRANGE INDICATION
Flashes decimal point, but continues to display the reading.
MAXIMUM COMMON MODE
VOLTAGE . . . . .
INPUT COMMON MODE
REJECTION . . . .
LINEAR ANALOG OUTPUT
(8920A ONL YI . . . . .
8920A: 400 mV rms or 600 m V peak.
8921A: 500V rms or 700V peak.
> 80 dB@ 50 or 60 Hz (with 100 ohms in either lead).
Each range provides a linear output with 2V de equal to
2000 counts on the readout, ±1.0% of reading relative to
display; essentially 0 ohm output resistance into a >10 kn
load; non-isolated with output common the same as input
common; provided only on the 8920A.
STORAGE TEMPERATURE.
-40°C to +75°C.
OPERATING TEMPE RA TUR E
0°C to 50°C.
HUMIDITY RANGE
80% RH.
MTBF
Greater than 10,000 hours.
.
POWER.
100V ac ±10%, 120V ac ±10%, 220V ac ±10%, or 240V ac
±10% to 250V ac max. selected by internal switches, 45 to
440 Hz, 10 W max.
DIMENSIONS
40.3 cm (12.9 in.) long X 20.3 cm (8.0 in.) wide X 10.8 cm
(4.3 in.) high.
WEIGHT
..
2.47 Kgm (5 lb. 7 oz.)
1-5
8920A/8921A
Table 1-4. 8920A/8921A Option Specifications
OPTION-003, COUNTER OUTPUT OPTION
OUTPUT VOLTAGE:
100 mV peak square wave.
OUTPUT IMPEDANCE:
50 ohms.
MAXIMUM ISOLATED LEVEL:
COMPATIBILITY:
500 volts ac.
8920A and 8921A.
OPTION -004, LOGARITHMIC ANALOG OUTPUT OPTION (8920A ONLY)
OUTPUT VOLTAGE DC:
200 µV rms input= 0 dB, OV de out.
700V rms input= 131 dB, 13.1 V de out
i.e., 100 mV = 1 dB.
LINEARITY:
Within each Range: ±0.35 dB.
Over all seven Ranges: ±2 dB.
OUTPUT IMPEDANCE:
COMPATIBILITY:
1-6
1 kil.
8920A ONLY.
0
static awareness
A Message From
0
John Fluke Mfg. Co., Inc.
Some semiconductors and custom IC's can be
damaged by electrostatic discharge during
handling. This notice explains how you can
minimize the chances of destroying such devices
by:
1. Knowing that there is a problem.
2. Learning the guidelines for handling them.
3. Using the procedures, and packaging and
bench techniques that are recommended.
The Static Sensitive (S.S.) devices are identified in the Fluke technical manual parts list with the symbol
"@"
The following practices should be followed to minimize damage to S.S. devices.
3.
1.
MINIMIZE HANDLING
2.
KEEP PARTS IN ORIGINAL CONTAINERS
UNTIL READY FOR USE.
4.
DISCHARGE PERSONAL STATIC BEFORE
HANDLING DEVICES. USE A HIGH RESISTANCE GROUNDING WRIST STRAP.
HANDLE S.S. DEVICES BY THE BODY
Page 1of2
5.
USE STATIC SHIELDING CONTAINERS FOR
HANDLING AND TRANSPORT
6.
DO NOT SLIDE S.S. DEVICES OVER
ANY SURFACE
8.
WHEN REMOVING PLUG-IN ASSEMBLIES,
HANDLE ONLY BY NON-CONDUCTIVE
EDGES AND NEVER TOUCH OPEN EDGE
CONNECTOR EXCEPT AT STATIC-FREE
WORK STATION. PLACING SHORTING
STRIPS ON EDGE CONNECTOR HELPS TO
PROTECT INSTALLED SS DEVICES.
9.
HANDLE S.S. DEVICES ONLY AT A
STATIC-FREE WORK STATION
10. ONLY ANTI-STATIC TYPE SOLDERSUCKERS SHOULD BE USED.
11.
ONLY GROUNDED TIP SOLDERING
IRONS SHOULD BE USED.
A complete line of static shielding bags and accessories is available from Fluke Parts Department,
Telephone 800-526-4731 or write to:
7.
AVOID PLASTIC, VINYL AND STYROFOAM®
IN WORK AREA
JOHN FLUKE MFG. CO., INC.
PARTS DEPT. MIS 86
9028 EVERGREEN WAY
EVERETI, WA 98204
PORTIONS REPRINTED
WITH PERMISSION FROM TEKTRONIX, INC.
AND GENERAL DYNAMICS, POMONA DIV.
• Dow Chemical
Page 2 of 2
J0089D-07U8604/SE EN
Litho in U.S.A.
Rev.1 MAR 86
8920A/8921 A
Section 2
Operating Instructions
2-1.
INTRODUCTION
2-2. The information we have presented in this section
is intended to familiarize you with the capabilities and
limitations of the Models 8920A and 8921A. We have
included instructions for the installation and operation of
both models as well as a brief description and
identification of each control and indicator on the
instrument.
2-3.
and press in on the side connectors of the top case until
they seat firmly into the slots on the case below. See
Figure 2-1.
CAUTION
Before you attempt to lift a series of stacked
instruments, check each unit to ensure that its
case connectors are properly mated and
latched to the next lower instrument.
Table 2-1. Rack Mounting Kits
SHIPPING INFORMATION
MODEL NO.
2-4. The Models 8920A and 8921A are packaged and
shipped in a protective container. When you receive the
equipment, make a thorough inspection for any possible
shipping damage.
DESCRIPTION
Y2014
Rack Mounting Kit (single unit)
Y2015
Rack Mounting Kit (double unit)
Y2020
Panel Adapter (DIN size)
2-5. If you determine reshipment of the instrument is
necessary, we recommend that you use the original
container. If the original container is not available, a new
one may be obtained from the John Fluke Mfg. Co., Inc.
Please indicate the instrument's model number (8920A or
8921A) when requesting a new shipping container.
2-6.
INSTALLATION
2-7. The 8920A and 8921 A were designed for bench-top
use, or for installation in a standard 19-inch equipment
rack or panel mounted into any DIN size opening.
Available rack mounting kits are listed in Table 2-1. In
bench-top environments the 8920A/ 8921A may be
stacked with other Fluke products that use the PTI case.
To connect two or more PTI cases, pull the side
connectors out, place one case squarely on top of another
Figure 2-1. PTI Connection
2-1
8920A/8921A
2-8.
INPUT POWER
2-10.
2-9. The 8920A and 8921A can be operated from any
one of your line voltages ( 100, 120, 220 or 240V). There is
a procedure in Section 4, which describes how to alter the
line power configuration of the instrument. We do,
however, recommend that this procedure be performed
by qualified personnel only.
2-11.
CONTROLS AND INDICATORS
The 8920A/8921A controls, indicators, and
connectors are shown in Figure 2-2 and described in
Table 2-2. Features peculiar to one instrument are
identified by model number, i.e., 8920A or 8921A.
2
3
4
5
6
\
0
0
{.
(
)
'I
9
13
14
12
10
17
16
15
11
0
I
I
a
a
0
I
~
19
18
Figure 2-2. Controls, Indicators and Connectors
2-2
9
8
7
8920A/8921A
Table 2-2. Controls, Indicators and Connectors
REF
NO.
NAME
FUNCTION
INPUT
8920A - A BNC input connector. The low side is isolated from power
ground through a pair of parallel diodes.
8921A - Banana plugs provide high, low and power ground input
connections. The HI and LO terminals are isolated from power ground.
Maximum common mode voltage is 500V rms.
2
Analog Panel Meter
Uncalibrated panel meter provides analog tracking of input level; useful
for peaking and nulling indications.
3
Digital Display
LED display provides a direct readout of the input signal level; includes
decimal point and polarity.
4
Annunciators
LED's that light to indicate the selected measurement function V (volts),
mV (millivolts) or dB (decibels).
5
2 MHz MAX.
An LED that lights to indicate that the instrument has autoranged into the
2 mV range. This range has a maximum frequency limit of 2 MHz.
6
RELATIVE REFERENCE
An LED that lights to indicate that the voltmeter is in the dB display mode
and using a relative voltage reference.
7
POWER Switch
A push-push switch used to turn the instrument ON (in) and OFF (out).
8
dBm REFERENCE
Rotary switch used to manually select one-of-twelve reference impedances
when the dBm anddB display modes are selected.
9
REL/dBm
A push-push switch used to select either the relative dB or the dBm display
mode. When REL is depressed, the existing input level is used to establish
a 0 dB reference. Subsequent level changes at the input are displayed in
dB and referenced to the operator established 0 dB level. When dBm is
selected, measurements are displayed in terms of dBm and the dBm
REFERENCE setting.
10
dB/VOLTS
A push-push switch used to select either the voltage (out) or dB (in)
display mode.
11
STEP UP
A momentary pushbutton switch used to incrementally step the voltmeter
to its next higher range. This switch is enabled only when the HOLD RANGE
llllde is selected.
12
HOLD/AUTO
A push-push switch used to select the manual (HOLD) or autorange (AUTO)
mode. Selecting HOLD (in) enables manual upranging with the STEP UP
switch. Selecting AUTO (out) enables the unit to autorange.
13
LO RANGE ENABLE
A push-push switch which, when depressed adds the 2 mV range to the
autorange loop. When the switch is out the 2 mV range cannot be accessed.
14
AC+ DC/AC
A push-push switch used to include (in) or delete (out) de components
as part of the input signal level.
2-3
8920A/8921 A
Table 2·2. Controls, Indicators and Connectors (cont)
REF
NO.
NAME
15
F1
16
DIGITAL OUTPUT/
LOG ANALOG OUTPUT
FUNCTION
Line fuse, MDL 1/8A slow·blow.
An output port reserved for use with the Logarithmic Output Option ·004
(8920A only) or the I EEE-488 Interface. See Section 6 for details.
17
COUNTER OUTPUT
An output port reserved for use with the Counter Output Option ·003.
See Section 6 for details.
18
Linear Analog
A pair of banana jacks for Output accessing the de linear analog output
voltage (8920A only). This voltage is proportional to the Vrms input and
is linearly scaled; 2V de out equals a 2000 count readout. The scale
repeats for each range.
19
Input Power Connector
A 3·prong line power connector for connecting the unit to line power.
2-12.
OPERATING NOTES
2-13. The following paragraphs describe various
conditions which you should be aware of before
attempting to operate the 8920A/ 8921 A.
2-14.
2-20. The uncalibrated analog panel meter
complements the digital display by linearity tracking the
input signal level. It provides a O-to-100%-of-scale
indication for the selected range. This feature will aid you
in detecting the peak and null points of inputs having
varying levels.
Fuse Replacement
2-21.
2-15. The Model 8920A/8921A is fuse protected from
the power line. You can access the fuse by pressing and
turning (CCW) the fuse cap located on the rear panel.
When replacement is necessary use an MDL type 1/8
amp slo-blo fuse for all voltage configurations.
2-16.
Display Indications
2-17. In addition to the standard digital readout, we
have equipped the front panel display with a series of
unique visual indicators. These include an
overrange/ overload indication, an underrange
indication, and an analog meter. They function
automatically to help you make error free measurements.
2·-18. For example, when an input signal level exceeds
the display limit for the selected range an overrange will
occur. The display digits flash while the overrrange is
present. Selecting a higher range will eliminate the
overrange condition.
2-19. Measurement accuracy is uncertain when the
higher voltage ranges are used to measure low level
signals. To alert you to this condition, the decimal point
will flash when the input is too low for the selected range
(less than 180 digits). You may eliminate this underrange
indication by manually selecting a lower range or
selecting autorange.
2-4
2-22.
Measurement Connections
COAX OR OPEN LEADS
2-23. We recommend shielded or coax leads be used at
the input for low level or high frequency measurements.
Open leads (unshielded) may pick up interference from
other sources causing errors at low levels. You may
reduce high frequency errors by minimizing inductance
and capacitance between the source and the
8920A/8921A input connector. Open test leads are
otherwise adequate.
2-24.
SAFETY CONS ID ERA TIO NS
2-25. Linder normal operating conditions the
8920A/ 8921 A will not present a potential electrical shock
hazard LO the operator. However, careless use of inputlead connectors and/ or adaptors may create a shock
hazard.
WARNING
TO AVOID ELECTRICAL SHOCK HAZARD
DO NOT USE EXPOSED LO INPUT LEAD
CONNECTIONS ON THE MODEL 8921A
UNLESS CONNECTED TO THE POWER
GROUND. IF COAXIAL OR OTHER
EXPOSED CONNECTIONS ARE USED FOR
FLOATING MEASUREMENTS, A SHOCK
HAZARD MAY EXIST.
8920A/8921 A
2-26. The low input on the 8920A is connected to the
power ground through a pair of diodes (see front panel
connector). These diodes allow the low input terminal to
float up to 400 mV rms (.6V peak). Their function is two
fold; they provide isolation between input low and power
ground, and they protect the operator from the
possibility of hazardous voltages existing on the exposed
low input connector.
2-27. At first glance, 400 mV of isolation does not
appear significant. However, in most cases it provides
enough isolation to prevent ground loop currents and,
therefore, measurement errors due to ground loops.
2-33. High impedance measurements are based on the
assumption that the voltmeter's fixed IO MO input
resistance and low input capacitance will not appreciably
load or otherwise affect the circuit being measured. If
open leads are used (to hold down input capacitance) and
the measurement frequency is low, this assumption holds
true.
50Q POWER
DIVIDER
50Q
RF
SOURCE
50Q
2-28. When you connect the low input of the 8920A to a
potential greater than 400 m V above power ground, the
diode pair conducts and effectively clamps the input
common mode voltage.
2-29. Under no circumstances should you attempt to
defeat the function of the diodes. Specifically, the diodes
should not be removed, the ground return on the power
cord should not be floated, and an isolation transformer
should not be used to power the 8920A. If the diodes are
defeated, a shock hazard will exist at the low input
connector when the low input lead is floated above 30
volts.
8920A
WITH
50Q IN
50Q TERMINATION
(A)
50Q
RF
SOURCE
50UCOAX
')
WARNING
TO AVOID ELECTRICAL SHOCK HAZARD
DO NOT REMOVE OR OTHERWISE DEFEAT
THE INPUT DIODE PAIR.
50Q
TEST
CIRCUIT
L
50Q TERMINATION
50Q
TEST
CIRCUIT
8920A
WITH
50Q IN
(B)
2-30.
IMPEDANCE MATCHING
2-31. Two types of ac voltage measurements are
typically made; those involving matched impedance
systems and those where voltmeter loading is minimized
(high impedance measurements) and no impedance
matching occurs.
2-32. On the other hand, when matched impedance
systems are measured the impedance should be
determined as close as possible to the 8920A/8921A
input, thereby minimizing input inductance and
enhancing accuracy at high frequencies. This is
accomplished by including the meter as an integral part
of the circuit as shown in Figure 2-3A. Notice that the
integrity of the 500 system is maintained by using a 500
power divider. An alternate solution is shown in Figure 23B. In this case, the source is alternately connected to the
8920A and the test circuit. This allows the source to be
adjusted to a known level before being connected to the
test circuit. Since both the meter and the test circuit are
500 loads the circuit integrity is maintained.
Figure 2-3. Matched Impedance Measurement Techniques
2-34. COMMON MODE VOLTAGE
MEASUREMENTTS
2-35. The Model 8921A is equipped with isolated input
connections and can accomodate common mode
(floating) voltages as high as SOOY rms. Higher common
mode voltages may cause instrument failure. The 8920A
will accomodate common mode voltages as high as 600
mV peak, usually enough to open ground loops in the
power connections.
2-36. Even though the 8921A is capable of making
common mode measurements it is not a true balanced
input voltmeter. It does not have equal or balanced
impedances between the high and ground, and the low
and ground input terminals. On the 8921 A the LO-toground input capacitance is not matched with the highto-ground capacitance. Since the majority of voltmeter
applications do not require balanced inputs, this will
rarely present a problem.
2-5
8920A/8921 A
2-37.
NOTE
For the 2 m V range to be selected, LO
RANGE ENABLE must be depressed and the
input signal level must be less than 2 m V.
Downranging occurs at 180 digits and
upranging occurs at 2000 digits.
Input Signal Considerations
2-38. The 8920A/892IA is a true rms voltmeter and, as
such, is subject to input conditions not encountered with
the ordinary average-reading ac voltmeter. Of these, the
two most important are crest factor and input coupling.
2-39.
CREST FACTOR
2-40. Crest factor is the ratio of the peak voltage to the
rms voltage of a waveform with the de component
removed. The 8920A/892IA will accomodate signals
having crest factors of 7 at full-scale, increasing for downscale readings. Use the following formula to calculate
below full-scale crest factors capability:
7 x Range
Crest Factor:
Input
2-41.
INPUT COUPLING, AC/DC
2-42. The 8920A/892IA are equipped with a
FUNCTION switch which allows you to select either AC
or AC+DC coupling. When the switch is out, AC
coupling is selected. In this function the de component is
removed from the input signal and is not measured or
displayed. Depressing the FUNCTION switch selects
AC+ DC coupling. This function allows the
8920A/ 892IA to measure and display the true rms value
for the total input signal; ac components and de
components. You should always consider the de
component when power dissipation is being determined.
2-43.
Range Selection
2-44. Seven voltage ranges and what appears to be a
single dB range spanning I 32 dB are provided in each
instrument. Range selection is normally accomplished
automatically. Override switches (step up), however,
allow you to interrupt the autorange function and
manually increment the range.
2-45. We designed the autorange function to optimize
the display reading for a given input. Each reading is
displayed complete with decimal point and units
annunciator. Since range selection is essentially
automatic, the individual ranges are not directly defined
for the operator. Instead, underrange (flashing decimal
point) and overrange (flashing digits) indications are
provided to indicate when a range change is necessary.
2-46.
AUTORANGE
2-47. The proper measurement range is automatically
selected when the HOLD/ AUTO switch is in the AUTO
(out) position. If the LO RANGE ENABLE switch is
depressed, the meter will autorange (up and down) from
the 2 mV range to the 700V range. When LO RANGE
EN ABLE is not depressed the 2 m V range is deleted from
the available ranges.
2-6
2-48.
MANUAL
2-49. Manual range selection is accomplished by
selecting a range using the autorange mode and then
depressing the H0 LD /AUTO switch. The meter will stay
in that range regardless of input level changes. If the
range becomes invalid for a given input level, an
overrange or underrange indication will flash. If an
underrange is indicated select autorange (AUTO), and
after the proper range is selected press HOLD. For
overrange conditions momentarily press the STEP UP
switch once for each desired range increment. Holding
the switch in will increment the meter to the 700V range.
Select autorange (AUTO) to downrange.
2-50.
Voltage Display Mode
2-51. The 8920A / 892 I A will dis play a voltage input in
one of two measurement units, volts or dB. To display the
input voltage in units of volts, you must set the
dB/VOLTS switch to VOLTS. The instrument will now
display all input in units of volts or millivolts, as indicated
by the front panel annunciators (V), (mV).
2-52. A couple of points of interest about the volts
display mode are as follows: one, if the input is
completely unknown, allow the autoranging circuit to
select the appropriate range. Two, the selection of the
volts display mode will not affect any previous reference
established in the dB display mode(see following
paragraphs for additional information about
establishing a dB reference).
2-53.
dB Display Mode
2-54. When the instrument is in its dB display mode all
voltage inputs are referenced to a selected level, and
displayed as deviations (in dB) above or below that level.
If you wish to display the input voltage in dB units, you
need only to set the dB/ VOL TS switch to dB. The
instrument's front panel dB annunciator will now light,
indicating to you that the display is presenting a
measurement in dB units.
2-55. Like the voltage display mode, there are points
about the dB display mode of which you should be aware.
The instrument references all inputs to a selected level,
therefore before a meaningful measurement in db units
can be made the desired reference level (0 dB) must be
established, see RELATIVE REFERENCE Selection
and dBm REFERENCE.
8920A/8921 A
2-56.
dBm Measurements
2-57. Measurements made to a fixed I milliwatt
reference are defined as dBm. The l milliwatt reference is
generally assumed, as indicated by m. However, the
system impedance must be specified for a particular
measurement. Once the impedance is known and
selected, the instrument will display its measurements in
dBm.
2-58. The 8920A/ 8921A is equipped with a rotary
switch called dBm REFERENCE (!l). By setting the
switch to l-of-12 possible standard reference impedances
(50!1, 75!1, 93!1, llO!l, 124!1, 135!1, 150!1, 300!1, 600!1,
900!1, 1000!1, and 1200!1) you establish that impedance
as a reference. When the system impedance and the
reference are the same, the 8920A/8921A manipulates
subsequent measurements to readout in terms of dBm.
NOTE
If the 1000 ohm reference impedance is
selected (''dBV" on the rotary switch) theO dB
point will correspond to 1 V.
2-59.
dBm REFERENCE SELECTION
2-60. Use the following procedure to select a reference
impedance and enable the dBm display mode:
I.
Depress the dB/ VOL TS switch (in).
2.
Release the REL/dBm switch (out).
3. Set the dBm REFERENCE (!l)switch to
correspond with the system impedance
NOTE
The dBm REFERENCE switch does not
affect the fixed JO M!l input impedance ofthe
8920A/8921A. All impedance matching
terminations must be added by the operator.
2-61. RELATIVE MEASUREMENTS (REI \
2-62. This feature allows you to make any voltage input
a "O dB point" to which all other voltage inputs may be
referenced. For measurements at a single test point,
merely press the dB switch, then the REL switch and
watch the dB change as you make adjustments and
change components.
2-63. A typical application for the dB measurement
mode is shown in Figure 2-4. The relative reference (0 dB)
has been established at TP2. Subsequenct dB
measurements at TPI, TP3, TP4 and TP5 are displayed
(in dB) as shown.
TP2
1. Measure 1 V
2. Press dB then rel buttons
3. 1 V becomes 0 dB reference
I
TP1
-60dB
TP1
....
1lr
TP2
--
TP3
-2.5 dB
--
TP4
+14 dB
TP4
TP3
-.
TP5
+6 dB
TP5
5V
Figure 2-4. Typical Relative dB Measurements
2-7
8920A/8921 A
2-64.
RELATIVE REFERENCE SELECTION
2-65. Use the following procedure to enable the relative
(REL) display mode and select a relative (0 dB) reference.
I. Connect the reference source to the
8920A/8921A input terminals. If desired, measure
and adjust the reference supply voltage level.
2.
Select the autorange mode (AUTO).
3.
Release the REL/ dBm switch (out).
4.
Depress the dB/VOLTS switch (in).
5. With the reference level still connected to the
input terminals, depress the REL switch. The
display should now read 0 dB and the RELATIVE
REFERENCE annunciator should be lit.
OTHER dBm REFERENCES
2-66.
2-67. When a dBm reference other than those given on
the dBm REFERENCE switch is required, use the
following procedure to establish the reference:
I. Define the reference impedance (R) and
calculate V using the following formula:
V = ...,'0.001 x R
2. Apply a reference voltage such that the
8920A/8921A displays "V" with the dB/VOLTS
switch in the VOL TS position.
3.
Depress the dB/VOLTS switch (in).
4.
Depress the REL/ dBm switch (in). This
the voltage (V) as the 0 dB reference
level. Therefore, subsequent dB measurements will
be equivalent to dBm measurements as long as the
system impedance R is maintained.
t.~tablishes
NOTE
This reference will hold as long as the
REL/ dBm switch is not released and the
instrument is turned on.
2-8
2-68.
Linear Analog Output
2-69. We have provided a pair of banana jacks on the
rear of the 8920A for accessing a linear de analog output
signal. This signal is proportional to the applied input
signal and is linearly scaled; a 2V de output is equal to
2000 counts on the display. The scale is repeated for each
range so that a continuously increasing input spanning
the entire 180 µV to 700V capability of the 8920A results
is a seven cycle sawtooth output. Output accuracy is 1%
relative to the front panel reading. The output signal is
buffered, and is suitable for driving an external analog
meter, recorder, plotter, scope, etc.
2-70.
OPERATION
2-71. With reference to the preceding paragraphs use
the following procedure to turn-on and operate the
Model 8920A/8921A (refer to Section 6 for option and
accessory information):
I.
Connect the 8920A/8921A to line power.
2. Set the front panel POWER switch to ON (in).
The front panel display should light.
3. Select the appropriate input leads and connect
them to the meter's input terminals. Add
terminations as close as possible to the input
connectors, if impedance matching is required.
4. Select input coupling by setting the
FUNCTION switch to AC (out) or AC+DC (in), as
desired.
5. Select the desired range. Use automatic or
manual method, as desired.
6. Set the DISPLAY switches to select the desired
measurement mode: volts, dB, or dBm. If dB is
selected, establish a 0 dB reference.
7. Observing safety considerations, connect the
test leads to the measurement points. The results
are displayed on the 8920A/8921A readout.
8920A/8921 A
Section 3
Theory of Operation
3-1.
INTRODUCTION
analog and digital. An overall functional description of
these two sections is presented in the following
paragraphs.
3-2. The information we have compiled in this section is
the theory of operation of the 8920A and the 8921 A True
RMS Voltmeters. The theory has been divided into two
major headings; Overall Functional Description and
Detailed Block Diagram Description. To gain maximum
benefit from this section, we recommend that you read
each paragraph in the order presented while referring to
the associated figure or the appropriate schematic in
Section 8.
3-3.
3-5.
Analog Circuitry
3-6. The analog section comprises the largest portion of
the 8920A and 8921A circuitry. As shown in Figure 3-1,
this section is broken down into the following areas; the
Signal Conditioner, the RMS Converter and the Power
Supply.
OVERALL FUNCTIONAL
DESCRIPTION
3-7. Referring to Figure 3-2, you can see that the signal
being measured by either the 8920A or 8921A can be
coupled to the Signal Conditioner in one of two ways
(AC or AC+DC). When you place the FUNCTION
switch on the front panel to the AC position all input
3-4. As you can see in Figure 3-1, the circuitry of the
8920A and 8921A can be divided into two sections;
LINEAR ANALOG
OUTPUT (8920A only)
,---ANALOG CIRCUITRY
INPUT
HI
+5V
SIGNAL
CONDITIONER
RMS
CONVERTER
+15V
INPUT
LO
,-
-15V
POWER
SUPPLY
I
I
_J
DIGITAL CIRCUITRY
I
I
- ----=---=--.~
----- ---
DISPLAY
L-----
-~-----
..,
I
I
________ J
CONTROLLER .....---t
AID
CONVERTER
Figure 3-1. Overall Block Diagram
3-1
8920A/8921A
signals are capacitively coupled; when the AC+DC
position is selected the input signal is de, or directly
coupled. This feature contributes to the measurement
accuracy when de components are present in the input
signal.
3-8. The Signal Conditioner insures that the varying
levels on instrument's input voltages are properly scaled
before being applied to the RMS Converter. The RMS
Converter works on a thermal sensing principle.
Basically, it operates by balancing the heating power of a
de feedback signal to the heating power of the ac input
signal. When the two are equal, the circuit is in
equilibrium and the de output voltage applied to the A/ D
Converter is directly representative of the true rms value
of the ac input signal. The de output of the RMS
Converter is also applied to the LINEAR ANALOG
OUTPUT terminals on the rear panel of the 8920A, as
well as the analog meter on the front panel of the 8920A
and 8921A.
3-9. The last analog circuit we discuss in this section is
the Power Supply. This circuit provides three regulated
power supplies (+5V, + 15V and -15V) to operate the
instrument.
3-10.
Digital Circuitry
3-1 I. The digital circuitry comprises the A/ D
Converter, the Controller and the Display. Together
these circuits develop a digital representation of the rms
value of the input signal, produce the commands that set
the range and function of the instrument and finally
display the input value.
3-12. The de output of the RMS Converter is translated
to a digital representation by the A/ D Converter. The
digital representation is then processed by the controller
to obtain a BCD output which is proportional to the
desired display mode (VOLTS, dB, dBm, REL). The
BCD output is decoded and applied to the display for
visual inspection.
3-13.
DETAILED BLOCK DIAGRAM
DESCRIPTION
3-14. In the following paragraphs we discuss, in detail,
the individual functions within the major areas of
circuitry in the 8920A and 8921A. Each major circuit area
is described in detail in Figure 3-2. The following
paragraphs describe the functioning of these subordinate
areas. The description for each circuit is keyed to its own
functional block diagram, or to the schematics in
Section 8.
3-15.
Signal Conditioner
3-16. The Signal Conditioner utilizes an Input
Attenuator, two amplifiers (Amp A and B) and the
3-2
Intermediate Attenuator. As shown in Figure 3-3, these
circuits are used to scale the varying voltage levels applied
to the instrument so that the input to the RMS Converter
is always between 0.09V rms and l V rms. The diagram in
Figure 3-3, illustrates the configuration of the circuitry
within the Signal Conditioner. The Controller, through a
range decoder network, issues commands which select
the appropriate division factor in the attenuators and the
correct multiplication factor for Amplifier A. Table 3-1,
lists each operating range and the corresponding division
and multiplication factors for the attenuators and
amplifier (note that Amplifier B has a fixed gain ofxl I).
The last column lists the components FETs and relays,
that conduct to establish gain configuration of the
circuits (see the schematics for details on components).
3-17.
RMS Converter
3-18. The 8920A and 8921A use a thermal rms
converter circuit which supplies a de output voltage
proportional to therms value of the ac input. The thermal
sensor is a pair of resistor-transistor elements thermally
isolated from each other and the case (see Figure 3-4).
The ac input signal (Vac from Amp B) produces a
temperature change in the RMS Sensor's input resistor
which is sensed by the associated transistor and causes a
voltage change at the negative input of the Integrator.
