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®
8508A
Reference Multimeter
September 2004 Rev. 1, 8/08
© 2004, 2008 Fluke Corporation, All rights reserved. Specifications are subject to change without notice
All product names are trademarks of their respective companies.
Service Manual
Manual Supplement
Manual Title: 8508A Service
Print Date: July 2002
Revision/Date: 1, 8/08
Supplement Issue:
1
Issue Date:
Page Count:
3/09
1
This supplement contains information necessary to ensure the accuracy of the above manual. This manual is distributed as an electronic manual on the following CD-ROM:
CD Title:
CD Rev. & Date:
CD PN:
8508A
2, 8/2008
2150143
© 2009 Fluke Corporation. All rights reserved. Printed in U.K.
x
8508A Service
Change #1
On page 4-12, replace Table 4-1 with the following:
Table 4-1. Power Input Fuse 1
8508A Line
Setting
Rating Size Type
230 V Line 630 mA 250 V 20 mm (TH)
115 V line 1.25 A 250 V 20 mm (TH)
100 V Line 1.6 A 250 V 20 mm (F)
Manufacturer Part
Number
Schurter 001.2502
Schurter 001.2505
Schurter 0001.1006
Manual Supplement
Fluke Part
Number
1582145
1582150
1582072
3/09 1
Warranty
Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is one year and begins on the date of shipment. Parts, product repairs, and services are warranted for 90 days. This warranty extends only to the original buyer or end-user customer of a Fluke authorized reseller, and does not apply to fuses, disposable batteries, or to any product which, in
Fluke's opinion, has been misused, altered, neglected, contaminated, or damaged by accident or abnormal conditions of operation or handling. Fluke warrants that software will operate substantially in accordance with its functional specifications for 90 days and that it has been properly recorded on non-defective media.
Fluke does not warrant that software will be error free or operate without interruption.
Fluke authorized resellers shall extend this warranty on new and unused products to end-user customers only but have no authority to extend a greater or different warranty on behalf of Fluke. Warranty support is available only if product is purchased through a Fluke authorized sales outlet or Buyer has paid the applicable international price. Fluke reserves the right to invoice Buyer for importation costs of repair/replacement parts when product purchased in one country is submitted for repair in another country.
Fluke's warranty obligation is limited, at Fluke's option, to refund of the purchase price, free of charge repair, or replacement of a defective product which is returned to a Fluke authorized service center within the warranty period.
To obtain warranty service, contact your nearest Fluke authorized service center to obtain return authorization information, then send the product to that service center, with a description of the difficulty, postage and insurance prepaid (FOB Destination). Fluke assumes no risk for damage in transit. Following warranty repair, the product will be returned to Buyer, transportation prepaid (FOB Destination). If Fluke determines that failure was caused by neglect, misuse, contamination, alteration, accident, or abnormal condition of operation or handling, including overvoltage failures caused by use outside the product’s specified rating, or normal wear and tear of mechanical components, Fluke will provide an estimate of repair costs and obtain authorization before commencing the work. Following repair, the product will be returned to the Buyer transportation prepaid and the Buyer will be billed for the repair and return transportation charges
(FOB Shipping Point).
THIS WARRANTY IS BUYER'S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. FLUKE SHALL NOT BE LIABLE
FOR ANY SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OR LOSSES,
INCLUDING LOSS OF DATA, ARISING FROM ANY CAUSE OR THEORY.
Since some countries or states do not allow limitation of the term of an implied warranty, or exclusion or limitation of incidental or consequential damages, the limitations and exclusions of this warranty may not apply to every buyer. If any provision of this Warranty is held invalid or unenforceable by a court or other decision-maker of competent jurisdiction, such holding will not affect the validity or enforceability of any other provision.
Fluke Corporation
P.O. Box 9090
Everett, WA 98206-9090
U.S.A.
11/99
To register your product online, visit register.fluke.com
Fluke Europe B.V.
P.O. Box 1186
5602 BD Eindhoven
The Netherlands
Table of Contents
Chapter Title
1
2
Page
Introduction and Specifications......................................................... 1-1
Maximum Voltage and Current Inputs.......................................................... 1-8
Resistance and Temperature ..................................................................... 1-8
Read Rate and Additional Uncertainty.......................................................... 1-18
Applying User’s Calibration Uncertainties ................................................... 1-20
Operating and Calibration Temperature Ranges ........................................... 1-20
Applying Temperature Coefficient Specifications ........................................ 1-20
Theory of Operation ............................................................................ 2-1
i
8508A
Service Manual
3
Calibration and Verification................................................................ 3-1
Accessing the Calibration Menus and Calibration Mode .............................. 3-4
SPOT FREQUENCY (1 to 6) Menu ............................................................. 3-6
Exit From Calibration Mode and Non-Volatile Input Offset Adjustment..... 3-29
Cal Due Date Entry and Calibration Mode Disable ...................................... 3-30
Applicable Verification Tolerance and Conditions ....................................... 3-32
Removing the A3 Ohms PCA ....................................................................... 4-7
ii
5
Contents
(continued)
Removing the A5 Bezel Assembly................................................................ 4-9
Removing the A5A1 Display PCA................................................................ 4-10
Removing the A6 Rear Input Assembly........................................................ 4-11
Fuse Replacement and Line-Voltage Selection ................................................. 4-12
Line-Power Fuse F1 and Voltage Selection .................................................. 4-12
Rear-Input Current Fuse F2 (Rear Inputs Option)......................................... 4-13
List of Replaceable Parts.................................................................... 5-1
iii
8508A
Service Manual iv
List of Tables
Table Title Page
3-1. Required Equipment for Calibration and Performance Verification...................... 3-10
3-2. Calibration
Voltage
3-4. AC
Points and Sequence........................................................ 3-15
Points and Sequence........................................................ 3-17
Voltage
3-9. AC
Points and Sequence ...................................................... 3-34
Points and Sequence ...................................................... 3-36
v
8508A
Service Manual vi
List of Figures
Page
vii
8508A
Service Manual viii
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Chapter 1
Introduction and Specifications
Maximum Voltage and Current Inputs............................................................ 1-8
Applying User’s Calibration Uncertainties ..................................................... 1-20
Operating and Calibration Temperature Ranges ............................................. 1-20
Applying Temperature Coefficient Specifications .......................................... 1-20
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8508A
Service Manual
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Introduction and Specifications
Introduction
1
Introduction
The Fluke 8508A Reference Multimeter (hereafter "the Multimeter") is designed for the most demanding measurement applications and provides extremely high measurement precision in both stand-alone and systems applications.
This Service Manual provides the information necessary to maintain the Multimeter at a module (or board) level. A brief description of the information contained in the various chapters follows:
Chapter 1
Introduction and Specification
provides a brief description of the product, safety information regarding the product and its use, and a complete set of detailed specifications.
Chapter 2
Theory of Operation
provides an overall functional description of the internal workings of the Multimeter. The intent of the theory is to aid in locating and isolating a faulty PCA.
Chapter 3
Calibration and Verification
provides a thorough and complete description of both the Verification and the Calibration procedures for the Multimeter.
Chapter 4
Maintenance
provides detailed descriptions of how to disassemble the
Multimeter to the PCA level. The purpose of the descriptions is to assist with equipment repairs at the PCA level.
Chapter 5
List of Replaceable Parts
provides all of the information required to identify and order replacement parts for repairing the Multimenter at the PCA level.
XW
Warning
To avoid electric shock, personal injury, or death, carefully read the information under Safety Considerations before attempting to install, use, or service the Multimeter.
Safety Considerations
This instrument has been designed and tested in accordance with the European standard publication EN61010-1: 2001 and U.S. / Canadian standard publications UL 61010-1A1 and CAN/CSA-C22.2 No.61010.1. The instrument has been supplied in a safe condition.
This manual contains information and warnings that must be observed to keep the instrument in a safe condition and ensure safe operation.
Using or servicing this Multimeter in conditions other than as specified in the Service
Manual could compromise your safety.
To use the Multimeter correctly and safely, read and adhere to the precautions on the
Safety Page
and follow all the safety instructions or warnings given throughout this manual and the Users Manual that relate to specific measurement functions. In addition, follow all generally accepted safety practices and procedures required when working with and around electricity. http://www.elso.sk
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Service Manual
XW
Safety – Read First
Warning: To avoid possible electric shock, personal injury, or death, read the following before using the Multimeter:
⇒
Use the Multimeter only as specified in this manual, or the protection provided by the Multimeter might be impaired.
⇒
Do not use the Multimeter in wet environments.
⇒
The Multimer can output lethal voltages. Use it only as described in this manual.
⇒
Inspect the Multimeter before using it. Do not use the Multimeter if it appears damaged. Pay particular attention to the insulation around the connectors.
⇒
Inspect the test leads before use. Do not use them if insulation is damaged or metal is exposed. Check the test leads for continuity. Replace damaged test leads before using the Multimeter.
⇒
Verify the Multimeter's operation by measuring a known voltage before and after using it. Do not use the Multimeter if it operates abnormally. Protection may be impaired. If in doubt, have the Multimeter serviced.
⇒
Whenever it is likely that safety protection has been impaired, make the Multimeter inoperative and secure it against any unintended operation.
⇒
Have the Multimeter serviced only by qualified service personnel.
⇒
Do not apply more than the rated voltage, as marked on the Multimeter, between the terminals or between any terminal and earth ground.
⇒
Always use the power cord and connector appropriate for the voltage and outlet of the country or location in which you are working.
⇒
Remove test leads from the Multimeter before opening the case.
⇒
Never remove the cover or open the case of an instrument without first removing the power source.
⇒
Never operate the Multimeter with the cover removed or the case open.
⇒
Use caution when working with voltages above 30 V ac rms, 42 V ac peak, or 42 V dc. These voltages pose a shock hazard.
⇒
Use only the replacement fuse(s) specified by the manual.
⇒
Use the proper terminals, function, and range for your measurements.
⇒
Do not operate the Multimeter around explosive gas, vapor, or dust.
⇒
When using probes, keep your fingers behind the finger guards.
⇒
When making electrical connections, connect the common test lead before connecting the live test lead; when disconnecting, disconnect the live test lead before disconnecting the common test lead.
⇒
Disconnect circuit power and discharge all high-voltage capacitors before testing resistance, continuity, diodes, or capacitance.
⇒
Before measuring current, check the Multimeter's fuses and turn OFF power to the circuit before connecting the Multimeter to the circuit.
⇒
When servicing the Multimeter, use only specified replacement parts.
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Introduction and Specifications
Safety Considerations
1
Symbols
The following safety and electrical symbols may be used on the Multimeter or in this manual.
+
Power ON / OFF
W Risk of danger.
Important information. See manual.
X
Hazardous voltage. Voltage > 30 V dc or ac peak might be present
J
Earth ground.
B
AC (Alternating Current).
F
DC (Direct Current).
D or
C
AC or DC (Alternating or Direct Current)
CAT
IEC 61010 Overvoltage (installation or measurement) Category .
I
Fuse.
~
Do not dispose of this product as unsorted municipal waste. Go to Fluke’s website for recycling information.
H
Digital signal.
Y
Potentially hazardous voltage.
<
Recycle.
T
Double insulated. http://www.elso.sk
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8508A
Service Manual
Service Information
In case of difficulty within the 1-year Warranty period, return the Multimeter to a Fluke
Service Center for Warranty repair. For out of Warranty repair, contact a Fluke Service
Center for a cost estimate.
This service manual provides instructions for verification of performance, calibration, and maintenance. If you choose to repair a malfunction, information in this manual can help you to determine which module (PCA) has a fault. See Chapter 5 for cautions about handling the internal components.
How to Contact fluke
To contact Fluke, call one of the following telephone numbers:
USA: 1-888-99-FLUKE (1-888-993-5853)
Canada: 1-800-36-FLUKE (1-800-363-5853)
Europe: +31 402-675-200
Japan: +81-3-3434-0181
Singapore: +65-738-5655
Anywhere in the world: +1-425-446-5500
Or, visit Fluke's Web site at www.fluke.com
.
To register your product, visit register.fluke.com
Specifications
Figure 1-1 shows the overall dimensions of the 8505A Reference Multimeter.
427 mm
(16.8 in)
8.8 mm
(3.5 in)
487 mm
(19.2 in) avw001f.eps
Figure 1-1. 8508A Dimentional Outline Drawing
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Introduction and Specifications
Specifications
1
General Specifications
Power
Voltage
115 V Setting ..................................................... 100 V to 120 V rms
±
10 %
230 V Setting ..................................................... 200 V to 240 V rms
±
10 %
Frequency ............................................................... 47 Hz to 63 Hz
Consumption........................................................... < 80 VA
Dimensions
Height...................................................................... 88 mm (3.5 inches)
Width....................................................................... 427 mm (16.8 inches)
Depth ...................................................................... 487 mm (19.2 inches)
Weight..................................................................... 11.5 kg (25.5 lbs)
Environment
Temperature
Operating ............................................................ 0 °C to 50 °C
Specified Operation ............................................ 5 °C to 40 °C
Calibration (TCal)................................................ 20 °C to 25 °C
Factory Cal Temp ............................................... 23 °C
Storage ............................................................... -20 °C to 70 °C
Warm Up............................................................. 4 hours to full uncertainty specification.
Relative Humidity (non- condensing)
Operating ........................................................... 5 °C to 40 °C < 90 %
Storage .............................................................. 0 °C to 70 °C < 95 %
Altitude
Operating ............................................................ < 2000 meters
Storage ............................................................... < 12000 meters
Vibration and Shock................................................ Complies with MIL-PRF-28800F Class 3.
Safety
..................................................................... Designed and tested to EN61010-1: 2001, UL 61010-1A1,
CAN/CSA-C22.2 No.61010.1, CE and ETL marked.
Pollution Degree 2.
Installation Category II.
Equipment Class I (single insulation / Earthed metal case).
Protection against water ingress IP4X (general indoor conditions).
Input circuitry and connections (creepage and clearances) designed to interface at Installation or Measurement Category I.
EMC
........................................................................ EN50081-1 Class B, EN55011/22, EN61326-1:1998,
EN50082-1, EN55011 1991 Class B,
EN61000-6-1:2001, FCC Rules part 15 sub part J class B,
CETL and CE marked.
Measurement Isolation
Guard to Safety Ground ......................................... < 3300 pF, > 10 G
Ω
.
Lo to Guard
In Remote Guard ................................................ < 2800 pF, > 10 G
Ω
(Not in Resistance function).
In Local Guard .................................................... Lo and Guard terminals are internally shorted
(in Resistance < 2800 pF, > 10 G
Ω
).
Autorange
Range Up................................................................ 100 % of range.
Range Down ........................................................... 9 % of range (18 % on 1000 V range).
Remote Interface
................................................... IEEE 488.2
Warranty
................................................................ 1 Year http://www.elso.sk
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Service Manual
Maximum Voltage and Current Inputs
Notes to maximum voltage and current input specifications
•
•
•
•
Maximum DC input equal to maximum rms input. Maximum peak input is rms x 1.414
Specifications apply equally to front and rear input terminals except where noted below.
Front to rear isolation allows opposing polarity of maximum terminal voltage on each input.
Digital I/O Ground (DigGnd) is internally connected to Safety Ground (Ground).
DC and AC Voltage
Maximum rms terminal voltages
Ground
Notes
•
•
DigGnd
0 V
Guard
650 V
650 V
A
1000 V
650 V
650 V
Lo
1000 V
250 V
650 V
650 V
250 V
1000 V
250 V
650 V
650 V
The A terminal is open circuit in these functions.
In 4wV mode Sense Hi is internally connected to Hi and Sense Lo is internally connected to Lo.
DC and AC Current
1000 V
1000 V
1000 V
1000 V
1000 V
Maximum rms terminal voltages
1000 V
1000 V
1000 V
1000 V
1000 V
Ground
DigGnd
0 V
Guard
650 V
650 V
A
250 V
650 V
650 V
Lo
5 V
250 V
650 V
650 V
250 V
250 V
250 V
650 V
650 V
1000 V
1000 V
1000 V
1000 V
1000 V
1000 V
1000 V
1000 V
1000 V
1000 V
Front Input
Rear input
Guard n.a n.a
Maximum rms terminal currents
A
20 A
2 A
Lo
20 A
2 A
Sense Lo n.a n.a
Hi n.a n.a
Sense Hi n.a n.a
Notes
•
•
•
The Sense Lo, Sense Hi, and Hi Terminals are open circuit in these functions.
The front input A terminal protection is automatic and self-resetting, and does not interrupt current flow. Damage is likely to occur if more than 20 A is applied.
The rear input A terminal is protected by a fuse mounted on the rear panel.
Resistance and Temperature
Maximum rms terminal voltages
1-8
Ground
Note
•
DigGnd
0 V
Guard
650 V
650 V
A
250 V
650 V
650 V
The A terminal is open circuit in these functions.