Feedback, through the Square Root Amplifier, provides
a de voltage to the RMS Sensor's output resistor such
that a similar temperature rise occurs in the output
resistor. The sensor gain is not constant with changes in
input amplitude. These changes in gain are compensated
for by the square root amplifier, maintaining constant
response time with changes in level.
3-19. The rms sensor is susceptible to damage from
overvoltage inputs. During an overload condition, the
protection circuit will clamp the output of Amplifier B to
prevent damage to the sensor. Overload conditions
would result during turn on, turn off, or any time therms
value of the applied input exceeds the operating range of
the sensor.
3-20.
A/D Converter
3-21. A dual-slope integration technique is used in the
Model 8920A/8921A A/D Converter. This method
applies the unknown voltage to a capacitor and allows
the capacitor to charge for a specific time interval. At the
end of this interval, the unknown voltage will be
removed. (The charge on the capacitor at this time will be
proportional to the level of the unknown voltage.) Then a
known voltage of opposite polarity is applied to the
capacitor and clock pulses are counted while the
capacitor discharges. When the capacitor has reached its
original charge point, the number of clock pulses counted
is a digital construction of the analog voltage input to the
A/D Converter.
----,
IS1GNAL CONDITIONER
8920A
{
BNCONLY
13
IN-HI
AC+ DC
.,,
ce·
c:
8921A
BANANA
JACKS
>--+
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c
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CD
INTERMEDIATE
ATTENUATOR
71, 710
INPUT
ATTEN~ATOR
71.1,7111,
711000
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IN-LO
w
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X5, X50
L_
RANGE
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INFORMATION!
CD
a.
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+5V +15V-15V
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ciii"
CCI
iil
3
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INPUT POWER
115/220V
50- 400 Hz
POWER
SUPPLY
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ILDISPLAY &
DECODER
-,I
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...
I I I
STROBE
DRIVERS
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.,
•
ANNUNCIATO~
_
•
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1b
DATA
OUTPUT
OPTION
.
t..:9NTROLLER_
I
RMS SENSOR
I
I
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RMS
I I
I I
I I
•
CONTROLLER
~
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_J
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I I
AUTO RANGE
ENCODING
I I
ANN UNCIA TORS
I I
I I PROTECTION
J L
RANGE iNFoRMATioN- I
I
CLOCK
----,
~MS CONVERTER -
I I
x 11
FEEDBACK
NETWORK
FEEDBACK
NETWORK
RANGE
INFORMATION
1V RMS
FULL-SCALE
OUTPUT
1. : :
DE
CM
I
I
I
A/D
:· CONVERTER
AZ
11
I I
I I
__J
----,
REFERENCE
INPUT
INT
-
_ _ _J
AUTO ZERO
~D CONVERTER _ _
I
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FRONT PANEL
SWITCHES
())
co
I\:)
0
)>
05
(,)
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(,)
co
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.....
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8920A/8921 A
- --,
r
UNKNOWN
INPUT
180 uV TO
700V AC
I
INPUT
ATTENUATOR
-=-1.1, 110 or 11000
+
INTERMEDIATE
ATTENUATOR
11V RMS
+
FULL SCALE
>-----RMS
SENSOR
X5 or 50
FIXED
AT Xl 1
I
I
I
RANGE COMMANDS
I
SIGNAL CONDITIONER_J
--------
L--RANGE
DECODER
FRONT PANEL ---1~ CONTROLLER
STEP COMMAND
Figure 3-3. Signal Conditioner
Table 3-1. Signal Conditioner Gain Configuration
INPUT
ATTENUATOR
RANGE
AMPA
*CONDUCTING
COMPONENTS
2 mV
-=-1.1
X50
-=-1
Kl,06,028,030,032
20mV
-=-1.1
X5
-;-1
Kl, 06, 029, 032
200mV
-=-1.1
X5
-=-10
Kl, 06, 029, 031
2V
-=-110
X5
-=-1
K2,03,05,029,032
20V
-=-110
X5
-=-10
K2, 03, 05, 029, 031
200V
-=-11,000
X5
-=-1
K2,04,05,029,032
-=-11.000
X5
-=-10
K2, 04, 05, 029, 031
700V
* Refer to the schematics in Section 8.
I
3-4
INTERMEDIATE
ATTENUATOR
I
I
8920A/8921 A
+15V +15V
INTEGRATOR
L-~
_J
1V RMS
FULL SCALE
1 ~INPUT FROM
E.
~ AMP~A
E0
AMP B
IFEEDBACK
i
1V de
FULL SCALE
OUTPUT
TO A/D
CONVERTER
NETWORK
~
1 GAIN
--15V
Figure 3-4. RMS Converter
3-22. For the following discussion refer to Figure 3-5,
the A/ D Converter Simplified Schematic and Timing
Diagram and Figure 3-6, Controller Timing (A/D
Converter).
Display and Annunciators will be described immediately
after this section on the Controller. A summarized
description of each input and output pin used on the
Controller is give in Table 3-2 and shown in Figure 3-7.
3-23. At the beginning of the measurement cycle, INT
goes high and the de output of therms sensor is applied to
the A/ D integrator for 100 msec. C203 charges up from
the auto zero level at a rate proportional to the applied
input voltage and the comparator's output, CM, is driven
low. At the end of the 100 msec integrate period, DE(-)
goes high applying the reference voltage to the integrator.
The integrator then discharges at a rate which is constant
for all on scale inputs and the controller begins counting
clock pulses. When C203 has discharged to the auto zero
level, CM will go high, the controller will stop counting
and the reading is displayed. AZI then begins, allowing
the A/ D Converter circuitry to settle before the next read
cycle. If CM has not occurred before the end of the 200
msec maximum DE (-) period, the input will have
exceeded the present range. In this case, the DE period
will continue until either CM or the end of the 100 msec
AZ! occurs.
3-26.
3-24.
Controller
3-25. The Controller is a custom LSI that controls
autoranging, the A/ D Converter and the Display and
Annunciators. In addition, the Controller can count in a
non- linear (dB) scale and display its count in dB units.
The A/ D Converter has already been described and the
AUTORANGING
3-27. Autoranging is the automatic selection of the
instrument's range by the Controller. With the low range
enabled, the instrument may range through seven voltage
ranges from 2 m V to 700V rms. Autoranging also applies
in the dB modes but gives the effect of a single range
spanning 132 dB. By coding the logic levels on the three
lines. FO, FI, and F2, the Controller selects a range (see
Table 3-3, Output Range Codes) by setting up the circuit
conditions of the input and intermediate attenuators and
amplifier A that are necessary for signal conditioning in
that range. (See Table 3-1, Signal Conditioner Gain
Configuration.) If the Controller senses that the input is
above or below the selected range (see Table 3-4,
Over/Underload Conditions), it shifts up or down one
range (depending upon the direction sensed) and halves
its cycle time. The Controller blanks the display and
checks if the input to the instrument is now in range or if a
further change in range is necessary. When the proper
range is found, display blanking is removed and the cycle
time returns to normal. Use of the HOLD RA;../GE
control will l:ommand the Controller to remain at the
present range (see Table 3-5, Input Range Code~) via
command input line D, E, and F. Use of the STF P UP
RANGE control will increment the instrument one
range.
3-5
8920A/8921A
INTEGRATOR
I COMPARATOR
RMS
CONVERTER
REF.
VOLTAGE
INT
INT
DE
AZ
CM
CONTROLLER
AUTO ZERO
PERIOD
INTEGRATE
PERIOD
INT--
100 mSEC
CLOCK I I I I I I .I I I I I
AZ
,....._ _ _ _ _ ____.
c:~-~-----+-. . .
DE------__..,
CM
I
------,~-----+----------'
I
.....--+-----+-----~
DE----------1
CM
I
----,~----....----------------'!
I
DE-------CM---.
0
200 mSEC MAX
I
--COUNTS---
Figure 3-5. A/D Converter, Simplified Schematic and Timing
3-6
8920A/8921 A
------A------.
200 ms
EXTENDED
OVERLOAD (OL)
AUTO - ZERO
100 ms
INTEGRATE
1 0
0 9
0 9
0 9
09
OL ONLY
10000
19999
D1,
55 us
B
200 us DE
(REFERENCE)
100 ms
AUTO ZERO
OR
AZ 1
CM
Figure 3-6. Controller Timing (A/D Converter)
Table 3-2. Controller Summary
INPUT/
OUTPUT
PIN DESCRIPTION
PIN #
PIN NAME
Input
1.
Vss
+5V supply
Input
2.
CM
Compare signal from A/D Converter.
Input
3.
CL1
External Oscillator input.
Input
4.
CL2
400 kHz crystal input for internal oscillator.
Output
5.
AG
Negative going pulse in the middle of each strobe. Insures
strobed data for DOU is valid.
Output
6-10,
ST0-ST7
Eight strobes that indicate which LED is to be enabled and
accept the data on lines W, X, Y and Z.
12-14.
Input
11.
RD
Impedance reference selection line, in dB.
Output
15-17.
Fo-F2
Encoded range lines, Fo = MSB, F2 = LSB, code equals range
#+ 1, voltage swings from; -15 to OV.
Input
18.
{j
Strobe input on this pin determines the lower range limit.
Input
19.
a
Strobe input on this pin determines the upper range limit.
Output
20.
DP
Enables display decimal point.
Input
21.
vDD
Ground, OV supply.
3-7
8920A/8921A
Table 3-2. Controller Summary (cont)
INPUT/
OUTPUT
PIN #
Output
22.
BZ
Indicates new data is ready for DOU, occurs after CM, one
strobe raster long.
Input
23-25.
F, E& D
Enables controller ranging, see Table 3-5.
Output
26-29.
BCD data, W = MSB, Z = LSB, TTL compatible.
Output
30.
W,X, Y&Z
-BLK
Input
31.
K
700V range overload enable.
Input
32.
VGG
-15V supply.
PIN DESCRIPTION
PIN NAME
Drives blanking input on display decoder driver, TTL compatible.
-
Input
33.
J
Input
34.
T1
Test (not used).
Input
35.
dB
Enables dB display mode.
Output
36.
INT
Enables not integrate period of A/D Converter.
Output
37.
INT
Enables integrate period of A/D Converter.
Output
38.
AZ
Enables auto zero period of A/D Converter.
Output
39.
DE (-R)
Enables integrate reference period for positive input of
A/D Converter.
Output
40.
DE (+R)
Enables integrate reference period for negative input of
A/D Converter (not used).
Q..fQLTS
0
LINEAR
0
dB
Enables 3% or 4% digit display in linear mode and determines (in
combination with RD) the fixed reference in dB mode.
NON LINEAR
JlJUL_jL_
~-------------,
JUUl I
RM
12000
I
MAIN
COUNTER
I
INT
I
INT
AZ4--~DE(+R)4--_.__
DATA
LATCHES
A/D
CONTROL
I
I
I
I
I
DE ( - R ) - - - - - t
~~__.
CM-+---_.
REFERENCE
LATCHES
RE~
~~
I
I
~~~~....---.--~--''
I
I
•,
!
! ,:·~~g~
L\
.:tE~:y I'"0" I (C
---1--------'
y
j
FRONT PANEL COMMANDS
D,E & F
Figure 3-7. Controller Functions
3-8
+5V
CM
CL{ XTAL 1
XTAL2
RG
STO
ST1
ST2
ST3
ST4
RD
ST5
ST6
ST7
Fo
F1
F2
~
a
DP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
8920 LSI
DE(+R)
DE(-R)
AZ
INT
INT
dB
j1
-15V
K
BLK
z
y
x
w
D
E
F
BZ
GNDOV
8920A/8921A
3-29.
Table 3-3. Output Range Codes
DATA LINES
RANGE
Fo
F1
F2
2mV
0
0
1
20mV
0
1
0
200mV
0
1
1
2V
1
0
0
20V
1
0
1
200V
1
1
0
700V
1
1
1
Table 3-4. Over/Underload Conditions
LINEAR
dB*
Overload:
>1999 J3
25.30 (20V range)
except for 700
700V range:
>700a
56.10
Underload:
<180
4.30 (20V range)
132
1.60 (20V range)
minimum input
for accurate dB
conversion
3-30. The Controller is able to count (compute) in two
modes, linear or non-linear. The following paragraphs
will explain how the Controller obtains its linear (volts)
or non-linear (dB) readings.
3-31.
Table 3-5. Input Range Codes
COMMAND LIN ES
8920 CONTROLLER
FUNCTION
D
E
F
0
0
1
Auto range fast range cycle
1
0
0
Hold present range (overridden
by a & 131
1
1
0
Range up at CM time (overridden a & J3 )
3-28. The 2 mV range will not be selected by
autoranging unless the LO RANGE ENABLE switch is
selected. If the low range is enabled and the instrument
enters the 2 mV range, the 2 MHz MAX annunciator will
illuminate to remind the user of instrument limitations.
VOLTAGE COMPUTATIONS
3-32. To make a voltage measurement the Controller
must linearly count clock pulses for a time determined by
the A/ D Converter. Referring to Figure 3-7, you can see
that when the dB/VOLTS switch is placed in its up (out)
position the rate multiplier (RM) will be shunted and the
main counter will count the number of clock pulses
exactly as they occur (linear). As soon as the integrator in
the A/ D Converter reaches the auto-zero point, CM will
go high, commanding the main counter to stop counting
and simultaneously shifting its count to the data latches.
What is now held in the data latches is a count of clock
pulses, in bed format, that is proportional to the true rms
value of the signal being measured. The bed data is then
shifted out of the controller, to a seven-segment decoder
on four lines: W, X, Y and Z.
3-33.
*dB calculations are based on a 1200 ohm reference
impedance and 20V range. The calculation is then
corrected for the proper range and the selected
impedance by the addition of the appropriate
constant, which may be calculated from the
following equation:
20 log v'1.2-20 log v'o.001 R + N (20).
Where N = number of ranges above or below the
20V range, i.e., 2 mV range N = X4
COMPUTATIONS
dB COMPUTATIONS
3-34. If the dB/VOLTS switch is in the dB position, a
non-linear count of the clock pulses is enabled. The
binary rate multiplier (RM) passes only a fraction of the
clock pulses on to the Controller's main counter (see the
illustrated input to the main counter on Figure 3-7). This
count approximates the logarithmic curve of the dB scale
and, like the VOLTS mode, is stored in the data latches.
3-35.
dBm REFERENCE
3-36. Don't let the m confuse you, it simply means that
the power level, as measured in "dB Computations", is
referenced to 1 mW. In other words, when the instrument
reads 0 dB the system being measured will be dissipating 1
mW of power. The following will explain how the
controller obtains a measurement of power referenced to
1 mW (dBm).
3-37. In order for the controller to obtain a
measurement in dBm parameters, the appropriate
reference impedance must be used. A 1200ohmreference
impedance is assumed by the RM. Therefore, if any other
reference is desired an appropriate constant must be
added or subtracted from the count. The dBm
REFERENCE rotary switch connects one of the eight
strobes to RD and J. The controller responds by sending
the appropriate constant to its ADD/SUB.
3-38. Referring to Figure 3-7, let's assume that a 600
ohm reference impedance is selected and the instrument
had previously made a relative measurement. Strobe zero
3-9
8920A/8921A
reference impedance. Therefore, before the REL mode
can be selected the controller must be allowed to make at
least one complete measurement while in the dBm mode.
Once the measurement has been completed the REL
mode may be selected. The reading will now be fed back
to the reference latches and held. The controller will
subtract the reading in the reference latches from all
subsequent readings. Note that if the instrument is
ranged up/ down, 20 dB will be added to or subtracted
from the reading held in the reference latches. The
reading held in the reference latches, however, will be lost
any time the instrument is turned off or if the REL switch
is released.
will be applied to RD until the REL/dBm switch is
placed in its dBm position. At this time strobe 4
(corresponding to 600 ohms) is applied to RD and causes
the controller to select the 600 ohm reference impedance
data. This data along with the range and polarity data is
then shifted to the ADD/SUB where it is combined with
the count referenced to 1200 ohms. The resultant value is
now equivalent to a dBm reading referenced to 600 ohms.
The range and polarity data is held in the reference
latches until RD or J detect a strobe change or unless the
instrument is turned off. (Switching to the VOLTS mode
will not cause the data in the reference latches to be lost.)
3-42.
RELATIVE (REL) REFERENCE
3-39.
Display and Annunciators
3-43. The computed value of the input to the
instrument is transmitted serially as four-bit BCD
characters on the W, X, Y, and Z data lines from the
Controller to the Seven Segment Decoder see Figure 3-8,
Display and Annunciators. The output of the Seven
Segment Decoder drives the Display Data Bus, which is
commPn to the inputs of all five of the Display LEDs.
Strobe pulses from the Controller determine which
Display LED is enabled to accept the data on the Display
Data Bus. ST4 through ST7 strobes the seven segment
LEDs from LSD to MSD respectively. STO gates the ±1
digit. If the volts display mode is selected, 3 and 1/2 digits
will be enabled, resulting in a resolution of0.05%. If the
dB display mode is selected 4 and 1/2 digits will be
3-40. Relative reference measurements allow any
voltage input to become the 0 dB point to which all
subsequent voltage inputs are referenced. The controller
makes a relative reference computation much the same
way it made a dBm computation. However, in the REL
mode, 0 dB no longer refers exclusively to I mW. The
following explains how the controller makes a relative
reference measurement.
3-41. Referring the Figure 3-7. you can see that upon
selection of the REL mode, the reference impedance data
line will be disabled. However, to make a relative
reference measurement the controller must use an initial
reading, and to obtain an initial reading it must use a
8920A CONTROLLER
DP
STO
ST6
ST7
ST5
ST4
dB/LIN
!
I
BUFFERS
-,I
,-, 1•/,-, ,-, -·l,-,
,
I
I
'
I
I 1•/ I
J
I
11
1-
J
I
I ~./-/
J
11
i-
-
--
11
1-
-
I
RANGE
CONTROL
RD,J D,E,F,a,/l STO-ST7
w
x y z
fl fl .lJ.
'
'
----
REF
CONTROL
-
'
I
I
11
1-
FRONT PANEL
COMMANDS
CD
(')
0
0
(RANGE, REF, REL,
dBM, 2mV ENABLE)
)>
-I
+++++
)>
!::
~
Ul
ANNUNCIATORS
V, mV, dB, 2mHZ,
REL
,,,
~
-
-~
--
A
'' , ' ,
B
c
D
E
SEVEN
SEGMENT
DECODER
F
G
t
Figure 3-8. Display and Annunciators
3-10
BLK
8920A/8921 A
enabled and the resolution will be 0.01 dB. The decimal
point is enabled separately by the DP line from the
Controller.
3-44. The annunciators, excepting the 2 MHz MAX,
are strobed on by STO. STO is routed through two
circuits. One path is completed when the dB/VOLTS
switch is in the dB position. The dB annunciator DS309 is
enabled. If the REL/ dBm control is in the REL position,
RELATIVE REFERENCE annunciator DS308 will also
be enabled. If the dB/ VOL TS control is in the VOLTS
position, STO is routed through another path and either
the V annunciator DS307 or the m V annunciator DS306
is enabled depending upon the present range of the
instrument. If the LO RANGE ENABLE control has the
2 m V range enabled and the instrument is in the 2 m V
range, the 2 MHz MAX annunciator will be illuminated
to remind the user of the 2 MHz input range of the
instrument.
3-45.
Power Supply
3-46. The power supply section on the Main PCB
provides the instrument with operating voltages and logic
levels of +15V, -15V, and +5V.
3-47. Line voltage (IOOV, 120V, 220V or 240V as
selected by controls S209 and S210) is connected to the
primary of the main power transformer T2QO via
POWER switch S208 and fuse Fl. The secondary of
T200 contains two windings. One winding drives the +5V
power supply, the other drives the ±15V power supply.
3-48. In the +5V power supply, power from the
secondary winding is full wave rectified by CR205,
filtered by C211, and regulated by VR203.
3-49. In the ±15V power supply, power from the
secondary winding is full wave rectified by CR204,
filtered by C209 and C210, and regulated into + l 5V by
VR202. The -15V is regulated by 0211 and Q207.
3-11/3-12
8920A/8921 A
Section 4
Maintenance
WARNING
THESE SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED PERSONNEL
ONLY. TO AVOID ELECTRIC SHOCK, DO NOT PERFORM ANY SERVICING OTHER
THAN THAT CONTAINED IN THE OPERATING INSTRUCTIONS UNLESS YOU ARE
QUALIFIED TO DO SO.
4-1.
1. Disconnect the instrument from the line power
and remove its top cover (four screws on the bottom
of the unit hold the top cover in place).
INTRODUCTION
4-2. This section of the manual contains information on
service, general maintenance, performance tests,
calibration, and troubleshooting. The performance test is
recommended as a preventive maintenance tool, and
should be executed when it is necessary to verify proper
instrument operation. A calibration interval of 90 days is
recommended to insure that the 8920A and 8921A
perform within the specifications stated in Section I.
4-3. Table 4-1 lists the recommended test equipment
necessary to maintain both instruments. If the specified
equipment is not available, other equipment having
equivalent specifications may be used.
4-4.
4-5.
GENERAL MAINTENANCE
Access Information
4-ti. T'1 rain access to the interior of the instrument,
remove the four #6-32 phillips screws located on the
bottom of the case. This loosens the top and bottom,
allowing the top cover to be removed.
4-7.
INPUT POWER SELECTION
4-8. The 8920A and 8921A may be operated from any
one of the line voltages shown in Table 4-2. Use the
following procedure to condition the instrument for use
with the local line power.
2. Locate the power selection switches S209 and
S2IO as shJwn in Figure 4-5.
3. Refer to Table 4-2 and set switches S209 and
S2IO for desired line voltage.
4. Install the top cover before connecting the unit
to line power.
4-9.
Cleaning
4-10. Clean the front panel and case with denatured
alcohol or a mild solution of detergent and water. Clean
dust from the interior of the instrument with dry, low
pressure air (20 psi). Contaminants can be washed from
the circuit board with demineralized water and a soft
brush (avoid getting excessive amounts of water on the
switches).
CAUTION
Do not use aromatic hydrocarbons or
chlorinated solvents for cleaning. These
solutions will react with the plastic materials
of the instrument.
4-1
8920A/8921 A
Table 4-1. Recommended Test Equipment
REQUIREMENT
RECOMMENDED
EQUIPMENT
Precision AC Calibrator and
Power Amplifier
19 mV to 600V
20 Hz-50 Hz, ±0.2%
50 Hz-50 kHz, ±0.1 %
John Fluke 5200A
&
John Fluke 5205A
DC Voltage Calibrator
±0.5% ±3µV
(AC Component< 100 µV)
John Fluke 341A
Leveled Generator
Short term stability, drift
and adjustment resolution <.1%
Freq. range 50 kHz-20 MHz or
greater.
Tektronix SG-503/
Series 500 Mainframe
DVM
3Y2 digits, 0.25% Resolution
JF-8020A
Flat Attenuator, 20 dB
(three required)
Flatness
50 kHz-1 MHz, ±0.1%
50 kHz-10 MHz, ±0.5%
50 kHz-20 MHz, ±0.7%
1V Transfer Standard
50 kHz-20 MHz,±0.1%
JF-A55 1 V
GR Tee
Adapter
Adapter
Adapter
Adapter (8921 only)
874
874-BNC (2 required)
874-BNC
Banana-BNC
BNC-Banana
GR, 874-TL
GR, 874-0BPAL
GR, 874-QBJAL
Pomona 1296
Pomona 1259
Feed thru 50il
Termination
1 GHz rated
TEK, 011-0049-01
EQUIPMENT
NOMENCLATURE
GR, 874-G20L
Table 4-2. Input Power Selection
SWITCH POSITION
(REAR PANEL)
-S209
IBI
IHI
1!11
4-2
-
SELECTED LINE SOURCE
ac ±10%, 10 WATTS MAX
S210
~
120V, 50-400 Hz
g
100V, 50-400 Hz
IHI
220V, 50-400 Hz
~
240V, 50-400 H;z
(250V, MAX)
-
8920A/8921 A
4-11.
Fuse Replacement
NOTE
4-12. The 8920A and 8921A have one replaceable fuse
located on the rear panel which may be replaced with a
Buss I/ 8 amp, slo blo fuse.
4-13.
PERFORMANCE CHECK
NOTE
Jn the fallowing procedures the instrument
(8920A or 8921 A) which is being either
checked or calibrated is referred to as the
UUT (Unit Under Test).
Jn all of" the procedures in this section,
precautions should be taken to minimize
ground currents, stray fields, etc.
4-15.
4-16. This procedure will verify that the UUT's low and
midband performance is within the limits specified in
Section l. Set up the test equipment as shown in Figure 41, and select the required function and input signal as
indicated in Table 4-3. Note any deviation between the
UUT performance and the specified limits.
4-17.
4-14. The performance check provides a means of
verifying the overall operation of the U UT. This
procedure can be used as an acceptance test for receiving
inspection and as a periodic maintenance check. Refer to
Table 4-1 for the test equipment recommended for these
checks. Should the UUT fail to meet the requirements of
these checks, calibration and/or troubleshooting will be
necessary. Before starting the performance checks, allow
the UUT and the required test equipment to warm-up for
at least 30 minutes in an environment of 23 ±5°C with
relative humidity less than 80%.
Low and Midband Performance Check
(Volts Display Mode)
dB Display Mode Check
4-18. This procedure will verify that the U UT's dB
display mode is functioning properly. Set up the test
equipment as shown in Figure 4-1. Depress RANGE
HOLD and step up to the 2V range. Select the l V range
on the AC Calibrator and adjust its output for 1.000 on
th~ U UT's display. Select the dB display mode and switch
through the dBm REFERENCE selection switch,
checking the reading at each position against Table 4-4.
The readings should not differ by more than ±1 digit
from the numbers given in Table 4-4.
LINEAR
ANALOG
OUTPUT
DVM
(8600A)
SHIELDED
CABLE
POWER AMP
(5205)
\
8920A/8921 A
(FRONT)
NOTE:
WHEN TESTING THE 8920A A BANANA TO
BNC ADAPTER MUST BE USED (POMONA 1296)
Figure 4-1. Low and Midband Performance Test Set-Up
4-3
8920A/8921 A
Table 4-3. Low and Midband Performance Check (Volts Display Mode)
AC,
AUTO RANGE
2mV
1.9 mV
500
1.000
LIMITS
or
COUNTS
±38
AC,
AUTO RANGE
20mV
10mV
500
10.00
±10
De-energize the LO RANGE
ENABLE and note that the
mV annunciator is lit.
AC,
AUTO RANGE
200mV
100 mV
500
100.0
±5
Note that the mV annunciator remains lit.
AC, HOLD
2V
3V
500
1.999
n/a
Verify that display flashes
1.999 signifying overrange.
AC, HOLD
2V
1V
500
n/a
±,01V
Measure 1Von the linear
analog output (8920A only).
Note that the test instrument's reading is within
±.01 V of UUT's displayed
reading.
AC, HOLD
2V
.2V
500
n/a
±.002V
Measure 0.2V on linear
analog output (8920A only).
Note that the test instrument's reading is within
±.002V of UUT's displayed
reading.
AC, HOLD
2V
.17V
500
.17
n/a
Verify that decimal flashes
signifying below 9% of
range.
AC,
AUTO RANGE
2V
1V
500
1.000
±5
Note that the V annunciator
is lit.
AC,
AUTO RANGE
20V
10V
500
10.00
±5
Note that the V annunciator
remains lit.
AC,
AUTO RANGE
200V
100V
500
100.0
±5
Note that the V annunciator
remains lit.
AC,
AUTO RANGE
20mV
10 mV
50K
10.00
±10
Note that the UUT autoranges down to the 20 mV
range.
AC,
AUTO RANGE
200 mV
100 mV
50K
100.0
±5
AC,
AUTO RANGE
2V
1V
50K
1.000
±5
FUNCTION
MODE
4-4
INPUT
RANGE
LEVEL
DISPLAY
F(Hz)
COMMENTS
Select the LO RANGE
ENABLE and note that
the mV and 2 MHz max
annunciators are lit.
8920A/8921 A
Table 4-3. Low and Midband Performance Check (Volts Display Mode) (cont)
FUNCTION
MODE
INPUT
RANGE
DISPLAY
LEVEL
F(Hz)
LIMITS
or
COUNTS
AC,
AUTO RANGE
20V
10V
50K
10.00
±5
AC,
AUTO RANGE
200V
100V
50K
100.0
±5
AC,
AUTO RANGE
700V
600V
500
600
±3
4-19.
DC Low Level Check
4-20. This procedure will verify correct operation with
low level DC inputs. Set up the test equipment as shown
in Figure 4-2, and select the required function, range and
input signal as indicated in Table 4-5. Note any deviation
between the display of the UUT and the specified limits.
4-21.
AC Low Level Check
4-22. This procedure will verify that the UUT's low
level AC performance meets the specifications of Section
1. Set up the test equipment as shown in Figure 4-3 and
complete the AC Low Level Calibration procedure.
Replace steps 2-d and 2-e with the following:
2-d. Note that the UUT's display reads the
same error as noted in step 1-f ±38 digits.
2-e Note that the UUT's display reads 0.1900
±4 digits.
4-23.
High Frequency Response Check
4-24. This procedure will verify that the UUT's high
frequency response meets the specifications of Section 1.
Set up the test equipment as shown in Figure 4-4, and
select the required input amplitude and frequency as
indicated in Table 4-6. Note any discrepancies between
the display reading and the limits given.
4-25.
CALIBRATION
4-26. Under normal conditions the 8920A and 8921A
should be calibrated every 90 days to maintain the
specification given in Section 1 of this manual. If
instrument repairs have been made or if the unit fails any
of the performance checks, calibration is required. Use
the test equipment as listed in Table 4-1.