Lo
250 V
250 V
650 V
650 V http://www.elso.sk
250 V
250 V
250 V
650 V
650 V
250 V
250 V
250 V
1000 V
1000 V
250 V
250 V
250 V
1000 V
1000 V
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Introduction and Specifications
Specifications
1
DC Voltage
DC Voltage
[1] [2] [3]
Uncertainty Relative to Cal Stds Absolute Uncertainties
± (ppm Reading + ppm Range)
[4]
Range Full
24 hour
TCal ±1 °C
90 day
TCal ±1 °C
365 day
TCal ±1 °C
365 day
TCal ±1 °C
365 day TCal
±5 °C
95 % Confidence Level
200 mV
2 V
20 V
200 V
199.990 000
1.999 900 00
19.999 000 0
199.990 000
1000 V 1050.000 00
99 % Confidence Level
200 mV
2 V
20 V
200 V
1000 V
199.990 000
1.999 900 00
19.999 000 0
199.990 000
1050.000 00
Range
0.7 + 0.5
0.5 + 0.2
0.5 + 0.2
1.0 + 0.2
1.0 + 0.5
1.4 + 0.5
1.4 + 0.2
1.4 + 0.2
2.6 + 0.2
2.6 + 0.5
2.7 + 0.5
2.7 + 0.2
2.7 + 0.2
4.0 + 0.2
4.0 + 0.5
4.5 + 0.5
3.0 + 0.2
3.0 + 0.2
4.5 + 0.2
4.5 + 0.5
5.0 + 0.5
3.5 + 0.2
3.5 + 0.2
5.5 + 0.2
5.5 + 0.5
0.8 + 0.6
0.6 + 0.25
0.6 + 0.25
1.2 + 0.25
2.0 + 0.6
1.8 + 0.25
1.8 + 0.25
3.5 + 0.25
3.5 + 0.6
3.5 + 0.25
3.5 + 0.25
5.2 + 0.25
1.2 + 0.6 3.5 + 0.6 5.2 + 0.6
DC Voltage (Secondary Specifications)
[1] [2] [3]
Temperature Coefficient
Transfer Uncertainty
20 mins ±1 °C ± (ppm
Reading+ ppm Range)
15 °C - 30 °C
6.0 + 0.6
4.0 + 0.25
4.0 + 0.25
6.0 + 0.25
6.0 + 0.6
± ppm Reading/°C
6.5 + 0.6
4.5 + 0.25
4.5 + 0.25
7.0 + 0.25
7.0 + 0.6
5 °C - 15 °C
30 °C - 40 °C
200 mV
2 V
20 V
200 V
1000 V
0.4 + 0.3
0.12 + 0.1
0.12 + 0.1
0.4 + 0.1
0.4 + 0.3
0.4
0.3
0.3
0.7
0.7
0.6
0.5
0.5
1.0
1.0
Type
....................................................................... Multi-slope, multi-cycle A-D Converter
CMRR
(1 k
Ω
unbalance)
[5]
.................................... 140 dB at DC and 1 - 60 Hz
NMRR
[5]
Filter Out ................................................................. 60 dB at 50/60 Hz ±0.09 %
Filter In .................................................................... 110 dB at 50/60 Hz ±0.09 %
Protection
(All ranges)........................................... 1 kV rms
Input Impedance
200 mV to 20 V Ranges.......................................... > 10 G
Ω
200 V & 1000 V Ranges ......................................... 10.1 M
Ω
± 1 %
Max Input Current
................................................. 50 pA
Ratio Accuracy
Range to Range...................................................... ±(Net Front Input Accuracy + Net Rear Input Accuracy)
Within Range .......................................................... Apply 24 hour or 20 minute Transfer Uncertainty specifications
Settling Time
(to 10 ppm step size)
Filter Out ................................................................. < 50 ms
Filter In .................................................................... < 1 s http://www.elso.sk
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DC Current
DC Current
[1] [2] [3]
Range Full Scale
[15]
24 hour
TCal ±1 °C
± (ppm Reading + ppm Range)
[4]
90 day
TCal ±1 °C
365 day
TCal ±1 °C
365 day
TCal ±1 °C
365 day
TCal ±5 °C
95 % Confidence Level
200 μA
2 mA
20 mA
200 mA
199.990 00
1.999 900 0
19.999 000
199.990 00
2 A 1.999 900 0
20 A 19.999 000
99 % Confidence Level
200 μA
2 mA
20 mA
200 mA
2 A
20 A
199.990 00
1.999 900 0
19.999 000
199.990 00
1.999 900 0
19.999 000
Range
200
μ
A
2 mA
20 mA
200 mA
2 A
20 A
5.5 + 2.0
5.5 + 2.0
6.5 + 2.0
28 + 4.0
80 + 8.0
200 + 20
6.0 + 2.0
6.0 + 2.0
7.0 + 2.0
30 + 4.0
125 + 8.0
290 + 20
6.5 + 2.0
6.5 + 2.0
8.0 + 2.0
33 + 4.0
170 + 8.0
380 + 20
12 + 2.0
12 + 2.0
13 + 2.0
36 + 4.0
170 + 8.0
380 + 20
12 + 2.0
12 + 2.0
14 + 2.0
48 + 4.0
185 + 8.0
400 + 20
7.0 + 2.0
7.0 + 2.0
8.0 + 2.0
35 + 4.0
100 + 8.0
250 + 20
7.5 + 2.0
7.5 + 2.0
9.0 + 2.0
37 + 4.0
150 + 8.0
350 + 20
8.0 + 2.0
8.0 + 2.0
10 + 2.0
40 + 4.0
205 + 8.0
450 + 20
15 + 2.0
15 + 2.0
16 + 2.0
45 + 4.0
210 + 8.0
455 + 20
16 + 2.0
16 + 2.0
18 + 2.0
60 + 4.0
225 + 8.0
500 + 20
DC Current (Secondary Specifications)
[1] [2] [3]
Temperature Coefficient
Input Impedance (
Ω
)
15 °C - 30 °C
5 °C - 15 °C
30 °C - 40 °C
Front Rear
150
15.2
1.8
1.2
0.3
0.04
150
15.2
1.9
1.3
0.4
-
0.4
0.4
1.2
6. 0
8.0
15
± ppm Reading/°C
0.6
0.6
1.8
9.0
12
20
Type
........................................................................ Multi-slope, multi-cycle A-D Converter
Protection
Front Input............................................................... 20 A rms
Rear Input ............................................................... 2 A rms, Rear Panel Fuse
Settling Time
200
μ
A to 200 mA Ranges, to 10 ppm step size .... Filter Out < 50 ms, Filter In < 1 s
2 A Range to 100 ppm step size........................................... < 1 s to 75 ppm step size............................................. < 30 s to 30 ppm step size............................................. < 5 minutes
20 A Range (at 10 A) to 300 ppm step size........................................... < 1 s to 250 ppm step size........................................... < 30 s to 100 ppm step size........................................... < 5 minutes
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Introduction and Specifications
Specifications
1
AC Voltage
Scale
[15]
AC Voltage
[1] [2] [6] [7]
Uncertainty Relative to Cal Stds Absolute Uncertainties
[9]
± (ppm Reading + ppm Range)
[4]
24 hour
TCal ±1 °C
90 day
TCal ±1 °C
365 day
TCal ±1 °C
365 day
TCal ±1 °C
365 day
TCal ±5 °C
95% Confidence Level
200 mV 199.990 0
2 V, 20 V &
200 V
1.999 900
19.999 00
199.990 0
1000 V
[8]
1050.000
99% Confidence Level
200 mV 199.990 0
2 V, 20 V &
200 V
1000 V
[8]
1.999 900
19.999 00
199.990 0
1050.000
1 - 10
10 - 40
40 - 100
100 - 2 k
2k - 10 k
10k - 30 k
30k - 100 k
1 - 10
10 - 40
40 - 100
100 - 2 k
80 + 70
80 + 20
60 + 20
40 + 10
60 + 20
250 + 30
400 + 100
70 + 60
70 + 10
50 + 10
30 + 10
120 + 70
120 + 20
100 + 20
100 + 10
100 + 20
300 + 40
700 + 100
100 + 60
100 + 10
80 + 10
60 + 10
120 + 70
120 + 20
100 + 20
100 + 10
100 + 20
300 + 40
700 + 100
100 + 60
100 + 10
80 + 10
60 + 10
160 + 70
130 + 20
110 + 20
105 + 10
105 + 20
305 + 40
705 + 100
140 + 60
105 + 10
85 + 10
65 + 10
165 + 70
140 + 20
115 + 20
110 + 10
135 + 20
340 + 40
765 + 100
150 + 60
115 + 10
90 + 10
75 + 10
2 k - 10 k
10 k - 30 k
50 + 10
100 + 20
80 + 10
200 + 20
80 + 10
200 + 20
85 + 10
205 + 20
110 + 10
220 + 20
30 k - 100 k 250 + 100 500 +100 500 +100 505 + 100 570 + 100
100 k - 300 k 0.15 % + 0.1 % 0.3 % + 0.1 % 0.3 % + 0.1 % 0.3 % + 0.1 % 0.3 % + 0.1 %
300 k - 1 M
1 - 10
10 - 40
40 - 10 k
10 k - 30 k
30 k - 100 k
1 % + 0.5 %
70 + 70
70 + 20
50 + 20
100 + 40
250 + 200
1 % + 1 %
100 + 70
100 + 20
80 + 20
200 + 40
500 + 200
1 % + 1 %
100 + 70
100 + 20
80 + 20
200 + 40
500 + 200
1 % + 1 %
140 + 70
110 + 20
95 + 20
205 + 40
510 + 200
1 % + 1 %
150 + 70
120 + 20
115 + 20
225 + 40
580 + 200
1 - 10
10 - 40
40 - 100
100 - 2 k
2 k - 10 k
10 k - 30 k
30 k - 100 k
90 + 80
90 + 25
70 + 25
45 + 12
70 + 25
270 + 35
450 + 120
140 + 80
140 + 25
115 + 25
115 + 12
115 + 25
340 + 50
750 + 120
140 + 80
140 + 25
115 + 25
115 + 12
115 + 25
340 + 50
750 + 120
200 + 80
145 + 25
125 + 25
125 + 12
125 + 25
345 + 50
755 + 120
210 + 80
160 + 25
135 + 25
135 + 12
165 + 25
395 + 50
855 + 120
1 - 10
10 - 40
40 - 100
100 - 2 k
2 k - 10 k
80 + 70
80 + 12
60 + 12
35 + 12
60 + 12
115 + 70
115 + 12
90 + 12
70 + 12
90 + 12
115 + 70
115 + 12
90 + 12
70 + 12
90 + 12
180 + 70
120 + 12
95 + 12
75 + 12
95 + 12
190 + 70
135 + 12
110 + 12
90 + 12
135 + 12
10 k - 30 k
30 k - 100 k
115 + 25
270 + 120
240 + 25
550 + 120
240 + 25
550 +120
245 + 25
555 + 120
260 + 25
650 + 120
100 k - 300 k 0.15 %+0.12 % 0.3 %+0.12 % 0.3 % + 0.12 % 0.3 % + 0.12 % 0.3 % + 0.12 %
300 k - 1 M 1 % + 0.6 % 1 % + 1.2 % 1 % + 1.2 % 1 % + 1.2 % 1 % + 1.2 %
1 - 10
10 - 40
40 - 10 k
10 k - 30 k
30 k - 100 k
80 + 80
80 + 25
60 + 25
115 + 50
270 + 250
115 + 80
115 + 25
90 + 25
240 + 50
600 + 250
115 + 80
115 + 25
90 + 25
240 + 50
600 + 250
180 + 80
135 + 25
110 + 25
250 + 50
615 + 250
190 + 80
145 + 25
140 + 25
265 + 50
700 + 250 http://www.elso.sk
1-11
riešenia na presné meranie
8508A
Service Manual
200 mV
2 V
20 V
200 V
1000 V
AC Voltage (Secondary Specifications)
[1] [2]
Range Frequency
1 - 10
10 - 40
40 - 100
100 - 2 k
2 k - 10 k
10 k - 30 k
30 k - 100 k
1 - 10
10 - 40
40 - 100
100 - 2 k
2 k - 10 k
10 k - 30 k
30 k - 100 k
100 k - 300 k
300 k - 1 M
1 - 10
10 - 40
40 - 10 k
10 k - 30 k
30 k - 100 k
12
40
60
80
5
5
5
5
10
5
5
5
12
15
40
5
5
5
10
12
40
Temperature Coefficient
5 °C - 15 °C
30 °C - 40 °C
± ppm Reading/°C
10
10
10
10
15
20
60
90
120
10
10
10
10
10
10
20
20
60
15
20
60
Type
....................................................................... True rms, AC coupled measures AC component with up to 1000 V DC bias on any range. DC coupled gives
(ac
2 + dc
2
)
CMRR
(1 k
Ω
unbalance)
[5]
..................................... > 90 dB DC - 60 Hz
Crest Factor
200 mV to 200 V ranges ........................................ 10:1 at 12 % range, 5:1 at 50 % range, 2.5:1 at full range
1000 V range ......................................................... 10:1 at 25 % range, 5:1 at full range
Protection
(All ranges)........................................... 1 kV rms
Input Impedance
................................................... 1 M
Ω
in parallel with 150 pF
DC Accuracy
(DC Coupled)................................... Add ±(50 ppm Reading + 50 ppm Range + 20
μ
V)
Ratio Accuracy
Range to Range...................................................... ±(Net Front Input Accuracy + Net Rear Input Accuracy)
Within Range ......................................................... Apply 24 hour or 20 minute Transfer Uncertainty specifications
Settling Time
(to 100 ppm step size)
100 Hz filter............................................................. < 0.5 s
40 Hz filter............................................................... < 1.25 s
10 Hz filter............................................................... < 5 s
1 Hz filter................................................................. < 50 s
Frequency Measurement
Signal Amplitude Range ......................................... 5 % of range to limit set by maximum V
.
Hz
Gate Mode Normal
Resolution......................................................... 6.5 digits
Fast
4.5 digits
Frequency Range ............................................. 10 Hz - 1 MHz
Accuracy (1 year, 13 °C - 33 °C) ..................... ± (10 ppm of Reading + 2 digits)
Sample Interval................................................. 1 s
200 Hz - 1 MHz
± 2 digits
50 ms
1-12 http://www.elso.sk
riešenia na presné meranie
Introduction and Specifications
Specifications
1
AC Current
Scale
[15]
Frequency
(Hz)
AC Current
[1] [2] [6] [9]
Uncertainty Relative to Cal Stds Absolute Uncertainties
[9]
± (ppm Reading + ppm Range)
[4]
24 hour
TCal ±1 °C
90 day
TCal ±1 °C
365 day
TCal ±1 °C
365 day
TCal ±1 °C
365 day
TCal ±5 °C
200 mA
2 A
20 A
95% Confidence Level
200
μ
A
199.990 0
2 mA &
20 mA
1.999 900
19.9990 00
200 mA 199.990 0
2 A 1.999 900
20 A 19.999 00
99% Confidence Level
200
μ
A
199.990 0
2 mA &
20 mA
1.999 900
19.999 00
199.990 0
1.999 900
19.999 00
1 - 10
10 - 10 k
200 + 100
200 + 100
250 + 100
250 + 100
10 k - 30 k 500 + 100 600 + 100
30 k - 100 k 0.35 % + 100 0.4 % + 100
1 - 10
10 - 10 k
10 k - 30 k
200 + 100
200 + 100
500 + 100
250 + 100
250 + 100
600 + 100
30 k - 100 k 0.35 % + 100 0.4 % + 100
1 - 10 200 + 100 250 + 100
10 -10 k
10 k - 30 k
200 + 100
500 + 100
250 + 100
600 + 100
10 - 2 k
2 k - 10 k
10 k - 30 k
10 - 2 k
2 k - 10 k
250 + 100
250 + 100
600 + 100
0.4 % + 100
250 + 100
250 + 100
600 + 100
0.4 % + 100
250 + 100
250 + 100
600 + 100
475 + 100
475 + 100
650 + 100
290 + 100
280 + 100
650 + 100
500 + 100
500 + 100
710 + 100
0.4 % + 100 0.4 % + 100
310+ 100
300 + 100
710 + 100
0.4 % + 100 0.4 % + 100
290 + 100 310 + 100
250 + 100
600 + 100
290 + 100
625 + 100
500 + 100 600 + 100
600 + 100 700 + 100
0.25 % + 100 0.3 % + 100
700 + 100
0.2 % + 100
600 + 100
700 + 100
0.3 % + 100
600 + 100
710 + 100
620 + 100
735 + 100
0.3 % + 100 0.3 % + 100
800 + 100 800 + 100 800 + 100 820 + 100
0.25 % + 100 0.25 % + 100 0.25 % + 100 0.25 % + 100
1 - 10
10 - 10 k
10 k - 30 k
250 + 120
30 k - 100 k 0.35 % + 120 0.4 % + 120
1 - 10
10 - 10 k
10 k - 30 k 600+ 120 700 + 120
30 k - 100 k 0.35 % + 120 0.4 % + 120
1 - 10
10 - 10 k
10 k - 30 k
10 - 2 k
2 k - 10 k
10 k - 30 k
10 - 2 k
2 k - 10 k
250 + 120
600 + 120
250 + 120
250 + 120
300 + 120
300 + 120
700 + 120
300 + 120
300 + 120
300 + 120
300 + 120
700 + 120
0.4 % + 120
300 + 120
300 + 120
700 + 120
0.4 % + 120
590 + 120
590 + 120
775 + 120
620 + 120
620 + 120
800 + 120
0.4 % + 120 0.4 % + 120
380 + 120
340 + 120
400 + 120
370 + 120
775 + 120 800 + 120
0.4 % + 120 0.4 % + 120
250 + 120
250 + 120
600 + 120
600 + 120
300 + 120
300 + 120
700 + 120
700 + 120
700 + 120 800 + 120
0.25 % + 120 0.3 % + 120
800 + 120
0.2 % + 120
300 + 120
300 + 120
700 + 120
700 + 120
800 + 120
0.3 % + 120
380 + 120
305 + 120
700 + 120
705 + 120
400 + 120
360 + 120
740 + 120
725 + 120
815 + 120 860 + 120
0.3 % + 120 0.3 % + 120
900 + 120 900 + 120 900 + 120 920 + 120
0.25 % + 120 0.25 % + 120 0.25 % + 120 0.25 % + 120 http://www.elso.sk
1-13
riešenia na presné meranie
8508A
Service Manual
AC Current (Secondary Specifications)
[1] [2] [6] [9]
Range Frequency
200
μ
A, 2 mA &
20 mA
200 mA
2 A
20 A
1 - 10
10 - 10 k
10 k - 30 k
30 k - 100 k
1 - 10
10 - 10 k
10 k - 30 k
10 - 2 k
2 k - 10 k
10 k - 30 k
10 - 2 k
2 k - 10 k
10
10
12
40
10
15
15
10
15
20
20
25
Temperature Coefficient
5 °C - 15 °C
30 °C - 40 °C
± ppm Reading/°C
15
15
20
60
15
20
20
15
20
30
25
30
Range
200
μ
A
2 mA
20 mA
Input Impedance (
Ω
)
Front Rear
150 150
15.2
1.8
1.2
15.2
1.9
1.3
0.3
0.04 -
0.4
Type
........................................................................ True rms, AC coupled. DC coupled gives
(ac
2 + dc
2
)
Crest Factor
........................................................... 3:1 at 50 % range, 1.5:1 at full range
Protection
Front Input............................................................... 20 A rms
Rear Input ............................................................... 2 A rms, Rear Panel Fuse
Settling Time
200
μ
A to 200 mA Ranges 2 A Range to 100 ppm of step
100 Hz filter............................................................. < 0.5 s to 100 ppm of step to 300 ppm of step
< 1 s
20 A Range (at 10 A)
< 1 s
40 Hz filter............................................................... < 1.25 s < 2 s < 2 s
10 Hz filter............................................................... < 5 s
1 Hz filter................................................................. < 50 s
< 10 s
< 50 s
< 10 s
< 50 s
1-14 http://www.elso.sk
riešenia na presné meranie
Introduction and Specifications
Specifications
1
Resistance
Scale
[15]
Mode
[10]
Resistance
[1] [2] [3] [9]
Uncertainty Relative to Cal Stds Absolute Uncertainties
± (ppm Reading + ppm Range)
[4]
24 hour
TCal ±1 °C
90 day
TCal ±1 °C
365 day
TCal ±1 °C
365 day
TCal ±1 °C
365 day
TCal ±5 °C
200
Ω
2 k
Ω
20 k
Ω
200 k
Ω
2 M
Ω
20 M
Ω
200 M
Ω
2 G
Ω
20 M
Ω
200 M
Ω
2 G
Ω
20 G
Ω
2
Ω
20
Ω
200
Ω
2 k
Ω
20 k
Ω
200 k
Ω
2 M
Ω
20 M
Ω
200 M
Ω
2 G
Ω
2
Ω
20
Ω
95% Confidence Level
2
Ω
20
Ω
200
Ω
2 k
Ω
20 k
Ω
200 k
Ω
2 M
Ω
20 M
Ω
200 M
Ω
2 G
Ω
2
Ω
20
Ω
200
Ω
2 k
Ω
20 k
Ω
200 k
Ω
2 M
Ω
20 M
Ω
200 M
Ω
2 G
Ω
20 M
Ω
200 M
Ω
2 G
Ω
20 G
Ω
1.999 900 00
19.999 000 0
199.990 000
1.999 900 00
19.999 000 0
199.990 000
1.999 900 00
19.999 000 0
199.990 000
1.999 900 00
1.999 900 00
19.999 000 0
199.990 000
1.999 900 00
19.999 000 0
199.990 000
1.999 900 00
19.999 000 0
199.990 000
1.999 900 00
19.999 000 0
199.990 000
1.999 900 00
19.999 000 0
99% Confidence Level
1.999 900 00
19.999 000 0
199.990 000
1.999 900 00
19.999 000 0
199.990 000
1.999 900 00
19.999 000 0
199.990 000
1.999 900 00
1.999 900 00
19.999 000 0
199.990 000
1.999 900 00
19.999 000 0
199.990 000
1.999 900 00
19.999 000 0
199.990 000
1.999 900 00
19.999 000 0
199.990 000
1.999 900 00
19.999 000 0
Normal
Normal
Normal
Normal
Normal
Normal
Normal
Normal
Normal
Normal
Lo Current
Lo Current
Lo Current
Lo Current
Lo Current
Lo Current
Lo Current
Lo Current
Lo Current
Lo Current
5.0 + 2.0
2.5 + 0.7
1.5 + 0.25
1.0 + 0.25
1.0 + 0.25
1.0 + 0.25
2.0 + 0.5
3.5 + 5.0
20 + 50
250 + 500
5.0 + 2.0
2.5 + 0.7
2.5 + 0.7
2.5 + 0.7
2.5 + 0.7
5.0 + 0.5
7.0 + 0.5
20 + 5.0
250 + 500
250 + 500
High Voltage 2.0 + 0.5
High Voltage 3.5 + 5.0
High Voltage 20 + 50
High Voltage 250 + 500
Normal
Normal
Normal
Normal
Normal
Normal
Normal
Normal
Normal
Normal
Lo Current
6.0 + 2.5
3.0 + 0.9
1.8 + 0.3
1.2 + 0.3
1.2 + 0.3
1.2 + 0.3
2.5 + 0.6
4.5 + 6.0
25 + 60
325 + 600
6.0 + 2.5
Lo Current
Lo Current
Lo Current
Lo Current
Lo Current
Lo Current
Lo Current
Lo Current
3.0 + 0.9
3.0 + 0.9
3.0 + 0.9
3.0 + 0.9
6.0 + 0.6
8.0 + 0.6
25 + 6.0
325 + 600
Lo Current 325 + 600
High Voltage 2.5 + 0.6
High Voltage 4.5 + 6.0
High Voltage 25 + 60
High Voltage 325 + 600
10 + 2.5
5.5 + 0.9
5.0 + 0.3
4.5 + 0.3
4.5 + 0.3
4.5 + 0.3
5.0 + 0.6
7.5 + 6.0
30 + 60
450 + 600
10 + 2.5
5.5 + 0.9
6.5 + 0.9
6.5 + 0.9
6.5 + 0.9
8.0 + 0.6
10.0 + 0.6
25 + 6.0
450 + 600
450 + 600
5.0 + 0.6
7.5 + 6.0
30 + 60
450 + 600
8.0 + 2.0
4.5 + 0.7
4.0 + 0.25
3.5 + 0.25
3.5 + 0.25
3.5 + 0.25
4.0 + 0.5
6.0 + 5.0
25 + 50
350 + 500
8.0 + 2.0
4.5 + 0.7
5.0 + 0.7
5.0 + 0.7
5.0 + 0.7
6.5 + 0.5
8.0 + 0.5
20 + 5.0
350 + 500
350 + 500
4.0 + 0.5
6.0 + 5.0
25 + 50
350 + 500
12 + 2.5
8.5 + 0.9
8.5 + 0.3
8.5 + 0.3
8.5 + 0.3
8.5 + 0.3
8.5 + 0.6
12 + 6.0
35 + 60
650 + 600
12 + 2.5
8.5 + 0.9
8.5 + 0.9
8.5 + 0.9
8.5 + 0.9
9.0 + 0.6
12.0 + 0.6
30 + 6.0
650 + 600
650 + 600
8.5 + 0.6
12 + 6.0
35 + 60
650 + 600
10 + 2.0
7.0 + 0.7
7.0 + 0.25
7.0 + 0.25
7.0 + 0.25
7.0 + 0.25
7.0 + 0.5
9.0 + 5.0
30 + 50
500 + 500
10 + 2.0
7.0 + 0.7
7.0 + 0.7
7.0 + 0.7
7.0 + 0.7
7.0 + 0.5
9.0 + 0.5
25 + 5.0
500 + 500
500 + 500
7.0 + 0.5
9.0 + 5.0
30 + 50
500 + 500
19 + 2.5
11.5 + 0.9
9.5 + 0.3
9.5 + 0.3
9.5 + 0.3
9.5 + 0.3
10.5 + 0.6
20 + 6.0
75 + 60
675 + 600
19 + 2.5
11.5 + 0.9
9.5 + 0.9
9.5 + 0.9
9.5 + 0.9
9.5 + 0.6
13.0 + 0.6
45 + 6.0
670 + 600
675 + 600
19 + 0.6
75 + 6.0
195 + 60
675 + 600
15 + 2.0
9.0 + 0.7
7.5 + 0.25
7.5 + 0.25
7.5 + 0.25
7.5 + 0.25
8.5 + 0.5
15 + 5.0
60 + 50
525 + 500
15 + 2.0
9.0 + 0.7
7.5 + 0.7
7.5 + 0.7
7.5 + 0.7
7.5 + 0.5
10 + 0.5
35 + 5.0
515 + 500
525 + 500
15 + 0.5
60 + 5.0
150 + 50
525 + 500
17 + 2.0
9.5 + 0.7
8.0 + 0.25
8.0 + 0.25
8.0 + 0.25
8.0 + 0.25
9.0 + 0.5
20 + 5.0
120 + 50
1510 + 500
17 + 2.0
9.5 + 0.7
8.0 + 0.7
8.0 + 0.7
8.0 + 0.7
8.0 + 0.5
15 + 0.5
90 + 5.0
1505 + 500
1510 + 500
17 + 0.5
65 + 5.0
180 + 50
1510 + 500
22 + 2.5
12.0 + 0.9
10 + 0.3
10 + 0.3
10 + 0.3
10 + 0.3
12 + 0.6
25 + 6.0
150 + 60
1810 + 600
22 + 2.5
12.0 + 0.9
10.0 + 0.9
10.0 + 0.9
10.0 + 0.9
10.0 + 0.6
17.0 + 0.6
110 + 6.0
1810 + 600
1810 + 600
20 + 0.6
80 + 6.0
230 + 60
1810 + 600 http://www.elso.sk
1-15
riešenia na presné meranie
8508A
Service Manual
Resistance - Normal Mode (Secondary Specifications)
[1] [2] [3] [10]
Transfer Uncertainty
20 mins ±1 °C
± (ppm Reading
+ ppm Range)
Temperature Coefficient
15 °C - 30 °C
5 °C - 15 °C
30 °C - 40 °C
± ppm Reading/°C
2
Ω
20
Ω
200
Ω
2 k
Ω
100 mA
10 mA
10 mA
1 mA
20 k
Ω
100
200 k
Ω
100
2 M
Ω
10
20 M
Ω
1
200 M
Ω
2 G
Ω
100 nA
10 nA
2.0 + 2.0
0.8 + 0.7
0.2 + 0.15
0.2 + 0.15
0.2 + 0.15
0.2 + 0.15
0.5 + 0.5
2.5 + 5
15 + 50
200 + 500
1.5
0.6
0.5
0.5
0.5
0.5
0.6
2
20
200
Resistance - Lo Current Mode (Secondary Specifications)
[1] [2] [3] [10]
2.5
1.0
0.8
0.8
0.8
0.8
1.0
3
30
300
Transfer Uncertainty
20 mins ±1 °C
± (ppm Reading
+ ppm Range)
Temperature Coefficient
15 °C - 30 °C
5 °C - 15 °C
30 °C - 40 °C
± ppm Reading/°C
2
Ω
20
Ω
100 mA
10 mA
200
Ω
1 mA
2 k
Ω
100
20 k
Ω
10
200 k
Ω
10
2 M
Ω
1
20 M
Ω
100 nA
200 M
Ω
2 G
Ω
10 nA
10 nA
2.0 + 2.0
0.8 + 0.7
0.8 + 0.7
0.8 + 0.7
0.8 + 0.7
0.5 + 0.5
2.0 + 0.5
15 + 5
200 + 500
200 + 500
1.5
0.6
0.6
0.6
0.6
0.6
2
20
200
200
Resistance - High Voltage Mode (Secondary Specifications)
[1] [2] [3]
2.5
1.0
1.0
1.0
1.0
1.0
3
30
300
300
Range
[9]
Transfer Uncertainty
20 mins ±1 °C
± (ppm Reading
+ ppm Range)
20 M
Ω
10
200 M
Ω
1
2 G
Ω
100 nA
20 G
Ω
10 nA
0.5 + 0.5
2.0 + 0.5
15 + 50
200 + 500
Temperature Coefficient
15 °C - 30 °C
5 °C - 15 °C
30 °C - 40 °C
± ppm Reading/°C
0.6
2.0
20
200
1.0
3
30
300
Type
........................................................................ True 4-wire with Ohms guard. 2-wire selectable.
Max Lead Resistance
............................................ 10
Ω
in any or all leads, 1
Ω
on 2
Ω
range
Full Scale Measurement Voltage
Normal Mode .......................................................... 200 mV/2 V/20 V
Lo Current Mode ..................................................... 200 mV/2 V
High Voltage Mode ................................................. 200 V
Protection
(All ranges) .......................................... 250 V rms, 360 V pk
Ratio Accuracy
Range to Range...................................................... ±(Net Front Input Accuracy + Net Rear Input Accuracy)
Within Range .......................................................... Apply 24 hour or 20 minute Transfer Uncertainty specifications
Settling Time
......................................................... Up to 200 k
Ω
range generally the same as DC Voltage Filter In but depends on external connections
1-16 http://www.elso.sk
riešenia na presné meranie
Introduction and Specifications
Specifications
1
Temperature
Resistance Range
95% Confidence Level
0 - 199.990 000
Ω
Temperature Readout
[1] [2] [3]
Typical Equivalent Temperature Measurement Uncertainty
[12]
Absolute Resistance
Measurement Uncertainty
365 day Tcal ±1 °C
[4]
±(ppm Reading + m
Ω
)
[11]
Probe Type
Nominal
Temperature
(°C)
Resistance
(
Ω
)
Accuracy
± (°C)
7.5 + 0.14 -200
0
5
25
0.0085
0.0035
200 - 1999.900 00
Ω
99% Confidence Level
0 - 199.990 000
Ω
200 - 1999.900 00
Ω
7.5 + 0.5
9.5 + 0.18
9.5 + 0.6
25
Ω
PRT/SPRT
25
Ω
PRT/SPRT
25
Ω
PRT/SPRT
100
Ω
PRT/SPRT
100
Ω
PRT/SPRT
100
Ω
PRT/SPRT
100
Ω
PRT/SPRT
25
Ω
PRT/SPRT
25
Ω
PRT/SPRT
25
Ω
PRT/SPRT
100
Ω
PRT/SPRT
100
Ω
PRT/SPRT
100
Ω
PRT/SPRT
100
Ω
PRT/SPRT
660
-200
0
232
400
-200
0
660
-200
0
232
400
84
20
100
185
250
5
25
84
20
100
185
250
0.0025
0.0035
0.0025
0.0020
0.0025
0.0010
0.0040
0.0025
0.0040
0.0025
0.0020
0.0025
Temperature Readout (Secondary Specifications)
[1] [2] [3]
Resistance Range
0 - 199.990 000
Ω
200 - 1999.900 00
Ω
Transfer Uncertainty
20 Minute ±1 °C
±(ppm Reading + m
Ω
)
[11]
0.8 + 0.14
0.2 + 0.5
Resistance Measurement Uncertainty
2-Wire
Adder
(
Ω
)
3-Wire
Adder
(
Ω
)
Temp Coeff. ± ppm Reading/°C
15 °C - 30 °C
5 °C - 15 °C
30 °C - 40 °C
0.1
0.1
0.005
0.005
0.6
0.5
1.0
0.8
Type
....................................................................... 4-wire current reversal resistance measurement with readout of equivalent temperature. 2-wire and 3-wire selectable without current reversal. Refer to Resistance specifications for additional details.
Temperature Range
.............................................. -200 °C to 660 °C, readout also available in °F or K.
Linearization
......................................................... ITS-90 or Callendar van Dusen. Entry and storage of coefficients and nominal resistance for up to 100 probes.
Current Source
..................................................... 1 mA http://www.elso.sk
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Read Rate and Additional Uncertainty
Read Rate and Additional Uncertainty
Function Resolution
Filter
Frequency (Hz)
Read Rate
(readings/second)
Additional Errors
[13]
± (ppm Reading + ppm Range)
Normal Fast Normal Fast
DCV, DCI & Ohms
[10]
ACV & ACI
[6]
ACV Transfer Off
[6]
PRT & Tru Ohms
[14]
8
7
6
5
1/25
1/6
2
35
1/6
1/2
35
150
0 + 0
0 + 0.1
1.0 + 0.5
0 + 5
6 1 1/50 0
10
40
1/5
1/2
0 + 0
0 + 0
100 1 0 + 0
5 1 1/50 5
10
40
1/5
1/2
0 + 5
0 + 5
0 + 0.1
0 + 0.5
0 + 2.5
0 + 25
7
6
5
8
100 2 0 + 5
20
10
40
100
-
1/2.5
1
4
1/90 1/30
200 + 20
200 + 20
200 + 20
0 + 0
-
-
-
1/30
1/4
1/3
1/10
1/3
1/3
0 + 0.1
1.0 + 0.5
0 + 5
Notes to Performance Specifications
Fluke guarantees 8508A performance verification using specifications stated to 99 % confidence level.
[1] Specifications apply for max resolution in each function, normal mode
[2] Assumes 4 hour warm-up period
[3] Input zero or offset null required whenever the temperature moves more than ±1 °C from the temperature at which the previous null/zero was performed
[4] TCal = Ambient calibration temperature
[5] Integration time >1 Power Line cycle
[6] Valid for signals >1 % Full Scale, Transfer Mode On. Signals must be DC coupled <40 Hz. Readings invalid with Transfer Mode On and 1Hz filter selected when using internal trigger mode
[7] Max Volt.Hertz 3 x 10
7
[8] >300 V, <10 kHz add: ±0.0004 x (Reading-300)
>300 V, >30 kHz add: ±0.0024 x (Reading-300)
2
2
ppm
>300 V, 10 kHz - 30 kHz add: ± (0.0004 + (Frequency - 10000) x10
ppm
-7
) x (Reading-300)
2 ppm
[9] Typical below 10 Hz for ACV, below 10 Hz and above 10 kHz for ACI, and above 2 G
Ω
for Resistance
[10] Tru Ohms mode available on 2
Ω
to 20 k
Ω
ranges. Read Rate reduced in Tru Ohms Mode. Specification for Tru Ohms same as corresponding Normal or Lo Current range
[11] Valid for 4-wire sensor
[12] Not including sensor uncertainty
[13] Assume Range and Full Scale = 2000 V when calculating for 1000 V Range. For DCI, additional errors only apply in 5 digit resolution
[14] Fast mode not available in PRT
[15] The maximum display value for the Analog to Digital converter is 199 990 000 counts. This sets the maximum value measurable on each range to be a one followed by four nines. For example, the maximum measured values on the 2 V range on DC Voltage are
±1.999 900 00 V. However, the 1000 V ranges are limited to a maximum 1050 V.
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Introduction and Specifications
Applying the Specifications
1
Applying the Specifications
Introduction
The Fluke 8508A has been designed specifically for metrologists. Not only does it provide the performance metrologists need, but it is specified in a way to allow users to really understand the uncertainties of the measurements, and easily make allowance for those uncertainty contributions when performing measurement uncertainty analyses and compiling uncertainty budgets. Contemporary metrology practices, including ISO17025 based laboratory accreditation schemes, require uncertainty analysis to be performed in accordance with the statistically based techniques described in the ISO Guide to the
Expression of Uncertainty in Measurement (often referred to as the ‘GUM’). For convenience, the 8508A specifications are quoted at a coverage factor of k=2, equivalent to a confidence level of approximately 95 %, as required by these methods.
Specifications are also provided at a confidence level of 99 %.
Performance specifications for the 8508A consist of two elements, the first is a contribution expressed as parts-per-million of the Reading, and the second contribution is expressed as parts-per-million of the Range. These must be evaluated and combined for the relevant reading and range values applicable to the measurement being made, ensuring that both elements are evaluated on the same basis, such as parts per million of the measured value or in absolute terms (volts, amps, ohms, etc). The two elements are combined by adding algebraically. For example measuring 10 V on the 20 VDC range and applying the 365 day
±
1
°
C specifications:
First, expressing the contributions in terms of parts-per-million of the measured value:
= ±
3 .
0
+
0 .
2 x
20
10
= ±
(
3 .
0
+
0 .
4
)
= ±
3 .
4 ppm of 10 V
Second, expressing the contributions in volts:
= ±
(
3 .
0 x 10
−
6 x 10
+
0 .
2 x 10
−
6 x 20
)
= ±
3 .
4 x 10
−
5 = ±
34 μ V
The 8508 is designed to provide accuracy and stability without the need for internal auto or self calibration routines which may otherwise compromise the continuity and traceability of measurement performance history. To realise the full potential of the
8508A performance accepted metrology practices should be employed, such as performing a zeroing or null operation to remove any offsets present in the measurement setup when making DC measurements. The 8508A specifications assume that these methods are employed.
Absolute and Relative Specifications
The Relative to Calibration Standards specifications describe the performance of the
8508A itself for the time periods and temperature range listed excluding the uncertainty of the standards used to perform calibration of the 8508A during manufacture. The
Absolute specifications include the uncertainty of the standards used to perform calibration of the 8508A at manufacture and may be used to determine the uncertainty of measurements made with the 8508A for periods up to 1 year and over a temperature range of
±
5
°
C from calibration. If the user has their 8508A calibrated with different uncertainties, the Relative specifications can be combined with the uncertainties applicable to that calibration to determine the effective absolute uncertainty following that calibration. http://www.elso.sk
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1-20
Applying User’s Calibration Uncertainties
When the 8508A is calibrated by another laboratory the uncertainties of the calibration standards used may be applied by combining those uncertainties with the 8508A’s
Relative to Standards specifications. The applicable calibration uncertainties and the
8508A relative specifications must both be expressed at the same confidence level, and be combined in a RSS (Root Sum Square) summation. Accepted metrology practice mandates that calibration uncertainties are stated at 95 %. Check the applicable calibration uncertainties are stated at 95 % and then combine them with the 8508A 95 %
Relative specifications. For example, if the 8508A is calibrated at 10 V DC with an uncertainty of 1.5 ppm at 95 %: The absolute uncertainty at 10 V for a period of 90 days and
±
1
°
C from calibration is:
= ±
1 .