4-27. Use the following procedures to calibrate the
8920A or 8921A. Access to all calibration and test points
COMMENTS
Use the 5205A for this
test.
(see Figure 4-5) may be obtained by removing the top
cover (see Access and Removal). The UUT should be
allowed to warm-up for 30 minutes before calibration.
4-28.
Power Supply Calibration
WARNING
IN ALL PROCEDURES WITH THE TOP
COVER REMOVED THE OPERATOR
SHOULD BE AWARE THAT THE FOLLOWING POINTS ARE AT LINE POTENTIAL:
1. POWER LINE CONNECTOR.
2. ALL LAND PATTERNS NEAR POWER
TRANSFORMER.
3. POWER SWITCH.
4. FUSE HOLDER.
4-29. Use the following procedure to calibrate the
power supplies of the UUT.
1. Place all front panel switches to the out
position.
CAUTION
Certain overload protection depends on the
supply voltages. To avoid possibility of
damage, do not adjust the ±1 SV supplies with
the UUT in overrange.
2. Monitor TP206, with a DVM using TP205 as a
voltmeter common.
3.
Adjust R229 for +15V ±0.lV on TP206.
4.
Check TP208 for -15V ±0.2V.
5. If TP208 does not comply, recheck TP206 and
adjust R229 if necessary.
6.
Check TP207 for +5V ±0.25V.
4-5
8920A/8921 A
Table 4-4. dB Display Mode Check
MODE
dBm
REFERENCE
OHM
DISPLAY
READING
SOURCE
50
1.000
+13.00
COMMENTS
Note that the dB annunciator is lit.
1?,.01
dBm
75
1.000
dBm
93
1.000
+11.24
\ \ '2.6
+10.31
dBm
110
1.000
+9.58
dBm
124
1.000
+9.06
0•0(J51
dBm
135
1.000
+8.69
dBm
150
1.000
+8.23
dBm
300
1.000
+5.22
dBm
600
1.000
+2.21
dBm
900
1.000
dBm
1000
+ .45
C::> - q. S7S
- .01
1¢•3\$1
~·4{8(..
~ .. {.%b
~:· ;2.~ '1
:,:2;)i'l-
'2, ), 4
1.000
0
~
dBm
1200
1.000
- .80
- 0
~?qi
REL
1.000
+0.00
Note that the dB and REL annunciators
are lit.
REL
10.00
+20.00
Step up to the 20V range (note that the
dB and REL annunciators remain lit).
SHIELDED
CABLE
l>
8920A/8921 A
Figure 4-2. DC Low Level Check Test Set-Up
4-6
8920A/8921 A
Table 4-5. DC Low Level Check
DC INPUT
RANGE
FUNCTION
UUTDISPLAY
±&COUNTS
COMMENT
1V
2V
AC+DC
1 .000 ±30 counts
UUT de circuitry functioning.
2mV
AUTO
(depress LO
RANGE
ENABLE)
AC+DC
02.00 or mVrms
(see comment)
±6 counts
The ac input component should be
less than 0.2 mV. The mVac component
can be measured by temporarily selecting
the AC and LO RANGE ENABLE switches.
If it is greater than 0.2 mV;
mVrms = V(2 mVdc) 2 + (mVac) 2
BNCTO
BANANA
ADAPTER
SG-503
87420dB
son
87420dB
TERM
ATTENUATOR
OUTPUT
SHIELDED
CABLE
8920A/8921 A
Figure 4-3. AC Low Level Check Test Set-Up
[!::>
BNCTO
BANANA
ADAPTER
SG-503
0
0
SG-503
PRECISION
CABLE
2
8920A/8921 A
[!::::>- NOTE:
TERMINATION MUST BE CONNECTED AS CLOSE
AS POSSIBLE TO 8920A or 8921A INPUT
Figure 4-4. High Frequency Response Check Test Set-Up
4-7
8920A/8921 A
0
:::....
R224
TP206
R205
0
~B!215
~,_ -0 CR200
~
R214 ~
TP200
3-
TP204 Tp209 - - - - - ·
- ..
•.
~O~:::.o{J.."fd.o
ts
4
---'-;
"-
R210 -Q - R209V-
-::::;------.....:E:10~0E~2~(}-~TP
~
r
cR216_J 1 an
~D~
!
~-0
..,o
R
:t
~2 o.t.1, •1•
3
4S
D
-
f1l
~
R229
i
6
:t
, .~VO!
0
Qoo2°
Q202
8920A-1601
Figure 4-5. Calibration and Test Point Locations
4-8
8920A/8921 A
5
~J100
TP4
TP5
TP2
R43
R3
C9
R5
.-
...
...
"0 ~
P105@
8920A-1603
Figure 4-5. Calibration and Test Point Locations (contl
4-9
8920A/8921A
Table 4-6. High Frequency Response Check
FUNCTION
MODE
INPUT
RANGE
F(Hz)
AC,
AUTO RANGE
20mV
17 mV
50K
17.00
AC,
AUTO RANGE
20mV
17 mV
20M
17.00
AC,
AUTO RANGE
200mV
170 mV
50K
170.0
AC,
AUTO RANGE
200mV
170 mV
20M
170.0
AC,
AUTO RANGE
2V
1.7
50K
1.700
AC,
AUTO RANGE
2V
1.7
20M
1.700
4-30.
LIMITS
±COUNTS
DISPLAY
LEVEL
Low and Midband Accuracy
Adjustment
COMMENTS
Adjust the SG503 amplitude
so that the display reads 17.00.
±85
Readjust the input frequency
without changing the amplitude.
Adjust the SG503 amplitude so
the display reads 170.0.
±85
Readjust the input frequency
without changing the amplitude.
Adjust the SG503 amplitude so
the display reads 1. 700.
±85
Readjust the input frequency
without changing the amplitude.
(LAO). Adjust R224 for the same reading as the
display ±2 mV.
4-31. Use the following procedure to calibrate the low
and midband accuracy of the UUT.
4. Observe that the null/peak meter reads center
of scale ± 1/ 2 division.
1. Place all the front panel switches in the out
position, except LO RANGE ENABLE.
5. Push RANGE HOLD and decrease the input
to 0.1 V, 500 Hz. The output voltage should read the
same as the front panel display ±0.2mV. If it is not
within this limit, adjust R234 and go back to step 3.
2. Short TP204 to TP209 to light the 4th display
digit.
3. Apply the input voltages and frequencies as
listed in Table 4-7, and adjust to the limits given. If
any limit cannot be reached, see Troubleshooting,
Table 4-9.
4-32.
Linear Analog Output {8920A only)
4-33. Use the following procedure to calibrate the
8920A's Linear Analog Output.
I. Set up the calibration test equipment as shown
in Figure 4-6.
2.
Select AC and AUTORANGE.
3. Apply l.OOOV, 500 Hz to the input and monitor
the de voltage at the rear panel linear analog output
4-10
6. Increase the input to 0.5V. The voltage at the
output should be the same as the front panel display
±0.00lV.
4-34.
AC Low Level Calibration
4-35. Use the following procedure to calibrate the
UUTs AC low level performance.
1. Measure the 503 Attenuator Errors (leveled
generator).
1-a. Place all front panel switches out except
LO RANGE ENABLE.
1-b. Set up the test equipment as shown in
Figure 4-3.
8920A/8921 A
1-c. Set the leveled generator to 50 kHz, XI
and connect the 874-20 dB-GR attenuator input
to the input of the UUT.
2-b. Switch the leveled generator to the XI and
adjust the amplitude such that a steady reading
of I0.00 mV is obtained on the UUT.
1-d. Adjust the leveled generator amplitude
until a steady reading of I.OOOV is obtained on
the display of the U UT.
2-c. Switch the leveled generator to the X. l
setting allowing the UUT to range down to the 2
mV range.
1-e. Switch the leveled generator to the X. I
setting, observe that the UUT autoranges down
to the I00 m V range and note the reading error.
2-d. Adjust R44 so that the display of the UUT
reads the same error as noted in step 1-e, ±I
digit.
1-f. Switch the leveled generator to the X.01
setting and note that the reading error is less than
I 0 digits on the 20 m V range.
2.
2-e. Depress the
readjust the leveled
1.900 ±I digit and
setting. The UUT's
from 0.190 to 0.192
Calibrate the 2 m V range:
2-a. Connect the 50 ohm terminated
attenuator output to the input of the UUT.
RANGE HOLD switch,
generator for a reading of
switch down to the. X.01
display reading should be
after settling.
Table 4-7. Low and Midband Accuracy Adjustments
STEP
INPUT
v
RANGE
(AC)
FREQ
Hz
ADJUST
READ
DISPLAY
LIMIT
±of READING
500
-
Note reading.
n/a
500
R101
1/10 of reading
in step 3.
3 digits
n/a
R72
2.500
±10 digits
n/a
R26
.2500
±10 digits
500
R205
100.00
5 digits
500
R44
1.9000
40 digits
50K
C9
100.00
5 digits
2V
500
R3
1.0000
5 digits
2V
500
R224
Meter (8921 A
only).
Mid-scale
2V (AC)
1
1
1a
Select RANGE HOLD.
1b
0.1
1c
Return to step 1 if R101 was readjusted.
1d
Select AUTO RANGE.
2
2.5V de
20V (AC+DC)
2a
0.25 Vdc
2V (AC+DC)
3
Return to step 2 if R26 was readjusted.
4
100 mV
200 mV
5
1.9 mV
2mV
5c
Return to step 4 if R44 was readjusted.
6
100 mV
200mV
7
1
8
1
2V
4-11
8920A/8921A
Table 4-7. Low and Midband Accuracy Adjustments (cont)
RANGE
(AC)
FREQ
v
9
100
200V
10
1
11
100
11c
Return to step 10 if CB was readjusted.
12
10mV
20mV
13
10mV
14
ADJUST
READ
LIMIT
±of READING
500
R7
100.00
5 digits
2V
50K
C5
1.0000
5 digits
200V
50K
CB
100.00
10 digits
500
Chk
10.000
20 digits
20mV
10K
Chk
10.000
20 digits
10mV
20mV
50K
Chk
10.000
20 digits
15
10
20V
500
Chk
10.000
5 digits
16
10
20V
10K
Chk
10.000
20 digits
17
10
20V
50K
Chk
10.000
5 digits
1B
10
20V
20K
Chk
10.000
0 to -70 digits
19
Remove the short between TP204 and TP209.
20
Autorange into the 20 mV range and push RANGE HOLD.
21
Monitor the DC voltage on TP4 with a DVM and apply 20.6 mV, 500 Hz to the input.
22
Note the DVM reading.
23
Increase the input to 206 mV and check the DVM for a reading .07 + .02V or -.01V smaller than
the reading noted in the previous step. If the reading is outside these limits, refer to the calibration
procedure of therms sensor protection "RMS Protection Circuit Calibration".
STEP
INPUT
Hz
DVM
(B600A)
BANANA
TOBNC
ADAPTER
AC
CALIBRATOR
(5200A)
B920A
(REAR)
B920A(FRONT)
Figure 4-6. Linear Analog Output Test Set-Up (8920A only)
4-12
8920A/8921 A
4-38.
High Frequency Calibration
4-36.
RMS Protection Circuit Calibration
4-37. Use the following procedure to calibrate the
UUT's high frequency response.
CAUTION
R111 controls the protection circuit for the
RMS Sensor. DO NOT make any adjustments
to R111 other than those listed below.
Indiscriminate adjustments may cause
component damage.
I. For the ranges shown in Table 4-8, adjust the
amplitude of the leveled generator at 50 kHz to
establish a reference (refer to Figure 4-7, for the test
setup). Use one 20 dB attenuator for O.IV two
attenuators for 0.01 V, and three attenuators for
.001 V terminated with 50 ohms. Take care not to
overdrive the transfer standard.
4-39. Use the following procedure to calibrate the
protection circuit of the rms sensor. This procedure
should be completed only if the rms sensor or any
component in the protection circuit has been replaced or
if the limit in step 22 of Table 4-9 cannot be met.
2. Note the reading at the output of the A55
transfer standard and maintain this by readjusting
the generator's level for other frequencies.
Table 4-8. High Frequency Calibration
STEP
SOURCE
LEVEL
UUT
RANGE
SOURCE
FREQ.
ADJUST
UUT
DISPLAY
LIMIT
±COUNTS
1
.001
2mV
50K
source
1.000
±1
2
.001
2mV
2M
R43
1.000
±2
3
.001
2mV
*
Chk
1.013
±3
4
0.01
20mV
50K
source
10.00
±1
5
0.01
20mV
20M
C33
10.00
±3
6
0.01
20mV
10M
Chk
10.00
0 to +20
7
0.01
20mV
1M
Chk
10.00
±3
8
0.1
200 mV
50K
source
100.0
±1
9
0.1
200mV
20M
C58
100.0
±10
10
1.
1.
50K
source
1.000
±1
11
1.
1.
20M
R5
1.000
±1
12
1.
1.
10M
Chk
1.000
0 to +10
13
1.
1.
1M
Chk
1.000
±3
*Reduce the frequency to the point between 1 and 2 MHz where the maximum reading
on the display occurs. If too high, turn C13 clockwise a few turns. If it is too low, turn
C13 counterclockwise. Then return to step 1 of this table.
4-13
8920A/8921A
SET DVM TO
200 mV RANGE
DVM
(8600A)
A551V
TRANSFER
STANDARD
SG-503
TEE
874-20dB
ATT
[I:>BNCTO
BANANA
ADAPTER
0
874-20dB
ATT
0
~
SHIELDED
CABLE
8920A/8921 A
[]:::::>NOTE:
TERMINATION MUST BE CONNECTED AS CLOSE AS
POSSIBLE TO THE INPUT OF THE 8920A OR 8921A
Figure 4-7. High Frequency Calbration Test Set-Up
NOTE
The ambient temperature must be 23° C ±5° C
and the ±15 V supplies must be calibrated.
I. Remove the tape dot on RI I I and turn RI I I to
its Max CCW position.
2. Select AC, AUTORANGE then HOLD to lock
the UUT in the 20 m V range. Refer to Figure 4-5 for
the calibration and test point locations. Monitor
the voltage at TP4 with a DVM and apply 20.6 m V,
200 Hz to the input.
3. Turn RI I I slowly clockwise until the DVM
reading stops decreasing. Note the DVM reading
and turn RI I I back slightly CCW. Increase the
input to 25.6 mV and CAREFULLY adjust RI 11
clockwise for a reading on the DVM .07V ±.002
smaller than the noted reading. DO NOT ADJUST
FURTHER OR THE SENSOR MAY FAIL. Now
increase the input to 256 m V, 2 kHz. The voltage at
TP4 should not change by more than 20 mV.
4.
4-14
Replace the tape dot on RI I or use Glyptol.
4-40.
TROUBLESHOOTING
4-41. This section contains information selected to
assist in troubleshooting the Model 8920A/892IA.
Before attempting to troubleshoot the instrument,
however, it should be verified that the trouble is actually
in the instrument and is not caused by faulty external
equipment or improper control settings. For this reason,
the Performance Check is suggested as a first step in
troubleshooting. The Performance Check may also help
to localize the trouble to a particular section of the
instrument. If the Performance Check fails to localize the
trouble, the following information may be helpful.
Location of principal circuitry areas, test points and
adjustment locations in the Model 8920A/892IA is
shown in Figure 4-5.
4-42. When troubleshooting the UUT, the following
points should be kept in mind.
I. Before any troubleshooting is begun, make a
visual inspection of the interior of the instrument.
2. When troubleshooting the AC Amplifiers,
isolate the DVM test lead with a IO kn probe,
otherwise capacitive loading may cause the AC
Amplifiers to oscillate.
8920A/8921 A
3. MOS type integrated circuits can be damaged
by discharging static electricity through the device.
All circuits of this type are designated on the
schematic with this symbol ©.Use care and always
use a grounded soldering iron when removing or
installing MOS devices.
4-43. A troubleshooting guide forthe 8920A and 8921A
is presented in Table 4-9. This guide is in a tabular flow
chart form and is recommended for use in isolating a
problem to a functional circuit area. The initial steps in
the troubleshooting guide refer to the Performance
Checks made earlier in this section.
4-44.
RMS Sensor Replacement
4-4S. Use the following procedure when replacing the
rms sensor. This procedure should be completed if the
troubleshooting procedure indicates that therms sensor
must be replaced, refer to Figure 4-S.
I. Carefully unsolder the defective sensor from
the AC PCB using a grounded soldering iron.
2. Install the new sensor (be sure that the sensor
spacer pad is in place) and replace the AC Assembly
and shield.
3. Remove R97 or RIOS, if installed, and replace
with the buss wire from the sensor kit.
4.
Remove R96 and Rl IO, if installed.
S. Plug the protection diode fixture into J 106.
Note that the fixture is symmetrical.
6. Turn RI 11 to its maximum counterclockwise
position.
7. Place all of the front panel switches to their out
position and apply power to the instrument.
8. Select AC+DC, RANGE HOLD and up range
to the 2V range. Monitor TP3 with a DVM,
connect a DC Calibrator to the input and apply
+ l .8V de. The sensor input should now be clamped
by the protection circuit and TP3 should read about
half the display reading.
9. Turn R 111 slowly clockwise and observe that
the DVM and instrument display readings increase.
The de voltage at TP3 should stop increasing at
around +0.8 to +I.OV. The instrument display
should stop increasing around 1.5 to I.99V, the
point at which the protection diodes clamp the
input. DO NOT ALLOW THE INSTRUMENT
TO GO INTO OVERLOAD. Return RI 11 to its
CCW stop and repeat the procedure with a negative
de input. Turn RI 11 CCW until TP3 reads about
-.SV and remove the calibrator and the protection
diode fixture.
IO. Short the input, select AC, RANGE HOLD
and step up range to the 2V range. Monitor TP3
and adjust R72 for 0 ±1 mV de.
11. Select AC+ DC and adjust R26 for 0 ±I m V
de on TP3.
12. Go to the rms protection circuit calibration
procedure, "RMS Protection Circuit Calibration",
and complete the steps as listed. Return to step 13
below.
13. Perform calibration steps 1 through le, as
listed in Table 4-7, Low and Midband Accuracy
Adjustments. Should RIOl not have enough
adjustment range, substitute one of the kit resistors
(lS kO, 30.1 kO, or 4S.3 kO) for RIOS ifreading is
too high, R97 if reading is too low or zero.
14. Monitor the ac voltage at TPS* with a DVM
and apply IOO mV, 20 Hz to the input with the
instrument in the 200 m V Range.
IS. If the monitored ac voltage is 36.0 mV or
greater, install the 402 kO resistors for R96 and
RlIO.**
16. If the monitored ac voltage is still 36.0 m V or
greater, install the IS8 kO resistors for R96 and
R 110.**
17. If the UUT is operating correctly, repeat the
entire CALIBRATION procedure, otherwise
return to beginning of Table 4-9.
*For AC PCB Assembly, Rev A, monitor CR9
cathode or JSOl pin 3.
**For AC PCB Assembly, Rev A, solder R96 and
Rl IO piggyback on RI07 and RIOS.
4-15
8920A/8921A
Table 4-9 8920A/8921A Troubleshootina Procedure
INSTRUCTION
STEP NO.
YES
NO
All front panel switches should be in the out position.
4-16
GOTO
2
2
Connect the UUT (8920A/8921 A) to appropriate line power and observe the display.
3
Does display light correctly?
4
Apply 1 V ac input to UUT, select AC function, VOL TS display mode and AUTORANGE.
5
Does UUT respond to input?
6
17
6
Does UUT pass the Low-Midband Check?
7
25
7
Does UUT pass the Low Level DC Check?
8
26
8
Does UUT pass the High Frequency Response Check?
9
28
9
UUT operating properly.
10
10
Apply 1 V ac to UUT in the 2V ac range.
17
11
Check appropriate display drivers, 0200-0204.
12
Correct power supply test point voltages are as follows:
TP205 = power supply ground.
3
4
5
12
TP206 = +15V; TP207
=
11
23
-5V;
13
13
lsTP206at+15V?
14
29
14
lsTP208at-15V?
15
31
15
Is TP207 at +5V?
16
32
16
Power supply is operating properly.
10
17
Check voltage between TP201 and TP202.
18
18
Is the voltage 0.5V, ±10%?
19
33
19
Does null/peak meter read approximately % scale?
20
40
20
Check A/D Converter, is it operating correctly?
24
21
21
Check TP200, is it at +6.4V?
22
42
22
Check the following for appropriate A/D Converter waveforms: U200-U202, U205 and TP203.
Refer to Figure 4-8.
23
23
Replace defective component.
24
24
Repeat Performance Tests and Calibration.
25
Check attenuator logic levels using Table 4-10.
10
23
26
Are 51 and 033 switching properly?
27
23
27
Check Amp A & B.
10
28
Check Amp A & B and attenuator network.
10
29
Remove AC PCB, is TP206 at +15V now?
30
43
8920A/8921 A
Table 4-9. 89 20AI 8921A Troubleshootma
Pr ocedure
cont
INSTRUCTION
STEP NO.
YES
NO
GOTO
30
Troubleshoot AC pcb assembly.
31
Remove AC pcb, is TP208 at -15V?
32
Check: VR203, U200-U202, U205, U206, U209, U210, U211, U4 and U302.
23
33
Check TP3.
34
34
Is voltage on TP3 at 0.5V ±10%?
35
Turn UUT off, disconnect UUT from line power.
23
30
35
44
45
36
CAUTION
To avoid damage to the RMS sensor, steps 37 and 38 must be performed
with a multimeter whose output on the ohms function is no greater than
10mA.
37
Is the resistance of U1-6 to U1 -7 (or J1.06-2 to J106-3) 90 ohms ±a%. (Out of circuit resistance = 100 ohms ±8%.)
38
Is the resistance of U1-8 to U1-9 (J1064 to J106-3)
39
Check U2, U4 and U5.
40
Check test point E3, is it at +1 V ±5%?
41
Check meter and U21 OB.
23
42
Check VR201.
23
43
Check V R202.
23
44
Check U203 through U207.
23
45
Check TP1.
46
46
Is TP1 at 0.045V ±10%?
47
Check TP2.
48
Is voltage on TP2 at 0.045V ±10%?
49
Check Amp B. Refer to the AC Amplifier schematic for voltage check points.
50
Replace rms sensor, refer to RMS Sensor Replacement Procedure.
51
Check U201A.
52
Check 03, 04, 05 and 06 (refer to Table 4-10) are they switching properly?
53
Check Amp A. Refer to the AC Amplifier schematic for voltage check points.
23
54
Check 031, 032 and 033.
23
= 100 ohms ±a%.
38
50
39
50
1
23
41
47
51
52
48
49
54
23
1
23
53
23
4-17
8920A/8921A
A/D WAVEFORMS (GENERAL CONDITIONS)
8920A/8921A READING 1000 COUNTS
SCOPE TRIGGERED ON - SLOPE OF A2
(PIN 38) X10 SCOPE PROBE (10 Mil)
TP 203- INTEGRATOR OUTPUT
PIN 36 (INTI
-0.5V
3
I\
I \
>
e>
-0.5V
r-
+1.2V
I
I
I
,____
>
e>
\
"'
\
GND
\
50ms/DIV
50ms/DIV
PIN 39 (DE HI U205
CM PIN 2 U205
:----1oomsGND
50ms/DIV
PIN 8 U200 (SCOPE PROBE WILL LOAD INPUT}
PIN 38 (AZ}
200ms
-100ms_.
GND
~GND
50ms/DIV
50ms/DIV
PIN 2 U200 THE SCOPE LOADING WILL RAISE READING
PIN 37 (INTI U205
+5V
-100ms_.
+o.sv-t---T---t---1~-1--+--+--+--l---l
GND
50ms/DIV
50ms/DIV
Figure 4-8. A/D Waveforms (General Condition)
4-18
8920A/8921A
Table 4-10. Attenuator Logic States
RANGE
K1
K2
03*
04*
05*
06
700V
0
1
0
1
1
0
200V
a
1
0
1
1
20V
0
1
1
0
1
2V
a
1
1
0
200mV
1
0
20mV
1
a
a
a
2mV
1
0
0
029*
028/030
031*
032
1
0
1
a
1
0
0
1
1
0
1
a
1
a
a
a
1
a
0
1
0
a
1
1
0
1
a
0
0
1
1
0
0
1
0
0
1
0
1
0
1
LOGIC LEVELS
1 = ov
0 = -15V
4-46.
*1 = -1.9V ±10%
*O = -14.BV ±10%
A/D Calibration Resistor Selection
4-47. This procedure is used to determine the correct
A/ D selected resistor, R204, and should be completed
whenever VR201 is replaced or when Rl205 does not
have enough range to calibrate the A/ D. All possible
values for R204, listed in Table4-l l, may be obtained in a
set by ordering Part #490722.
Amplifier
Amplifier
A
B
Q9/RI7 (set), Q8, QIO, and Ql2
Q36, Q37 / R46 (set), Q38, and Q40
All possible values for RI 9 or R34 (amplifier A) or R66
or R76 (amplifier B), listed in Table 4-12, may be
obtained in a set by ordering Part #490730. Two sets will
be necessary if both amplifiers require the same selected
resistor value.
4-50.
SET UP
.VOTE
I. Remove the cover shield of the AC Converter
PCB.
The UUT may gv into vverrange 11·ith R2U4
r1•11101•ed.
l. Place all front panel switches in the out
position and set T205 to the center of its adjustment
range.
2. Apply 100.09 mV, 200 Hz to the input and
select resistors R204 from Table 4-11, until the
display reads closest to 100.0 mV.
3. Verify that R205 has adjustment range on both
sides of the displayed 100.0 m V reading.
4.
4-48.
Perform the instrument calibration.
2. Connect a short jumper between input low and
the metal fence on the AC Converter PCB.
4-51.
AMPLIFIER B
(must be done before Amplifier A)
3. Apply power, short the input, select AC,
RANGE HOLD and step up to the 2V range.
4. Set R 72 to the center of its adjustment range
and monitor TP3 with a DVM.
DC Offset Resistor Selection
4-49. Use this procedure to determine the correct DC
offset selected resistors, R 19 ro R34 for amplifier A
and/or R66 or R76 for amplifier B. Use the procedure
when the amplifier offset cannot be adjusted to OV with
R26 and/ or R 72; usually because one or more of the
following have been replaced:
5. Select resistors from Table 4-12, starting with
the highest value until the DVM reads closest to 0
volts de. Place the resistor in the socket for R66 if
the DVM reads positive, R76 if the reading is
negative. Adjust R 72 for a DVM reading of less
than 1 m V de at TP3.
4-19
8920A/8921 A
4-52.
de. Place the resistor in the socket for R 19 if the
DVM reads positive, R34 if the reading is negative.
AMPLIFIER A
6. Select AC+DC set R26 to the center of its
adjustment range and monitor TP.3 \\ ith a DVM.
7. Select resistors from Table 4-12, starting with
the highest value until the DVM reads closest to OV
Table 4-11. R204 Resistive Values (mF, ±1%, 1/8W)
4-20
8. Adjust R26 for a DV M read mg nf b~ the I m \'
de at TP3.
9.
Perform the complete instrument calihrat11111.
Table 4-12. R19/R34, R66/R76 Resistive Values
(mF, ±1%, 1/BW)
VALUE
VALUE
VALUE
VALUE
71.5K
39.2K
332K
48.7K
66.5K
33.2K
169K
43.2K
61.9K
26.7K
115K
38.3K
56.2K
20.5K
86.6K
34.BK
51.1 K
14.0K
68.1K
31.6K
43.3K
7.15K
57.6K
Section 5
List of Replaceable Parts
TABLE OF CONTENTS
TITLE
TABLE
8920A/8921A Final Assembly ...........................................
A 1 8920A Main PCB Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Al 8921A Main PCB Assembly ..........................................
A 1A1 Display PCB Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A2 8920A/8921A AC PCB Assembly .....................................
5-1
5-2
5-3
5-4
5-5
PAGE
FIGURE
PAGE
5-3
5-5
5-11
5-17
5-18
5-1
5-2
5-3
5-4
5-5
5-4
5-9
5-15
5-17
5-24
5-1
8920A/8921 A
5-1.
INTRODUCTION
5-2. This section contains an illustrated parts
breakdown of the instrument (8920A/8921A).
Components are listed alpha-numerically by assembly.
Electrical components are listed by reference designation
and mechanical components by item number. Each listed
part i~ shown in an accompanying illustration.
5-3.
Parts lists include the following information:
5-4.
HOW TO OBTAIN PARTS
5-5. Components may be ordered from the nearest
Fluke authorized service center listed at the rear of this
manual. To ensure prompt and efficient handling of your
order, include the following information:
I.
Reference Designation or Item number.
2
Description of each part.
I.
Quantity.
3.
Fluke Stock number.
2.
FLUKE stock number.
4.
Manufacturer's part number or type.
3.
Description.
5.
Total quantity per assembly or component.
4.
Reference designation or Item number.
6. Recommended quantity: this indicates the
recommended number of spare parts necessary to
support one to five instruments for a period of two
years. This list presumes an availability of common
electronic parts at the maintenance site. For
maintenance for one year or more at an isolated
site, it is recommended that at least one of each
assembly in the instrument be stocked. In the case
of optional subassemblies, plug-ins, etc. that are
5-2
not always part of the instrument, or are deviations
from the basic instrument model, the REC QTY
column lists the recommended quantity of the item
in that particular assembly.
5. Printed circuit board part number and rev
letter.
6
Instrument model and serial number.
CAUTION
©
The above symbol indicates devices are
subject to damage by static discharge.
8920A/8921A
Table 5-1. 8920A/8921A Final Assembly
ITEM
NO.
DESCRIPTION
MODEL 8920A/8921A FINAL ASSEhBLY
© MAIN PCB ASSEMBLY
A1
FLUKE
STOCK
NO.
MFG
SPLY
CODE
ORDER
MODEL
MFG PART NO.
OR TYPE
TOT REC USE
QTY QTY COE
8920A OR 8921A
1
A2
8920A (8920A-4001) FIGURE 5-2
8921A (8921A-4011) FIGURE 5-3
AC PCB ASSY.(8920A/8921A)FIG. 5-5
ORDER MODEL 8920A
ORDER MODEL 8921A
489369 89526 489369
H1
H2
H3
H4
MP1
SCREW,FHP,6-32 X 3/4
SCREW, PHP, 2-56 X 1/4
SCREW 4-40 X 1/4 PHP
SCREW 6-32 X 5/8 FHP
GUARD COVER, C SIZE
114504
149534
256156
335158
464115
89536
73734
73734
89536
89536
114504
19002
23022
335158
464115
4
2
14
2
1
MP2
MP3
MP4
MP5
MP6
COVER, PLATE DOU
BAIL
RETAINER, HANDLE
DECAL, RETAINER
COVER, C SIZE
456764
467555
467563
473645
454736
89536
89536
89536
89536
89536
456764
467555
467563
473645
454736
1
1
1
1
1
MP7
MP8
MP9
MP10
MP 11
HANDLE
COVER, AC SHIELD
LINE CORD (NOT SHOWN)
SOLDER LUG,11/16 LG,#9(8921A ONLY)
SOLDER LUG,7/8 LG,#141(8920A ONLY)
454751
456848
343723
101055
104091
89536
89536
89536
79963
79963
454751
456848
343723
9
141
1
1
1
1
1
R1
R204
R3
SEE "RMS SENSOR REPLACEMENT"PROCEDURE.
SEE "AID CALIBRATION RESISTOR SELECTION"
SEE "DC OFFSET RESISTOR SELECTION".
SECTION 4
SECTION 4
SECTION 4
1
1
1
1
[!>
[1:::>
~ R1 IS A RESISTOR SET,(R97,R105,R96/R110
[1:::::>-
R3 IS A RESISTOR SET,(R19/R34, R66/R76
5-3
8920A/8921A
©
CAUT~?..f!.
~~ECTRICITY
BY
R204
SUBJECT
STATIC
DETAIL A
Figure 5-1. 8920A/8921 A F"mal Assembly
5-4
8920A/8921A
Table 5-2. Al 8920A Main PCB Assembly
DESCRIPTION
FLUKE
STOCK
NO.
MFG
SPLY
CODE
©MAIN PCB ASSEMBLY(8920A-4001)FIG.5-2
DISPLAY PCB ASSEMBLY(8920A/8921A)FIG.5-4
CAP,PLYPRP,0.47 UF +/-10%,100V
CAP,TA,0.47 UF +/-20%,35V
CAP,MICA,150 PF +/-5%,500V
ORDER
ORDER
446807
161349
148478
MODEL
MODEL
89536
56289
72136
8920A
8920A OR 8921A
446807
196D474X0035HA1
DMF15151J
ITEM
NO.
A1
A1A1
C200
C201
C202
MFG PART NO.
OR TYPE
TOT REC USE
OTY OTY COE
1
1
1
1
1
C203
C204
C205
C206
C207
CAP,PLYSTR,0.22 UF +/-10%,100V
CAP,CER,10,000 PF +/-20%,100V
CAP,CER,10,000 PF +/-20%,100V
CAP, MICA, 470 PF +/-5%,500V
CAP,MICA,3000 PF +/-5%,500V
436113
149153
149153
148429
161786
73445
56289
56289
72136
72136
C280MAH/220K
C023B1 OF103M
C023B10F103M
DMF19471J
DMF19302J
1
4
REF
1
1
C208
C209
C210
C211
C212
CAP,ELECT,220 UF -10/+75%,35V
CAP,ELECT,220 UF -10/+75%,35V
CAP,ELECT,220 UF -10/+75%,35V
CAP,ELECT,4700 UF -10/+100%,15V
CAP,CER,10,000 PF +/-20%,100V
460279
460279
460279
460261
149153
89536
89536
89536
80031
56289
460279
460279
460279
3143TS502V015
C023B10F103M
3
REF
REF
1
REF
C213
CR1
CR200
CR201
CR202
CAP,CER,10,000 PF +/-20%,100V
RECTIFIER BRIDGE, 50V, 25A
DIODE,MULTI-PELLET
DIODE,HI-SPEED SW
DIODE,HI-SPEED SW
149153
473520
375477
203323
203323
56289
21845
09214
07910
07910
C023B10F103M
J775-0LP
MPD200
IN4448
IN4448
REF
1
1
5
REF
CR203
CR204
CR205
CR206
CR207
DIODE,Hl-SPEED SW
RECTIFIER BRIDGE
RECTIFIER BRIDGE
DIODE,HI-SPEED SW
DIODE,HI-SPEED SW
203323
296509
296509
203323
203323
07910
21845
21845
07910
07910
IN4448
F903C-22
F903C-22
IN4448
IN4448
REF
2
REF
REF
REF
F1
H200
H201
H202
H203
FUSE, SLO-BLO
SCREW, ST. RHP, 4-40 X 1/4
WASHER, LOCK, STEEL F/#4
NUT, 4-40 HEX, STEEL
SCREW,PHP 6-32,THD 5/8 L
166488
256156
11039 5
184044
152181
71400
73734
73734
73734
73734
MDL1-8
22022
1355
8002A-NP
19047
1
10
2
2
1
H204
J1
J2
J6
J101
NUT,6-32 LOCKING
CONNECTOR BANANA
CONNECTOR BANANA
CONNECTOR,FEMALE
SOCKET, IN-LINE
152819
162073
162065
414201
436774
78199
74970
74970
02660
60065
511-061800-00
108-0903-001
108-0902-001
31-010
SS-109-1-04
J102
J103
J203
J301
J401
SOCKET,IN-LINE
SOCKET,IN-LINE
CONN,AC,PWR
CONN,MATING
POST,CNTACT
436774
436774
461806
461095
417329
60065
60065
89536
00779
22526
SS-109-1-04
SS-109-1-04
461806
87406-1
65500-104
J501
J601
L200
L201
M1
POST,CNTACT
POST,CNTACT
CHOKE,6 TURN
CHOKE,RF
METER,ANALOG PANEL
474213
478693
320911
186288
478685
22526
22526
89536
72259
32171
65500-1081
65500-110
320911
WEE390
OMC-DMA-001-CP2
1
1
1
1
1
MP1
MP203
MP204
MP205
MP206
BRACKET, SWITCH MOUNTING
BRACKET, METER MOUNTING
BRACKET,PUSH ROD
KNOB,SKIRTED
SHIELD, TRANSFORMER
475392
468868
456749
463224
467696
89536
89536
89536
89536
89536
475392
468868
456749
463224
467696
1
HEX STEEL
JACK BLACK
JACK, RED
BNC,8920A ONLY
1
1
1
1
1
1
1
1
1
3
REF
REF
1
1
1
1
1
1
1
...____
5-5
8920A/8921A
Table 5-2. A1 8920A Main PCB Assembly (cont)
ITEM
NO.
DESCRIPTION
FLUKE
STOCK
NO.
MFG
SPLY
CODE
MFG PART NO.
OR TYPE
TOT REC USE
QTY QTY COE
MP207
MP208
MP209
MP210
MP228
BRACKET, FRONT PANEL
PANEL,REAR
PUSH ROD, POWER SWITCH
COVER, AC SWITCH
GUARD, BASE
467704
456780
456731
475681
464404
89536
89536
89536
89536
89536
467704
456780
456731
475681
464404
1
1
1
1
1
MP229
MP231
MP232
MP233
MP234
LATCH, PTI
DECAL, KNOB
SPECIFICATION DECAL
PANEL, FRONT
DECAL, BASE SIDES
467548
473546
473611
453175
473652
89536
89536
89536
89536
89536
467548
473546
473611
453175
473652
2
1
1
1
2
MP235
MP236
Q200
Q201
Q202
BASE, STANDARD
HOLE,PLUG
XSTR, SI, PNP
XSTR,SI,PNP
XSTR ,SI ,PNP
454702
407502
340026
340026
340026
89536
89536
89536
89536
89536
454702
407502
340026
340026
340026
1
1
5
REF
REF
Q203
Q204
Q205
Q206
Q207
XSTR,SI,PNP
XSTR,SI,PNP
XSTR,SI,NPN
XSTR,SI,NPN
XSTR,SI,PNP PWR
340026 89536 340026
340026 89536 340026
218396 04713 2N3904
218396 04713 2N3904
325753 03508 D45C5
REF
REF
Q208
Q209
R200
R201
R202
XSTR,FET,GRP N-CHANNEL
XSTR,FET,GRP N-CHANNEL
RES,COMP,100K +/-5%,1/4W
RES,MTLFLM,2.15K +/-1%,1/8W
RES,MTLFLM,301K +/-1%,1/8W
261388
261388
148189
293712
379156
89536
89536
01121
91637
91637
261388
261388
CB1045
CMF552151F
CMF553013F
R203
R205
R206
R207
R208
RES,COMP,1M +/-5%,1/4W
RES,VAR,CER,10K +/-10%,1/2W
RES,MTLFLM,499K +/-1%,1/8W
RES,MTLFLM,47.5K +/-1%,1/8W
RES,COMP 10K +/-5%,1/4W
182204
309674
349191
474585
148106
01121
89536
91637
91637
01121
CB1055
309674
CMF554993F
CMF554752F
CB1035
R209
R210
R212
R213
R214
RES,COMP 68K +/-5%,1/4W
RES,COMP,150 +/-5%,1/4W
RES,COMP,22K +/-5%,1/4W
RES,COMP 10K +/-5%,1/4W
RES,COMP,330K +/-5%,1/4W
148171
147934
148130
148106
192948
01121
01121
01121
01121
01121
CB6835
CB1515
CB2235
CB1035
CB3345
R215
R216
R217
R218
R219
RES,COMP 10K +/-5%,1/4W
RES,COMP,6.8K +/-5%,1/4W
RES,COMP,22K +/-5%,1/4W
RES,COMP,100K +/-5%,1/4W
RES,COMP,1K,+/-5%,1/4W
148106 01121
148098 01121
148130 01121
148189 01121
148023 01121
CB1035
CB62825
CB2235
CB1045
CB1025
IE:f
1
1
REF
2
R220
R221
R222
R223
R224
RES,COMP,20K +/-5%,1/4W
RES,COMP,20K +/-5%,1/4W
RES,COMP,1K,+/-5%,1/4W
RES,COMP,20K +/-5%,1/4W
RES,VAR,CER,10K +/-10%,1/2W
221614
221614
148023
221614
309674
CB2035
CB2035
CB1025
CB2035
309674
3
REF
REF
REF
REF
R225
R226
R227
R228
R229
RES,MTLFLM,90.9K +/-1%,1/8W
RES,MTLFLM,953 +/-1%,1/8W
RES,MTLFLM ,909 +/-1%,1/8W
RES,MTLFLM,8.66K +/-1%,1/8W
RES,VAR,CER,2K +/-10%,1/2W
223537 91637
288555 91637
312629 91637
260364 91637
309666 89536
5-6
01121
01121
01121
01121
89536
CMF559092F
CMF559530F
CMF559090F
CMF558661F
309666
2
1
1
REF
1
1
2
1
REF
3
1
1
1
3
2
1
1
1
3
1
2
1
RU
1
1
1
1
1
1
1
8920A/8921 A
Table 5-2. A1 8920A Main PCB Assembly (cont)
ITEM
NO.
DESCRIPTION
FLUKE
STOCK
NO.
MFG
SPLV
CODE
MFG PART NO.
OR TYPE
TOT REC USE
OTV OTV COE
R230
R231
R232
R234
R235
RES,COMP,lM +/-5%,1/4W
RES,MTLFLM,11.8K +/-0.25%,1/8W
RES,MTLFLM,11.8K +/-0.25%,1/8W
RES,VAR,CER,lOOK +/-10%,1/2W
RES,MTLFLM,110K +/-1%,1/8W
182204
325688
325688
369520
234708
01121
91637
91637
89536
91637
CB1055
CMF551182F
CMF551182F
369520
CMF551103F
REF
2
REF
1
1
R236
R237
R238
R239
R240
RES,COMP,82K +/-5%,1/4W
RES,COMP,100K +/-5%,1/4W
RES,MTLFLM,100K +/-1%,1/8W
RES,COMP,150 +/-5%,1/4W
RES,COMP,1M +/-5%,1/4W
188458 01121
148189 01121
248807 91637
147934 01121
182204 01121
CB8235
CB1045
CMF551003F
CB1515
CB1055
1
REF
1
REF
REF
182204 01121
426759 89536
453662 89536
425900 89536
425900 89536
CB1055
426759
453662
425900
425900
REF
3
1
3
REF
425900 89536
426759 89536
426759 89536
453670 89536
453605 89536
425900
426759
426759
453670
453605
REF
REF
REF
1
1
RES,COMP,lM +/-5%,1/4W
R241
BUTTON,RANGE
S201-1
S201-206 SWITCH, SET
BUTTON,FUNCTION
S202-1
BUTTON,FUNCTION
S203-1
S204-1
S205-1
S206-1
S207
S208
BUTTON,FUNCTION
BUTTON,RANGE
BUTTON,RANGE
SWITCH, ROTARY
SWITCH, POWER
1
S208-1
S209
S210
T200
U200
BUTTON SWITCH, GREEN
SWITCH SLIDE
SWITCH SLIDE
POWER TRANSFORMER
©IC, C-MOS, QUAD BI-LATERAL SW.
445197 89536
234278 82389
234278 82389
458349 89536
363838 02735
445197
XW1659
XW1659
458349
CD4016AE
1
2
REF
1
1
U201
U202
U203
U204
U205
IC, LIN, OP-AMP
IC, LIN, 5 XSTR,ARRAY 2-PNP,3NPN
© IC,C-MOS,HEX BUFFER/
© IC,C-MOS,QUAD 2-INPUT NAND GATE
8920 CUSTOM LSI
428862
418954
381848
355198
458463
CA3130
CA30963E
CD4049AE
CD4011AE
458463
1
1
2
1
1
1
1
1
1
U206
U207
U209
U210
U211
IC,LIN,NPN XSTR.ARRAY
© IC,C...;MOS,HEX BUFFER/
© IC,C-MOS,HEX INVERTER
IC,LIN,OP-AMP
IC,LIN,OP-AMP
419002 02735
381848 02735
404681 02735
418566 18324
413740 18324
CA3086E
CD4049AE
CD4069UBE
LM358/CR999
LM307N
1
REF
1
1
1
1
02735
02735
02735
02735
89536
VR201
VR202
VR203
VR204
Wl
DIODE,ZENER,6.4V
IC,LIN,ADJ-REG
IC,LINEAR,VOL-REG
DIODE, ZENER
WIRE ASSY, FRONT PANEL
381988 04713
460410 12040
355107 07236
159798 07910
486654 89536
SZG20120
LM317T
F78050C
IN751A
486654
W2
W5
W6
W7
W10
WIRE ASSY, FRONT PANEL
WIRE ASSY, FRONT PANEL
WIRE ASSY,FUSE
WIRE ASSY, FUSE
GROUND STRAP ASSY, BRIDGE RECTIFIER
486662 89536
486605 89536
486621 89536
486621 89536
486647 89536
476662
486605
486621
486621
486647
Wll
W201
XFl
XFl-1
XR204
WIRE ASSY, BRIDGE RECTIFIER
WIRE ASSY, JUMPER
HOLDER, FUSE
FUSEHOLDER CAP,GREY,1/4" x 1-1?4"
SOCKET,RESISTOR
486639
486613
375188
460238
343285
486639
486613
375188
460238
2-33127-6
89536
89536
89536
89536
0779
1
1
1
1
1
1
1
[t:;>
1
1
1
1
1
1
2
REF
1
1
1
1
1
2
5-7
8920A/8921 A
Table 5-2. A1 8920A Main PCB Assembly (cont)
ITEM
NO.
XU200
XU202
XU203
XU205
DESCRIPTION
SOCKET,IC 14 PINS(NOT SHOWN)
SOCKET,IC(NOT SHOWN)
SOCKET,IC(NOT SHOWN)
SOCKET,IC,40 PINS
(!::::>-IF VR201 IS REPLACED THE AID CALIBRATION
RESISTOR (R204) MAY HAVE TO BE
RESELECTED,SEE SECTION 4 "AID
CALIBRATION RESISTOR SELECTION".
5-8
FLUKE
STOCK
NO.
MFG
SPLV
CODE
370304
343285
343285
429282
01295
00779
00779
09922
MFG PART NO.
OR TYPE
C931402
2-331271-6
2-331271-6
DILB40P-108
TOT REC USE
O.TV O.TV COE
1
2
REF
1
8920A/8921 A
W10
J5(TOP)
J4(BOTTOM)
H204
H203
F1
XF1
MP236
W11
MP228
T200
I
A1
MP235
MP232
VIEW B-B
REC.T.
Bl':l~E
MP210
I
L_l
W'IRINC;.
I
I
I
I
I
I
I
I
MP229
I
I
MP234
I
VIEW A-A
TYPICAL
r- - _ _J
BOTH SIPES
MP203
H200(2)
U205
I
~ SUB~~~!~?..~GE BY
\Y
STATIC ELECTRICITY
MP207
H200(2)
"
W1(RED)
W2(BLK)
J6
W5
J6
(REF)
CJ I.__
""'S208-1
A1A1
MP205
MP231
A1
Figure 5-2. A 1 8920A Main PCB Assembly
5-9
C11
CXl
I
_..
CD
I\.)
0
0
)>
CXl
--CD
I\.)
_..
)>
1
•
J101
,,
<C"
c:
;
c.n
~
-<m!).
Ou210
)>
.....
00
: 5202 $>
~201
<illD-
cc
0
)>
s:
0
:l
m
)>
~
CD
3
C'"
<
,.
....
~ ~6~'f?o. ~~~ ~
1
59O (:35
~­
~
-mm-
03
N
!j
S205
2
..
··o,~oo ~;(J
Q206 Q205
no
:l
e.
.6 ~I
:;:~ ~ :;:
f
U203
_
1 J30110
~ TP200.,----
~ ~~h
-
o
~
9
CR207
CR206
..
9-< ~
:::
9~6 6
9
I
I
·
:§~~
6
L___J ,.9 ..
J103
If
CR20S
~o IQl
l"l____+ I~~
R224
R234
--{C}~
-{Rill)-@ID-
1
J501
I
U207
0- ip 0-
:Ibo
R212
c:::::::::J.
I
1
Joo1
...,
U200
'2}
ON
J401
~o
T200
TO FU-:.~
Fl
TP208
..
-«::JCR203
J2!03
:
~.:~~
o~
~'L__J
100/120
•
220/240
s209
•
120/24~
• r5210
-.-
~EAR.
PA.NE\...
(&"::>'20A ONLY)
_ _ _ __JJ
TPIJ
20
7 R213 1
__Jw
0201 0204 U206
TO
TO JI
U200
-----------
oc
~,,9)
~
----
-~0--.,"..-~.. 1:2-:=~:0:-:- i--n~--;_J:;:,lol
~ ~ L2 ~ D
~ ~
I\
I !~ !~u~oai
188\
'~ ~ ~ \:.J
w
E3
~
}
---ccr
VR204
U204
~I
C200
CR204
~
8920A/8921A
Table 5-3. A1 8921A Main PCB Assembly
ITEM
NO.
A1
A1A1
C200
C201
C202
DESCRIPTION
FLUKE
STOCK
NO.
ORDER
©MAIN PCB ASSY,(8921A-4011)FIG,5-3
DISPLAY PCB ASSEMBLY(8920A/8921A)FIG.5-4 ORDER
446807
CAP,PLYPRP,0.47 UF +/-10%,100V
161349
CAP,TA,0.47 UF +/-20%,35V
148478
CAP,MICA,150 PF +/-5%,500V
MFG
SPLY
CODE
MFG PART NO.
OR TYPE
MODEL 8921A
MODEL 8920A OR 8921A
119536 446807
56289 196D474X0035HA 1
72136 DMF15151J
73445
56289
56289
72136
72136
TOT REC USE
QTY QTY COE
1
1
1
1
1
C280MAH/220K
C023B10F103M
C023B10F103M
DMF19471J
DMF19302J
1
3
REF
1
1
460279
460279
460279
3143TS502V015
C023B10F103M
3
REF
REF
1
REF
C203
C204
C205
C206
C207
CAP,PLYSTR,0.22 UF +/-10%,100V
CAP,CER,10,000 PF +/-20%,100V
CAP,CER,10,000 PF +/-20%,100V
CAP, MICA, 470 PF +/-5%,500V
CAP,MICA,3000 PF +/-5%,500V
436113
149153
149153
148429
161786
C208
C209
C210
C211
C212
CAP,ELECT,220 UF -10/+75%,35V
CAP,ELECT,220 UF -10/+75%,35V
CAP,ELECT,220 UF -10/+75%,35V
CAP,ELECT,4700 UF -10/+100%,15V
CAP,CER,10,000 PF +/-20%,100V
460279 89536
460279 89536
460279 89536
460261 80031
149153 56289
CR200
CR201
CR202
CR203
CR204
DIODE,MULTI-PELLET
DIODE,HI-SPEED SW
DIODE,HI-SPEED SW
D!ODE,HI-SPEED SW
RECTIFIER BRIDGE
375477
203323
203323
203323
296509
09214 MPD200
07910 IN4448
07910 IN4448
07910 IN4448
21845 F903C-22
1
5
REF
REF
2
CR205
CR206
CR207
F1
H200
RECTIFIER BRIDGE
DIODE,HI-SPEED SW
DIODE,HI-SPEED SW
FUSE, SLO-BLO
SCREW, ST. RHP, 4-40 X 1/4
296509
203323
203323
166488
256156
21845 F903C-22
07910 IN4448
07910 IN4448
71400 MDL1-8
73734 22022
REF
REF
REF
H201
H202
li205
H206
H207
WASHER, LOCK, STEEL F/#4
NUT, 4-40 HEX, STEEL
SCREW,PHP,4-40 X 5/16(NOT SHOWN)
SCREW,PHP,4-40 X 5/16(NOT SHOWN)
NUT,HEX DBL CHMF(NOT SHOWN)
110395
184044
152116
152116
110635
73734 1355
73734 8002A-NP
73734 19023
73734 19023
73734 8003-NP
2
2
2
H208
J3
J4
J5
J6
NUT,HEX DBL CHMF(NOT SHOWN)
CONNECTOR BANANA JACK,GREEN
CONNECTOR BANANA JACK,BLACK
CONNECTOR BANANA JACK,RED
BLANK JACK,BANANA,BLACK
110635
479329
162073
162065
484329
73734
74970
74970
74970
89536
J7
J101
J102
J103
J203
BLANK JACK,BANANA,BLACK
SOCKET,IN-LINE
SOCKET,IN-LINE
SOCKET,IN-LINE
CONN,AC,PWR
484329 89536 484329
436774 60065 SS-109-1-04
436774 60065 SS-109-1-04
436774 60065 SS-109-1-04
461806 89536 461806
J301
J401
J501
J601
L200
CONN,MATING
POST,CNTACT
POST,CNTACT
POST,CNTACT
CHOKE, 6 TURN
461095 00779 87406-1
417329 22526 65500-104
474213 22526 65500-1081
478693 22526 65500-110
320911 89536 320911
L201
M1
MP1
MP203
MP204
CHOKE,RF
METER, ANALOG PANEL
BRACKET, SWITCH MOUNTING
BRACKET, METER MOUNTING
BRACKET,PUSH ROD
186288
478685
475392
468868
456749
72259
32171
89536
89536
89536
8003-NP
479329
108-0903-001
108-0902-001
484329
WEE390
OMC-DMA-001-CP2
475392
468868
456749
1
1
1
1
1
1
10
RBF
2
RBF
1
1
1
2
RIP
3
REP
RBF
1
1
1
1
1
1
1
1
1
1
1
5-11
8920A/8921 A
Table 5-3. A 1 8921 A Main PCB Assembly {cont)
ITEM
N.O.
XR204
XU200
XU202
XU203
XU205
DESCRIPTION
SOCKET ,RESISTOR
SOCKET, IC 14 PINS(NOT SHOWN)
SOCKET,IC(NOT SHOWN)
SOCKET,IC(NOT SHOWN)
SOCKET,IC,40 PINS(NOT SHOw~)
Q:::::>IF VR201 IS REPLACED THE A/D CALIBATION
RESISTOR (R204) MAY HAVE TO BE
RESELECTED, SEE SECTION 4 "AID
CALABRATION RESISTOR SELECTION".
5-14
FLUKE
STOCK
NO.
MFG
SPLY
CODE
343285
370304
343285
343285
429282
0779
01295
00779
00779
09922
MFG PART NO.
OR TYPE
2-33127-6
C931402
2-331271-6
2-331271-6
DILB40P-108
TOT REC USE
UTV UTV COE
2
1
2
REF
1
8920A/8921A
J6/J7
F1
XF1
MP208
MP228
T200
rA1
1
MP210
I
MP235
MP232
L_I
I
I
I
I
I
I
I
I
I
I
MP234
VIEW' A-A
r- - __J
TYPICAL BOTH SIPE'S
MP203
H200(2)
1(1\ SUB~~~!~~~GE
\bl ST~TIC
MP209
I
MP229
I
D
U205
BY
ELECTRICITY
MP207
H200(2)
W1(RED)
W2(BLK)
A1A1
J5
W5
J4
MP205
J3
MP231
000000
Figure 5-3. A 1 8921A Main PCB Assembly
5-15
8920A/8921A
Table 5-5. A2 8920A/8921A AC PCB Assembly
ITEM
NO.
DESCRIPTION
FLUKE
STOCK
NO.
MFG
SPLY
CODE
89536
A2
AC PCB ASSY(20A/21A-4003T)FIG.5-5
489369
C1
C2
C3
CAP,FIXED,0.022UF +/-10%,630V
CAP,PORC, 180PF +/-5%, 1KV
CAP,PORC,4.3PF +/-0.25PF,1.7KV
C4
C5
C6
C7
CB
cg
MFG PART NO.
OR TYPE
TOT REC USE
QTY QTY COE
489369
1
479519 73445
474551 95275
479253 95275
C280MAG/A22K
VY15CA181JA
VY10CA4R3
1
1
1
CAP,CER,510PF +/-5%,100V
CAP,VAR,1-5-0.25PF, 2000V
CAP,CER,39PF +/-5%,100V
CAP,CER,5100PF +/-5%,100V
CAP,VAR,5.5-18PF,350V
460832 95275
218206 72982
460824 95275
460840 95275
460170 72982
VK20BA511J
530-000
VK20BA390J
VK20BA512J
538-002
1
3
1
1
1
C12
C13
C14
C15
CAP,VAR,1.7-6PF,250V
CAP,CER,10,000 +/-20%,100V
CAP,VAR,1-5-0.25PF,2000V
CAP,MINI CER,1.8PF +/-0.25PF,100V
CAP,CER,50000PF -20/+80%,25V
460147
149153
218206
474940
148924
91293
56289
72982
80031
72892
9300
C023B101F103M
530-000
2222-638-03188
5855-000-Y5UD-503Z
1
8
2
1
2
C16
C17
C18
C19
C20
CAP,TA,10UF +/-20%,20V
CAP,CER,10,000 +/-20%,100V
CAP,TA,1.0UF +/-20%,35A
CAP,CER,10,000 +/-20%,100V
CAP,TA,10UF +/-20%,20V
330662
149153
161919
149153
330662
56289
56289
56289
56289
56289
196D106X0020KA1
C023B101F103M
196D105X0035JA1
C023B101F103M
196D106X0020KA1
11
REF
1
REF
REF
C22
C23
C24
C25
C26
CAP,MINI-CER,33PF +/-2%,100V
CAP MINI-CER,100PF +/-2%,100V
CAP,TA,10UF +/-20%,20V
CAP,CER,10,000 +/-20%,100V
CAP,MINI-CER,68PF +/-2%,100V
354852
369173
330662
149153
362756
80031
80031
56289
56289
80031
2222-638-10399
2222-638-10101
196D106X0020KA1
C023B101F103M
2222-631-10689
2
1
REF
REF
1
C28
C29
C31
C33
C34
CAP,TA,10UF +/-20%,20V
CAP,TA,10UF +/-20%,20V
CAP,CER,22UF +/-20j,50V
CAP,VAR,1-5-0.25PF,2000V
CAP,TA,10UF +/-20%,20V
330662 56289
330662 56289
190314 51642
218206 72982
330662 56289
196D106X0020KA1
196D106X0020KA1
200-050-601-502M
530-000
196D106X0020KA1
REF
REF
1
REF
REF
C35
C36
C37
C39
C40
CAP,CER,50000PF -20/+80%,25V
CAP,CER,10,000 +/-20%,100V
CAP,MINI-CER,33PF +/-2%,100V
CAP,TA,10UF +/-20%,20V
CAP,TA,10UF +/-20%,20V
148924 72892
149153 56289
354852 80031
330662 56289
330662 56289
5855-000-Y5UD-503Z
C023B101F103M
2222-638-10399
196D106X0020KA1
196D106X0020KA1
REF
REF
REF
REF
REF
C41
C42
C43
C45
C48
CAP,CER,10,000 +/-20%,100V
CAP,TA,10UF +/-20%,20V
CAP,TA,10UF +/-20%,20V
CAP,TA,39UF +/-20%,20V
CAP,TA,39UF +/-20%,20V
149153 56289
330662 56289
330662 56289
358234 56289
358234 56289
C023B101F103M
196D106X0020KA1
196D106X0020KA1
196D396X0020PE4
196D396X0020PE4
REF
REF
REF
2
REF
C49
C50
C51
C53
C54
CAP,CER,1000PF +/-10%,500V
CAP,CER,10,000 +/-20j,100V
CAP,CER,10,000 +/-20%,100V
CAP PAIR (C53 & C55)
CAP,CER,1000PF +/-10%,500V
357806
149153
149153
463208
357806
56289
56289
56289
89536
56289
C016B102G-102K
C023B101F103M
C023B101F103M
463208
C016B102G-102K
2
REF
REF
2
REF
C55
C56
C57
C58
CR1
CAP PAIR (C53 & C55)
CAP,TA,10UF +/-20%,20V
CAP,MYLAR,0.027UF +/-10%,250V
CAP,VAR,1.7-10,250V
DIODE,HI-SPEED SWITCH
463208
330662
267120
321109
203323
89536 463208
56289 196D106X0020KA1
73445 C280MAE/A47K
91293 9301
07910 IN4448
5-18
REF
REF
1
1
7
1
1
1
1
2
8920A/8921 A
Table 5-5. A2 8920A/8921A AC PCB Assembly (cont)
ITEM
NO.