5
2
+
⎛
⎝
1 .
4
+
0 .
2
×
20
10
2
= ±
2 .
3 ppm of 10 V
Operating and Calibration Temperature Ranges
As a metrology tool, the 8508A will commonly be used in a calibration laboratory where the temperature would be controlled to
±
1
°
C, and the 8508A
±
1
°
C specifications are applicable to those situations. The majority of electrical calibration laboratories operate at a nominal temperature of 23
°
C, the temperature at which the 8508A is calibrated by
Fluke during manufacture and service. The 8508A is also capable of being calibrated at any temperature between 20
°
C and 25
°
C and the
±
1
°
C specifications will apply to operation within
±
1
°
C of that calibration temperature. In the 8508A specification tables the temperature of calibration is referred to as TCal. Specifications for
±
5
°
C are provided for situations where the 8508A is operated in environments with wider temperature variations up to
±
5
°
C. For applications where the knowledge of the effect of temperature on 8508A performance is important, temperature coefficients are listed in the
8508A specifications. If the operating temperature is within the range 15
°
C to 30
°
C the
15
°
C to 30
°
C temperature coefficient specifications are applicable otherwise use the
5
°
C to 15
°
C/30
°
C to 40
°
C figures, provided the temperature lies within that range. The
8508A may be operated at temperatures between 0
°
C and 50
°
C, but performance is not specified outside the range 5
°
C to 40
°
C.
Applying Temperature Coefficient Specifications
The 8508A specification tables include information for the typical operating conditions of
±
1
°
C for calibration laboratories with tight temperature control, and
±
5
°
C for calibration laboratories with looser temperature control or uncontrolled environments within that temperature range. For the majority of applications choosing the Absolute specifications for the most appropriate operating temperature range will be adequate.
However performance at other temperatures may be determined by including an allowance for temperature coefficient over the additional temperature range. Care should be taken when making this calculation as an amount of temperature coefficient is already included in the 8508A specifications and those specifications are themselves based on combining contributions using techniques similar to those employed in uncertainty analysis. For example, consider operating at 33
°
C, 10
°
C from the 23
°
C calibration temperature. The
±
5
°
C specifications already include a contribution for 5
°
C of temperature difference, so this amount of temperature effect must be removed before the effect of the 10
°
C difference is added. Consider 10 V on the 20 VDC range: 365 day absolute specification (95 %) at 33
°
C expressed in parts-per-million of 10 V is:
= ±
3 .
5
+
0 .
2
×
20
10
2
−
(
5 x 0 .
3
) (
10 x 0 .
5
)
2 = ±
6 .
16 ppm of 10 V http://www.elso.sk
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Introduction and Specifications
Applying the Specifications
1
Ratio Measurements
The 8508A Ratio mode will automatically take measurements of inputs applied to the front and rear terminals and display the result as a ratio in the voltage and resistance functions. The measurements can be made on the same range or different ranges. When making measurements on different ranges the error in each measurement is evaluated by applying the relevant specification for each range and combining the two specifications in an RSS summation, expressing the contributions in parts-per-million of the measured values. For example, making measurements of the ratio of 100 mV on the 200m VDC range and 100 V on the 200 VDC range, applying the 365 day
±
1
°
C Absolute specifications:
= ±
⎛
⎜⎜
4 .
5
+
0 .
5 x
200
100 x 10
−
3 x 10
−
3
⎞
⎟⎟
2
+
4 .
5
+
0 .
2 x
200
100
2
= ±
7 .
37 ppm of the ratio
Making measurements on the same range will eliminate range to range errors, such as drift since the time of calibration, and improve the result. When making measurements on the same range these errors will affect both measurements and effectively cancel, leaving short term noise and linearity as the dominant errors. The 20 minute Transfer Uncertainty
Specifications are provided to describe the performance obtained when making ratio measurements on the same range. The error in each measurement is evaluated by applying the relevant 20 minute Transfer Uncertainty Specification for each value and combining the two specifications in an RSS summation, expressing the contributions in parts-per-million of the measured values. If the measurements are made within the same range, but independently (not using the ratio mode) with an elapsed time greater than 20 minutes but less than 24 hours between the measurements, then the 24 hour specifications should be applied instead.
For example, making measurements of the ratio of 5 V and 10 V on the 20 VDC range, applying the 20 minute Transfer Uncertainty specifications:
= ±
0 .
12
+
0 .
1 x
20
5
2
+
0 .
12
+
0 .
1 x
20
10
2
= ±
0 .
61 ppm of the ratio
Additional Errors
The 8508A specifications are listed for the maximum resolution in each function, using the Normal reading mode. For measurements taken in other resolutions or the Fast read mode additional error contributions listed in the Read Rate and Additional Uncertainty table must be included. These additional contributions must be added algebraically to the relevant specifications. For example measuring 10 V on the 20 VDC range at 5 digit resolution in Fast mode and applying the 365 day
±
1
°
C Absolute specifications:
= ±
(
3 .
0
+
0
) (
0 .
2
+
25
) x
20
10
= ±
(
3 .
0
+
50 .
4
)
= ±
53 .
4 ppm of 10 V
Other additional contributions apply in certain situations and are also to be added algebraically to the relevant specifications. These additional contributions include the DC
Accuracy specification to be applied when making DC measurements on the AC Voltage function when DC coupled, and the High Voltage adder when making measurements above 300 V on the AC Voltage function. http://www.elso.sk
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Chapter 2
Theory of Operation
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Theory of Operation
Introduction
2
Introduction
This chapter provides a board-level theory of operation for the 8508A Reference
Multimeter. Functional block diagrams supplement the text when appropriate. In addition to providing a conceptual overview of the Multimeter’s operation, the descriptions are helpful for troubleshooting and isolating problems to a board level.
Reference Designators are used throughout this chapter to identify the major Printed
Circuit Assemblies (PCAs) used in the Multimeter. These reference designators also appear in the List of Repaceable Parts (Chapter 5) to simplify the process of purchasing replacement modules and PCAs.
Overall Functional Description
Main Assemblies
Refer to the functional block diagram shown in Figure 2-1 while reading this description.
In addition to identifying all of the assemblies contained in the Multimuter, this diagram provides a functional view of the data flow between the assemblies. Assembly interconnections and cable identification is detailed in chapter 4, Maintenance.
The following list identifies the six major assemblies contained in the Multimeter and includes a description of the basic functions each assembly performs:
A1
A2
A3
A4
A5
DC PCA
AC PCA
Ohms PCA
Digital PCA
Bezel Assembly
Optical isolation; measurement configuration; V dc, I dc and I ac measurements
True-rms measurement
Resistance measurements: 2-wire, 4-wire, high-voltage, ratio, etc.
Out-guard power supplies, control of IEEE (GPIB) and serial data (measurement and control)
Front panel user interface, display and keyboard, includes the A5A1 Display PCA.
A6 Rear Input Assembly
(optional)
Rear input connections, includes the A6A1 Rear Input PCA.
Normal operator interaction with the Multimeter begins at the front panel (A5) which includes a keyboard for entering measurement configurations (functions, ranges, etc.) and a display for verifying the selected configurations and for displaying measurement results. Both the keyboard switches and the display are included on the A5A1 Display
PCA. A rubber keypad, whose keys include a conductive backing, provides switching information to A5A1. A controller on the A4 Digital PCA provides the addressing, strobing, and storage of data coming from and going to the A5A1 Display PCA. The data stored on the A4 Digital PCA includes both the manually entered configuration data for use by the display and other assemblies, as well as, the resulting measurement data for use by the display as measurement results.
Before being used by the Multimeter, the stored configuration data is converted on the
A4 Digital PCA from a parallel to serial format. Similarily, the A4 Digital PCA receives serial measurement data from the instrument and converts it to a parallel format for use as display data. A rear panel IEEE-488 (GPIB) bus is intergrated into the format conversion process. http://www.elso.sk
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AC
AC + DC
2-Wire
4-Wire
Range
-15 V
A3 Ohms PCA
I to R Converter
Range Selection
A2 AC PCA
AC
Preamp
Rectifier
RMS
Converter
Lo-Pass
Filter
Output
Buffer
A1 DC PCA
Range Selection
DC V
I DC and
I AC
10:1
Range Switched
Precision Shunts
DC
Preamp
DC AMP
(Chopper
Stabilized)
Input Signal
Switching Relays
Relay Control and
Relay Drivers
Optically Isolated
Serial Interface
AD MUX
A to D
Converter
(ADC)
Internal
Reference
In-guard
Out-guard
A4 Digital PCA
Out-Guard Power Supply
+5 V +8 V, +17 V
Keyboard and
Display Memory
IEEE (GPIP) to
Serial
In-guard
Power Supplies
250 VAC
+5 V +8 V
+15 V
+36 V
–8 V
Line
Power
Rear Panel
IEEE-488
(GPIB)
2-4
A6 Rear Input
Assembly
A5 Bezel Assembly and
A5A1 Display PCA
Figure 2-1. 8508A Functional Block Diagram
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Theory of Operation
Overall Functional Description
2
A 16-pin cable (W3) enables serial control and measurement data to move between the
A4 Digital PCA and the A1 DC PCA. Opto-isolators on the A1 DC PCA optically isolate the external control and display circuits of the Multimeter from the measurement circuits.
This isolation minimizes problems associated with noise and current loops in the measurement circuits. Throughout this chapter, this isolation is referred to as in-guard
(measurement circuits) and out-guard (control and data transfer circuits).
Control data from the A4 Digital PCA passes through the opto-isolators and serves as input to a series of tri-state latches. These latches retain the control data, and they provide the input to a series of relay drivers, which in turn drive a series of configuration relays.
These relays establish the necessary connections between the various assemblies to perform the measurement called for from the front panel keyboard (or GPIB inputs).
These relays also route analog data (and associated guarding) from the input terminals
(front and rear) to the appropriate assemblies as defined by the measurement control data.
The A1 DC PCA, in addition to switching the measurement configurations and the routing of input and measurement signals, includes the circuits to perform the following functions:
•
DC measurements
Handles both DC voltage and dc current measurements
•
Analog to digital conversion (ADC)
The ADC processes all measurement data (volts, ohms, and current) before routing it
(in digital form) to the A4 digital PCA for display and GPIB access.
•
Current to voltage conversion
Both the ac and dc current measurement functions (IDC and IAC) use the same current shunts.
•
Self-Test
Produces a variety of reference signals from -10 to +10 volts and places them on the internal signal bus for measurement and display. These tests provide a high degree of certainty that the Multimeter is functioning correctly, and they are useful for troubleshooting to the board level.
The A2 AC PCA performs the ac voltage and ac current measurements. The ac voltage portion of the assembly includes an associated collection of range, configutation, and filter circuits, as well as an ac preamplifier, and an rms-to-dc converter. The output of the rms-to-dc converter is a dc voltage proportional to the true-rms value of the input signal.
The multiplexer on the A1 DC PCA receives the dc voltage and routes it to the ADC
(Analog-to-Digital Converter) which, in turn, sends the digital results to the opto isolators. The opto isolators couple the digital data to the A4 Digital PCA for access by the display and GPIB.
The A1 DC PCA provides the configuration control required to connect the ac input signal to the A2 AC PCA. For ac voltage measurements the input signal is routed in much the same manner as a dc measurement signal. For ac current measurements, the ac input current is routed through the same set of current shunts used to make dc current measurements. To measure the ac current, the A2 AC PCA measures the voltage drop across the shunt and sends the results to the A4 Digital PCA as when making an ac voltage measurement.
The A3 Ohms PCA performs 2-wire, 4-wire, high-voltage, and ratio measurements. All of these measurements derive the unknown resistance value by passing a constant stimulus current through the unknown resistor and measuring the resulting voltage drop across it. By limiting the current to a value of 1X10 , the voltage drop is equal to the resistance value, e.g., 1 mA through 2.12 k
Ω
= 2.12 V. To accommodate range changes, the reference current changes to match the selected range. The reference current starts at
2nA for the 2 G
Ω
range and increases to .1 mA for the 2
Ω
range. A high-gain inverting amplifier with low-input current and low-offset voltage performs the voltage http://www.elso.sk
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measurement across the unknown resistor. Configuration relays on the A1 DC PCA perform the change in terminal connections between two- and four-wire measurements.
The A3 Ohms PCA includes an alternative high-resistance measurement feature for resistance measurements above 20 M
Ω
. These measurements use 10 times the standard stimulus current and result in a 10 times increase in the voltage across the resistor. This high-voltage resistance feature enables the Multimeter to make quiter and faster measurements. It also enables the inclusion of a 20 G
Ω
resistance range.
Another feature included on the A3 Ohms PCA is true-ohms. This feature eliminates the input offset-voltage from the measurement circuit by continuously reversing the direction of current flow through the unknown resistence. The stimulus current reversal is timed so that the current flows continuously thus maintaining identical and constant self-heating of the unknown in both forward and reverse measurements. To ensure same-polarity measurements, voltage sensing of the unknown resistor synchronously reverses with the current.
The true-ohms ratio function uses a similar current reversal process. However, the current is applied to both unknown resistors simultaneously.
Power Supplies
The Multimeter has two types of power supplies, out-guard supplies and in-guard supplies. The out-guard supplies provide power for the digital (earth ground) side of the
Multimeter. This includes the A4 Digital PCA, the A5A1 Display (and keyboard), and the opto couplers on the A1 DC PCA. The in-guard supplies provide power for the analog
(measurement) side of the Multimeter. This includes the A1 DC PCA, the A2 AC PCA, and the A3 Ohms PCA.
Two chassis-mounted transformers (T1 and T2) are the source of all the various voltages required for operation of the Multimeter. See Figure 2-2. Transformer T2 is the fused line-powered (mains) transformer. It has a single 24 V center-tapped secondary which provides ac power for both the out-guard and in-guard power supplies. On the A4 Digital
PCA, the 24 V ac drives three conventional rectifiers and regulators to provide +5 V,
+8 V, and +17 V sources for the out-guard circuits. The +5 and +8 volts provide power for out-guard digital logic circuits; the +17 volts, along with a driver on the A4 Digital
PCA, supplies the power (17 V ac) to drive the primary of the in-guard transformer T1.
Transformer T1 has 3 secondaries which drive a series of conventional rectifiers and regulators located on the A1 DC PCA. These T1 supplies provide the following in-guard operating voltages:
•
+5V dc regulated
•
+8 V dc un-regulated
•
±15 V dc regulated
•
±36 V dc regulated
•
250 Vac
All of the in-guard PCAs use these in-guard voltages, with the exception of the 250 V ac which goes directly to the A3 Ohms PCA where it is rectified and filtered for use in making the high-voltage ohms measurements. The 250 V dc supply is active only when the High Voltage Ohms function is selected.
A few other in-guard voltages, which are uniquely developed and used on the A3 Ohms
PCA, include +5 V, -15 V, ±6 V, and +5.5 V. The in-guard voltages on the A1 DC PCA are the original source driving all of these uniquely developed voltages on the A3 Ohms
PCA.
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Theory of Operation
Overall Functional Description
2
T1
J150
J502
+17 V
J401
250 V ac to
Ohms
PCA
+
-
+
-
+15 V regulator
15 V regulator
+36 V regulator
36 V regulator
+15 V dc
-15 V dc
-18 V dc
+36 V dc
-36 V dc
+8 V dc
+5 V dc
+5 V regulator
In-guard Voltages
Out-guard Voltages
+17 V regulator +17 V dc
F1
T2
J501
+8 V regulator
+8 V dc
Line
Power
+5 V regulator
+5 V dc avw004f.eps
Figure 2-2. Power Supplies - Simplified Block Diagram
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Chapter 3
Calibration and Verification
Accessing the Calibration Menus and Calibration Mode ................................ 3-4
SPOT FREQUENCY (1 to 6) Menu ............................................................... 3-6
Exit From Calibration Mode and Non-Volatile Input Offset Adjustment....... 3-29
Cal Due Date Entry and Calibration Mode Disable ........................................ 3-30
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Applicable Verification Tolerance and Conditions ......................................... 3-32
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Calibration and Verification
Introduction
3
Introduction
This chapter describes the calibration menus, and lists the calibration and performance verification procedures for the Multimeter. Remote commands for calibration of the
Multimeter are described in Chapter 4 of the Users Manual, Remote Operations using the
IEEE 488 Interface. In this chapter, menu and button selections are shown as all-caps text.
Calibration Overview
An electronic autocal feature allows full calibration of all functions of the Multimeter from the front panel (or remotely via the IEEE 488.2 Interface). No hardware adjustments are necessary.
For each combination of function and range, an appropriate calibration standard (source) is input. At each setting, one keystroke immediately calibrates to the standard by updating an internal non-volatile calibration memory. The Multimeter automatically determines whether the operation is to be a Zero or Range Gain calibration; or for AC ranges whether it is to be a Zero, LF Gain or HF Gain calibration. As part of the calibration procedure, a non-volatile input-offset compensation is adjusted independently for the front and rear inputs. The autocal process can operate only when the rear panel
Calibration switch is in the ‘Enable’ position. Applying an integrity seal or calibration sticker to prevent access to the rear panel Calibration switch is a convenient way to ensure the security of calibration. When a calibration operation is performed the
Multimeter’s internal calibration memory is immediately updated. It is possible to calibrate a single range or single point if the user chooses to do so. However, it is recommended that the calibration procedure listed later in this chapter be followed closely.
Calibration Interval and Performance
It is recommended that the Multimeter be calibrated on either a 365-day or 90-day interval depending on the requirements of the applications for which the Multimeter is used and the performance specifications required. The performance of the Multimeter is specified for periods of 365 days and 90 days – if recalibration takes place on a 90-day cycle use the 90-day specifications for improved performance.
During manufacture, the Multimeter is calibrated with low uncertainties, reflected in the
Absolute Specifications listed in Chapter 1 Introduction and Specifications. After recalibration, the user should apply the calibration uncertainties for the calibration standards and for the process applicable to that calibration by combining those calibration uncertainties with the Multimeter Relative to Standards specifications, as described in
Chapter 1.
Many Multimeter owners prefer using Fluke calibration services instead of maintaining their own standards to support their Multimeter.To help ensure optimum performance from the Multimeter, Fluke offers our calibration service at a variety of worldwide locations. Our worldwide service network provides fast efficient calibration to ensure low uncertainties and optimum accuracy consistent with the original calibration at manufacture.
Calibration Points
There is generally more than one calibration point for each range. An initial measurement
(made when the calibration is triggered) determines the intended calibration point. The points for each range and function are listed later in this chapter. http://www.elso.sk
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Non-Nominal Values
The
Set facility allows the user to set the calibration target to the value of the calibration source available. This facility is most useful when the user’s calibration source is not available at the nominal values specified, or when the user has knowledge of the actual output of the calibration source at the required points. In these cases, the use of the
Set facility with a table of errors for the calibration source is recommended and will improve the accuracy of the Multimeter’s calibration.