DESCRIPTION
FLUKE
STOCK
NO.
MFG
SPLY
CODE
MFG PART NO.
OR TYPE
TOT REC USE
QTY QTY COE
CR2
CR3
CR4
CR5
CR6
DIODE,HI-SPEED SWITCH
DIODE,SI,LO-CAP LO-LEAK
DIODE,SI,LO-CAP LO-LEAK
DIODE,HI-SPEED SWITCH
DIODE,HI-SPEED SWITCH
203323
348177
348177
203323
203323
07910
07263
07263
07910
07910
IN4448
FD7223
FD7223
IN4448
IN4448
REF
2
REF
REF
REF
CR7
CR8
CR9
J106
K1
DIODE,HI-SPEED SWITCH
DIODE,HI-SPEED SWITCH
DIODE,HI-SPEED SWITCH
SOCKET,SINGLE IN-LINE,4 POST CONTACT
COIL,REED RELAY
203323
203323
203323
417311
446898
07910
07910
07910
30035
71707
IN4448
IN4448
IN4448
SS-109-1-04
U20134
REF
REF
REF
1
2
K1-1
K2
K2-1
MP1
MP183
REED SWITCH
COIL,REED RELAY
REED SWITCH
SHIELD,AC
SPACER,XSTR MNTG
284091
446898
284091
456830
472969
95348 MR138
71707 U20134
95348 MR138
89536 456830
13103 7717-30
MP202
MP208
P101
P102
P103
SHIELD
THERMAL EQUALIZER
POST,CONTACT
POST,CONTACT
POST,CONTACT
456830 89536
489179 89536
474742 22526
474742 22526
474742 22526
456830
489179
65500-109
65500-109
65500-109
1
1
3
REF
REF
P104
Q1
Q2
Q3
Q4
CONNECTOR
XSTR,SI,NPN SELECTED
XSTR,SI,NPN SELECTED
XSTR,FET,JCT,N-CHANNEL
XSTR,FET,JCT,N-CHANNEL
485169 89536
471565 89536
471565 89536
477448 89536
376475 89536
485169
471565
471565
477448
376475
1
2
REF
1
6
Q5
Q6
Q9
Q10
XSTR,FET,JCT,N-CHANNEL
XSTR,FET,JCT,N-CHANNEL
XSTR,SI,PNP
DUAL FET/RESISTOR SET
XSTR, MATCHED SET
376475 89536
376475 89536
453829 24355
476788 89536
463133 89536
376475
376475
AD821
476788
463133
REF
REF
2
1
1
Q11
Q12
Q13
Q14
Q15
XSTR,SI,PNP
XSTR, MATCHED SET
XSTR,SI NPN
XSTR,SI NPN
XSTR,SI,PNP
454066 04713
463133 89536
333898 89536
333898 89536
225599 12040
SP7755
463133
333898
333898
PN4250
10
REF
7
REF
2
Q16
Q17
Q18
Q19
Q20
XSTR,SI,PNP
XSTR,SI NPN
XSTR,SI,PNP
XSTR,SI NPN
XSTR,SI,PNP
454066 04713
333898 89536
454066 04713
333898 89536
454066 04713
SP7755
333898
SP7755
333898
SP7755
REF
REF
REF
REF
REF
Q21
Q23
Q24
Q25
Q26
XSTR,SI,PNP
XSTR,SI,NPN
XSTR,SI,PNP
XSTR,SI,NPN
XSTR, SI, PNP
454066
218081
229898
218081
229898
04713
89536
89536
89536
89536
SP7755
218081
229898
218081
229898
REF
4
4
REF
REF
Q28
Q29
Q30
Q31
Q32
XSTR,FET,JCT,N-CHANNEL
XSTR,FET,N-CHANNEL
XSTR,FET,N-CHANNEL
XSTR,FET,N-CHANNEL
XSTR,FET,JCT,N-CHANNEL
376475
261578
261578
261578
376475
89536
89536
89536
89536
89536
376475
261578
261578
261578
376475
REF
3
REF
REF
REF
QB
1
2
REF
REF
1
1
1
1
2
1
~B
2
[t>
1
1
1
1
1
5-19
8920A/8921 A
Table 5-5. A2 8920A/8921A AC PCB Assembly (cont)
ITEM
NO.
DESCRIPTION
FLUKE
STOCK
NO.
MFG
SPLY
CODE
89536
24355
89536
89536
04713
MFG PART NO.
OR TYPE
TOT REC USE
QTY QTY COE
Q33
Q36
Q37
Q38
Q39
XSTR,FET,JCT,N-CHANNEL
XSTR,SI,PNP
DUAL FET/RESISTOR SET
XSTR, MATCHED SET
XSTR,SI,PNP
376475
453829
476788
463133
454066
376475
AD821
476788
463133
SP7755
REF
REF
REF
REF
REF
Q40
Q41
Q42
Q43
Q44
XSTR, MATCHED SET
XSTR,SI NPN
XSTR ,SI, PNP
XSTR,SI,PNP
XSTR,SI NPN
463133 89536 463133
333898 89536 333898
225599 12040 PN4250
454066 04713 SP7755
333898 89536 333898
REF
REF
REF
REF
REF
Q45
Q47
Q48
Q49
Q50
XSTR,SI,PNP
XSTR,SI NPN
XSTR,SI,PNP
XSTR,SI,PNP
XSTR,SI,NPN
454066 04713
333898 89536
454066 04713
454066 04713
218081 89536
SP7755
333898
SP7755
SP7755
218081
REF
REF
REF
REF
REF
Q51
Q52
Q53
Q55
Q56
XSTR,SI,PNP
XSTR,SI,NPN
XSTR,SI,PNP
XSTR,SI,NPN
XSTR,SI,PNP
229898 89536
218081 89536
229898 89536
330803 89536
418707 07910
229898
218081
229898
330803
MPS6562
REF
REF
REF
1
1
R1
R2
R3
R4
R5
RES,MF,1M +/-1%,1/2W
RES,FXD,9.91M +/-1%,1/2W
RES,VAR,CER,5K +/-10%,1/2W
RES,MF,96.5K +/-1%,1/8W
RES,VAR,10 +/-20%,1/2W
161075
460121
327569
474478
479311
91637
91637
89536
91637
80031
CMF651004F
HFF1-9914F
327569
CMF559652F
ET50W100
1
1
2
1
1
R6
R7
R8
R9
R10
RES,MF,1M +/-1%,1/4W
RES,VAR,CER,500 +/-10%,1/2W
RES,MF,9.76K +/-0.5j,1/8w
RES,COMP,15K +/-5j,1/4W
RES,COMP,100 +/-5%,1/4W
474486 91637
325613 89536
474460 91637
148114 01121
147926 01121
CMF601004F
325613
CMF559761D
CB1535
CB105
1
2
1
2
6
R11
R12
R13
R14
R15
RES,COMP,15K +/-5%,1/4W
RES,CERMET,9.09M +/-1j,1/4W
RES,MF,20 +/-0.5%,1/8W
RES,COMP,1M +/-5%,1/4W
RES,COMP,6.2M +/-5%,1/4W
148114 01121
459875 89536
494302 91637
182204 01121
221960 01121
CB1535
459875
CMF55R200D
CB1055
CB6255
REF
1
2
5
2
R16
R17
R18
R19
R20
RES,COMP,22M +/-5%,1/4W
RESISTOR/DUAL FET SET
RES SET (R18,R35,R65,R79)
SELECTED IN TEST
RES,COMP,510 +/-5%,1/4W
221986 01121
476788 89536
463182 89536
CB2265
476788
463133
1
1
1
218032
CB5115
3
R21
R22
R23
R25
R26
RES,COMP,390 +/-5%,1/4W
RES,COMP,8.2K +/-5%,1/4
RES,COMP,10K +/-5%,1/4W
RES,MF,499K +/-1%,1/8W
RES,VAR,CER,100K +/-10%,1/2W
147975 01121
160796 01121
148106 01121
268813 91637
369520 89536
CB3915
CB8225
CB1035
CMF554993F
369520
4
2
2
3
2
R27
R28
R29
R30
R31
RES,COMP,390
RES,MF,1.58K
RES,COMP,100
RES,COMP,100
RES,MF,8.06K
147975 01121
385344 91637
147926 01121
147926 01121
294942 91637
CB3915
CMF551581F
CB105
CB105
CMF558061F
REF
1
REF
REF
1
5-20
+/-5%,1/4W
+/-1%,1/8W
+/-5%,1/4W
+/-5%,1/4W
+/-1%,1/8W
01121
~
@:::::>
1
1
1
1
1
1[.t:::::=
1[t>
1
8920A/8921 A
Table 5-5. A2 8920A/8921A AC PCB Assembly (cont)
ITEM
NO.
DESCRIPTION
FLUKE
STOCK
NO.
MFG
SPLY
CODE
175034
01121
MFG PART NO.
OR TYPE
TOT REC USE
QTY QTY COE
R33
R34
R35
R36
R37
RES,COMP,33 +/-5%,1/4W
SELECTED IN TEST
RES SET (R18,R35,R65,R79)
RES,MF,619 +/-1%,1/8W
RES,COMP,100 +/-5%,1/4W
463182 89536
313072 91637
147926 01121
463133
CMF556190F
CB105
4
REF
REF
4
REF
R38
R39
R40
R41
R42
RES,MF,619 +/-1%,1/8W
RES,COMP,33 +/-5%,1/4W
RES,COMP,820 +/-5%,1/4W
RES,COMP,22K +/-5%,1/4W
RES,COMP,160 +/-5%,1/4W
313072 91637 CMF556190F
175034 01121 CB3305
148015 01121 CB8215
148130 01121 CB2235
261859 01121 CB1615
REF
REF
2
2
2
R43
R44
R45
R46
R47
RES,VAR,CER,500 +/-10%,1/2W
RES,VAR,CER,50 +/-10%,1/2W
RES,MF,121 +/-1%,1/8W
RESISTOR/DUAL FET SET
RES,COMP,300 +/-5%,1/4W
325613 89536
447862 89569
343160 91637
476788 89536
348276 01121
325613
447862
CMF551210F
476788
CB3015
REF
1
2
REF
4
R48
R49
R50
R51
R52
RES,COMP,18 +/-5%,1/4W
RES,COMP,18 +/-5%,1/4W
RES,COMP,300 +/-5%,1/4W
RES,MF,442 +/-1%,1/8W
RES,MF,100 +/-1%,1/8W
219022
219022
348276.
474452
474437
01121
01121
01121
91637
91637
CB1805
CB1805
CB3015
CMF554420F
CMF551000F
4
REF
REF
1
2
R53
R54
R55
R56
R57
RES,MF,12.1 +/-1%,1/8W
RES,COMP,1K +/-5%,1/4W
RES,MF,20 +/-0.5%,1/8W
RES PAIR (R56 & R57)
RES PAIR (R56 & R57)
296608 91637
148023 01121
494302 91637
467662 89536
467662 89536
CMF5512R1F
CB1025
CMF55R200D
467662
467662
1
2
REF
1
REF
R58
R59
R60
R62
R63
RES,COMP,1M +/-5%,1/4W
RES,COMP,1M +/-5%,1/4W
RES,COMP,1M +/-5%,1/4W
RES,COMP,1M +/-5%,1/4W
RES,COMP,6.2M +/-5%,1/4W
182204 01121
182204 01121
182204 01121
182204 01121
221960 01121
CB1055
CB1055
CB1055
CB1055
CB6255
REF
REF
REF
REF
REF
R65
R66
R67
R68
R69
RES SET (R18,R35,R65,R79)
SELECTED IN TEST
RES,COMP,510 +/-5%,1/4W
RES,MF,3.57K +/-1%,1/8W
RES,COMP,100 +/-5%,1/4W
463182 89536
463133
218032 01121
226217 91637
147926 01121
CB5115
CMF553571F
CB105
REF
REF
REF
1
REF
R70
R71
R72
R73
R74
RES,COMP,33 +/-5%,1/4W
RES,MF,499K +/-1%,1/8W
RES,VAR,CER,100K +/-10%,1/2W
RES,COMP,390 +/-5%,1/4W
RES,COMP,8.2K +/-5%,1/4
175034
268813
369520
147975
160796
01121
91637
89536
01121
01121
CB3305
CMF554993F
369520
CB3915
CB8225
REF
REF
REF
REF
REF
R75
R76
R77
R78
R79
RES,COMP,10K +/-5%,1/4W
SELECTED IN TEST
RES,COMP,390 +/-5%,1/4W
RES,MF,619 +/-1%,1/8W
RES SET (R18,R35,R65,R79)
148106
01121
CB1035
147975 01121
313072 91637
463182 89536
CB3915
CMF556190F
463133
REF
REF
REF
REF
REF
R80
R82
R83
R84
R85
RES,COMP,100 +/-5%,1/4W
RES,COMP,820 +/-5%,1/4W
RES,MF,619 +/-1%,1/8W
RES,COMP,22K +/-5%,1/4W
RES,COMP,33 +/-5%,1/4W
147926 01121
148015 01121
313072 91637
148130 01121
175034 01121
CB105
CB8215
CMF556190F
CB2235
CB3305
REF
REF
REF
REF
REF
CB3305
@=:::>
1
2
2
1
~
[%::::>
5-21
8920A/8921 A
Table 5-5. A2 8920A/8921A AC PCB Assembly (cont)
ITEM
NO.
DESCRIPTION
FLUKE
STOCK
NO.
MFG
SPLY
CODE
MFG PART NO.
OR TYPE
TOT REC USE
QTY QTY COE
R86
R87
R88
R89
R90
RES,COMP,160 +/-5%,1/4W
RES,COMP,300 +/-5%,1/4W
RES,COMP,300 +/-5%,1/4W
RES,COMP,18 +/-5%,1/4W
RES,COMP,18 +/-5%,1/4W
261859 01121
348276 01121
348276 01121
219022 01121
219022 01121
CB1615
CB3015
CB3015
CB1805
CB1805
REF
REF
REF
REF
REF
R91
R92
R93
R94
R95
RES,MF,1K +/-1%,1/8W
RES,MF,100 +/-1%,1/8W
RES,MF,7.50K +/-1%,1/8W
RES,MF,51.1K +/-1%,1/8W
RES,COMP,1K +/-5%,1/4W
474445 91637
474437 91637
223529 91637
289553 91637
148023 01121
CMF551001F
CMF551000F
CMF557501F
CMF555112F
CB1025
1
REF
1
1
REF
R96
R97
R98
R99
R100
SELECTED IN TEST
SELECTED IN TEST
RES,MATCHED SET
RES,MF,20.5K +/-1%,1/8W
RES,MF,499K +/-1%,1/8W
R101
R102
R103
R104
R105
REF
IT:>
89536
91637
91637
458299
CMF552052F
CMF554993F
2
REF
REF
1
RES,VAR,CER,10K +/-10%,1/2W
RES,MF,357K +/-1%,1/8W
RES,MF,110K +/-1%,1/8W
RES,MF,20.5K +/-1%,1/8W
SELECTED IN TEST
309674 89536
235002 91637
234708 91637
261669 91637
309674
CMF553573F
CMF553573F
CMF552052F
2
1
1
2
REF
1
R106
R107
R108
R109
R110
RES, MATCHED SET
RES,MF,82.5K +/-1%,1/8W
RES,MF,82.5K +/-1%,1/8W
RES,MF,2K +/-1%,1/8W
SELECTED IN TEST
458299
246223
246223
235226
89536
91637
91637
91637
458299
CMF558252F
CMF558252F
CMF552001F
REF
2
REF
1
REF
R111
R112
R113
R114
R115
RES,VAR,CER,5K +/-10%,1/2W
RES,MF,3.01K +/-1%,1/8W
RES,MF169K +/-1%,1/8W
RES,COMP,510 +/-5%,1/4W
RES,MF,14.3K +/-1%,1/8W
327569
322645
289454
218032
291617
89536
91637
91637
01121
91637
327569
CMF553011F
CMF551693F
CB5115
CMF551432F
REF
1
1
REF
1
R117
R118
U1
U2
U3
RES,MF,1K +/-1%,1/8W
RES,COMP,150K +/-5%,1/4W
RMS SENSOR KIT
IC,OP AMP,J-FET
IC,LINEAR,OP AMP
168229 91637
275685 01121
489377 89536
357830 89536
418566 18324
U4
U5
VR1
VR2
VR3
IC,LINEAR,OP AMP
IC,LINEAR 5 XSTR ARRAY
DIODE,ZENER,5.6V
DIODE,ZENER,5.6V
DIODE,ZENER
VR4
XR18
XR35
XR65
XR79
DIODE,ZENER 13V
SOCKET,IN-LINE,5-CNTCT(NOT SHOWN)
SOCKET,IN-LINE,5-CNTCT(NOT SHOWN)
SOCKET,IN-LINE,5-CNTCT
SOCKET,IN-LINE,5-CNTCT(NOT SHOWN)
[!:::::>-THESE RESISTORS ARE PART OF THE RMS
SENSOR KIT AND MAY BE OBTAINED
WITH THE SENSOR BY ORDERING PART#489377
(SEE SECTION 4,"RMS SENSOR REPLACEMENT")
5-22
458299
261669
268813
[[::>2
[C::>-
CMF551001F
CB1545
489377
357830
LM358/CR3999
1
1
1
1
2
1
1
418566
248906
277236
277236
330829
18324 LM358/CR3999
02735 CA3046
07910 IN752A
07910 IN752A
07910 IN4571
REF
1
2
REF
1
1
1
110726
417899
417899
417899
417899
07910
52072
52072
52072
52072
IN964B
CA-05S-TSD
CA-05S-TSD
CA-05S-TSD
CA-05S-TSD
1
5
REF
REF
REF
1
1
8920A/8921 A
Table 5-5. A2 8920A/8921A AC PCB Assembly (cont)
ITEM
NO.
DESCRIPTION
FLUKE
STOCK
NO.
MFG
SPLV
CODE
MFG PART NO.
OR TYPE
TOT REC USE
QTY QTY CDE
[l::::::>IF ANY ONE OF THE FOUR MATCHED XISTORS
ARE DAMAGED ALL FOUR WILL HAVE TO BE
REPLACED AND THE DC OFFSET RESISTORS
FOR AMP-A AND AMP-B WILL HAVE TO BE
RESELECTED. THEREFORE IT WILL BE
NECESSARY TO ORDER TWO RESISTOR SETS
SEE SECT.4"DC OFFSET RESISTOR SELECTION"
[j::>-- IF
THIS PART IS REPLACED THE DC OFFSET
RESISTOR FOR THE CORRESPONDihG AMPLIFIER
(AMP-A,AMP-B)MAY HAVE TO BE RESELECTED
SEE SECT.4"DC OFFSET RESISTOR SELECTION"
5-23
8920A/8921 A
;;;
...
..,
..
:
-o 0
..,
0
0
Pl05 @
Figure 5-5. A2 8920A/8921 A AC PCB Assembly
5-24
8920A/8921A
Section 6
Option & Accessory Information
6-1.
INTRODUCTION
6-2. This section of the manual contains information
concerning the options and accessories available for use
with the Model 8920A or 8921A. It consists of an
introductory section, an accessories subsection and a
series of option subsections. All options and accessories
are listed by model or option number in the table of
contents included in this section.
6-3. Hardware type accessories, i.e., rack mounting kits
and cables, are documented in the accessories subsection.
While option numbers (-003, -004) are documented as
individual subsections. Each subsection contains all of
the information necessary to install, operate and
maintain each option and accessory. This includes a list
of replaceable parts and a schematic (if applicable).
6-4. The location of a particular subsection is facilitated
by the use of unique page and paragraph numbering
which corresponds to the option or accessory in question.
For example, a 600-X series identifies the general
accessories subsection and a 604-X series identifies the
subsection for the -004 option (where Xis the individual
page or paragraph number).
6-1
8920A/8921 A
TABLE OF CONTENTS
OPTION/
MODEL NO.
-003
-004
6-2
DESCRIPTION
PAGE
ACCESSORIES ......................................................... .... 600-1
OPTIONS
Counter Output Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 603-1
Logarithmic Analog Output Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 604-1
8920A/8921 A
Accessories
600-1. RACK MOUNTING KIT, SINGLE
(Y2014)
600-2. The 8920A/8921A can be rack-mounted in a
standard 19-inch equipment rack using Rack Mounting
Kit (Y2014). The kit comes complete with installation
instructions.
600-3. RACK MOUNTING KIT, DOUBLE
(Y2015)
600-4. The 8920A/8921A can be rack mounted side by
side in a standard 19-inch equipment rack using Rack
Mounting Kit (Y2015). The kit comes complete with
instructions for installing any two C size PTI cases into a
standard equipment rack.
600-5. PANEL ADAPTER KIT, DIN SIZE,
(Y2020)
600-6. The 8920A/8921A can be rack mounted in a
DIN size equipment rack using the Panel Adapter Kit
(Y2020). The kit comes complete with instructions for
installing the front panel adapter onto the 8920A or
8921A.
600-1 /600-2
8920A/8921A
-003 Option
Counter Output
603-1.
INTRODUCTION
603-2. The -003 Counter Output Option converts an
rms input signal into an isolated JOO mV peak, square
wave suitable for triggering a counter. There are several
advantages as opposed to using separate inputs for the
DVM and the counter. First, the 8920A or 8921A
autoranged input has a much greater dynamic range than
a counter. This means that input sensitivity is increased to
180 uV while, on the other hand, inputs as large as 700V
rms will not overload the counter. In practice, inputs
should be 1.8 mV or greater due to possible false
triggering effects of noise riding on lower level inputs.
Secondly, because the counter output is isolated,
frequency sources as high as 500V common mode voltage
above earth ground can be measured (with the 8921A).
Third, only one probe is needed to make a simultaneous
voltage and frequency measurements. The counter
option is available on both the 8920A and 8921A.
603-3.
SPECIFICATIONS
603-4. Specifications for the Counter Output Option
are given in Section I of this manual.
603-5.
INSTALLATION
603-6. The Counter Output Option may be installed on
either the 8920A or the 8921A. Install the Counter
Output Option as follows, referring to Figure 603-l.
I. Remove 8920A / 8921 A top cover (see Access
Information).
3. Connect the 3-wire cable (P401) to J401 on the
Main PCB Assembly-Al.
4. Verify operation using the calibration
procedure.
5.
603-7.
OPERATION
603-8. Once installed, the Counter Output Option
requires no operator attention other than ensuring that
no voltage is ever applied to the option's rear panel BNC
output (J402).
603-9.
THEORY OF OPERATION
603-10. As shown in Figure 603-2, the Counter Output
Option utilizes an isolation amplifier, two Schmitt
triggers, pulse transformer and a DC-DC power supply
to provide an isolated output suitable for triggering a
counter. The isolation amp is used as a buffer between
amplifier B's output and the first Schmitt trigger. The
Schmitt trigger drives the pulse transformer with a square
wave at the same frequency as the sine wave input. The
pulse transformer provides isolation between the input
common and output common allowing frequency
sources with as high as 500V common mode voltage to be
measured with the 8921A. The second Schmitt trigger is
used to convert the pulse transformer output to the 100
m V square wave output at the same frequency as the sine
wave input. The DC-DC power supply provides isolated
+5.3V and -6.5V for the second Schmitt trigger.
603-11.
2. Plug Counter Output Option into J 106-1,
J 106-3 of the A2 AC PCB Assembly and
mechanically secure with the three screws provided;
one on the AC Assembly shield and two on the rear
panel.
Replace the shields.
MAINTENANCE
603-12. The following maintenance information covers
three areas; performance testing, calibration and
troubleshooting of the -003 Counter Output Option.
However, before any of these procedures can be started,
603-1
8920A/8921A
14---COUNTER OUTPUT
OPTION (TESTED)
H1 (2)
II
iii
Figure 603-1. Counter Output Option Installation
603-2
8920A/8921 A
+15V
+5.3V
.09- 1V rms
SCHMITT
TRIGGER
JlSlJ1_
r
11
L
...J
OUTPUT TO
J
_6_5rREARPANEL
-oc:Dc- l
r
+5V
A A
,..., ...., ,..., , 100 mv P-P
L..J L..J L..J
@son
,,___ _.__ _,__..~-S-CH-M-l-T-T~
TRIGGER
I
-PULSE- -,
TRANSFORMER - , - : :
II
POWER
I
L
S~UPPLY
I
+5.3V
-6.5V
-
...J
Figure 603-2. Counter Output Option Simplified Schematic
the calibration of the mainframe instrument (8920A or
8921 A) must be successfully completed. The table of
recommended test equipment in Section 4 lists all of the
equipment necessary to check, calibrate and
troubleshoot the mainframe instrument. Any additional
equipment required to check and calibrate the -003
Option is listed in Table603-l. If you are unable to obtain
the recommended test equipment insure that the
substitute has equal or better performance specifications.
I. Connect the AC Calibrator, UUT, oscilloscope
and termination as shown in Figure 603-3.
2. Set the AC Calibrator to its lOV range, set the
UUT to AC FUNCTION, VOLTS DISPLAY
MODE and 2V range, HOLD and set the
oscilloscope's ti,me base to 0.2 sec/div and Vert on
50 mV/div.
NOTE
For the following procedures the 8920A and
8921A will be referred to as the UUT (Unit
Under Test).
Table 603-1. Recommended Test Equipment
EQUIPMENT
QTY
NOMENCLATURE
REQUIREMENT
RECOMMENDED
EQUIPMENT
1
Universal CounterTimer
100 Hz-20 MHz
Fluke 1953A
2
Oscilloscope
DC to 200 MHz
1.8 ns
Tektronix 475
603-13.
Performance Test
603-14. The following procedure will verify that the
Counter Output Option is operating within the
specification limits stated in Section 1.
3. Referring to Table 603-2, change input to UUT
as indicated and note that display values are within
indicated tolerances.
4. Disassemble the setup as shown in Figure 603-3
and connect the SG503, UUT, and Universal
Counter-Timer and terminations, as shown in
Figure 603-4.
5. Set the SG503 to its 10-25 MHz range, set the
Universal Counter-Timer for frequency ratio
measurement with 10 sec gate interval, and set the
UUT to AC FUNCTION, VOLTS DISPLAY
MODE and 200 mV RANGE HOLD.
6. Referring to Table 603-3, change input to UUT
as indicated and note that display values are within
indicated tolerances.
603-3
8920A/8921A
(I:::> BANANA TO
BNC ADAPTER
AC CALIBRATOR
FLUKE 5200A
UUT
(FRONT)
COUNTER
OUTPUT
--~~~~~--.
OSCILLOSCOPE
TEKTRONIX 475
D
5on
TERM
UUT
(REAR)
[!:::>-THIS ADAPTER IS NOT REQUIRED
WHEN USING THE 8921A
Figure 603-3. Counter Output Performance Set-Up
UNIVERSAL
COUNTER TIMER
FLUKE 1953A
LEVELED
SINE WAVE
GENERATOR
TEK. SG503
5on
UUT
(REAR)
TERM
BNC TO GR
ADAPTER
UUT
(FRONT)
GRTOBNC--'--~i:::;::;::J
ADAPTER
(t:>--1F THE 8921A IS USED A BANANA TO BNC ADAPTER
WILL ALSO BE REQUIRED
Figure 603-4. Counter Output Performance Test Set-Up
603-4
......
--~~~~~~~~~~~~~~~~~~~~~~~~
8920A/8921A
procedure then the option will require troubleshooting.
If, however, the limits are met then we recommend that
the performance test be completed as a check.
Table 603-2. Counter Output Amplitude
AC CALOSCILLOSCOPE
UUT
I BRATOR DISPLAY DISPLAY ±20%
OUTPUT
COMMENTS
1.9V,
1 kHz
1.900
Observe 100 mV Adjust calibrator
output to obtain
squarewave
UUT display.
0.18V
1 kHz
.180
Observe 100 mV Adjust calibrator
squarewave
output to obtain
UUT display.
I. Remove the U UTs top cover and measure the
inverter power supply voltages;
MEASURE BETWEEN
C413 and Ground
SG503
OUTPUT
UUT
DISPLAY
COUNTER-TIMER
DISPLAY ±1
DIGIT
2. Connect the AC Calibrator, UUT, oscilloscope
and terminations as shown in Figure 603-3.
COMMENTS
18mV,
20MHz
18.0
1.00000
Adjust the SG503
output to obtain
UUT display.
180 mV,
20MHz
180.0
1.00000
Adjust the SG503
output to obtain
UUT display.