Enabling Access to Calibration Mode
The setting of a Calibration-switch on the rear panel enables or restricts access to the calibration mode. Setting the switch to
ENABLE
allows access to the calibration mode via the front panel
CAL key and the
CALIBRATION
menu, and also enables the remote IEEE
488 interface calibration commands. Setting the switch to DISABLE and applying an integrity seal or calibration sticker to cover the Calibration switch is a convenient way to ensure the security of calibration and to prevent unauthorized access to the switch.
Calibration Menus
Accessing the Calibration Menus and Calibration Mode
Pressing the
CAL key on the front panel causes the Multimeter to respond as follows:
1.
Enters the calibration (
CAL
) mode
2.
Displays and allows access to the
CALIBRATION
menu
3.
Displays the
CAL legend on the main display
To exit the CALIBRATION menu Press the Quit softkey. On exit the Multimeter displays the prompt to enter a calibration due date.
When in
CAL mode the following front panel keys become inoperative:
CLR
,
TEST
,
OFFSET
,
PRT
and
INPUT
. Also the function of the
SAMPLE
key changes to become the trigger key for initiating a calibration operation.
W
Caution
When in
CAL mode with the
CAL legend appearing on the main display the function of the SAMPLE key is modified from normal operation. If pressed, the
SAMPLE
key will initiate a calibration operation and permanently alter the Multimeter’s calibration state. To avoid accidental mis-calibration do not attempt to operate the Multimeter in External Trigger mode from the front panel when in Cal, and only press the SAMPLE key when a calibration operation is intended to be performed.
Calibration Menu
This menu allows calibration operations at the calibration point nominal values via Auto, or selection of calibration operations at non-nominal values via
Set
. It also offers access to the special calibration menu. The
CAL legend appears in the left-hand display when in
CAL m ode. adj134f.eps
3-4
CALIBRATION Menu
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Calibration and Verification
Calibration Menus
3
This menu defines four
menu
keys:
Auto
Indicates to the user that the calibration point is automatically set according to the amplitude (and frequency in ACV) of the signal detected. Auto is the default selection on entry to the
CALIBRATION
menu. Refer to the tables appearing later in this chapter for the calibration points for the selected range.
An indication of the use of the
SAMPLE
key is also displayed
Set
The Set feature is available in all functions, allowing the user to enter the true value of the calibration standard where it differs from nominal calibration point value. Pressing Set displays the
SET VALUE
menu except in ACV Spot
Frequency mode, when the
SPOT CAL menu is displayed. Spot Frequency calibration reduces flatness errors within ± 10 % of the spot frequency. Set is not available for DCV, DCI, and Resistance range zero calibrations.
Special
Special Cal
is indicated on the main display. The
SPCL
menu is displayed which allows pre-calibration of the Multimeter, calibration of the frequency
Quit counter, and entry to other calibration utilities.
Exits from the
CALIBRATION menu via the
CALIBRATION DUE ?
menu, where the recommended next calibration date can be entered, before finally quitting the calibration mode.
SET VALUE Menu
This menu is obtained by pressing the Set key in the
CALIBRATION
menu on all functions except ACV Spot Frequency. adj139f.eps
SET VALUE Menu
When this menu appears, it shows the nominal calibration point value, allowing the user to enter the true output value of the calibration standard at the point to be calibrated. The keyboard is activated, locking out all other keys. The Set value is entered in exponential format expressed in Volts, Amps, or Ohms, and must be above 20 % of range (40 % on the 1000V DCV and ACV ranges). The
SAMPLE
key has no effect until the
Set
value is stored by pressing the
Enter
key.
The Multimeter always chooses the most-recently stored
Set
value when calibrating.
Set is not available for DCV, DCI, and Resistance range zero calibrations.
W
Caution
Enter: The new value is stored and the keyboard is deactivated. The set value remains on the dot-matrix display for comparison with the reading on the main display after the
SAMPLE key has been pressed.
Quit: Reverts to the CALIBRATION menu, deleting the set value from store.
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SPOT CAL Menu
This menu is obtained by pressing the
Set
key in the
CALIBRATION
menu when the
Multimeter is in
ACV Spot Frequency
mode. It provides a means of calibrating the
Multimeter at any of six user-specific spot frequencies, at non-nominal calibration values for each
ACV
range. The Multimeter will already be set to an ACV range on entry to the menu.
3-6 adj140f.eps
SPOT CAL Menu
This menu allows a user to select a spot frequency (
Spx
) for the selected range. It defines six
menu
keys:
Sp1
:
Displays menu, where users define the RMS value for the Spot Frequency 1 calibration point on the currently selected range.
Sp2-6
: Same
but permitting their own RMS values to be defined.
SPOT (1 to 6) RMS Menus
On entry to one of the six
SPOT
(
x = 1 to 6
)
RMS
menus, the nominal cardinal point value is displayed and the keyboard is activated. A numeric value can be entered that represents the RMS value of the calibration source signal. adj141f.eps
SPOT n RMS Menus
Enter
Stores the displayed RMS value and de-activates the keyboard.
The dot-matrix display moves to the
SPOT FREQUENCY (1 to 6) showing the calibration signal frequency.
menu,
Quit
Reverts to the
SPOT CAL menu, not storing any new Spot value.
Note
The
SAMPLE
key is still enabled in the next menu.
SPOT FREQUENCY (1 to 6) Menu
Enter this menu by pressing
Enter
in the
SPOT (1 to 6) RMS
menu, which also stores the
RMS value keyed in during this menu. The value in the
SPOT FREQUENCY (1 to 6) menu is the measured frequency of the present calibration input signal. adj142f.eps
SPOT FREQUENCY n Menu
Pressing the
SAMPLE
key causes the selected
ACV range to be spot-calibrated at the calibration signal frequency. The frequency value is stored and can be viewed from the
UTILITY
menu. Any subsequent measurement on this range whose frequency is within http://www.elso.sk
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Calibration and Verification
Calibration Menus
3
±10 % of the stored frequency is accuracy enhanced by reducing frequency response flatness errors.
Calibrate the spot at a new frequency:
To calibrate the spot at a new frequency, change the input signal to the desired new frequency and press
SAMPLE
as before.
Quit
Reverts to the
SPOT CAL menu with the original Spot calibration intact.
Special Calibration
The
SPCL menu provides alignment of the main ADC and calibration of the frequency counter.
It also allows the High Voltage Linearity Pre-Calibration to be performed and a section of the Non-Volatile memory to be cleared for test purposes. These facilities are used in the factory for initial pre-calibration processes; they should not require access during the life of the Multimeter unless repairs have been carried out. They appear here for completeness.
SPCL Menu
The
SPCL
menu appears after pressing the
Spcl
key in the
CALIBRATION menu. At the same time the Multimeter is placed in special calibration mode, and the Special
CAL legend appears on the main display.
When in Special
CAL mode the following front panel keys remain inoperative:
CLEAR
,
TEST
,
OFFSET
,
PRT
and
INPUT
. Also, the function of the
SAMPLE
key changes to become the trigger key for initiating the Hvlin calibration operation. adj137f.eps
SPCL Menu
The
SPCL
menu provides the selection:
Ser#
Adc
Freq
Permits entry of the Multimeter’s serial number.
Aligns the different resolutions available from the Multimeter's main analogto-digital converter, so that there are no significant differences in readings when changing resolutions with a constant input value. No external input signals are required for this calibration. Calibration is initiated directly by making this selection from the SPCL menu.
Calibrates the frequency counter against an external source. Calibration is initiated directly by making this selection from the SPCL menu.
Hvlin
Selects the sequence required to correct the linearity of the 1kV DC range.
ClrNv
Provides the capability to clear a section of the non-volatile memory for ‘test purposes only’.
Quit
Reverts to the
CALIBRATION menu.
SER # = Menu
This menu is obtained by pressing
Ser#
in the
SPCL
menu. On entry to the menu, the most-recently-entered serial number is shown, and the keyboard is activated. A numeric value can be entered. http://www.elso.sk
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adj138f.eps
SER# Menu
The
SER#
menu provides the selection:
Enter
Stores the new serial number, de-activates the keyboard, and reverts to the
SPCL
menu.
Quit
Reverts to the
SPCL
menu, leaving the old serial number intact.
Hvlin Menu
This menu sequence is obtained by selecting
Hvlin
from the
SPCL
menu. It allows the linearity of the 1kV DC range to be calibrated with the application of five input signals of
-1000V, -500V, 0V, +500V and +1000V in turn, with the 1kV DC range selected. On entry to the menu, the user is prompted to apply the first input signal required and step through the sequence:
3-8 adj135f.eps
Hvlin Menus
Pressing the
SAMPLE
key initiates the calibration operation at the signal level displayed for the step in progress and; also, saves the result for calculation of the
Hvlin
linearity correction factor at the end of the sequence.
PREV
NEXT
CALC
Moves back to the previous menu allowing the user to repeat the previous step in the sequence if required.
Moves forward through the sequence to the next step and signal level.
Initiates calculation and storage of the high voltage linearity correction factor, completing the
Hvlin
calibration process.
Non-volatile input offset compensation
Good metrology practice should ensure that all high-precision measurements made with the Multimeter are preceded by an input zero of each measurement. However, a nonvolatile input-offset compensation is independently available for the front and rear inputs and will be used whenever the input zero capability is not in use. The compensation is retained after power down, is unaffected by clearing the volatile input zeros, and is unaffected by range zero calibration adjustments. Compensation is available on all functions, and includes separate compensation of 2-wire and 4-wire measurements in the resistance functions. http://www.elso.sk
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Calibration and Verification
Routine Calibration
3
Non-volatile input-offset compensation adjustment is available only when the rear panel calibration keyswitch is in the
ENABLE
position and the
CAL legend is not shown on the main display.
Adjustment is performed by initiating an input zero operation with the Multimeter in this condition, using the
INPUT
menu as described in Chapter 3 or using the IEEE 488 input zeroing commands described in Chapter 4. Appy a high-integrity low-thermal emf 4-wire short to the input terminals for this operation. Following adjustment for a particular combination of function, range, and input a compensation is also stored for the corresponding volatile input zero, and the Zero legend is shown on the main display. The
Zero legend may be removed from the display without affecting the stored non-volatile compensation by using one of the following operations:
1.
Power the Multimeter down.
2.
Press the
CLEAR
key and make any of the selections from the
CLEAR
menu.
3.
Press the
CAL key and entering
CAL mode.
4.
Use the corresponding IEEE 488 commands.
Routine Calibration
The 8508A Digital Reference Multimeter offers state-of-the-art performance. This procedure is intended as a guide for qualified metrology personnel who have access to a standards laboratory with equipment available to support an Multimeter of this level of accuracy. It reflects the calibration process used by Fluke to perform Multimeter calibration implemented in an automated system, but as a manual procedure for users to follow. The procedure is based on the following assumptions:
1.
Users are familiar with relevant best measurement practice.
2.
Users will take precautions to avoid introducing errors from sources such as thermal emfs, leakages, electromagnetic interference, etc.
3.
Users will make adequate allowance for equipment stabilization and measurement settling times.
This routine calibration procedure describes the calibration points and sequence of operations required to calibrate the Multimeter and assumes calibration references of adequate traceable uncertainty are available – in this case a Fluke 5720A calibrator and
5725A amplifier used with an 8508A-7000 Calibration Kit. The procedure assumes the user is able to calibrate and characterize the calibration standards, without describing the process required to do so.
Characterization of the 5720A/5725A combination allows the 8508A to be calibrated with uncertainties lower than otherwise available from that equipment. The characterization process determines the 5720A/5725A errors from nominal at the values required for 8508A calibration, and may be performed using Fluke’s recommended verification procedures appearing in the 5700A/5720A Service Manual as a guide. If a characterized 5720A/5725A combination is available where the error from nominal at the various points required is known, those errors may be taken into account during calibration to reduce the uncertainties. The errors may be determined by measurement against suitable standards or may be taken from an applicable certificate of calibration.
The uncertainty of the characterized calibrator should be combined with the Multimeter
Relative to Standards specifications to determine Multimeter performance after calibration. (RSS summation is recommended).
If the calibrator is not characterized to determine its errors from nominal, its output should be assumed to be nominal at all points. Its performance specifications should be http://www.elso.sk
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3-10 used to provide calibration uncertainties to be combined with the 8508A Relative to
Standards specifications to determine the achieved Multimeter performance after calibration. (RSS summation is recommended).
See Chapter 5 for more details of combining 8508A Relative to Standards specifications and calibration uncertainties.
Note
The Multimeter should be thoroughly checked to ensure it is operating correctly before attempting calibration. A performance verification procedure appears later in this section.
Equipment Required for Calibration
The equipment required for Calibration and Performance Verification is listed in
Table 3-1.
Table 3-1. Required Equipment for Calibration Adjustments and Performance Verification
Equipment Name
Signal Lead Set
Calibration Kit
Minimum Use
Specifications
(ranges and accuracy)
Multifunction Calibrator
[1] [2]
Amplifier
[2]
One 1 G
Ω
Standard, two precision low thermal emf
4-wire shorting devices, and connecting leads.
Recommended Models
Fluke 5440-7003, -7004, -7005
Fluke 8508A-7000K
PC/Network Printer/ Cables
Metrology bd software
PC/Network Printer/ Cables Any
Fluke MetBase
Metrology Calibration Software Fluke Metcal v6.11 or later
[1] Availability of a 1 MHz frequency reference signal may be required for 5720A frequency locking during 8508A frequency calibration procedure.
[2] Best uncertainties are obtained by characterizing the outputs of the 5720A and 5725A at the points used for 8508A calibration.
Alternate equipment may be used, but users should ensure it provides adequate calibration uncertainties. Performance of the Multimeter after calibration should be determined by combining the applicable calibration uncertainties provided by the calibration equipment with the 8508A Relative to Standards specifications. (RSS summation is recommended).
Preparing for Calibration
The following procedures represent the recommended order of calibration, giving all the necessary setup commands.
1.
Allow the Multimeter to warm-up under power in the specified environment for at least 4 hours.
2.
Press the
CLEAR
key, select
Pwr Up Dflt
to restore the power up default configuration and display the
DCV
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Calibration and Verification
Routine Calibration
3
3.
Set the rear panel Calibration switch to
Enable
. Removal of any calibration sticker or integrity seal covering the calibration switch will be necessary.
4.
Press the
CAL key.
5.
The
CALIBRATION
menu is displayed.
The calibration menu appears, and the
CAL legend appears on the main display. When entering
CAL mode and selecting a function the optimum resolution for performing calibration in that function is automatically selected. Refer to Table 3-2 for the full multimeter calibration sequence.
Note
It is recommended that the default resolutions are used for calibration purposes. Other resolutions may be selected and calibration operations performed, but accuracy of calibration will be degraded if calibration is performed in lower resolutions.
W
Caution
When in
CAL mode with the
CAL legend appearing on the main display, the function of the SAMPLE key is modified from normal operation. If pressed, the SAMPLE key will initiate a calibration operation and permanently alter the Multimeter’s calibration state. To avoid accidental mis-calibration do not attempt to operate the Multimeter in External Trigger mode from the front panel when in Cal, and only press the SAMPLE key when a calibration operation is intended to be performed.
Table 3-2. Calibration Sequence
General Sequence for Full Multimeter Calibration
[1]
Enable Calibration
Enter Cal mode
Adc Cal
DCV
ACV
Ohms
DCI
ACI
Frequency
Exit Cal mode
NV input offsets
Set CAL DUE
Disable Calibration
Set rear panel calibration switch to ENABLE.
Access CALIBRATION menu .
Analog to digital converter alignment. Performed only if required.
Range Zeros and Range Gains (200 mV to 1 kV Ranges).
Range Zeros, Range LF Gains and Range HF Gains (200 mV to 1 kV
Ranges).
Range Zeros and Range Gains:
Ohms: 2
Ω
to 2 G
Ω
Ranges, then LoI Ohms.
Tru
Ω
: 2 to 20 k
Ω
Ranges, then LoI Tru
HiV
Ω
: 20 M
Ω
to 20 G
Ω
Ranges.
Ω
.
Range Zeros and Range Gains (200 μA to 20 A Ranges).
Range Zeros and Range Gains (200 μA to 20 A Ranges).
Frequency counter cal at 1 MHz
Quit the CALIBRATION menu.
Front & rear non-volatile input offset adjustments:
DCV, Ohms, Tru
Ω
, HiV
Ω
(including LoI , 2 & 4-wire).
Set the date for the next external calibration
Set rear panel calibration switch to DISABLE.
[1] To meet user's need, just one range on one function can be calibrated.
Interconnections
The Fluke 8508A-7000K Calibration kit contains a specially designed lead set which connects directly to the terminals of the Multimeter, the 5720A, and the 5725A for the purpose of Multimeter calibration. It is recommended that this lead kit be used to avoid introducing measurement errors due to interconnections and to duplicate the http://www.elso.sk
3-11
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riešenia na presné meranie configuration used by Fluke for Multimeter calibration. Figure 3-1 shows the interconnections used in detail. If alternate leads are substituted, make sure they are metrology grade leads, and of adequate voltage and current ratings. Leads should be kept as short as possible, constructed from low capacitance low leakage dielectric material
(PTFE) with low thermal emf terminations, and exactly duplicate the configuration and interconnections shown.
When calibrating the 2 G
Ω
and 20 G
Ω
resistance ranges the 1 G
Ω
standard resistor supplied in the Fluke 8508A-7000K Calibration kit plugs directly into the Multimeter’s front input terminals, without any interconnecting leads. If alternate resistance standards are used for resistance calibration, refer to the resistance-measurements section of
Chapter 3
Making Measurements
for connection details.
The Fluke 8508A-7000K Calibration kit also contains two precision low-thermal emf
4-wire shorting devices for use when performing the non-volatile input offset adjustments at the front and rear input terminals. These devices link the input terminals in the following order: Input Lo to Input Hi to Sense Hi to Sense Lo. If these devices are not available it is recommended that a U-shaped piece of thick bare copper wire be used to link the terminals in the same manner.
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Red
Green
White riešenia na presné meranie
Red
Black
Blue
Red
Green
White
Link guard and ground terminal
White
HI
CURRENT
OUTPUT
LO
Green
Red
Black
Blue
8508A REFERENCE MULTIMETER
8508A-7000K
Calibration and Verification
Routine Calibration
HI
CURRENT
OUTPUT
LO
Link guard and ground terminal
3
Figure 3-1. Equipment Connections Required for Calibration
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ADC Calibration
ADC (analog to digital converter) calibration aligns the different resolutions available from the Multimeter’s analog to digital converter, so that there are no significant differences in readings when changing resolutions with a constant input value. It is recommended that
ADC CAL is only performed if performance verification indicates significant resolution differences. If required, it is recommended that ADC calibration is performed before any other calibrations.
No external equipment or signals are required to perform ADC calibration.
Procedure
1.
Ensure that no signals are present on the Multimeter’s inputs. The Multimeter may be left connected to the calibrator as shown above provided the calibrator output is set to
STANDBY.
2.
On the Multimeter, Press
CAL to enter the
CALIBRATION
menu, and select
SPCL
.
3.
Select
Adc to initiate the calibration operation, which will take approximately 3 minutes to complete.
Calibration is complete when the
Busy
legend goes out.
DC Voltage Calibration
XW
Warning
The Calibrator can deliver a lethal electric shock.
To avoid electric shock when performing the following calibration procedures:
•
Never touch any lead or terminal unless you are absolutely certain that no dangerous voltage is present.
•
Make sure that signal leads are in a safe condition before you handle them in any way.
Initial Setup
1.
Press the
DCV
key, select the
200 mV
range.
2.
Press the
CONFIG
key. Select
Filt.
3.
In calibration mode the resolution defaults to
RESL7
in the DCV function. It is recommended that this resolution is used for calibration of all DCV ranges.
4.
Reselect
DCV
.
5.
Confirm that the Multimeter is configured for internal guard (External Guard is deselected) by checking that the
Ext Grd
legend does not appear on the left-hand display.
6.
Ensure that the calibrator output is set to
STANDBY
and configured for Internal
Guard (
EXT GRD
is deselected).
7.
Connect the Calibrator to the Multimeter as shown above.
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Routine Calibration
3
Range Zero and Gain Calibration Procedure
After the initial setup and connecting up, use the following procedure to calibrate range zero, then positive and negative range gains on all DCV ranges. Just one range can be calibrated if required, but for a full calibration start with the 200 mV range and work up to the 1kV range, as shown in Table 3-3.
2 V
Table 3-3. DC Voltage Calibration Points and Sequence
8508A Range
200 mV
20 V
200 V
1000 V
Zero
Point
Range Gain +ve
Range Gain -ve
Zero
Range Gain +ve
Range Gain -ve
Zero
Range Gain +ve
Range Gain -ve
Zero
Range Gain +ve
Range Gain -ve
Zero
Range Gain +ve
Range Gain -ve
Voltage
0 mV
+100 mV
-100 mV
0 V
+1 V
-1 V
0 V
+10 V
-10 V
0 V
+100 V
-100 V
0 V
+1000 V
-1000 V
The procedure assumes the user has knowledge of the actual output value of the calibrator at the range gain values, from a measurement or from a certificate of calibration. The
Set
feature allows a user to enter the true output value of the calibration standard where it differs from the nominal range gain point. If the calibrator output is considered to be exactly nominal, use of the Set feature is not required, also
omit
steps 2-
4 for the Range Gain Points.
On each range, the Multimeter automatically recognizes the appropriate value as range zero or range gain from the applied signal amplitude and polarity.
Zero Point
1.
On the Multimeter, select the required range.
2.
On the Calibrator, set zero output and Operate.
3.
On the Multimeter, press
CAL to enter the
CALIBRATION
menu.
4.
Press
SAMPLE to initiate the calibration operation.
Calibration is complete when the Busy legend goes out and the calibrated measurement is displayed. http://www.elso.sk
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3-16
Range Gain Points
1.
On the Calibrator, select the positive Range Gain point Output value.
2.
On the Multimeter, Press
CAL to revert to
CALIBRATION
menu.
3.
Select
Set
on the
CALIBRATION menu
.
4.
Use the numeric keys with the
SET VALUE
menu to key in the true output value of the calibrator at the range gain value, then press Enter.
5.
Press
SAMPLE to initiate the calibration operation.
Calibration is complete when the Busy legend goes out and the calibrated measurement is displayed.
6.
On the Calibrator, select the negative Range Gain point Output value.
7.
Repeat steps 3 to 5 above to calibrate the negative Range gain point.
8.
On the Calibrator, set Standby.
9.
Press the
DCV
key to revert to the ranges menu.
AC Voltage Calibration
XW
Warning
The Calibrator can deliver a lethal electric shock.
To avoid electric shock when performing the following calibration procedures:
•
Never touch any lead or terminal unless you are absolutely certain that no dangerous voltage is present.
•
Make sure that signal leads are in a safe condition before you handle them in any way
Initial Setup and Connections
1.
Press the
ACV
key, select the
200 mV
range..
2.
Press the
CONFIG
key.
In calibration mode in the ACV function Transfer mode defaults to On for enhanced performance, resolution defaults to
RESL6
, and the
100Hz RMS filter is automatically selected. It is recommended that this resolution,
Transfer On and 100Hz Filter is used for calibration of all ACV ranges.
3.
Reselect
ACV
.
4.
Confirm that the Multimeter is configured for internal guard (External Guard is deselected) by checking that the
Ext Grd
legend does not appear on the left-hand display.
5.
Ensure that the calibrator output is set to
STANDBY
and configured for Internal
Guard (
EXT GRD
is deselected).
6.
Connect the Calibrator to the Multimeter as shown above.
Range Zero, LF, and HF Gain Calibration Procedure (not in Spot Frequency mode)
Using the following procedure to calibrate range zero then range LF and HF gains on all
ACV ranges at the voltages and frequencies detailed in Table 3-4. Just one range can be calibrated if required, but for a full-calibration start with the 200 mV range and work up to the 1kV range. http://www.elso.sk
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Calibration and Verification
Routine Calibration
3
Table 3-4. AC Voltage Calibration Points and Sequence
8508A Range
200 mV
2 V
20 V
Point
Zero (5 % Range)
Range Gain LF
Range Gain HF
Zero (0.5 % Range)
Range Gain LF
Range Gain HF
Zero (0.5 % Range)
Range Gain LF
Range Gain HF
Voltage
10 mV
100 mV
100 mV
10 mV
1V
1V
100 mV
10 V
10 V
Frequency
1 kHz
1 kHz
60 kHz
1 kHz
1 kHz
60 kHz
1 kHz
1 kHz
60 kHz
200 V Zero (0.5 % Range)
Range Gain LF
Range Gain HF
1 V
100 V
100 V
1 kHz
1 kHz
60 kHz
1000 V
[1]
Zero (0.5 % Range)
Range Gain LF
5 V
500 V
1 kHz
1 kHz
Range Gain HF 500 V 30 kHz
[1] 1000V range Gain calibrations may be performed at voltages above 500V. The 1000V range Gain and Zero calibrations should be performed together, with the Zero cal performed at 1 % of the nominal value used for Gain cal.
The procedure assumes the user has knowledge of the actual output value of the calibrator at each point, from a measurement or from a certificate of calibration. The
Set feature allows a user to enter the true output value of the calibration standard where it differs from the nominal point. If the calibrator output is considered to be exactly nominal, use of the
Set
feature is not required, also
omit
steps 3-5.
On each range, the Multimeter automatically recognizes the appropriate value as range zero from the applied signal amplitude, and automatically recognizes the range LF and
HF gain points from the applied signal frequency.
1.
On the Multimeter, select the required Range.
2.
On the Calibrator select Output Voltage and Frequency, Operate
3.
On the Multimeter, Press
CAL to revert to
CALIBRATION
menu.
4.
Select
Set
on the
CALIBRATION menu
.
5.
Use the numeric keys with the
SET VALUE
menu to key in the true output value of the calibrator, then press Enter.
6.
Press
SAMPLE to initiate the calibration operation.
Calibration is complete when the
Busy
legend goes out and the calibrated measurement is displayed Note that HF gain calibrations are iterative, and repeating the HF calibration may improve the result.
7.
On the Calibrator, set Output to
STANDBY
.
8.
On the Multimeter, press
ACV
key to revert to the ranges menu. http://www.elso.sk
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8508A
Service Manual
Resistance Calibration
When calibrating the resistance function, each of the resistance modes (Normal, LoI,
Tru
Ω
, Tru
Ω
LoI and HiV
Ω
) must be individually calibrated. The following procedure assumes use of a multifunction calibrator and calibrates each resistance mode in turn, range by range. If individual standard resistors are used it may be more convenient to calibrate all the modes in turn for each resistance value to avoid connecting the same resistance standard several times during the calibration sequence. A 1 G
Ω
standard resistor provided in the 8508A-7000K calibration kit is used for ranges above 200 M
Ω
as the highest resistance available from the 5720A calibrator is 100 M
Ω
. Refer to Table 3-5 for the resistance calibration points and sequence.
Table 3-5. Resistance Calibration Points and Sequence
8508A Range Modes Point Resistance
2
Ω
Normal, Normal LoI,
Tru
Ω
, Tru
Ω
LoI
Zero
Range Gain
0
Ω
1
Ω
20
Ω
200
Ω
Normal, Normal LoI,
Tru
Ω
, Tru
Ω
LoI
Normal, Normal LoI,
Tru
Ω
, Tru
Ω
LoI
Range Gain
Zero
Range Gain
10
Ω
0
Ω
100
Ω
2 k
Ω
20 k
Ω
Normal, Normal LoI,
Tru
Ω
, Tru
Ω
LoI
Normal, Normal LoI,
Tru
Ω
, Tru
Ω
LoI
Range Gain
Zero
Range Gain
1 k
Ω
0
Ω
10 k
Ω
200 k
Ω
Normal, Normal LoI
2 M
Ω
20 M
Ω
Normal, Normal LoI
Normal, Normal LoI,
HiV
Ω
Range Gain
Zero
Range Gain
Zero
Range Gain
100 k
Ω
0
Ω
1 M
Ω
0
Ω
10 M
Ω
200 M
Ω
Normal, Normal LoI,
HiV
Ω
2 G
Ω
Normal, Normal LoI,
HiV
Ω
Range Gain
Zero
Range Gain
100 M
Ω
0
Ω
1 G
Ω
20 G
Ω
HiV
Ω
Optional
[1]
Range Gain
[1] 20 G
Ω
range gain is calibrated automatically during 2 G
Ω
HiV
Ω
range gain cal, but may be calibrated separately
(after 2 G
Ω
HiV
Ω
range cal) at 10 G
Ω
if a standard is available. The 100 M
Ω
and 2 G
Ω
Normal
Ω
ranges must be calibrated before 2 G
Ω
HiV
Ω
range gain point.
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Calibration and Verification
Routine Calibration
3
Initial Setup and Connections
1.
Press the
Ω
key and select the
200
Ω
range.
2.
Press the
CONFIG
key and select
Filt
and
4w
Ω
.
3.
In calibration mode the resolution defaults to
RESL7
in the resistance function. It is recommended that this resolution is used for calibration of all resistance ranges.
4.
Reselect
Ω
.
5.
Confirm that the Multimeter is configured for internal guard (External Guard is deselected) by checking that the
Ext Grd
legend does not appear on the left-hand display.
6.
Ensure that the calibrator output is set to
STANDBY
and configured for Internal
Guard (
EXT GRD
is deselected). On the calibrator select
EX SNS
(4-wire).
7.
Connect the Calibrator to the Multimeter as shown earlier in this chapter.
8.
If using standard resistors in place of the calibrator refer to "Measuring Resistance" in Chapter 3 of the Users Manual for information regarding 4-wire resistance connections.
Normal
Ω
Mode Calibration
1.
Press the
Ω
key and select the
2
Ω
range.
2.
Press the
CONFIG
key and select
Filt
and
4w
Ω
. Ensure LoI is deselected.
Range Zero and Gain Calibration Procedure
After the initial setup and connecting up, use the following procedure to calibrate range zero and range gain for the ranges and points detailed in Table 3-5 for the Normal
Ω mode. For the 2 G
Ω range use the 1 G
Ω
standard resistor in place of the calibrator. Just one range can be calibrated if required, but for a full-calibration start with the 2
Ω
range and work up to the 2 G
Ω
range.
Note that EX SNS (4-wire) is not available on the 5720A 100 M
Ω
range, and the 8508-
7000K 1 G
Ω
standard resistor is used as a 2-wire device with the calibrator 2-wire resistance zero used for the corresponding zero points.
4W
Ω is deselected on the
Multimeter when calibrating the 200 M
Ω
and 2 G
Ω
range, range zero, and range gain points.
On each range, the Multimeter automatically recognizes the appropriate value as range zero or range gain from the applied resistance value.
Note
It is unlikely that the resistance standard will be at exactly the nominal value required.
The
Set
feature allows a user to enter the true output value of the calibration standard where it differs from nominal range gain point.
If the resistance value is exactly the nominal value required, omit steps 2-4 for the Range Gain Point.
Zero Point
1.
On the Multimeter, select the required range.
2.
On the Calibrator, select zero and Operate. Alternatively if using a standard resistor connect the standard resistor for a 4-wire resistance zero. (For the 200 M
Ω
and 2 G
Ω ranges, de-select EX SNS on the calibrator and de-select
4W
Ω
ο n the Multimeter.)
3.
On the Multimeter, press
CAL to enter the
CALIBRATION
menu.
4.
Press
SAMPLE to initiate the calibration operation. http://www.elso.sk
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8508A
Service Manual
Calibration is complete when the Busy legend goes out and the calibrated measurement is displayed
Range Gain Point
1.
On the Calibrator, select the Range Gain point resistance value. Alternatively if using a standard resistor re-connect the standard resistor to measure its resistance. (For the
2 G
Ω range the 8508-7000K 1 G
Ω
standard resistor is used in place of the calibrator.
For the 200 M
Ω
and 2 G
Ω
ranges, de-select EX SNS on the calibrator and de-select
4W
Ω
ο n the Multimeter.)
2.
On the Multimeter, Press
CAL to revert to
CALIBRATION
menu.
3.
Select
Set
on the
CALIBRATION menu
.
4.
Use the numeric keys with the
SET VALUE
menu to key in the true output value of the calibrator (or the value of the resistance standard) at the range gain value, then press Enter.
5.
Press
SAMPLE
to initiate the calibration operation.
Calibration is complete when the Busy legend goes out and the calibrated measurement is displayed.
6.
On the Calibrator, set
STANDBY
.
7.
Press the Ω key to revert to the ranges menu.
LoI
Ω
Mode Calibration
1.
Press the
Ω
key and select the 2
Ω
range.
2.
Press the
CONFIG
key and select
Filt
,
LoI
and
4w
Ω
.
Range Zero and Gain Calibration Procedure
After the initial setup and connecting up, use the following procedure to calibrate range zero and range gain for the ranges and points detailed in Table 3-5 for the LoI mode. For the 2 G
Ω range use the 1 G
Ω
standard resistor in place of the calibrator. Just one range can be calibrated, if required, but for a full-calibration start with the 2
Ω
range and work up to the 2 G
Ω
range.
Note that EX SNS (4-wire) is not available on the 5720A 100 M
Ω
range, and the 8508-
7000K 1 G
Ω
standard resistor is used as a 2-wire device with the calibrator 2-wire resistance zero used for the corresponding zero points.
4W
Ω is deselected on the
Multimeter when calibrating the 200 M
Ω
and 2 G
Ω
range, range zero, and range gain points.
On each range, the Multimeter automatically recognizes the appropriate value as range zero or range gain from the applied resistance value.
Note
It is unlikely that the resistance standard will be at exactly the nominal value required.
The
Set
feature allows a user to enter the true output value of the calibration standard where it differs from nominal range gain point.
If the resistance value is exactly the nominal value required, omit steps 2-4 for the Range Gain Point.
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Calibration and Verification
Routine Calibration
3
Zero Point
1.
On the Multimeter, select the required range.
2.
On the Calibrator, select zero
Ω
and Operate. Alternatively if using a standard resistor connect the standard resistor for a 4-wire resistance zero. (For the 200 M
Ω and 2 G
Ω
ranges, de-select Ex SNS on the calibrator and de-select
4W
Ω
ο n the
Multimeter.)
3.
On the Multimeter, press
CAL to enter the
CALIBRATION
menu.
4.
Press
SAMPLE
to initiate the calibration operation.
Calibration is complete when the Busy legend goes out and the calibrated measurement is displayed.
Range Gain Point
1.
On the Calibrator, select the Range Gain point resistance value. Alternatively if using a standard resistor re-connect the standard resistor to measure its resistance. (For the
2 G
Ω range the 8508-7000K 1 G
Ω
standard resistor is used in place of the calibrator.
For the 200 M
Ω
and 2 G
Ω
ranges, de-select Ex SNS on the calibrator and de-select
4W
Ω
ο n the Multimeter.)
2.
On the Multimeter, Press
CAL to revert to
CALIBRATION
menu.
3.
Select
Set
on the
CALIBRATION menu
.
4.
Use the numeric keys with the
SET VALUE
menu to key in the true output value of the calibrator (or the value of the resistance standard) at the range gain value, then press Enter.
5.
Press
SAMPLE
.
Calibration is complete when the Busy legend goes out and the calibrated measurement is displayed.
6.
On the Calibrator, set
STANDBY
.
7.
Press the Ω key to revert to the ranges menu.
Tru
Ω
Mode Calibration
1.
Press the Ω
Plus
key and select
Tru
Ω
.
From the
Tru
Ω menu select the
2
Ω range.
2.
Press the
CONFIG
key and select
Filt
and
4w
Ω . Ensure
LoI
is deselected.
Range Zero and Gain Calibration Procedure
After the initial setup and connecting up, use the following procedure to calibrate range zero and range gain for the ranges and points detailed in Table 3-5 for the Tru
Ω
mode.
Just one range can be calibrated, if required, but for a full-calibration start with the 2
Ω range and work up to the 20 k
Ω
range.
On each range, the Multimeter automatically recognizes the appropriate value as range zero or range gain from the applied resistance value.
Note
It is unlikely that the resistance standard will be at exactly the nominal value required. The
Set
feature allows a user to enter the true output value of the calibration standard where it differs from nominal range gain point.
If the resistance value is exactly the nominal value required, omit steps 2-4 for the Range Gain Point.
http://www.elso.sk
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8508A
Service Manual
Zero Point
1.
On the Multimeter, select the required range.
2.
On the Calibrator, select zero
Ω
and Operate. Alternatively if using a standard resistor connect the standard resistor for a 4-wire resistance zero.
3.
On the Multimeter, press
CAL to enter the
CALIBRATION
menu.
4.
Press
SAMPLE to initiate the calibration operation.
Calibration is complete when the Busy legend goes out and the calibrated measurement is displayed.
Range Gain Point
1.
On the Calibrator, select Range Gain point Output value. Alternatively if using a standard resistor re-connect the standard resistor to measure its resistance.
2.
On the Multimeter, Press
CAL to revert to
CALIBRATION
menu.
3.
Select
Set
on the
CALIBRATION menu
.
4.
Use the numeric keys with the
SET VALUE
menu to key in the true output value of the calibrator (or the value of the resistance standard) at the range gain value, then press Enter.
5.
Press
SAMPLE
to initiate the calibration operation.
Calibration is complete when the Busy legend goes out and the calibrated measurement is displayed.
6.
On the Calibrator, set
STANDBY
.
7.
Press the Ω key to revert to the ranges menu.
Tru
Ω
LoI Mode Calibration
1.
Press the Ω
Plus
key and select
Tru
Ω
.
From the
Tru
Ω menu select the
2
Ω range.
2.
Press the
CONFIG
key and select
Filt
,
LoI
and
4w
Ω .
Range Zero and Gain Calibration Procedure
After the initial setup and connecting up, use the following procedure to calibrate range zero and range gain for the ranges and points detailed in Table 3-5 for the Tru
Ω
LoI mode. Just one range can be calibrated if required, but for a full calibration start with the
2
Ω
range and work up to the 20 k
Ω
range.