603-15.
5.0V, ±0.3V
-6.2V, ±0.3V
C4 I4 and Ground
Table 603-3. Counter Output Frequency Response
DVM DISPLAY
3. Set the AC Calibrator to its IV range at I 0 kHz,
set the oscilloscope time base to 20 usec/ div. and
Vert to 50 mV /div. and set the UUT to AC
FUNCTION, VOLTS DISPLAY MODE and 2V
range HOLD.
4. Apply 180mV/10 kHz from the AC Calibrator
to the input of the UUT. Using the oscilloscope
chl.!ck tm: UUT's counter output and adjust R404
until a symmetrical square wave is obtained. The
amplitude of the square wave should be 100 mV
peak, ±20% and must not change as the input to the
UUT is increased up to 18V.
Calibration
603-16. The Counter Output Option should be
calibrated when it is first installed or if the limits, as stated
in the performance test cannot be met. Use the following
procedure to calibrate the Counter Output Option. If it is
not possible to obtain the limits as stated in the following
5. Disassemble the set up as shown in Figure 6033 and connect the SG503, UUT, Universal CounterTimer and terminations as shown in Figure 603-5.
LEVELED
SINE WAVE
GENERATOR
TEK. SG503
UNIVERSAL
COUNTER TIMER
FLUKE 1953A
UUT
(REAR)
50!1
TERM
BNC TO GR
ADAPTER
20dB ATT
UUT
(FRONT)
[I:>- IF THE 8921A IS USED A BANANA TO BNC
ADAPTER WILL ALSO BE REQUIRED
Figure 603-5. Calibration Set-Up
603-5
8920A/8921A
6. Set the SG503 to its 10-25 MHz range, set the
Counter-Timer for frequency ratio measurement
with a 10 sec gate interval and set the U UT to AC
FUNCTION, VOLTS DISPLAY MODE and 200
mV range HOLD.
7. Select a 20 MHz output on the SG503 and
adjust its amplitude with the vernier control until
the UUT reads 18.0 mV. At this point, the CounterTimer should display a stable reading of 1.00000 ±I
digit.
8. Reduce the output amplitude of the SG503
until the Counter-Timer display limit of step 7
cannot be met.
603-17.
Troubleshooting
603-18. Table 603-4 should be completed ON LY if the
performance test and calibration procedure indicate the
the -003 Counter Output Option IS NOT operating
correctly. This table includes voltage levels and
waveforms of a properly functioning-003 Option. If you
are unable to obtain any value (± 15%) then you should
replace the defective component and repeat the entire
troubleshooting procedure. However, if all values are
obtained then the performance test and calibration
procedure must be repeated.
603-19.
LIST OF REPLACEABLE
PARTS
9. Adjust R404 until the Counter-Timer display
limit of step 7 is met.
IO. Repeat steps 8 and 9 until the Counter-Timer
display limit can be met at the lowest possible input
level.
603-20. A list of replaceable parts for the Counter
Output Option is given in Table 603-5 and shown in
Figure 603-6. Refer to Section 5 of this manual for
ordering information.
Table 603-4. Counter Output Option Troubleshooting
1.
Using the 8020A or any compatible 3 1/2 digit meter, measure the following supply voltages.
2.
DVM DISPLAY
(8020A)
+15
MEASURE BETWEEN HIGH
TERMINAL AND LOW
TERMINAL
U401-1 and Input Common*
+15.00, ±0.1V
-15
U401-6 and Input Common*
-15.00 ±0.2V
+5
T402-2 and Input Common*
+5.00 ±0.25V
+5.3
U401-1 and Chassis Ground*
+5.3 ±0.3V
-6.5
U401-6 and Chassis Ground*
-6.5±0.3V
SUPPLY VOLTAGE
Using an oscilloscope (with x10 probe) Tek 475 or equivalent, check the following points for the indicated
waveforms.
MEASURE BETWEEN HIGH
TERMINAL - LOW TERMINAL
SCOPE DISPLAY
T402-1 and Input Common*
T402-3 and Input Common*
2V/DIV-10 µs/DIV
T402-6 and Input Common*
0 ---l-+-+-+--+---+-+--__,1-+---1--
T402-8 and Input Common*
2V/DIV - 10 µs/DIV
603-6
8920A/8921A
Table 603-4. Counter Output Option Troubleshooting (cont)
2a.
Using Fluke 5200A or equivalent, apply 1V/10 kHz signal to input of UUT.
SCOPE DISPLAY
MEASURE BETWEEN HIGH
TERMINAL - LOW TERMINAL
Gate of 0401A and Input Common*
.2/DIV -10µs/DIV
Drain of 04018 and Input Common*
U401-3 and Input Common*
.2V/DIV -10µs/DIV
U401-4 and Input Common*
0
c
L
-
50 mV/DIV -10µs/DIV
U401-9 and Input Common*
0
[, l [
1V/DIV -10µs/DIV
T401 input and Input Common*
.5V/DIV -10 µs/DIV
603-7
8920A/8921 A
Table 603-4. Counter Output Option Troubleshooting (cont)
MEASURE BETWEEN HIGH
TERMINAL-LOW TERMINAL
SCOPE DISPLAY
T401 output and Chassis Ground*
.5V/DIV -10µs/DIV
U402-4 and Chassis Ground*
0
------!-·---.5V /DIV - 10 µs/DIV
U402-9 and Chassis Ground*
2V/DIV -10,US/DIV
J402 and Chassis Ground*
100 mV /DIV - 10 µs/DIV
603-8
*Input Common=
"¢ see schematic at end of this manual, Section 8.
*Chassis Ground=
'+ see schematic at end of this manual, Section 8.
5.
Press the 8920A dB/VOL TS switch to the dB position then the REL/dBm switch to the REL position. The
8920A display will be ±0.00 dB.
6.
Select the 20 volt range on the DVM.
7.
Use the decade switch on the ac source to increase the 8920A input ot the levels indicated in Table 604-1.
Note the DVM and 8920A displays to be within the tolerances given
8920A/8921A
Table 603-5. Counter Output Option PCB Assembly
ITEM
NO.
DESCRIPTION
FLUKE
STOCK
NO.
MFG
SPLY
CODE
MFG PART NO.
OR TYPE
TOT REC USE
QTY QTY COE
1
5
1
REF
REF
-003
C401
C402
C403
C404
COUNTER OUTPUT OPTION
CAP,CER, 0.22UF
CAP,CER,430PF +/-5%,500V
CAP,CER, 0.22UF
CAP,CER, 0.22UF
OPTION
ORDER -003
309849 71590 CW30C2241K
177980 72136 DM15F431J
309849 71590 CW30C2241K
309849 71590 CW30C2241K
C406
C407
C408
C409
C410
CAP,TA,47UF +/-20%,20V
CAP,CER,0.005UF +/-20%,100V
CAP,CER, 0.22UF
CAP,CER,0.01UF +/-20%,100V
CAP,CER, 0.22UF
348516
175232
309849
149153
309849
56289
56289
71590
56289
71590
196D476X0020TE4
C023B101E502M
CW30C2241K
C023B101F103M
CW30C2241K
1
1
REF
1
REF
C411
C412
C413
C414
C415
CAP,TA,220UF +/-20%,10V
CAP,TA,220UF +/-20%,10V
CAP,CER,4.7UF +/-20%,50V
CAP,CER,4.7UF +/-20%,50V
CAP,CER,300PF,3KV
474288 56289
474288 56289
363721 56289
363721 56289
485250 56289
196D227X0010TE4
196D227X0010TE4
196D475X0050PE4
196D475X0050PE4
C028B02E301M
2
REF
2
REF
1
CR401
CR402
CR403
CR404
CR405
DIODE,SI,HI-SPEED,SWITCH
DIODE,SI,BI-SPEED,SWITCH
DIODE,SI,HI-SPEED,SWITCH
DIODE,SI,HI-SPEED,SWITCH
DIODE,SI,HI-SPBED,SWITCH
203323 07940
203323 07940
203323 07940
203323 07940
203323 07940
1N4448
1N4448
1N4448
1N4448
1N4448
7
REF
REF
REF
REF
CR406
CR407
H1
J402
L401
DIODE,SI,HI-SPEED,SWITCB
DIODE,SI,HI-SPEED,SWITCH
SCREW, 4-40 X 1/4 SST
CONN,BNC,FEMALE
CHOKE,6 TURN
203323 07940 1N4448
203323 07940 1N4448
256156 73734 23022
152033 95712 30355-1
320911 89536 320911
REF
REF
2
1
3
L402
L403
L404
MP1
MP2
CHOKE, 6 TURN
CHOKE,6 TURN
INDUCTOR SHEILDED,0.27UH
SHIELD
SHIELD
320911
320911
313031
475491
475483
320911
320911
MR-0.27
475491
475483
REF
REF
1
1
1
MP3
MP7
MP8
MP9
MP10
SHIELD
COVER
COVER
BUS WIRE #20
BRACKET
475376 89536
475509 89536
475400 89536
115469 89536
456723 89536
475376
475509
475400
115469
456723
1
1
1
AR
1
MP11
P106
P401
Q401
Q402
SHIELD
POST,CONTACT
CABLE,-003 OPTION
XSTR,DUAL FET
XTSR,SI,NPN
475384
474809
486670
454637
272237
89536
22526
89536
89536
89536
475384
65505-136
486670
454637
272237
Q403
R402
R403
R404
R405
XTSR,SI,NPN
RES,MF,1K +/-1%,1/8W
RES,MF,1K +/-1%,1/8W
RES,VAR,100K +/-10%,1/2W
RES,COMP,20K +/-5%,1/4W
272237
168229
168229
369520
221624
89536
91637
91637
89536
01121
272237
CMF551001F
CMF551001F
369520
CB2035
R406
R407
R408
R409
R410
RES,COMP,9.1K +/-5%,1/4W
RES,COMP,51,+/-5%,1/4W
RES,COMP,1.2K +/-5%,1/4W
RES,COMP,15K +/-5%,1/4W
RES,COMP,220 +/-5%,1/4W
193318
221879
190371
148114
147959
01121
01121
01121
01121
01121
CB9125
CB5105
CB1225
CB1535
CB2215
89536
89536
24859
89536
89536
2
IT:>
1
3
1
1
2
1
1
REF
2
REF
1
1
1
1
2
1
1
1
603-9
8920A/8921 A
Table 603-5. Counter Output Option PCB Assembly (cont)
ITEM
NO.
DESCRIPTION
FLUKE
STOCK
NO.
MFG
SPLY
CODE
MFG PART NO.
OR TYPE
TOT REC USE
OTY OTY COE
R411
R412
R413
R414
R415
RES,COMP,47 +/-5%,1/4W
RES,COMP,680 +/-5%,1/4W
RES,COMP,470 +/-5%,1/4W
RES,COMP,5.1K +/-5%,1/4W
RES,COMP,1K +/-5%,1/4W
147892 01121
148007 01121
147983 01121
193342 01121
148023 01121
CB4705
CB6815
CB4715
CB5125
CB1025
1
2
1
1
R416
R417
T401
T402
0401
RES,COMP,680 +/-5%,1/4W
RES,COMP,51,+/-5%,1/4W
TRANSFORMER
TRANSFORMER
IC,LIN,HI-SPEED ANALOG VOL COMPARTOR
148007
221879
461863
472798
386920
01121
01121
89536
89536
12040
CB6815
CB5105
461864
472498
LM361N
REF
REF
1
1
0402
IC,LIN,HI-SPEED ANALOG VOL COMPARATOR
386920
12040
LM361N
REF
,
2
1
!}:::>Refer to Figure 603-1
r.@
c:::J U402
'C410
Figure 603-6. Counter Output Option PCB Assembly
603-10
J40'2.
8920A/8921A
-004 Option
Logarithmic Analog Output
604-1.
INTRODUCTION
604-2. The Logarithmic Analog Output Option
provides a non-isolated output voltage which varies
continuously as the logarithm of therms input. Scaling is:
OV de output corresponds to 0 dB which is 200 uV rms
input to the 8920A while 13. l V de output = 131 dB =
700V rms input. A continuous frequency response of
circuits with a wide dymnamic output is easily plotted on
an XY recorder using this option. The option's output is
non-isolated, and is available only on the 8920A.
604-3.
SPECIFICATIONS
604-4. Specifications for the Logarithmic Analog
Output Option are given in Section I of this manual.
604-5.
INSTALLATION
604-6. The Logarithmic Analog Output Option may be
installed on the 8920A only. Install the option as follows,
referring to Figure 604-1.
I.
Remove the top cover (see Access Procedures).
2. Remove the plate located at the top of the
8920's rear panel.
3. Install the Banana Jack plate with the red
banana jack to the right (when \ ie\\ ing the h920A
from the rear).
4. Secure the Logarithmic Analog Output
Assembly to the top of the transformer bracket (see
Figure 604-1) using the two screws provided.
5. Plug P501 into J501 (located on the Main PCB
Assembly).
6. Solder the Logarithmic Analog Output
Assembly's red output lead to the red banana jack
and the black lead to the black banana jack.
604-5.
OPERATION
604-6. Once installed, the Logarithmic Analog Output
Option re4uires no operator attention other than
en~uring that no voltage is ever applied to the option's
output banana jacks.
604-7.
THEORY OF OPERATION
604-8. The Logarithmic Analog Output Option,
illustrated in Figure 604-2, utilizes the logarithmic
characteristics of a P-N junction to develop an output
proportional to the logarithm of the de input from the
thermal sensor.
604-9. The de output voltage of the thermal sensor
develops a collector current in one-half of a dual
transistor. The resulting emitter base voltage is compared
to the reference Vbe of the second half and scaled up
accordingly. This voltage in turn develops a current
which is summed with range information to produce the
logarithmic output.
604-10 The output of the sensor covers one decade(. I
to IV) in Jny one range. Scaling is such that one decade
corresponds to 2V or 20 dB (.1 V = 1 dB) at the output. "O"
dB corresponds to 200 uV and each range increase
produces an additional 2V at the output. Transients
during range changes are eliminated by a sample and
hold circuit.
604-11.
MAINTENANCE
604-12. The following maintenance information covers
three areas; performance testing, calibration and
troubleshooting of the -004 Logarithmic Analog Output
Option. However, before any of these procedures can be
started the calibration of the mainframe instrument
(?920A) must be successfully completed. The table of
recommended test equipment in Section 4 lists all of the
604-1
8920A/8921 A
{ H 1 (SAME AS -0031
REMOVE DOU OPTION
SCREWS TO INSTALL MP1
l
Figure 604-1. Logarithmic Analog Output Option Installation
604-2
8920A/8921A
RANGE
INFORMATION
t--JV\Ar-__.......~
OUTPUT
SAMPLE AND
HOLD
LOGARITHMIC
OUTPUT
DC INPUT
FROM
THERMAL
SENSOR
+15V
Figure 604-2. Logarithmic Analog Output Option Simplified Schematic
equipment necessary to calibrate the mainframe
instrument. No additional equipment is required to
check, calibrate or troubleshoot the -004 Option.
604-13.
Performance Test
604-14. The following procedure will verify that the
Logarithmic Analog Output Option is operating within
the specification limits stated in Section I.
Table 604-1. Performance Test
8920A INPUT
8920A DISPLAY
DVM DISPLA V*
10 mV, 500 Hz
20.00 ±0.25 dB
3.4 ±0.24V
100 mV, 500 Hz
40.00 ±0.25 dB
5.4 ±0.24V
1V, 500 Hz
60.00 ±0.25 dB
7.4 ±0.24V
10V, 500 Hz
80.00 ±0.25 dB
9.4 ±0.24V
100V, 500 Hz
100.00 ±0.25 dB
11.4 ±0.24V
* The tolerance limit represents total system
I. Select the AC function, LO RANGE ENABLE
and AUTO range on the 8920A.
Apply 1.0 mV, 500 Hz to the 8920A INPUT
~
connector.
3. Select the DC Volts function and 2 Volt range
on the DVM; connect it to the LOGARITHM IC
ANALOG OUTPUT jacks on the rear panel of the
8920A.
4. Adjust the vernier control on the AC source of
a voltage reading on the DVM of 1.400 ±.002 Vdc.
5. Press the 8920A dB/ VOL TS switch to the dB
position then the REL/ dBm switch to the REL
position. The 8920A display will be ±0.00 dB.
fi.
inaccuracies.
604-15.
I
Calibration
604-16. The Logarithmic Analog Option should be
calibrated when it is first installed or if the limits as stated
in the performance test cannot be met. Use the following
procedure to calibrate the Logarithmic Analog Option. If
it is not possible to obtain the limits as stated in the
following procedure then the option will require
troubleshooting. If, however, the limits are met then we
recommend that the performance test be completed as a
check.
I. Remove the 8920A's top cover, and set up the
test equipment as shown in Figure 604-3.
Select the 20 volt range on the DVM.
7. Usc the decade switch on the ac source to
increase the 8920A input to the levels indicated in
Table 604-1. Note the DVM and 8920A displays to
be within the tolerances given.
2. Set the 8920A to AC, AUTO and select the LO
RANGE ENABLE. Now apply 1.0 mV ac, 500 Hz.
Observe the option's output to be approximately
1.4 ±0.2V de. (TP504 1s Ground, TP503 is the
option's output.)
604-3
8920A/8921 A
SHIELDED
CABLE
8020A
AC CALIBRATOR
(5200A)
8920A
(FRONT)
0
BANANA
TOBNC
ADAPTER
NOTE:
THE OUTPUT "HIGH" IS ON
THE RIGHT WHEN THE 8920A
IS VIEWED FROM THE REAR.
8920A
(REAR)
Figure 604-3. Logarithmic Analog Output Option Test Set-Up
3. Apply 20.0 m V, 500 Hz to the 8920A and select
its HOLD RANGE. Monitor the voltage at TP502
and adjust R50 I for a 0 ±0.0005 Vde on the D MM.
4. Monitor TP501 and note the magnitude and
polarity of the offset from OV to the nearest 0.0 IV.
5. While still monitoring TP501 adjust R5 I 2 for a
reading of -JOY +OFFSET of step 3 ±0.0IV.
Example:
Initial Offset
-.03V
+.14V
Final Reading
-IO -.03
-IO +.14
= -10.03 ±.OlV
= -9.86 ±.OIV
6. Monitor TP503 and note the offset from
+6.00V to the nearest 0.01 V.
7. Decrease the input to 100 m V, 500 Hz and
observe that the DMM reads +5.4V ±0.0IV plus
the offset noted in step 5.
604-4
8. Decrease the input to 20 m V, 500 Hz and
observe that the DMM reads +4.00V ±0.01 V plus
the offset noted in step 5.
604-17.
Troubleshooting
604-18. To troubleshoot the -004 Option read the
theory of operation for this option and then check the
actual voltage levels against those indicated on the -004
schematic, located in Section 8. If there are any
discrepancies, simply replace the defective component
and repeat the performance test and calibration
procedure.
604-19.
PARTS
LIST OF REPLACEABLE
604-20. A list of replaceable parts for the Logarithmic
Analog Output Option is givet1 in Table 604-2 and shown
in Figure 604-4. Refer to Section 5 of this manual for
ordering information.
8920A/8921A
Table 604-2. Logarithmic Analog Output Option PCB Assembly
MFG
SPLY
CODE
DESCRIPTION
FLUKE
STOCK
NO.
-004
C501
C502
C503
C504
LOGARITHMIC ANALOG OUTPUT OPT.,FIG 606-4
CAP,CER,1000PF +/-10%,500V
CAP,CER,100PF +/-10%,1000V
CAP,MYLAR,2.0UF +/-20%,100V
CAP,TA,22UF +/-20%,15V
ORDER
357806
105593
334185
423012
C505
C506
CR501
J501
J502
CAP,ELECT,TA,2.2UF +/-10%,20V
CAP,ELECT,TA,22UF +/-10%,20V
DIODE,HI-SPEED,SWITCH
BANANA JACK,BLACK
BANANA JACK,RED
160226 56289
160226 56289
203323 07910
162073 74970
162065 74970
150D225X9020A
150D225X9020A
1N4448
108-0903-001
108-0902-001
MP1
P501
Q501
Q502,
R501
COVER PLATE, LOG ANALOG OPTION
CABLE,LOGARITHMIC ANALOG OUTPUT
XSTR,DUAL,SI,NPN
XSTR,FET,JNCT,N-CHANNEL
RES,VAR,100K +/-10%,1/2W
456772 89536
486688 89536
295717 24355
376475 89536
369520 89536
456772
486688
AD811-00/17
376475
369520
1
1
1
1
1
R505
R506
R507
R508
R509
RES,MF,10K +/-1%,1/8W
RES,COMP,15M +/-5%,1/4W
RES,COMP,10K +/-5%,1/4W
RES,MF,37.5K +/-0.1%,1/8W
RES,MF,75K +/-0.1%,1/8W
168260 91637
381491 01121
148106 01121
!142947 91637
370916 91637
CMF551002F
CB1565
CB1035
CNF553752B
CMF557502B
1
1
1
1
1
R510
R511
R512
R513
R514
RES,MF,150K +/-0.25%,1/8W
RES,MF,100K +/-0.1%,1/8W
RES,VAR,20K +/-10%,1/2W
RES,MF,150K +/-0.25%,1/8W
RES,COMP,47K +/-5%,1/4W
442707
370775
335760
442707
148163
91637
91637
89536
91637
01121
CMF551503C
CMF551003B
335760
CMF551503C
CB4735
2
1
1
REF
1
R515
R516
R518
R519
R520
RES,MF,158K +/-1%,1/8W
RES,MF,994 +/-2%,1/2W
RES,MF,20K +/-0.1%,1/8W
RES,MF,1.5M +/-1%,1/2W
RES,COMP,1K +/-5%,1/4W
237214 91637
477018 89536
446443 91637
284976 91637
148023 01121
CMF551583F
477018
CMF552002B
CMF651504F
CB1025
1
1
1
1
1
R524
R525
TP501
TP502
TP503
RES,MF,100K +/-5%,1/8W
RES,MF,143K +/-1%,1/8W
CONNECTOR POST
CONNECTOR POST
CONNECTOR POST
248807
291336
379438
379438
379438
91637
91637
0779
0779
0779
CMF551003F
CMF551433F
1-87022-0
1-87022-0
1-87022-0
1
1
4
REF
REF
TP504
U501
U502
W502
CONNECTOR POST
IC,C-MOS,HEX BUFFER/INVERTER
IC,LINEAR,OP AMP
WIRE ASSEMBLY
379438
381848
402669
488163
0779
02735
02735
89536
1-87022-0
CD4047AE
CA324E
488163
REF
1
1
1
ITEM
NO.
MFG PART NO.
OR TYPE
OPTION
-004
56289 C016B102G102K
71590 DD-101
14752 230B1B105
56289 196D226X00154A1
TOT REC USE
O.TY O.TY COE
1
1
1
1
1
2
REF
3
1
1
1
~
CI>1
1
1
1
1
1
1
!]:::::> Refer to Figure 604-1
604-5
8920A/8921A
-amr
0
-@D-
CR503
~
<illD-
-man-
--a:::J-
tm
-mmJ-
~R502
~·· 1. .__ __.~~ o~
0
c_s_o_3_
~
L.--------J~
W503
~
W©
Figure 604-4. Logarithmic Analog Output Option PCB Assembly
604-6
Section 7
General Information
7-1. This section of the manual contains generalized
user information as well as supplemental information to
the List of Replaceable Parts contained in Section 5.
REV.5
7/89
7-1
Federal Supply Codes for Manufacturers
09816
Weslemlann Wilhelm Augusta-Anlage
Mannheim-Nackarau Gennany
S0482
Sony Corp.
Tokyo, Japan
S3774
Oshino Electric Lamp Woiks
Tokoyo, Japan
OAD86
INGeneral
El Paso, TX
OAE89
Autosplice Inc.
Woodside, NY
OBW21
Noritake Co. Inc.
Burlington, MA
OANFO
Topaz Semiconductor Inc
San Jose, CA
ODSM7
Conductive (Pkg) Containers Inc.
Brookfield, WI
OCLN7
Emhart Fastening Group
Shelton, CT
OFB81
S-Mos Systems Inc.
San Jose, CA
01101
Wabash Inc
(Formerly Wabash Magnetics)
Wabash, IN
O'lh91
Parl<er-Hannifin Corp.
0-RingDiv
Lexington, KY
01121
Allen Bradley Co.
Milwaukee, WI
02735
RCA-Solid State Div.
Somerville, NJ
01281
TRW Electronics & Defense Sector
RF Devices
Lawndale, CA
03296
Nylon Molding Corp.
Monrovia, CA
24655
Genrad,INC.
Concord, MA
01537
Motorola Communications &
Electronics Inc.
Franklin Park, IL
03445
Lercon Electronics Inc
Burbank, CA
05236
Jonathan Mfg. Co.
Fullerton, CA
03508
General Electric Co.
Semiconductor Products
&Batteries
Aubum,NY
05245
Corcomlnc.
Libertyville, IL
01686
RCL Electronics/Shallcross Inc.
Electro Components Div.
Manchester, NH
01884
Sprague Electric Co.
(Now 56289)
01961
Varian Associates Inc.
Pulse Engineering Div.
Convoy, CT
02111
Spectrol Electronics Corp.
City of Industry, CA
00213
Nytronics Comp. Group Inc.
Darrlingon, NC
02114
Ampcrex Electronic Corp.
Ferrox Cube Div.
Saugerties, NY
00779
AMP, Inc.
HarrisbU?g, Pennsylvania
00853
Sangamo Weston Inc
Components Div
Pickens, NC
01091
Allied Plastics Co.
Los Angeles, CA
7-2
05173
General Radio
NY,NY.
Replaced by:
01526
Genicom
Waynesboro, VA
00199
Marcon Electronics Corp
Keamy,NJ
00686
Film Capacitors Inc.
Passaic, NJ
04946
Standard Wire and Cable
Rancho Dominquez, CA
02799
Arco Electronics Inc.
Chatsworth, CA
01963
Ch=y Electrical Products Corp
Waukegan, IL
00656
Aerovox Corp.
New Bedford, MA
04713
Motorola Inc.
Semiconductor Group
Phoenix, AZ
01295
TX Instruments Inc.
Semiconductor Group
Dallas, TX
OFFPl
Eveiready LID
Ever Ready Special Battery Div.
Dawley Telford Salop UK
00327
Welwyn International Inc.
Westlake, OH
02768
TIW (IL Tool Worl<s)
Fastex Division
Des Plaines, IL
04423
Telonic Berkley Inc.
Laguna Beach, CA
02131
General Instrument Corp.
Government Systems Div.
Westwood, MA
02395
Sonar Radio Corp.
Hollywood, FL
02533
Leigh lnsLruments Ltd.
Frequency Control Div.
Don Mills, Ontario, Canada
02606
Fenwa!Labs
Division ofTravenal Labs
Morton Grove, IL
02660
Bunker Ramo-Eltra Corp.
Amphenol NA Div.
Broadview, IL
03797
Genisco Technology Corp.
Eltronics Div.
Rancho Dominquez, CA
03877
Gilbert Engineering Co.Inc
Incon Sub of Transitron
Electronic Corp.
Glendale, AZ
03888
KDI Electronics Inc.
Pyrofilm Div.
Whippany, NJ
03911
Clairex Corp.
Clairex Electronics Div.
Mount Vernon, NY
03980
Muirltead Inc.
Mountainside, NJ
04009
Cooper Industries, Inc.
Arrow Hart Div.
Hartford, CT
04217
Essex International Inc.
Wire & Cable Div.
Anaheim, CA
05276
ITT Pomona
Electronics Div.
Pomona, CA
05277
Westinghouse Elec. Corp.
Semiconductor Div.
Youngwood, PA
05347
lntronixlnc
Grand Junction, CO
05397
Union Carbide Corp.
Materials Systems Div.
Cleveland. OH
05571
Sprague Electric Co.
(Now56289)
05574
Viking Connectors Inc
Sub of Criton Corp.
Chatsworth, CA
05791
LYN-TRON
Burbank, CA
05820
EG & G Wakefield Engineering
Wakefield, MA
04221
Midland-Ross Corp.
MidtcXDiv.
N. Mankato, MN
05839
Advance Electrical
Chicago, IL
04222
AVXCorp.
AVX Ceramics Div.
Myrtle Beach, SC
05972
Loctite Corp.
Newington, CT
Federal Supply Codes for Manufacturers (cont)
06001
Gcnera1 Elecuic Co.
Electric Capacitor Product
Section
Columbia, SC
06141
Fairchild Weston Systems Inc.
Data Systems Div.
Sarasota, FL
06192
La Deau Mfg. Co.
Glendale, CA
06229
Electrovcrt Inc.
Elmsfotd, NY
06383
Panduit Corp.
Tinley Park, IL
06473
Bunker Ramo Coi:p.
Amphenol NA Div.
SAMS Ope111tion
Chatsworth, CA
06540
Mite Corp
Amatom-E!ectrical Div
06555
Beede Electrical Instrument
Penacook, NH
06665
Precision Monolithics
Sub ofBoums Inc.
Santa Clara, CA
06666
General Devices Co. Inc.
INpo!is, IN
06739
Electron Corp.
Littleton, CO
06743
Gould Inc.
Foil Div.
Eastlake, OH
06751
Components Inc.
SemcorDiv.
Phoenix, AZ
06776
Robinson Nugent Inc.
New Albany, IN
06915
Richco Plastic Co.
Chicago, Il.
06961
Vemitron Colp.
Piezo Electric Div.
Bedford, OH
06980
EIMAC
(See Varian)
San Carlos, CA
07047
Ross Milton Co., The
Southampton, PA
08111
MF Electronics
New Rochelle, NY
07138
Westinghouse Electric Corp.