On each range, the Multimeter automatically recognizes the appropriate value as range zero or range gain from the applied resistance value.
Note
It is unlikely that the resistance standard will be at exactly the nominal value required.
The
Set
feature allows a user to enter the true output value of the calibration standard where it differs from nominal range gain point.
If the resistance value is exactly the nominal value required, omit steps 2-4 for the Range Gain Point.
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Calibration and Verification
Routine Calibration
3
Zero Point
1.
On the Multimeter, select the required range.
2.
On the Calibrator, select zero
Ω
and Operate. Alternatively if using a standard resistor connect the standard resistor for a 4-wire resistance zero.
3.
On the Multimeter, press
CAL to enter the
CALIBRATION
menu.
4.
Press
SAMPLE to initiate the calibration operation.
Calibration is complete when the Busy legend goes out and the calibrated measurement is displayed.
Range Gain Point
1.
On the Calibrator, select Range Gain point Output value. Alternatively if using a standard resistor re-connect the standard resistor to measure its resistance.
2.
On the Multimeter, Press
CAL to revert to
CALIBRATION
menu.
3.
Select
Set
on the
CALIBRATION menu
.
4.
Use the numeric keys with the
SET VALUE
menu to key in the true output value of the calibrator (or the value of the resistance standard) at the range gain value, then press Enter.
5.
Press
SAMPLE to initiate the calibration operation.
Calibration is complete when the Busy legend goes out and the calibrated measurement is displayed.
6.
On the Calibrator, set
STANDBY
.
7.
Press the Ω key to revert to the ranges menu.
HiV
Ω
Mode Calibration
XW
Warning
The Multimeter can deliver a lethal electric shock when operating in the High Voltage Resistance mode. Voltages up to
240V may appear on the terminals.
To avoid electric shock when performing the following calibration procedures:
•
Never touch any lead or terminal unless you are absolutely certain that no dangerous voltage is present.
•
Make sure that signal leads are in a safe condition before you handle them in any way.
1.
Press the
Ω
Plus
key and select
HiV
Ω
.
From the
HiV
Ω
menu select the
20 M
Ω
range.
2.
Press the
CONFIG
key and select
Filt
and
4w
Ω
.
Range Zero and Gain Calibration Procedure
After the initial setup and connecting up, use the following procedure to calibrate range zero and range gain for the ranges and points detailed in Table 3-5 for the HiV
Ω
mode.
Just one range can be calibrated if required, but for a full calibration start with the 20 M
Ω range and work up to the 20 G
Ω
range. http://www.elso.sk
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8508A
Service Manual
For the 2 G
Ω range use the 1 G
Ω
standard resistor in place of the calibrator. To avoid the requirement for a 10 G
Ω
standard, the 20 G
Ω
range is automatically calibrated when the
2 G
Ω range gain calibration is triggered. It is also necessary for the 100 M
Ω
and 1 G
Ω
Normal
Ω
ranges to be calibrated prior to the 2 G
Ω
HiV
Ω range for the result to be valid.
A 10 G
Ω
standard resistor may be used for calibrating the 20 G
Ω
range if available, but if performed, this operation must take place after the 2 G
Ω
range gain point calibration to avoid the automatic process overwriting the result.
Voltages of approximately 200V will be developed across the resistance standard at full scale, ensure the resistance standards used are suitable for operation at these voltages.
Note that EX SNS (4-wire) is not available on the 5720A 100 M
Ω
range, and the 8508-
7000K 1 G
Ω
standard resistor is used as a 2-wire device with the calibrator 2-wire resistance zero used for the corresponding zero points.
4W
Ω is deselected on the
Multimeter when calibrating the 200 M
Ω
and 2 G
Ω
range, range zero, and range gain points.
On each range, the Multimeter automatically recognizes the appropriate value as range zero or range gain from the applied resistance value.
Note
It is unlikely that the resistance standard will be at exactly the nominal value required. The
Set
feature allows a user to enter the true output value of the calibration standard where it differs from nominal range gain point.
If the resistance value is exactly the nominal value required, omit steps 2-4 for the Range Gain Point .
Zero Point
1.
On the Multimeter, select the required range.
2.
On the Calibrator, select zero
Ω
and Operate. (For the 200 M
Ω
range and above, deselect Ex SNS on the calibrator and de-select
4W
Ω
ο n the Multimeter.) Alternatively if using a standard resistor connect the standard resistor for a 4-wire resistance zero.
3.
On the Multimeter, press
CAL to enter the
CALIBRATION
menu.
4.
Press
SAMPLE to initiate the calibration operation.
Calibration is complete when the Busy legend goes out and the calibrated measurement is displayed.
Range Gain Point
1.
On the Calibrator, select Range Gain point Output value. Alternatively if using a standard resistor re-connect the standard resistor to measure its resistance. (For the
2 G
Ω range the 8508-7000K 1 G
Ω
standard resistor is used in place of the calibrator.
For the 200 M
Ω
range and above, de-select Ex SNS on the calibrator and de-select
4W
Ω
ο n the Multimeter. Calibration of the 20 G
Ω range gain point takes place automatically when calibrating 2 G
Ω range, and calibration against an external standard is optional if a suitable standard is available).
2.
On the Multimeter, Press
CAL to revert to
CALIBRATION
menu.
3.
Select
Set
on the
CALIBRATION menu
.
4.
Use the numeric keys with the
SET VALUE
menu to key in the true output value of the calibrator (or the value of the resistance standard) at the range gain value, then press Enter.
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Calibration and Verification
Routine Calibration
3
5.
Press
SAMPLE to initiate the calibration operation.
Calibration is complete when the Busy legend goes out and the calibrated measurement is displayed.
6.
On the Calibrator, set
STANDBY
.
7.
Press the Ω key to revert to the ranges menu.
DC Current Calibration
XW
Warning
The Calibrator can deliver a lethal electric shock.
To avoid electric shock when performing the following calibration procedures:
•
Never touch any lead or terminal unless you are absolutely certain that no dangerous voltage is present.
•
Make sure that signal leads are in a safe condition before you handle them in any way.
Initial Setup
1.
Press the
DCI
key, select the
200
μ
A
range.
2.
Press the
CONFIG
key. Select
Filt
.
3.
In calibration mode the resolution defaults to
RESL7
in the DCI function. It is recommended that this resolution is used for calibration of all DCI ranges.
4.
Reselect
DCI
.
5.
Confirm that the Multimeter is configured for internal guard (External Guard is deselected) by checking that the
Ext Grd
legend does not appear on the left-hand display.
6.
Ensure that the calibrator output is set to
STANDBY
and configured for Internal
Guard (
EXT GRD
is deselected).
7.
Connect the Calibrator to the Multimeter as shown above.
Range Zero and Gain Calibration Procedure
After the initial setup and connecting up, use the following procedure to calibrate range zero, then positive and negative range gains on all DCI ranges. Just one range can be calibrated if required, but for a full calibration start with the 200
μ
A range and work up to the 20A range, as shown in Table 3-6. http://www.elso.sk
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8508A
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Table 3-6. DC Current Calibration Points and Sequence
8508A Range
200
μ
A
2 mA
20 mA
200 mA
2 A
20 A
Zero
Point
Range Gain +ve
Range Gain -ve
Zero
Range Gain +ve
Range Gain -ve
Zero
Range Gain +ve
Range Gain -ve
Zero
Range Gain +ve
Range Gain -ve
Zero
Range Gain +ve
Range Gain -ve
Zero
Range Gain +ve
Range Gain -ve
Current
0
μ
A
+100
μ
A
-100
μ
A
0 mA
+1 mA
-1 mA
0 mA
+10 mA
-10 mA
0 mA
+100 mA
-100 mA
0 A
+1 A
-1 A
0 A
+10 A
-10 A
The procedure assumes the user has knowledge of the actual output value of the calibrator at the range gain values, from a measurement or from a certificate of calibration. The
Set
feature allows a user to enter the true output value of the calibration standard where it differs from the nominal range gain point. If the calibrator output is considered to be exactly nominal, use of the Set feature is not required, also
omit
steps 2-
4 for the Range Gain Points.
On each range, the Multimeter automatically recognizes the appropriate value as range zero or range gain from the applied signal amplitude and polarity.
Zero Point
1.
On the Multimeter, select the required range.
2.
On the Calibrator, set to zero output and Operate.
3.
On the Multimeter, press
CAL to enter the
CALIBRATION
menu.
4.
Press
SAMPLE to initiate the calibration operation.
Calibration is complete when the Busy legend goes out and the calibrated measurement is displayed.
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Calibration and Verification
Routine Calibration
3
Range Gain Points
1.
On the Calibrator, select the positive Range Gain point Output value.
2.
On the Multimeter, Press
CAL to revert to
CALIBRATION
menu.
3.
Select
Set
on the
CALIBRATION menu
.
4.
Use the numeric keys with the
SET VALUE
menu to key in the true output value of the calibrator at the range gain value, then press Enter.
5.
Press
SAMPLE
to initiate the calibration operation.
6.
Calibration is complete when the Busy legend goes out and the calibrated measurement is displayed.
7.
On the Calibrator, select the negative Range Gain point Output value.
8.
Repeat steps 3 to 5 above to calibrate the negative Range gain point.
9.
On the Calibrator, set
STANDBY
.
10.
Press the DCI key to revert to the ranges menu.
AC Current Calibration
XW
Warning
The Calibrator can deliver a lethal electric shock.
To avoid electric shock when performing the following calibration procedures:
•
Never touch any lead or terminal unless you are absolutely certain that no dangerous voltage is present.
•
Make sure that signal leads are in a safe condition before you handle them in any way.
Initial Setup and Connections
1.
Press the ACI key, and select the
200μA
range.
2.
Press the
CONFIG
key.
In calibration mode in the ACI function resolution defaults to
RESL6
and the 100Hz RMS filter is automatically selected. It is recommended that this resolution and 100Hz Filter is used for calibration of all ACI ranges.
3.
Reselect
ACI
.
4.
Confirm that the Multimeter is configured for internal guard (External Guard is deselected) by checking that the
Ext Grd
legend does not appear on the left-hand display.
5.
Ensure that the calibrator output is set to
STANDBY
and configured for Internal
Guard (
EXT GRD
is deselected).
6.
Connect the Calibrator to the Multimeter as shown above.
Range Zero and LF Gain Calibration Procedure
Using the following procedure to calibrate range zero then range gain on all ACI ranges at the currents and frequencies detailed in Table 3-7. Just one range can be calibrated if required, but for a full-calibration start with the 200 µA range and work up to the 20A range. http://www.elso.sk
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8508A
Service Manual
Table 3-7. AC Current Calibration Points and Sequence
8508A Range
200
μ
A
2 mA
20 mA
200 mA
2 A
20 A
Point
Zero (5 % Range)
Range Gain
Zero (0.5 % Range)
Range Gain
Zero (0.5 % Range)
Range Gain
Zero (5 % Range)
Range Gain
Zero (5 % Range)
Range Gain
Zero (5 % Range)
Range Gain
Current
10
μ
A
100
μ
A
10
μ
A
1 mA
100
μ
A
10 mA
10 mA
100 mA
100 mA
1 A
1 A
10 A
Frequency
300 Hz
300 Hz
300 Hz
300 Hz
300 Hz
300 Hz
300 Hz
300 Hz
300 Hz
300 Hz
300 Hz
300 Hz
The procedure assumes the user has knowledge of the actual output value of the calibrator at each point, from a measurement or from a certificate of calibration. The
Set feature allows a user to enter the true output value of the calibration standard where it differs from the nominal point. If the calibrator output is considered to be exactly nominal, use of the
Set
feature is not required, also
omit
steps 3-5.
On each range, the Multimeter automatically recognizes the appropriate value as range zero or range gain from the applied signal amplitude.
1.
On the Multimeter, select the required Range.
2.
On the Calibrator select Output Current and Frequency, Operate.
3.
On the Multimeter, Press
CAL to revert to
CALIBRATION
menu.
4.
Select
Set
on the
CALIBRATION menu
.
5.
Use the numeric keys with the
SET VALUE
menu to key in the true output value of the calibrator, then press Enter.
6.
Press
SAMPLE to initiate the calibration operation.
Calibration is complete when the
Busy
legend goes out and the calibrated measurement is displayed.
7.
On the Calibrator, set Output to
STANDBY
.
8.
On the Multimeter, press
ACI
key to revert to the ranges menu.
Frequency Calibration
The Multimeter frequency calibration operation requires a signal at exactly 1MHz (
Set
is not available on the Multimeter for frequency calibration). If the calibrator frequency output is not exactly nominal or sufficiently close to nominal it may be phase locked to an external reference frequency at the required output frequency applied to its rear panel phase lock input, for example from a laboratory frequency standard or off-air reference receiver. If used, the calibrator should be disconnected from the frequency reference and phase locking disabled before attempting any other calibration operations with the calibrator.
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Calibration and Verification
Routine Calibration
3
Alternatively, the 1MHz frequency reference may be used directly as an input signal for the Multimeter for frequency calibration.
Initial Setup and Connections
1.
Press the
ACV
key, select the
2 V
range.
2.
Confirm that the Multimeter is configured for internal guard (External Guard is deselected) by checking that the
Ext Grd
legend does not appear on the left-hand display.
3.
Ensure that the calibrator output is set to
STANDBY
and configured for Internal
Guard (
EXT GRD
is deselected).
4.
Connect the Calibrator to the Multimeter as shown above.
5.
If required, connect the calibrator rear panel phase lock input to a 1MHz reference frequency and enable phase locking via the front panel menus.
Procedure
1.
On the calibrator select 1V 1MHz, Operate.
2.
On the Multimeter, Press
CAL to enter the
CALIBRATION
menu, and select
SPCL
.
3.
Select
Freq to initiate the calibration operation.
Calibration is complete when the Busy legend goes out.
4.
On the Calibrator, set
STANDBY
.
Exit From Calibration Mode and Non-Volatile Input Offset Adjustment
Use the following procedure to perform non-volatile input offset adjustment on all DCV and resistance ranges (including LoI, 2-wire, and 4-wire) for the front and rear inputs.
Initial Setup and Connections
1.
Press the
CAL key and select
Quit
.
2.
From the
CAL DUE ? menu select
Quit.
3.
The Multimeter will exit from
CAL mode, the
CAL legend on the main display will extinguish, and he right-hand display will revert to the currently selected function menu.
4.
Disconnect all calibration leads and connect a 8508-7000K precision 4-wire short device to the front input terminals and also, if fitted, to the input terminals as shown above.
Procedure
Omit step 4 if the Multimeter is not fitted with rear input terminals.
1.
Press the
DCV
key
2.
Press the
INPUT
key and select
Front
.
3.
From the
INPUT
menu select
Zero Func
to perform zero offset adjustment on all ranges.
4.
From the
INPUT
menu select
Rear
. Repeat step 3.
5.
Press the Ω key and select the 2
Ω
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6.
Press the
CONFIG
key and select
Filt
,
LoI
and
4w
Ω . Repeat steps 3 and 4.
7.
Press the
CONFIG
key and select
2w
Ω . Repeat steps 3 and 4.
8.
Press the
CONFIG key, select
4w
Ω and de-select
LoI
. Repeat steps 3 and 4.
9.
Press the
CONFIG
key and select
2w
Ω . Repeat steps 3 and 4.
10.
Press the Ω
PLUS
key and select
Tru
Ω . From the
Tru
Ω menu the 2
Ω
range.
11.
Press the
CONFIG
key and select
Filt
and
LoI
. Repeat steps 3 and 4.
12.
Press the
CONFIG key and de-select
LoI
. Repeat steps 3 and 4.
13.
Press the Ω
PLUS
key and select
HiV
Ω . From the
HiV
Ω menu the 20M
Ω
range.
14.
Press the
CONFIG
key and select
Filt
and
2w
Ω . Repeat steps 3 and 4.
15.
Press the
CONFIG key and select
4w
Ω . Repeat steps 3 and 4.
16.
Press the
DCV
key and remove the shorting devices from the input terminals.
Cal Due Date Entry and Calibration Mode Disable
On completion of all calibration operations it is recommended that the user updates the stored
CAL due date with the date for next recalibration. For consistency, this date should be the same as the calibration due date shown on any calibration stickers the user may also attach to the Multimeter. It is also recommended that a calibration seal or integrity sticker is applied to prevent unauthorized access to the rear panel calibration enable switch.
Set Cal Due Date
1.
Press the
CAL key and select Quit.
2.
From the
CAL DUE ?
menu select Enter.
3.
Use the keypad to key in the calibration due date. Up to eight characters may be entered in any format. Any character available from the keypad may be used, but it is recommended that one of the common date formats such as dd.mm.yy or mm.dd.yy is used for ease of interpretation.
4.
Press Enter to store the
CAL due date.
Disable cal mode
1.
Set the rear panel Calibration Enable switch to
DISABLE
.
2.
Apply a security seal to cover the rear panel Calibration Enable switch to prevent unauthorized access.
ACV Spot Frequency Calibration
The ACV Spot frequency mode calibration is not normally performed as part of routine calibration. ACV Spot frequency calibration is only performed if the user intends to make use of spot frequency mode. In spot frequency mode the accuracy of AC Voltage measurements can be improved by calibrating the Multimeter at specific frequencies of interest, reducing frequency response flatness errors at these points. The following procedure provides guidance on spot frequency calibration for users wishing to make use of Spot frequency mode.
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Calibration and Verification
Performance Verification
3
To Calibrate at Spot Frequencies
Spot Calibration is available only when in AC Voltage function with Spot already selected on the
ACV CONFIG
menu. Each spot (six per range) can be calibrated at a valid input frequency to a non-nominal RMS value. In subsequent use, frequency response flatness errors are reduced within ±10 % of the calibrated spot frequency.
Assuming that the Multimeter is in calibration mode and the setup is connected as described above under
Initial Setup and Connections
for routine calibration. The configuration defaults to
Tfer
and
RESL6
(both required).
Proceed as follows:
1.
Select
ACV
and select the required Range.
2.
Press the
CONFIG
key and select
Spot
.
3.
Press the
CAL key.
The
CALIBRATION
menu is displayed.
4.
Select
Set
.
The
SPOT CAL menu is displayed.
5.
Select the soft key for the required spot, 1 to 6 (
Sp1
to
Sp6
).
The SPOT (x = 1 to 6) RMS menu is displayed.
6.
Key in the true RMS output value of the standard, then select
Enter
.
The
SPOT FREQUENCY
menu is displayed, showing the frequency at which the spot will be calibrated.
7.
Press
SAMPLE to initiate the calibration operation.
Calibration is complete when the
Busy
legend goes out and the calibrated measurement is displayed. The menu display reverts to the
SPOT CAL menu.
8.
On the Calibrator, set
STANDBY
.
9.
On the Multimeter, select other spots as required, repeating the process for each selection.
10.
Exit from the
SPOT CAL menu by pressing any hard key.