Industrial & Government
Tube Div.
Hoiseheads, NY
08235
Industro Transistor Corp.
Long Island City, NY
07233
Benchmarlt Technology Inc.
City of Industry, CA
07239
Biddle Instruments
Blue Bell, PA
07256
Silicon Transistor Colp.
Sub of BBF Inc.
Chclmsford, MA
07261
Avnet Colp.
Culver City, CA
07263
Faiichild Semiconductor
North American Sales
Ridgeview, CT
07344
Bircher Co. Inc., The
Rochester, NY
07374
OptronCoi:p
Woodbridge, CT
07557
Campion Co. Inc.
Philadelphia, PA
07597
BumdyCoi:p.
Tape/Cable Div.
Rochester, NY
07716
TRW Inc. (Can use 11502)
IRC Fixed Resistois/
Burlington
Burlington, vr
07792
Lerma Engineering Colp.
Northampton, MA
07810
Bock Corp.
Madison, WI
07910
Teledyne Semiconductor
Mtn. View, CA
07933
Raytheon Co.
Semiconductor Div.
Mountain View, CA
08FG6
Calmos Systems Inc.
Kanata, Ont. Canada
080A9
Dallas Semiconductor
Dallas, TX
08261
Spectra-Strip
An Eltra Co.
Garden Grove, CA
08445
Electri-Cotd Mfg., Inc
Westfield, PA
08530
Reliance Mica Corp.
Brooklyn, NY
08718
ITT Cannon Electric
Phoenix Div.
Phoenix, AZ
08806
General Electric Co.
Minature Lamp Products
Cleveland, OH
08863
Nylomatic
Fallsington, PA
08988
Skottie Electronics Inc.
Archbald, PA
09021
Aircolnc.
Airco Electronics
Bradford, PA
09023
Comell-Dublier Electronics
Fuquay-Varina, NC
09214
General Electric Co.
Semiconductor Products Dept.
Aubum,NY
09353
C and K Components Inc.
Newton, MA
09423
IB715
(United Shoe & Nylock Coi:p)
-Nylock Fastener Corp.Paramus, NJ
10059
Barker Engineering Corp.
Kenilworth, NJ
10389
IL Tool Wozks Inc.
Licon Div.
Chicago, IL
11236
CTS Coi:p.
Resistor Products Div.
Beme,IN
11237
CTS Coi:p of CA
Electro Mechanical Div.
Paso Robles, CA
11295
ECM Motor Co.
Schaumburg, IL
11358
Columbia Broadcasting System
CBS Elertrccic Div.
NewburY£<>It, MA
11403
Vacuum Can Co.
Best Coffee Maker Div.
Chicago, IL
11502 (can also use 35009)
TRW Inc.
TRW Resistive Products Div.
Boone, NC
11503
Keystone Columbia Inc.
Freemont, IN
11532
Teledyne Relays Teledyne
Industries Inc.
Hawthorne, CA
11711
General Instrument COip.
Rectifier Div.
Hicksville, NY
Scientific Components Inc.
Santa Barbara, CA
11726
Qualidyne Coi:p.
Santa Clara, CA
09922
BumdyCorp.
Norwalk, CT
12014
Chicago Rivet & Machine Co.
Naperville, Il.
09969
Dale Electronics Inc.
Yankton, SD
12020
Ovenaite
Div. ofElectronic Technologies
Charlottesville, VA
09975
Burroughs Coip.
Electronics Components
Detroit, MI
IA791
LFE Electronics
Danveis,MA
12038
Simco
(Div of Ransburg Coip)
Hatfield, PA
12040
National Semiconductor Corp.
Danbury, CT
7-3
Federal Supply Codes for Manufacturers (cont)
12060
Diodes Inc.
North.ridge, CA
13050
Pouer Co.
Wesson, MS
12136
PHC Industries Inc.
Fonnerly Philadelphia Handle Co.
Camden, NJ
13103
Thermalloy Co., Inc.
Dallas, TX
12300
AMF Canada Ltd.
Potter-Brumfield
Guelph, Ontario, Canada
12323
Practical Automation Inc.
Shelton, CT
13327
Solitron Devices Inc.
Tappan, NY
13511
Bunker-Ramo Corp.
Amphenol Cadre Div.
Los Gatos, CA
12327
Freeway Cm:p.
Cleveland, OH
13606
Sprague Electric Co.
(Use56289)
12A06
Elpac Electronics Inc.
Santa Ana, CA
13689
SPS Technologies Inc.
Hatfield, NJ
12443
Budd Co.,The
Plastics Products Div.
Phoenixville, PA
12581
Hitachi Metals Inernational Ltd.
Hitachi Magna-Lock Div.
Big Rapids, MO
13764
Micro Plastics
Flippin, AZ
13919
Burr-Brown Research Coip.
Tucson, AZ
14099
Sem~C01p.
Newbury Park, CA
12615
US Tenninals Inc.
Cincinnati, OH
12617
Hamlin Inc.
LaKe Mills, WI
12673
Wesco Electrical
Greenfie.ld, MA
12697
Clarostat Mfg. Co. Inc.
Dover, NH
12749
James Electronic Inc.
Chicago, IL
12856
MicroMetals Inc.
Anaheim, CA
12881
Metc:Jl Corp.
Edison, NJ
12895
Cleveland Electric Motor Co.
Cleveland, OH
12954
Microsemi Corp.
Components Group
Scottsdale, AZ
12969
Unitrode Corp.
Lexington, MA
7-4
14140
McGray-Edison Co.
Commercial Development Div.
Manchester, NH
14189
Ortronics, Inc.
Orlando, FL
14193
Cal-R-Inc.
Santa Monica, CA
14704
Crydom Controls
(Division of Int Rectifier)
El Segundo, CA
16473
Cambridge Scientific Industries
Div. of Chemed Corp.
Cambridge, MD
14752
Electro Cube Inc.
San Gabriel, CA
16733
Cablewave Systems Inc.
North Haven, CT
14936
General Instrument Corp.
Discrete Semi Conductor Div.
Hicksville, NY
14949
Trompeter Electronics
Chatswonh, CA
15412
Midlothian, IL
15542
Scientific Components Corp.
Mini-Circuits Laboratory Div.
Brooklyn, NY
15636
Elec-Trol Inc.
Saugus, CA
15782
Bausch & Lomb Inc.
Graphics & Control Div.
Austin, TX
15801
Fenwal Eletronics Inc.
Div. of Kidde Inc.
Framingham, MA
15818
Teledyne Inc. Co.
Teledyne Semiconductor Div.
Mountain View, CA
15849
Usecolnc.
(Now88245)
14329
Wells Electronics Inc.
South Bend, IN
16068
International Diode Div.
Harrison, NJ
14482
Watkins-Johnson Co.
Palo Alto, CA
MMI
14655
Cornell-Dublier Electronics
Div. of Federal Pacific
Electric Co. Govt Cont Dept
Newarlc,NJ
17069
Circuit Structures Lab
Burl>ank,CA
17117
Electronic Molding Corp.
Woonsocket, RI
17338
High Pressure Eng. Co. Inc.
OK City, OK
17504
Aluminum Filter Co.
Carpinteria, CA
17545
Atlantic Semiconductors Inc.
Asbury Park, NJ
17745
Angstrohm Precision, Inc.
Hagerstown, MD
17856
Siliconix Inc.
Santa Clara, CA
18178
E G & Gvactee Inc.
15898
International Business
Machines Corp.
Essex Junction, VT
14604
Elmwood Sensors, Inc
Pawtucket, RI
16758
General Motors Corp.
Delco Electronics Div.
Kokomo, IN
Amtron
14301
Anderson Electronics
Hollidaysburg, PA
14552
Microserni Corp.
(Formerly Micro-Semiconductor)
Santa Ana, CA
16742
Paramount Plastics
Fabricators Inc.
Downey, CA
St. Louis, MO
18235
KRL/Bantry Components Inc.
Manchester, NH
18310
Concord Electronics
NewYOJk,NY
16162
Southfield, MI
16245
Conaplnc.
Olean, NY
16258
Space-Lok Inc.
Burl>ank,CA
16352
Codi Corp.
Linden, NJ
16469
MCLinc.
LaGrange, IL
18324
Signetics Corp.
Sacramento, CA
18377
Parlex Corp.
Methuen, MA
18520
Sharp Electronics Corp.
Paramus, NJ
18542
Wabash Inc.
Wabash Relay & Electronics Div.
Wabash, IN
Federal Supply Codes for Manufacturers (cont)
18565
Chomerics Inc.
Woburn, MA
2Y384
North American Philips Lighting Corp.
Van Wert, OH
23732
Tracor Applied Sciences Inc.
Rockville, MD
26402
Lumex,Inc.
Bayshore, NY
18612
Vishay Intertechnology Inc.
Vishay Resistor Products Group
Malvern, PA
20584
Enochs Mfg. Inc.
INpolis, IN
23880
Stanford Applied Engineering
Santa Clara, CA
26629
Frequency Sources Inc.
Sources Div.
Chelmsford, MA
20891
CosarCorp.
Dallas, TX
23936
William J. Purdy Co.
Pamotor Div.
Burlingame, CA
18632
Norton-Chernplast
Santa Monica, CA
186TI
Scanbe Mfg. Co.
Div. of Zero Coip.
El Moote, CA
18736
Voltronics Coip.
East Hanover, NJ
18786
Micro-Power
Long Island City, NY
18927
GTE Products Coip.
Precision Material Products
Business Parts Div.
Titusville,PA
19080
Robinson Electrooics Inc.
San Luis Obispo, CA
19112
Garry Corp.
Langhorne, PA
19315
Bendix Coip., The
Navigation & Control Group
Terl>oro, NJ
19451
Perine Machine Tool Coip.
Kent, WA
21317
Electronics Applications Co.
El Monte, CA
21604
Buckeye Stamping Co.
Columbus, OH
21845
Solitron Devices Inc.
Semiconductor Group
Riven Beach, FL
21847
Aeitech
Now TRW Microwave Inc.
Sunnyvale, CA
21962
Vectron Corp.
Replaced by: S.W. Electronics
24347
Penn Engineering Co.
S. El Monte, CA
24355
Analog Devices Inc.
Norwood, MA
2A444
Genei:al Semiconductor
Industries, Inc.
Tempe, AZ
24546
Bradford Electronics
Bndford,PA
24618
Transcon Mfg.
Now: D.J. Associates Inc.
22526
DuPont, EI DeNemours & Co. Inc.
DuPont Connector Systems
Advanced Products Div.
New Cumberland, PA
24655
Genradlnc.
(Replaced General Radio 05173)
Coocord,MA
22626
Micro Semiconductor
(Now 14552)
24759
Lenox-Fugle Electronics Inc.
South Plainfield, NJ
22670
GM Nameplate
Seattle, WA
24796
AMFinc.
Potter & Brumfield Div.
San Juan Capistrano, CA
22767
m
Semiconductors
Palo Alto, CA
24931
Specialty Connector Co.
Gremwood, IN
22784
Palmer Inc.
Cleveland, OH
24995
ECS
Grants Pass, OR
23050
Product Comp. Coip.
Mount Vernon, NY
25088
Siemen Coip.
Isilen, NJ
23223
CTS Microelectronics
Lafayette, NY
25099
Cascade Gasket
Kent, WA
23237
l.R.C., Inc.
Microcircuits Divison
Philadelphia, PA
25403
Ampexex Electronic Corp.
Semiconductor & Micro-Circuit Div.
Slatersville, RI
2Bl78
Wire Products
Cleveland, OH
23302
S.W. Electrooics & Mfg. Corp.
Cherry Hill, NJ
25435
Moldtronics, Inc
Downers Grove, IL
2K262
Boyd CO!pOllllion
Portland, OR
23730
Mark Eyelet and Stamping Inc.
Wolcott, CT
25706
Daburn Electronic & Cable Corp.
Norwood, NJ
19482
Delta Electronics
Alexandria, VA
19613
MN Mining & Mfg. Co.
Textool Products Dept.
Electronic Product Div.
Irving, TX
19647
Caddock Electronics Inc.
Riverside, CA
19701
Mepco/Centralab Inc.
A N. American Philips Co.
Mineral Wells, TX
26806
American Zelller Inc.
Irvine, CA
27014
National Semiconductor Corp.
Santa Oara, CA
27167
Corning Glass Wodts Coming
Electronics
Wilmington, NC
27264
Molex Inc.
Lisle.IL
27440
Industrial Screw Products
Los Angeles, CA
27494
Staffall, Inc.
Providence, RI
Tn45
Associated Spring Bames Group Inc.
Syncuse, NY
27918
Compooent Parts Corp.
Bellmore, NY
27956
Relcom (Now 14482)
28175
Alpha Metals
Chicago, IL
28198
Positronic Industries
Springfield, MO
28213
MN Mining & Mfg. Co.
Consumer Products Div.
3M Center
Saint Paul, MN
28309
Kaiser
Minette,AL.
28425
Serv-0-Link
Euless, TX
28478
Deltrol CoipOCatioo
Deltrol Cootrols Div.
Milwaukee, WI
28480
Hewlett Packard Co.
Corponte HQ
Palo Alto, CA
7-5
Federal Supply Codes for Manufacturers (cont)
28484
Emerson Electric Co.
Gearmaster Div.
McHenry,IL
28520
Heyco Molded Products
Kenilworth, NJ
28932
Lumax Induslrials, Inc
Altoona, PA
31433
Kemct Electonics Corp.
Simpsonville, NC
33246
Epoxy Technology Inc.
Billerica, MA
36701
Van Waters & Rogers
Valley Field, Quebec, Canada
31448
Army Safeguard Logistics Command
Huntsville, AL
33292
Pioneer Sterilized Wiping Clolh Co.
Portland, OR
37942
Mallory Capacitor Corp.
Sub of Emhart Industties
INpolis, IN
31471
Gould Inc
Semiconductor Div
Santa ClaIB, CA
33297
NEC Electronics USA Inc.
Electtonic Arrays Inc. Div.
Mountain View, CA
39003
Maxim Industries
Middleboro, MA
31522
33919
Nortek Inc.
CIBnston, RI
4F434
Plastic Sales
Los Angeles, CA
29083
Monsanto Co.
Santa Clara, CA
Metal Masters Inc.
29604
Stackpole Components Co.
Ra!eilh, NC
31746
CaMon Electric
Woodbury, TN
29907
Omega Engineering Inc.
Stamford, CT
31827
Budwig
Ramona, CA
3D536
Aimscolnc.
Seattle, WA
31918
ITT-Schadow
Eden Prairie, MN
30035
J olo Industries Inc.
Garden Grove, CA
32293
lntersil
Cupertino, CA
30045
Solid Power Corp.
Farmingdale, NY
32539
Mura Corp.
Westbury, Long Island, N.Y.
30146
Symbex Corp.
Painesville, OH
32559
Bivar
Santa Ana, CA
30148
AB Enterprise Inc.
Ahoskie, NC
32719
Siltronics
Santa Ana, CA
Hanis Semiconductor
Products Group
Melbourne, FL
30161
Aavid Engineering Inc.
Laconia,NH
32767
Griffilh Plastics Corp.
Burlingame, CA
34576
Rockwell International Corp.
Newport Beach, CA
30315
Itron Corp.
San Diego, CA
32879
Advanced Mechanical Components
Nonluidge, CA
34641
Instrument Specialtiea
Euless, TX
30323
IL Tool Wodts Inc.
Chicago, IL
32897
Murata Erie North America Inc.
Carlisle OpeIBtions
Carlisle, Pennsylvania
34649
Intel Corp.
Santa ClaIB, CA
Baldwin, MS
40402
34114
Oak Industries
Rancho Bernardo, CA
34263
CTS Electronics Corp.
Brownsville,TX
34333
Silicon GeneIBl Inc.
Garden Grove, CA
34335
Advanced Micro Devices (AMD)
Sunnyvale, CA
34359
MN Mining & Mfg. Co.
Commmcial Office Supply Div.
Saint Paul, MN
Roderstein Electronics Inc.
Statesville, NC
42498
National Radio
Melrose, MA
43543
Nytronics Inc.(Now 53342)
43744
Panasonic Industrial Co.
San Antonio, TX
43791
Datron Systems
Wilkes Barre, PA
44655
Ohmite Mfg. Co.
Skokie, IL
34371
Harris Corp.
47001
Lumbetg Inc.
Richmond, VA
47379
ISOCOM
Campbell, CA
49569
30800
GenCIBl Instrument Corp.
Capacitor Div.
Hicksville, NY
30838
Fastec
Chicago,ILL
31019
Solid State Scientific Inc.
Willow Grove, PA
31091
Alpha Industries Inc.
Microelectronics Div.
Hatfield, PA
31323
Metro Supply Company
Sacramento, CA
7-6
32997
Bourns Inc.
Trimpot Div.
RiveISide, CA
IDT (International Development & TIBde)
Dallas, TX
49671
RCA Corp.
NewYmk,NY
34802
Electromotive Inc.
Kenilworth, NJ
49956
Raylheon Company
Executive Offices
Lexington, MA
34848
Hartwell Special Products
Placentia, CA
50590
Mostek Corp.
Replaced by: SGS Thompson Microelec
33025
MIA ComOmni Spectra, Inc. (Replacing
35009
Omni Spectra)
Renfrew Electric Co. Ltd.
Microwave Subsystems Div.
IRC Div.
Tempe, AZ
Toronto, Ontario, Canada
5F520
Panel Components Corp.
Santa Rosa, CA
33096
CO Crystal Corp.
Loveland, CO
Amilld
5P575
Nobel Electronics
Suffern, NY
33173
GeneIBl Electric Co.
Owensboro, KY
36665
MitelCorp.
Kanata, Ontario, Canada
35986
Melrose Park, IL
Ironies
SW664
NIK
Div. ofNihon Dempa Kogyo LTD
Lynchburg, VA
Federal Supply Codes for Manufacturers (cont}
5U802
Dennison Mfg. Co.
Framingham, MA
51499
Amtron Corp.
Boston, MA
52840
Westem Digital Corp.
Costa Mesa, CA
54937
DeYoungMfg.
Bellevue, WA
50088
SGS - Thomson Microelectronics Inc.
Cmollton, TX
51506
Accurate Screw Machine Co.
(ASMCO) Nutley, NJ
53021
Sangamo Weston Inc.
(See06141)
54590
RCA Corp.
Electronic Components Div.
Cherry Hill, NJ
50120
Eaglo-Picher Industries Inc.
Elecironics Div.
CO Springs, CO
51605
CODI Semiconductor Inc.
Kenilworth, NJ
53036
Textool Co.
Houston, TX
51642
Centre Engineering Inc.
State College, PA
53184
Xciton Corp.
Lathan, NY
51705
100/Rally
Palo alto, CA
53217
Technical Wire Products Inc.
Santa Barbara, CA
51791
Statelc Corp.
Orange, CA
53342
Opt Industries Inc.
Phillipsburg, NJ
50157
Midwest Components Inc.
Muskegon, MS
50356
Teac Corp. of America
Industrial Products Div
Montebello, CA
50364
MMI, Inc.(Monolithic Memories Inc)
Military Products Div.
Santa Clara, CA
50472
Metal Masters, Inc.
City of Industry, CA
50541
Hypertronics Corp.
Hudson, MA
51984
NEC America Inc.
Falls Church, VA
52063
Exar Integrated Systems
Sunnyvale, CA
52072
Circuit Assembly Corp.
Irvine, CA
50558
Eledronic Concepts, Inc.
Eatontown, NJ
52152
MN Mining & Mfg.
Saint Paul, MN
50519
Litronix Inc.
CupcZlino, CA
50891
Semiconductor Technology
Stuart, FL
50934
Tran-Tee Corp
Columbus, NE
51167
Aries Electronics Inc.
r'l'enchtown, NI
51284
Mos Technology
Noxristown, PA
51249
Heyman Mfg. Co.
Cleveland, OH
51372
V etbatim Corp.
Sunnyvale, CA
51398
MUPACCorp.
Brockton, MA
51406
Murata Erie, No. America Inc.
(Also see 72982)
Marietta, GA
52333
API Electronics
Haugpauge,Long Island.NY
52361
Communication Systems
Piscataway, NJ
52500
Amphenol, RF Operations
Burlington, MA
52525
Spaco-Lok Inc.
Len:oDiv.
Burbank, CA
52531
Hitachi Magnetics
Edmore, MO
52745
Timco
Los Angeles, CA
52763
Stettner-Electronics Inc.
Chattanooga, TN
53673
Thompson CSF Components Corp.
(Semiconductor Div)
Conaga Park, CA
53718
Airmold/W. R. Greae & Co.
Roanoke Rapids, NC
53848
Standard Microsystems
Hauppauge, NY
53894
AHAMinc.
RanchoCA, CA
53944
Glow-Lite
Pauls Valley, OK
54178
Plasmetex Industries Inc.
San Marcos, CA
54294
Shallcross Inc.
Smithfield, NC
54453
Sullins Electronic Corp.
San Marcos, CA
54473
Matsushita Electric Corp.
(Panasonic)
Secaucus, NJ
54492
Cinch Clamp Co., Inc.
Santa Rosa, CA
52771
Moniterm Corp.
Amatrom Div.
Santa Clara, CA
55112
Plessey Capacitors Inc.
(Now60935)
55261
LSI Computer Systems Inc.
Melville, NY
55285
Bercquist Co.
Minneapolis, MN
55322
Samtech Inc.
New Albany, IN
55408
STI-00 Industries Co
Buffalo, NY
55464
Central Semiconductor Corp.
Hauppauge, NY
55551
Microwave Diode Corp.
W.Stewarstown, NH
55566
R A F Electronic Hard ware Inc.
Seymour, CT
55516
Synmtrk
Santa Clara, CA
55680
Nichicon/America/Corp.
Schaumburg, IL
55943
D J Associates, Inc
(Replaced Transcon Mfg.-24618)
Fort Smilh, AZ
56282
Utelc Systems Inc.
Olalhe, KS
56289
SpRgue Electric Co.
North Adams, MA
54583
TDK
Garden City, NY
52769
Sprague-Goodman Electronics Inc.
Garden City Park, NY
55026
American Gage & Machine Co.
Simpson Electric Co. Div.
Elgin, IL
54590
RCA Corp
Distribution & Special Products
Cherry Hill, NY
54869
Piher International Corp.
Arlington Heights, IL
56365
SquareDCo.
Corpon.te Offices
Palatine, IL
56375
WESCORP
Div. Dal Industries Inc
Mountain View, CA
7-7
Federal Supply Codes for Manufacturers (cont)
56481
Shugart Associates
Sub of Xerox COip.
Sunnyvale, CA
56637
RCD Components Inc.
Manchester, NH
56708
Ziloginc.
Campbell, CA
56856
VamistorCorp. ofTN
Sevierville, TN
56880
Magnetics Inc.
Baltimore, MD
57026
Endicott Coil Co. Inc.
Binghamton, NY
57053
Gates Energy Products
Denver, CO
57170
Cambridge Thermionic
Cambridge, MA
Replaced by:
71279
lnt=onnection Products Inc.
59610
Souriaulnc
Valencia, CA
60911
InmosCOip.
CO Springs, CO
64537
KDI Electronics
Whippany, NJ
59635
HV Component Associates
Howell, NJ
60935
Westlake Capacitor Inc.
Tantalum Div.
Greencastle, IN
64782
Precision Control Mfg. Inc.
Bellevue, WA
59640
Supertex Inc.
Sunnyvale, CA
59660
Tusonix Inc.
Tucson, AZ
59730
Thomas and Betts Corp.
IA City, IA
59831
Semtronics Corp.
Watchung, NJ
6H053:
American Components Inc.
an Insilco Co. RPC Div.
Hayesville, NC
6L611
Allen, Robert G. Inc.
VanNuys,CA
6U850
Burgess Switch Co., Inc
Nonhbrook,IL
57668
R-olunCOip
Irvine, CA
6lJ095
AMD Enterprises, Inc.
Roswell, GA
57962
SGS - Thomson Microelectronics Inc
Montgomeryville, PA
6X403
SGS/ATES Semiconductor Corp.
INpolis, IN
58014
Hitachi Magnalock Corp.
(Now 12581)
6Y440
Micron Technology Inc.
Boise, ID
581()4
Simco
Atlanta, GA
60046
Power Dynamics Inc
West Orange, NJ
58364
BYCAPinc.
Chicago, IL
60197
Precicontact Inc.
Langhome, PA
58451
Precision Lamp
Cotat, CA
60386
Squires Electronics Inc
Cornelius, OR
58474
Superior Electric Co.
Bristol, CT
60395
Xicorlnc.
Milpitas, CA
58614
Communications Instruments Inc.
Fairview, NC
60399
Torin Engineered Blowers
Div. of Clevepak Corp.
Torrington, CT
59124
KOA-Spcer Electronics Inc.
Bradford, PA
60496
Micrelinc.
Sunnyvale, CA
59422
Holmberg Electronics
Irvine, CA
60705
Cera-Mite Corp.
(fonnerly Sprague)
Grafton, WI
7-8
60958
AClC
Intercomp Wire & Cable Div.
Hayesville, NC
61271
Fujitsu Microelectronics Inc
San Jose, CA
64834
WestMGCo.
San Francisco, CA
64961
Electronic Hanlware LTD
Nonh Hollywood, CA
61394
SEEQ Technology Inc.
San Jose, CA
65092
Sangarno Weston Inc.
Wes ton Instruments Div.
Newarlt,NJ
61429
Fox Electronics
Cape Coral, FL
65786
Cypress Semi
San Jose, CA
61529
Aromat Corp.
New Providence, NJ
65940
Rohm Corp & Whatney
Irvine, CA
61752
IR-ONICS Inc
Warwick, RI
65964
Evoxlnc.
Bannockburn, IL
61772
Integrated Device Technology
Santa Clara, CA
66150
Entronlnc.
Winslow Teltronics Div.
Glendale, NY
61802
Toshiba
Houston, TX
61857
SAN-0 Industrial Corp.
Bohemia, Long Island, NY
61935
Schurter Inc.
Petaluma, CA
62351
Apple Rubber
Lancaster, NY
62643
Uniled Chemicon
Rosemont, IL
62712
Seiko Instruments
Torrance, CA
62793
66302
VLSI Technology Inc.
San Jose, CA
66419
Exel
San Jose, CA
66450
Dyna-Tech Electronics, Inc
Walled Lake, MI
66608
Bering Industries
Freemont,CA
66891
BKC International Electronics
Lawrence, MA
66958
SGS Semiconductor Corp.
Phoenix, AZ
Lear Siegler Inc.
Energy Products Div.
Santa Ana, CA
63743
Wan! Leonanl Electric Co.Inc.
Mount Vernon, NY
64154
Lamb Industries
Portland, OR
64155
Linear Technology
Milpitas, CA
66967
Powerexlnc
Aubum,NY
67183
Altera
Santa Clara, CA
68919
WIMA
% Harry Levinson Co.
Seanle, WA
Federal Supply Codes for Manufacturers (cont)
7F361
Richmond-Division of Dixico
% 2'.elletbach Paper Co.
Seattle, WA
71468
n-r Cannon Div. of ITT
Fountain Valley, CA
73138
Beckman Industrial cmp.
HelipotDiv.
Fullerton, CA
75042
TRW Inc.
IRC Fixed Resistors
Philadelphia, PA
7F844
Moore Business Fonns, Inc
Seattle, WA
71482
General Instrument Corp.
Clare Div.
Chicago, IL
73168
Fenwallnc.
Ashland, MA
75297
Kester Solder Div.
Litton Systems, Inc
Des Plaines, IL
7G902
Textron Inc.
CamcarDiv.
Rockford, IL
71590
Mepco/Centralab
A North American Philips Co.
Fort Dodge, IA
73293
Hughes Aircraft Co.
Electron Dynamics Div.
Toaance, CA
75376
Kwz-Kasch Inc.
Dayton, OH
73445
Amperex Electronic Corp.
Hicksville, NY
75378
CTS Knights Inc.
Sandwich, IL
73559
Carlingswitch Inc.
Hartford, CT
75382
Kulka Electric Corp.
(Now83330)
Mount Vernon, NY
7J395
Universal Plastics
Welshpool, WA
7J696
AMD Plastics
East Lake, OH
7K354
Omni Spectra Inc
Los Altos, CA
7Z884
ALPS
Seattle, WA
7X634
Duracell USA
Div. of Dart & Kraft Inc.
Valdese, NC
70290
Almeta! Universal Joint Co.
Cleveland, OH
70485
Atlantic India Rubber Works Inc.
Chicago, IL
70563
Amperite Company
Union City, NJ
70903
Cooper-Belden Corp.
Geneva, IL
71002
Bimbach Co. Inc.
Farmingdale, NY
71034
Billey Electric Co.
Erie, PA
71183
Westinghouse Electric Corp.
Bryant Div.
Bridgeport. CT
71279
Inten:onnection Products Inc.
Formerly Midland-Ross Cambion Div.
Santa Ana, CA
71400
Bussman Manufacturing
Div. McGraw-Edison Co.
SL Louis, MO
71450
CTS Corp.
Elkhart, IN
71707
Coto Corp.
Providence, RI
71744
General Instrument Corp.
Lamp Div/Worldwide
Chicago, IL
71785
TRW Inc.
Cinch Connector Div.
Elk Grove Village, IL
71984
Dow Coming Corp.
Midland, MI
72005
AMAX Specialty Metals Corp.
Newarl<,NJ
72136
Electro Motive Mfg. Corp.
Florence, NC
72228
AMCA International Corp.
Continental Screw Div.
New Bedford, MA
72259
Nytronics Inc.
New York, NY
72619
Amperex Electronic Corp.
Dialight Div.
Brooklyn, NY
72653
G C Electronics Co.
Div. of Hydrometals Inc.
Rockford, IL
72794
Dzus Fastner Co. Inc.
West Islip, NY
72928
Gulton Industries Inc.
Gudeman Div.
Chicago, IL
72962
Elastic Stop Nut
Div. ofHarrard Industries
Union, NJ
72982
Erie Specialty Products, Inc
Formerly: Murata Erie
Erie, PA
73586
Circle F Industries
Trenton, NJ
73734
Federal Screw Products Inc.
Chicago, IL
73743
Fischer Special Mfg. Co.
Cold Spring, KY
73893
Microdot
Mt. Clemens, MS
73899
1FD Electronic Components
Div. of Murata Erie
Oceanside, NY
73905
FL Industries Inc.
San Jose, CA
73949
Guardian Electric Mfg. Co.
Chicago, IL
15569
Performance Semiconductor Corp.
Sunnyvale, CA
75915
Littelfuse Tracor
(Formerly: Tracor-Linelfuse)
Des Plaines, IL
76854
Oak Switch Systems Inc.
Crystal Lake, IL
77122
TRW Assemblies & Fasteners Group
Fastener Div.
Moutainsidc, NJ
77342
AMF Inc.
Potter & Brumfield Div.
Princeton, IN
77542
Ray-0-Vac Corp
Madison, WI
74199
Quam Nichols Co.
Chicago, IL
77638
General Instrument Corp.
Rectifier Div.
Brooklyn, NY
74217
Radio Switch Co.
Marlboro, NJ
77900
ShakeproofLock Washer Co.
(Now78189)
74306
Piezo Crystal Co.
Div. of PPA Industries Inc.
Carlisle, PA
77969
Rubbcrcraft Corp. of CA Ltd.
Torrance, CA
74445
Ho!o-Krome Co.
Elmwood, CT
78189
IL Tool Works Inc.
ShakeproofDiv.
Elgin, IL
74542
Hoyt Elect.Instr. Works Inc.
Penacook, NH
78277
Sigma Instnnnents Inc.
South Braintree, MA
74840
IL Capacitor Inc.
Lincolnwood, IL
78290
Struthers Dunn Inc.
Pitman, NI
74970
Johnson EF Co.
Waseca, MN
78553
Eaton Corp.
Engineered Fastener Div.
Cleveland, OH
7-9
Federal Supply Codes for Manufacturers (cont)
78592
Stoeger Industries
South Hackensack, NJ
81439
Thcnn-0-Disc Inc.
Mansfield, OH
83315
Hubbell Corp.
Mundelein, IL
87034
Illuminated Products Inc.
(Now76854)
79497
Western Rubber Co.
Goshen, IN
81483
International Rectifier Corp.
Los Angeles, CA
83330
Kulka Smith Inc.
A Noilh American Philips Co.
Manasquan, NJ
87516
Standard Crystal
KS City, KS
79727
C - W Industries
Southampton, PA
81590
Kony Electronics Inc.
Seattle, WA
79963
Zierick Mfg. Corp.
Mount Kisco, NY
81741
Chicago Lock Co.
Chicago, IL
&C798
Ken-Tronics, Inc.
Milan, IL
82227
Airpax Corp.
Cheshire Div.
Cheshire, CT
8D528
Baumga=s
Atlanta, GA
82240
Simmons Fastner Corp.
Albany, NY
8F330
Eaton Corp.
Cutler Hammer Product Sales Office
Mountain View, CA
82305
Palmer Electronics Corp.
South Gate, CA
8T!OO
Tellabs Inc.
Naperville, IL
82389
Switchcraft Inc.
Sub of Raytheon Co.
Chicago, IL
80009
Tektronix
Beaverton, OR
80031
Mepco/Elecua Inc.
Morristown, NJ
80032
Ford Aerospace &
Communications Corp.
Western Development
Laboratories Div.
Palo Alto, CA
80145
LFECorp.
Process Control Div.
Clinton, OH
82415
AirpaxCorp
Frederick Div.
Frederick, MD
82872
Roanwell Corp.
New Yorl<, NY
82877
Rotron Inc.
Custom Div.
Woodstock, NY
Royal Electric Div.
Pawtucket, RI
83003
Varolnc.
Garland, TX
80294
Boums Insuuments Inc.
Riverside, CA
83014
Hanwcll Corp.
Placentia, CA
80583
Hammerlund Mfg. Co. Inc.
Paramus, NJ
83055
Signalite Fuse Co.
(Now71744)
80640
Computer Products Inc.
Stevens-Arnold Div.
South Boston, MA
83058
TRW Assemblies & Fasteners Group
Fasteners Div.
Cambridge, MA
81073
Grayhill Inc.
La Grange, IL
83259
Parker-Hannifin Corp.
0-Sea!Div.
Culver City, CA
7-10
83553
Associated Spring Bames Group
Gardena,CA
83740
Union Carbide Corp.
Battery Products Div.
Danbury, CT
84171
Arco Electronics
Commack,NY
88044
Aeronautical Standards Group
Dept. of Navy & Air Force
88219
GNBinc.
Industrial Battery Div.
Langhome, PA
88245
Winchester Electronics
Litton Systems-Useco Div.
VanNuys,CA
88486
Triangle PWC Inc.
Jewitt City, CT
84411
American Shizuki
TRW Capacitors Div.
Ogallala, NE
88690
Essex Group Inc.
Wire Assembly Div.
Dearl>om,MI
84613
FIC Corp.
Rockville, MD
88786
Atlantic India Rubber Co.
Goshen, IN
84682
Essex Group Inc.
Peabody, MA
88978
Philips (Now Fluke)
Mahwah, NJ
84830
Lee Spring Co. Inc
Brooklyn, NY
89020
Amerace Corp.
Buchanan Crimptool Products Div.
Union, NJ
85367
Bearing Distributing Co.
San Fransisco, CA
89265
Potter-Brumfield
(See77342)
85372
Bearing Sales Co.
Los Angeles, CA
89462
Waldes Truarc, Inc.
Long Island, NY
85480
W. H. Brady Co.
Industrial Product
Milwaukee, WI
89536
John Fluke Mfg. Co., Inc.
Everett, WA
82879
IIT
80183
Sprague Products
(Now56289)
81312
Litton Systems Inc.
Winchester Electronics Div.
Watertown, CT
83478
Rubbercraft Corp. of America
West Haven, CT
83298
Bendix Corp.
Electric & Fluid Power Div.
Eatonville, NJ
85840
BradyWHCo
Industrial Products Div
Milwaukee, WI
89597
Fredericks Co.
Huntingdon Valley, PA
85932
Electro Film Inc.
Valencia, CA
89709
Bunker Ramo-Eltra Corp.
Amphenol Div.
Broadview, IL
86577
Precision Metal Products Co.
Peabody, MA
89730
General Electric
Lamp Div.
Newaik,NJ
86684
Radio Corp. of America
(Now54590)
9R216
Data Composition Svc, Inc
Laurel, MD
86928
Seastrom Mfg. Co. Inc.
Glendale, CA
9S171
Pon Plastics
Tukwila, WA
Federal Supply Codes for Manufacturers (cont)
9W423
Amatom
El Mont, CA
91934
Woonsocket, RI
95573
Campion Laboratories Inc.
Detroit, MI
98'Z78
Ma!co A Microdot Co.
South Pasadena, CA
90201
Mallory Capacitor Co.
Sub of Emhart Industries Inc.
Indianapolis, IN
91967
National Tel-Tronics
Div. of electro Audio Dynamics Inc
Meadville, PA
95712
Bendix Corp.
Electrical Comp. Div.
Franklin, IN
98291
Sea!ectro Corp.
BICC Electronics
Trumbill, CT
90215
Best Stamp & Mfg. Co.
KS City, MO
91984
Maida Development Co.
Hampton, VA
95987
Weckesser Co. Inc.
(Now 85480)
98372
Royal Industries Inc.
(Now 6'Z793)
90303
Duracell Inc.
Technical Sales & Mai:keting
91985
Norwalk Valve Co.
S. Norwalk, CT
96733
SFE Technologies
San Femando, CA
98388
Lear Siegler Inc.
Accurate Products Div.
San Deigo, CA
92218
Wakefield Corp., The
Wakefield, ME
96853
Gulton Industries Inc.
Measurement & Controls Div.
Manchester, NH
Miller Electric Co.
Bdhel,CT
91094
Essex Group Inc.
Suflex/IWP Div.
Newmai:ket, NH
91247
IL Transfonner Co.
Chicago, IL
91293
Johanson Mfg. Co.
Boonton, NJ
91462
Alpha Industries Inc.
Logansport, IN
91502
Associated Machine
Santa Clara, CA
91506
Augat Alcoswilch
N. Andover, MA
925'Z7
VTCinc.
Bloomington, MN
96881
Thomson Industries Inc.
Port WA, NY
92607
Tensolite Co.
Div. of Carlisle Cotp.
Buchanan, NY
97464
Industrial Retainer Ring
Irvington, NJ
92914
Alpha Wile Corp.
Elizabeth, NJ
97525
EECOinc.
Santa Ana, CA
93332
Sylvania Electric Products
Semiconductor Products Div.
97540
Woburn, MA
Master Mobile Mounts Div.
Fort Meyen, FL
97913
Industrial Electronic
Hardware Corp.
91507
Froeliger Machine Tool Co.
Stockton, CA
94222
Southco Inc.
Concordville, PA
97945
Pennwalt Corp.
SS White Industrial Products
Piscataway, NJ
91637
Dale Electronics Inc.
Columbus, NE
94988
Wagner Electric Corp.
Sub of Mcgraw-Edison Co.
Whippany, NJ
NY.NY
97966
Electronic Div.
Danvers, MA
98094
Machlett Laboratories Inc.
Santa Baibara. CA
91737
ITT Cannon/Greznar
(Now08718)
95263
Leecraft Mfg. Co.
Long Island City, NY
98159
Rubber-Teck Inc.
Gardena, CA
91802
Industrial Devices Inc.
Edgewater, NJ
95275
Vitramon Inc.
Bridgeport, CT
91833
Keystone Electronics Corp.
95303
RCA Corp.
Receiving Tube Div.
Cincinnati, OH
91836
King's Electronics Co. Inc.
Tuckahoe, NY
91929
Honeywell Inc.
Micro SWitch Div.
Freqion, IL
99217
Bell Industries Inc.
Elect. Distributor Div.
Sunnyvale, CA
99378
ATLEE of DE Inc.
N. Andover, MA
99392
Mepco/Electra Inc.
Roxboro Div.
Roxboro, NC
99515
Electron Products Inc.
Div. of American Capacitors
Duarte, CA
99779
Bunker Ramo- Eltra Corp.
BamesDiv.
Lansdown, PA
CBS
95146
Alco Electronic Products Inc.
Switch Div.
North Andover, MA
NY,NY
99120
Plastic Capacitors Inc.
Chicago, IL
Whitehall Electronics Corp.
94144
Raytheon Co.
Microwave & Power Tube Div.
Quincy, MA
91662
Elco Corp.
A Gulf Westem Mfg. Co.
Connector Div.
Huntingdon, PA
98978
IERC
(International Electronic Researoh Corp.)
Burl>ank,CA
99800
American Precision Industries
Delevan Div.
East Aurora, NY
99942
Mepco/Centralab
A North American Philips Co.
Milwaukee, WI
95348
Gordo's Corp.
Bloomfield, NJ
95354
Methode Mfg. Corp.
Rolling Meadows, IL
7-11
TECHNICAL SERVICE CENTERS
U.S. Service Locations
California
Fluke Technical Center
16969 Von Karman Avenue
Suite 100
Irvine, CA 92714
Tel: (714) 863-9031
Fluke Technical Center
46610 Landing Parkway
Fremont, CA 94538
Tel: (415) 651-5112
Colorado
Fluke Technical Center
14180 East Evans Avenue
Aurora, CO 80014
Tel: (303) 695-1171
Florida
Fluke Technical Center
940 N. Fern Creek Avenue
Orlando, FL 32803
Tel: (407) 896-4881
Illinois
Fluke Technical Center
1150 W. Euclid Ave.
Palatine, IL 60067
Tel: (312) 705-0500
Maryland
Fluke Technical Center
5640 Fishers Lane
Rockville, MD 20852
Tel: (301) 770-1576
New Jersey
Fluke Technical Center
East 66 Midland Avenue
Paramus, NJ 07652-0930
Tel: (201) 599-9500
Texas
Fluke Technical Center
1801 Royal Lane, Suite 307
Dallas, TX 75229
Tel: (214) 869-2848
Washington
Fluke Technical Center
John Fluke Mfg. Co., Inc.
1420 75th St. S.W.
MIS 6-30
Everett, WA 98203
Tel: (206) 356-5560
International
Argentina
Coasin S.A.
Virrey del Pino 4071 DPTO E-65
1430CAP FED
Buenos Aires
Tel: 54 1 522-5248
Australia
Philips Customer Support
Scientific and Industrial
23 Lakeside Drive
Tally Ho Technology Park
East Burwood
3151
Victoria
Australia
Philips Customer Support
Scientific & Industrial
25-27 Paul St. North
North Ryde N.S.W. 2113
Tel: 61 02 888 8222
Austria
Oesterreichische Philips lndustrie
Unternehmensbereich Prof. Systeme
Triesterstrasse 66
Postfach 217
A-1101 Wein
Tel: 43 222-60101, X1388
Belgium
Philips & MBLE Associated S.A.
Scientific & Industrial Equip. Div
Service Department.
80 Rue des deux Gares B-1070
Brussels
Tel: 32 2 525 6111
Brazil
Hi-Tek Electronica Lida.
Al. Amazonas 422, Alphaville
CEP 06400 Barueri
Sao Paulo
Tel: 55 11 421-5477
Canada
Fluke Electronics Canada Inc.
400 Britannia Rd. East, Unit #1
Mississauga
Ontario L4Z 1X9
Tel: 416-890-7600
Chile
lntronica Chile Lida.
Casilla 16228
Santiago 9
Tel: 56 2 2321886, 2324308
China
Fluke International Corp.
P.O. Box 9085
Beijing
Tel: 86 01 512-3436
Colombia
Sistemas E lnstrumentacion, Lida.
Carrera 13, No. 37-43, Of. 401
Ap. Aereo 29583
Bogota DE
Tel: 57 232-4532
Denmark
Philips AIS
Technical Service I & E
Strandlodsveij 1A
PO Box 1919
DK-2300
Copenhagen S
Tel: 45 1 572222
Ecuador
Proteco Coasin Cia., Lida.
P.O. Box 228-A
Ave. 12 de Octubre
2285 y Orellana
Quito
Tel: 593 2 529684
Egypt
Philips Egypt
10, Abdel Rahman el Rafei st.
el. Mohandessin
P.O. Box 242
Dokki Cairo
Tel: 20-2-490922
Hinditron Services Pvt. Ltd.
Field Service Center
Emerald Complex 1-7-264
5th Floor
114 Sarojini Devi Road
Secunderabad 500 003
Tel: 08 42-821117
England
Philips Scientific
Test & Measuring Division
Colonial Way
Watford
Hertforshire WD2 4TT
Tel: 44 923-40511
Hindtron Services Pvt. Ltd.
15 Community Centre
Panchshila Park
New Delhi 110 017
Tel: 011-6433675
Finland
Oy Philips AB
Central Service
Sinikalliontie 1-3
P.O. Box 11
SF-02630 ESPOO
Tel: 358-0-52572
France
S.A. Philips lndustrielle
et Comerciale,
Science et Industry
105 Rue de Paris Bp 62
93002 Bobigny, Cedex
Tel: 33-1-4942-8040
Germany (F.R.G.)
Philips GmbH
Service fuer FLUKE - Produkte
Department VSF
Oskar-Messter-Strasse 18
D-8045 lsmaning/Munich,
West Germany
Tel: 49 089 9605-239
Indonesia
P.T. Lamda Triguna
P.O. Box 6/JATJG
Jakarta 13001
Tel: (021) 8195365
Israel
R.D.T. Electronics Engineering, Ltd.
P.O. Box 43137
Tel Aviv 61430
Tel: 972 3 483211
Italy
Philips S.p.A.
Sezione l&E I T&M
Viale Elvezia 2
2005 Monza
Tel: 39 39 3635342
Japan
John Fluke Mfg. Co., Inc.
Japan Branch
Sumitomo Higashi Shinbashi Bldg.
1-1-11 Hamamatsucho
Minato-ku
Tokyo 105
Tel: 81 3 434-0181
Greece
Philips S.A. Hellenique
15, 25th March Street
177 78 Tavros
10210 Athens
Tel: 30 1 4894911
Korea
Myoung Corporation
Yeo Eui Do P.O. Box 14
Seoul 150
Tel: 82 2 784-9942
Hong Kong
Schmidt & Co (H.K.) Ltd.
18/FL., Great Eagle Centre
23 Harbour Road
Wanchai
Tel: 852 5 8330222
Malaysia
Macomb Malaysia Sdn. Bhd.
P.O. Box 24
46700 Petaling Jaya
Selangor
Tel: 60 3 774-3422
India
Hinditron Services Pvt. Ltd
1st Floor, 17-B,
Mahal Industrial Estate
Mahakali Road, Andheri East
Bombay 400 093
Tel: 91 22 6300043
Mexico
Mexel Servicios en Computacion
lnstrumentacion y Perifericos
Blvd. Adolfo Lopez Mateos No. 163
Col. Mixcoac
Mexico D.F.
Tel: 52-5-563-5411
Hinditron Services Pvt. Inc.
33/44A Raj Mahal Villas Extn.
8th Main Road
Bangalore 560 080
Tel: 91 812 363139
Netherlands
Philips Nederland
Test & Meetapparaten Div.
Postbus 115
5000 AC Tilburg
Tel: 31-13-352445
5189
7-12
TECHNICAL SERVICE CENTERS
New Zealand
Philips Customer Support
Scientific & Industrial Division
2 Wagener Place
Mt. Albert
Auckland
Tel: 64 9 894-160
Norway
Morgenstierne & Co. A/S
Konghellegate 3
P.O. Box 6688, Rodelokka
Oslo5
Tel: 47 2 356110
Pakistan
International Operations (PAK) Ltd.
505 Muhammadi House
I.I. Chundrigar Road
P.O. Box 5323
Karachi
Tel: 92 21 221127, 239052
Peru
lmportaciones & Representaciones
Electronicas S.A.
Avad Franklin D. Roosevelt 105
Lima 1
Tel: 51 14 288650
Singapore
Rank O'Connor's Singapore (PTE) Ltd.
98 Pasir Panjang Road
Singapore 0511
Tel: 65 4737944
South Africa
South African Philips (Pty) Ltd.
Service Department
195 Main Rd
Martindale, Johannesburg, 2092
Tel: 27 11 470-5255
Spain
Philips lberica S.A.E.
Depto. Tecnico lnstrumentacion
ctMartinez Villergas 2
28027 Madrid
Tel: 34 1 4042200
Sweden
Philips Kistaindustrier AB
Customer Support
Borgarfjordsgatan 16
S-16493 Kista
Philippines
Spark Radio & Electronics Inc.
Greenhills, P.O. Box 610
San Juan, Metro-Manila Zip 3113
Tel: 63-2-775192
Switzerland
Philips A.G.
Technischer Kundendienst
Postfach 670
Allmendstrasse 140
CH-8027 Zurich
Tel: 41 1 482211
Portugal
Decada Espectral
Equipmentos de Elec. e Cientificos
Av. Bomberios Voluntaries
Lote 102B, Miraflores/Alges
1495 Lisboa
Tel: 351 1 410-3420
Taiwan
Schmidt Electronics Corp.
5th Floor, Cathay Min Sheng
Commercial Building,
344 Min Sheng East Road
Taipei
Tel: 886 2501-3468
Thailand
Measuretronix Ltd.
2102163 Ramkamhaeng Rd.
Bangkok 10240
Tel: 66 2 374-2516, 374-1632
Turkey
Turk Philips Ticaret A.S.
Inonu Caddesi 78180
Posta Kutusu 504-Beyoglu
Istanbul
Tel: 90 1 1435891
Uruguay
Coasin Uruguaya S.A
Casilla de Correo 1400
Libertad 2525
Montevideo
Tel: 598-2-789015
Venezuela
Coasin C.A.
Calle 9 Con Calle 4, Edif. Edinurbi
Apartado de Correos Nr-70-136
Los Ruices
Caracas 1070-A
Tel: 58 2 241-0309, 241-1248
West Germany
Philips GmbH
Department VSF
Service fuer FLUKE - Produkte
Oskar - Messler - Strasse 18
D-8045 lsmaning I Munich
Tel: 49 089 9605-260
5189
7-1317-14
8920A/8921 A
Appendix 7A
Manual Change Information
NEWER INSTRUMENTS
INTRODUCTION
As changes and improvements are made to the instrument
they are identified by incrementing the revision letter
marked on the affected pcb assembly. These changes are
documented on a supplemental change/errata sheet which,
when applicable, is inserted at the front of the manual.
This appendix contains information necessary to backdate
the manual to conform with earlier pcb configurations. To
identify the configuration of the pcb's used in your instrument, refer to the revision letter (marked in ink) on the
component side of each pcb assembly. Table 7 A-1 defines
the assembly revision levels documented in this manual with
anX.
OLDER INSTRUMENTS
To backdate this manual to conform with earlier assembly
revision levels, perform the changes indicated in Table 7 A-1.
Table 7A-1. Manual Status and Backdating Information
Ref
Or
Option
No.
A1
A1
Fluke
Part
No.
Assembly
Name
Main PCB Assembly,
8920A-4001
Main PCB Assembly,
8921A-4011
*To adapt manual to earlier rev configurations perform changes
in desending order (by no.), ending with change under desired rev letter
-
B
c
456889 1 5 7
x
471904 1 5 7
x
6
x
2 3 4
x
A1A1
Display PCB Assembly,
8920A/8921 A-4002T
456921
A2
AC PCB Assembly,
8920A/8921 A-4003T
456905
A
.,.,.,..
{
D
E
F
G
H
J
K
L
M
N
p
x
•••••
-003
-004
Counter Output Option
892XA-4013T
Logarithmic Analog Option
892XA-4014T
471599
471581
{
,,,
{
x
* X = The PCB revision levels documented in this manual.
•=These revision letters were never used in the instrument.
-= No revision letter on the PCB.
7A-1
8920A/8921 A
CHANGE #1, ECO #11698
I. On Table 5-2, Al, 8920A Main PCB Assembly, delete the following items:
XFl-1, XR204.
2. On Table 5-3, Al 8921A Main PCB Assembly, delete the following items:
XFl-1, XR204.
CHANGE #2, ECO #11586
a. Replace "E402" with "OUTPUT", on Figure 603-4.
b. Delete Item C415 from Figures 603-4 and 8-5.
c. Delete Item C415 from Table 603-3.
CHANGE #3, ECO #11637
1. Delete Item L404 from Figure 6034 and 8-5.
2. Delete Item L404 from Table 603-3.
CHANGE #4 ECO #11784
On Table 603-5, -003 Counter Output Option, make the following changes:
ADD:
R401/Res, comp, 100 ±5%m l/4W/147926/0l 121/CB105/l
212704/
/212704/
MP9/Bus Wire #20/+H469/89536 115469/AR
On Figure 603-6 and 8-5, make the indicated changes:
ADD 1<401
On Figure 8-5, make indicated changes:
+15V
P401-2
ADD li!401
7A-2
+/5V
8LK
8920A/8921 A
CHANGE #5 ECO #11812
On Table 5-2, Al 8920A Main PCB Assembly, make the following changes:
DELETE: C213/Cap, cer, 10.000 pF ±20%, IOOV/149153/56289/C023BIOF103M/Ref
CHANGE TOT QTY of C204 from 4 to 3.
On Figure 4-5, 5-2, Calibration and Test Point Locations, and 8-1, Al 8920A Main PCB Assembly (Sht 2 of 3)
make the indicated changes:
5202
. 201
DQ2090
LJ2a
\--..;.---DELETE C2f3
S203
N;o
~N
0
90 0CZ05
6 0C204
On Figure 8-1, Al 8920A Main PCB Assembly (Sht 3 of 3) make the indicated changes:
J/03-9
I-I/GI-I SOUIU..€
>-----------
J/03-2 :> -14.4V
Q33 J/02-9
Q32
CRZ03 ..
IC.+DC
2.ZOrnV
S201B
-15
2 200V
J/02.-6 > - - - - - - - - - - - - - ,
C213 AND GR!OUND Rc~VEO
ECO #11792
Hardware change on 8921A-4011 Assembly, no action required in manual.
CHANGE #6 ECO #11863
On Table 5-4, Al Al 8920A/8921A Display PCB Assembly make the following changes:
453340/j~2~J/MAN3630A/
DS301/Display LED/.4%4571
QDSP3507/1
/.453332/29083/,MAN3620A/
DS302-DS305/Display LED/~/%&480/QDSPJSI 5/4
CHANGE #7 ECO #11866
Hardware change on 8920A-4001 and 8921A-401 l Assembly, no action required in manual.
7A-3/7A-4
8920A/8921 A
Section 8
Schematic Diagrams
TABLE OF CONTENTS
FIGURE
8-1
8-2
8-3
8-4
8-5
8-6
TITLE
Al 8920A Main PCB Assembly ..................................
Al 8921A Main PCB Assembly ..................................
Al Al 8920A/8921A Display PCB Assembly .......................
A2 8920A/8921A AC PCB Assembly .............................
-003 Counter Output Option .....................................
-004 Logarithmic Analog Output Option ..........................
PAGE
8-2
8-4
8-6
8-8
8-12
8-14
8-1
8920A/8921 A
J101
-Q!!D
Ou210
S201-206
J102
CR207
J103
i.---,-~c·~·~o4:!-...,1 ~~c•~•o2s--.1@][ 0"]•_-==:..---.~
h--=!"""<--'L----'· L.---+,-J
l224
U34 1
JSOl
""f
TO l2j
TQ JI
QN
T200
J20'3
MP1
8920A-1601
Figure 8-1. A1 8920A Main PCB Assembly
8-2
12!'AIW!. PAIJE\...
(B~'2.0A
Ot.Ju')
8920A/8921A
.--~~~~~~~~~~~~~~~~~
Ul-'3
- I --7 +\S\J
\'\\&H 50URC.E.
JIO~-~
Q33
JIOt-~)
Q3.2
JIOt-lo
\(..\
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.l\03.-'l)
-~~VIN
+~110
AC..+ OC.
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-5~
'l 7.qJV
7..1..0 ...'I
&ND
-1 ~ r..E.'i
-S~ f'I
TP'l.OS
Wiii
J\01-5
J!.Ol-IB
IY::.3.10
K'L1QG. JIOl-3.
Q2B,Q30 jl(Jl.-4
C.UOI
'i
.--+---+-----.'Q'lOS-l:r
>-=::..:..:..:..'---v..'V-~~~--4*"'1--+-~~~-+-~+--+.-+---~H--fQ1.03-
6
IN\
Q5
JIOl-'Z.
~'
JIO'Z.-S
Q3
JIOl-4
Q4
.l\01-fo
+5V
R1'L'l
IK
J~Ol-14
11.n1
C..11.tlllo
1001<.
wa
C.R'l.01
\J
C7.0b
~
LINE.AR
ANALOC,
EO""{jzouTPUT
._-'\/'11\,-.......
11-.7."tO
'Z.ml/
F'l.
FO
-lo~
CR10'Z.
r.1, IC:'Z.
LObi\KlTHlv\1[ ANi\LO& OUWUT
J5DI
(0920A
L'Z.01
ONLY)
~UH
'lAD\J
0
I
TP'l.Olo
TP'Z.0'2>
Fl
R'Z.~S _Q~JI
1001(, \!/ ~ 4
C'l.01
: I0°/o 1 t;1D9 :,210
I
0
1001/
I
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110\J
0
uov 0
I/BA
:;..-w1,-9
410P~ '!.OOOPFt
J101-1
Q31
-ISV
J 103-~>---ISV
-------~'5>\J
JIO'Z.-3 >-- -ISV
JIO~~
>--+ISV
R~
JI06-4 >--<,\5V
TP'Z.01
I
R'L00
10~
C1D4
-ISIJ
17-tzD
WI'.
R'Z.10
150
-01
-15~
R'Z.'Z.I
'Z.Ot(.
..----<1-----''l..=--<J ~o 1-1
'R'l.'L3
'l.01<-
dB
REL
I
5?.0SC.
~SWl.A
-\SV
I)
+S.V
w
tllO!i·{,,) LO SOURCE
i7
tll0~-5
>-- ...sv
+51/
TP'l.01
..llO'l.·'Z.>-w
.J~OI
-l~"'t..
I
-ISi/
IS
I
-'Z.
INT FO fl
•.uoi-0 ~ -~-1sv
Ul-S
Lll&ITAL O\.l"\l"\JT
I
R'l.11
22."'
'!>1 INT
R't~
IOI'...
't
CV.
38
Aft
CtOI
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4.1
892X-1013
Figure 8-5. -003 Counter Output Option (cont)
8920A/8921 A
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CR501 P501
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8920A-1614
Figure 8-6 . -004 Logarithmic Analog 0 utput Option
8-14
8920A/8921 A
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l\IO"TE.'.:>·. Ul'llE'S:.S 0\1-\'0ZWl'.k "')PEC1r1t.l):
I. ALL RE.SISIAl'KE. \l/\lUE.'S IN Ot-11\.\':>.
l. ALL C.AP~CITANC.E. \/AlUE.S IN lv'\IC.RDFAR~\tl':>
8920A-1014
Figure 8-6. ·004 Logarithmic Analog Output Option (cont)
8-1 S/8-16
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