Performance Verification
The 8508A Digital Reference Multimeter offers state of the art performance. This procedure is intended as a guide for qualified metrology personnel who have access to a standards laboratory with equipment available to verify the performance of an instrument of this level of accuracy. The procedure assumes users are familiar with relevant best measurement practice, and will take precautions to avoid introducing errors from sources such as thermal emfs, leakages, electromagnetic interference, etc. It also assumes users will make adequate allowance for equipment stabilization and measurement settling times.
This routine performance verification procedure describes the test points and sequence of operations required to check the Multimeter and assumes calibration references of adequate traceable uncertainty are available – in this case a Fluke 5720A calibrator and
5725A amplifier used with an 8508A-7000 Calibration Kit. The procedure assumes the user is able to calibrate and characterize the calibration standards, without describing the process required to do so. Refer to the Routine Calibration section for more information on the characterization process. http://www.elso.sk
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Equipment Requirements
The equipment required for performance verification of the Multimeter is identical to the equipment required for routine calibration listed in Table 3-1. Alternate equipment may be used, but users should ensure it provides adequate uncertainties, and consider the impact of those uncertainties on allowable tolerance limits.
Interconnections
The Fluke 8508A-7000K Calibration kit contains a specially designed lead set which connects directly to the terminals of the Multimeter, the 5720A, and the 5725A for the purpose of Multimeter calibration and performance verification. It is recommended that this lead kit be used to avoid introducing measurement errors due to interconnections and to duplicate the configuration used by Fluke for Multimeter calibration. A diagram showing the interconnections used in detail appears in the Routine Calibration section. If alternate leads are substituted users must ensure they are metrology grade leads, and of adequate voltage and current rating. Leads should be kept as short as possible, constructed from low capacitance low leakage dielectric material (PTFE) with low thermal emf terminations, and exactly duplicate the configuration and interconnections shown.
When checking the 2 G
Ω
and 20 G
Ω
resistance ranges the 1 G
Ω
standard resistor supplied in the Fluke 8508A-7000K Calibration kit plugs directly into the Multimeter’s front input terminals without any interconnecting leads. If alternate resistance standards are used for verifying performance of the resistance function, refer to the resistance measurements section of Chapter 3
Making Measurements
for connection details.
Applicable Verification Tolerance and Conditions
The tolerances* listed in this verification procedure are derived from the Multimeter’s
365 day Tcal
±
1
°
C 99 % Confidence Level Absolute specifications, which include contributions for the performance of the Multimeter itself and the uncertainty of the calibration standards used to perform calibration adjustment of the Multimeter at the
Fluke factory. They are applicable to a verification performed within a period of 365 days from calibration and at a temperature within
±
1
°
C of the temperature at which calibration was performed (23
°
C for calibrations performed by Fluke). It is recommended that these tolerances only be used for verification of the Multimeter following calibration by Fluke, and if the above time period and temperature conditions are met. No allowance has been made for the uncertainty of the equipment used for verification. If the required conditions are met but the temperature lies within
±
5
°
C of factory calibration, it is recommended that the user applies the 365 day Tcal
±
5
°
C
Absolute specifications instead.
For other circumstances, such as following calibration by another laboratory, it is recommended that the user derive verification tolerances* from the applicable
Multimeter’s 99 % Confidence Level Relative to Standards specifications (90 day or 365 day) combined with the calibration uncertainties applicable to the previous calibration.
(RSS summation is recommended, with calibration uncertainties also expressed at 99 % confidence level).
The Multimeter’s temperature coefficient specifications should also be applied if the temperature at verification is outside the range applicable to the Multimeter’s specifications.
Refer to Chapter 1 for further information on applying specifications and combining uncertainties.
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Calibration and Verification
Performance Verification
3
* Fluke guarantees the Multimeter’s performance verification using specifications stated to 99 % confidence level.
Preparation
1.
Allow the Multimeter to warm-up under power in the specified environment for at least 4 hours.
2.
Press the
CLEAR
key, select
Pwr Up Dflt
to restore the power up default configuration and display the
DCV
menu.
3.
Press the
Test
key and select
Std to initiate a selftest
. Should the Multimeter fail, contact your local authorized Service Center, ensuring that the full circumstances of the failure are reported.
DC Voltage Checks
XW
Warning
The Calibrator can deliver a lethal electric shock.
To avoid electric shock when performing the following calibration procedures:
•
Never touch any lead or terminal unless you are absolutely certain that no dangerous voltage is present.
•
Make sure that signal leads are in a safe condition before you handle them in any way.
Equipment Configuration
1.
Ensure that the calibrator output is set to
STANDBY
and configured for Internal
Guard (
EXT GRD
is deselected).
2.
Connect the equipment as described for Routine Calibration.
3.
Press the
DCV
key
4.
Press the
CONFIG
key. Select
Filt and
RESL7
.
5.
Confirm that the Multimeter is configured for internal guard (External Guard is deselected) by checking that the
Ext Grd
legend does not appear on the left-hand display.
Procedure
Repeat the following sequence for each range, starting with the 200mV range and working up to the 1kV range, as listed in Table 3-8. An input zero operation is performed on each Multimeter range prior to performing the range verification measurements with the calibrator set to zero by range locking the calibrator in the range from which the output will be obtained.
1.
Select the required Multimeter range.
2.
On the calibrator set the output to zero. Select OPERATE.
3.
On the Multimeter press the
INPUT
key, and select
Zero Rng
to initiate the zeroing operation.
The
Busy
legend will appear, and then extinguish when the zero operation has completed.
4.
On the calibrator select the value required for verification in the positive polarity. http://www.elso.sk
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5.
Note the Multimeter’s reading. Compare the result with the allowable tolerance, taking into account any known error from nominal of the calibrator for this output.
6.
On the calibrator select the value required for verification in the negative polarity.
7.
Note the Multimeter’s reading. Compare the result with the allowable tolerance, taking into account any known error from nominal of the calibrator for this output.
8.
Set the calibrator output to
STANDBY
.
Table 3-8. DC Voltage Verification Points and Sequence
8508A Range Voltage Tolerance
[1]
200 mV
2 V
0 mV
+100 mV
-100 mV
0 V
+1 V
-1 V
Perform input zero operation to calibrator range locked zero output
±
0.00072 mV
±
0.00072 mV
Perform input zero operation to calibrator range locked zero output
±
0.0000045 V
±
0.0000045 V
20 V 0 V
+1 V
+10 V
+19 V
-1 V
-10 V
-19 V
Perform input zero operation to calibrator range locked zero output
±
0.000009 V
±
0.000045 V
±
0.000081 V
±
0.000009 V
±
0.000045 V
±
0.000081 V
200 V 0 V
+100 V
-100 V
Perform input zero operation to calibrator range locked zero output
±
0.00065 V
±
0.00065 V
1000 V 0 V
Perform input zero operation to calibrator range locked zero output
+1000 V
±
0.0066 V
-1000 V
±
0.0066 V
[1] Based on 365 day Tcal
±
1
°
C 99 %CL Absolute specifications. See comments in Applicable Verification Tolerance section above regarding the impact of calibration uncertainties and use of other specifications.
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Calibration and Verification
Performance Verification
3
AC Voltage Checks
XW
Warning
The Calibrator can deliver a lethal electric shock.
To avoid electric shock when performing the following calibration procedures:
•
Never touch any lead or terminal unless you are absolutely certain that no dangerous voltage is present.
•
Make sure that signal leads are in a safe condition before you handle them in any way.
Equipment Configuration
1.
Ensure that the calibrator output is set to
STANDBY
and configured for Internal
Guard (
EXT GRD
is deselected).
2.
Connect the equipment as described for Routine Calibration.
3.
Press the
ACV
key
4.
Press the
CONFIG
key. Select
Tfer On and
RESL6
.
5.
Confirm that the Multimeter is configured for internal guard (External Guard is deselected) by checking that the
Ext Grd
legend does not appear on the left-hand display.
Procedure
Repeat the following sequence for each range, starting with the 200mV range and working up to the 1kV range, as listed in Table 3-9.
1.
Select the required range on the multimeter.
2.
On the Multimeter press
CONFIG
and select the appropriate filter for the point being verified as listed in Table 3-9.
3.
On the calibrator set the output to the voltage and frequency for the point being verified as listed in Table 3-9. Set the output to
OPERATE
.
4.
Note the Multimeter’s reading. Compare the result with the allowable tolerance, taking into account any known error from nominal of the calibrator for this output.
5.
Repeat steps 2 – 4 for each point to be verified on the Multimeter’s range to be verified.
6.
Repeat steps 1 – 5 for each Multimeter range to be verified.
7.
Set the calibrator output to
STANDBY
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8508A Range
200 mV
2 V
20V
Table 3-9. AC Voltage Verification Points and Sequence
1 V
1 V
10 V
10 V
10 V
10 V
10 V
10 V
10 V
10 V
10 V
10 V
19 V
1 V
1 V
1 V
1 V
1 V
1 V
1 V
1 V
Voltage
100 mV
100 mV
100 mV
100 mV
100 mV
100 mV
100 mV
100 mV
1 V
1 MHz
1 kHz
20 Hz
55 Hz
1 kHz
3 kHz
10kHz
30 kHz
60 kHz
100 kHz
500 kHz
1 MHz
1 kHz
55 Hz
1 kHz
3 kHz
10 kHz
30 kHz
60 kHz
100 kHz
500 kHz
Frequency
20 Hz
55 Hz
1 kHz
3 kHz
10 kHz
30 kHz
60 kHz
100 kHz
20 Hz
100 Hz
100 Hz
10 Hz
40 Hz
100 Hz
100 Hz
100 Hz
100 Hz
100 Hz
100 Hz
100 Hz
100 Hz
100 Hz
8508A Filter
10 Hz
40 Hz
100 Hz
100 Hz
100 Hz
100 Hz
100 Hz
100 Hz
10 Hz
40 Hz
100 Hz
100 Hz
100 Hz
100 Hz
100 Hz
100 Hz
100 Hz
Tolerance
1
±
0.000295 V
±
0.000795 V
±
0.000795 V
±
0.034000 V
±
0.034000 V
±
0.00032 V
±
0.00144 V
±
0.00099 V
±
0.00119 V
±
0.00119 V
±
0.00119 V
±
0.00295 V
±
0.00795 V
±
0.00795 V
±
0.34000 V
±
0.34000 V
±
0.00167 V
±
0.0195 mV
±
0.0175 mV
±
0.0149 mV
±
0.0175 mV
±
0.0175 mV
±
0.0445 mV
±
0.0995 mV
±
0.0995 mV
±
0.000144 V
±
0.000119 V
±
0.000099 V
±
0.000119 V
±
0.000119 V
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Calibration and Verification
Performance Verification
3
Table 3-9. AC Voltage Verification Points and Sequence (cont)
8508A Range Voltage Frequency 8508A Filter Tolerance
[1]
200V 100 V
100 V
100 V
100 V
100 V
100 V
100 V
100 V
20 Hz
55 Hz
1 kHz
3 kHz
10 kHz
30 kHz
60 kHz
100 kHz
10 Hz
40 Hz
100 Hz
100 Hz
100 Hz
100 Hz
100 Hz
100 Hz
±
0.0144 V
±
0.0119 V
±
0.0099 V
±
0.0119 V
±
0.0119 V
±
0.0295 V
±
0.0795 V
±
0.0795 V
1000 V 500 V
500 V
500 V
500 V
55 Hz
1 kHz
3 kHz
10 kHz
40 Hz
100 Hz
100 Hz
100 Hz
±
0.088 V
±
0.088 V
±
0.088 V
±
0.088 V
500 V
1000 V
30 kHz
1 kHz
100 Hz
100 Hz
±
0.223 V
±
0.331 V
1000 V 30 kHz 100 Hz
±
1.476 V
[1] Based on 365 day Tcal
±
1
°
C 99 %CL Absolute specifications. See comments in Applicable Verification Tolerance section above regarding the impact of calibration uncertainties and use of other specifications.
Resistance Checks
When verifying the resistance function, each of the resistance modes (Normal
Ω
, Tru
Ω
,
LoI
Ω
and HiV
Ω
) must be individually checked. The following procedure assumes use of a multifunction calibrator and verifies each resistance mode in turn, range by range. If individual standard resistors are used it may be more convenient to check all the modes in turn for each resistance value to avoid connecting the same resistance standard several times during the calibration sequence. A 1 G
Ω
standard resistor is used for ranges above
200 M
Ω
as the highest resistance available from the 5720A calibrator is 100 M
Ω
.
Equipment Configuration
1.
Ensure that the calibrator output is set to
STANDBY
and configured for Internal
Guard (
EXT GRD
is deselected).
2.
Connect the equipment as described for
Routine Calibration
.
3.
Press the
Ω
key
4.
Press the
CONFIG
key. Select
Filt
,
RESL7
, and
4W
Ω
.
5.
Confirm that the Multimeter is configured for internal guard (External Guard is deselected) by checking that the
Ext Grd
legend does not appear on the left-hand display. http://www.elso.sk
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Procedure
Perform the following sequence for each resistance mode and each range, as listed in
Table 3-10, starting with the 2
Ω
range and working up to the 2 G
Ω
range for the
Normal
Ω
and Normal
Ω
LoI resistance modes. Then continue the sequence for the Tru
Ω and Tru
Ω
LoI modes, starting with the 2
Ω
range and working up to the 20 k
Ω
range.
Finally complete the sequence for the HiV
Ω
mode, starting with the 20 M
Ω
range and working up to the 20 G
Ω
range. An input zero operation is performed on each Multimeter range prior to performing the range verification measurements with the calibrator set to zero
Ω
. A separate zero operation is required on each range for each resistance mode.
Note that EX SNS (4-wire) is not available on the 5720A 100 M
Ω
range, and the 8508-
7000K 1 G
Ω
standard resistor is used as a 2-wire device with the calibrator 2-wire resistance zero used for the corresponding zero point.
4W
Ω is deselected on the
Multimeter when checking the 200 M
Ω
and 2 G
Ω
range, range zero, and range gain points.
XW
Warning
The Multimeter can deliver a lethal electric shock when operating in the High Voltage Resistance mode. Voltages up to
240V may appear on the terminals.
To avoid electric shock when performing the following calibration procedures:
•
Never touch any lead or terminal unless you are absolutely certain that no dangerous voltage is present.
•
Make sure that signal leads are in a safe condition before you handle them in any way.
1.
Press the Ω key.
2.
Press the
CONFIG
key and select
Filt
,
RESL7
, and
4w
Ω . Ensure
LoI
is deselected.
3.
Select the required Multimeter range.
4.
On the Calibrator, select zero
Ω
and Operate. Alternatively if using a standard resistor connect the standard resistor for a 4-wire resistance zero. (For the 200 M
Ω range and above, de-select Ex SNS on the calibrator and de-select
4W
Ω
ο n the
Multimeter.)
5.
On the Multimeter press the
INPUT
key, and select
Zero Rng
to initiate the zeroing operation.
The
Busy
legend will appear, and then extinguish when the zero operation has completed.
6.
On the Calibrator, select Range Gain point Output value. Alternatively if using a standard resistor re-connect the standard resistor to measure its resistance.
7.
Note the Multimeter’s reading. Compare the result with the allowable tolerance, taking into account the actual value of the calibrator resistance output for this value or the calibrated value of the resistance standard used.
8.
Repeat steps 3 – 7 for the remaining ranges of the selected resistance mode. (For the
2 G
Ω and 20 G
Ω
ranges the 8508-7000K 1 G
Ω
standard resistor is used in place of the calibrator. For the 200 M
Ω
range and above, de-select Ex SNS on the calibrator and de-select
4W
Ω
ο n the Multimeter).
9.
Set the calibrator output to
STANDBY
.
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Calibration and Verification
Performance Verification
3
2
Ω
20
Ω
200
Ω
2 k
Ω
20 k
Ω
2 M
Ω
2 G
Ω
10.
Press the Ω key.
11.
Press the
CONFIG
key and select
Filt
,
RESL7
,
4w
Ω , and
LoI
.
12.
Repeat steps 3 – 9 for the Normal
Ω
LoI ranges.
13.
Press the Ω
Plus
key and select
Tru
Ω
.
14.
Press the
CONFIG
key and select
Filt
,
RESL7
, and
4w
Ω . Ensure
LoI
is deselected.
15.
Repeat steps 3 – 9 for the
Tru
Ω ranges.
16.
Press the Ω
Plus
key and select
Tru
Ω
.
17.
Press the
CONFIG
key and select
Filt
,
RESL7
,
4w
Ω , and
LoI
.
18.
Repeat steps 3 – 9 for the
Tru
Ω
LoI
ranges.
19.
Press the Ω
Plus
key and select
HiV
Ω
.
20.
Press the
CONFIG
key and select
Filt
,
RESL7
, and
4w
Ω .
21.
Repeat steps 3 – 9 for the
HiV
Ω ranges.
8508A Range
200 k
Ω
20 M
Ω
200 M
Ω
0 k
Ω
100 k
Ω
0 M
Ω
1 M
Ω
0 M
Ω
10 M
Ω
0 M
Ω
100 M
Ω
0 G
Ω
1 G
Ω
0
Ω
1
Ω
0
Ω
10
Ω
0
Ω
100
Ω
0 k
Ω
1 k
Ω
0 k
Ω
10 k
Ω
Table 3-10. Resistance Verification Points and Sequence
Resistance Tolerance
[1]
Normal
Ω
and Tru
Ω
[2]
Normal
Ω
LoI
[2]
Perform input zero operation to calibrator range locked zero output
±
0.0000240
Ω ±
0.0000240
Ω
Perform input zero operation to calibrator range locked zero output
±
0.000133
Ω ±
0.000133
Ω
Perform input zero operation to calibrator range locked zero output
±
0.00101
Ω ±
0.00113
Ω
Perform input zero operation to calibrator range locked zero output
±
0.0000101 k
Ω ±
0.0000113 k
Ω
Perform input zero operation to calibrator range locked zero output
±
0.000101 k
Ω ±
0.000113 k
Ω
Perform input zero operation to calibrator range locked zero output
±
0.00101 k
Ω ±
0.00107 k
Ω
Perform input zero operation to calibrator range locked zero output
±
0.0000117 M
Ω ±
0.0000142 M
Ω
Perform input zero operation to calibrator range locked zero output
±
0.000320 M
Ω ±
0.000570 M
Ω
Perform input zero operation to calibrator range locked zero output
±
0.01950 M
Ω ±
0.18700 M
Ω
Perform input zero operation to calibrator range locked zero output
±
0.0018750 M
Ω ±
0.0018750 M
Ω http://www.elso.sk
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8508A
Service Manual
Table 3-10. Resistance Verification Points and Sequence (cont)
8508A Range Resistance Tolerance
1
HiV
Ω
2
20 M
Ω
200 M
Ω
0 G
Ω
10 M
Ω
0 G
Ω
100 M
Ω
Perform input zero operation to calibrator range locked zero output
±
0.0000202 M
Ω
Perform input zero operation to calibrator range locked zero output
±
0.0000870 M
Ω
2 G
Ω
0 G
Ω
1 G
Ω
Perform input zero operation to calibrator range locked zero output
±
0.0003150 G
Ω
20 G
Ω
0 G
Ω
1 G
Ω
Perform input zero operation to calibrator range locked zero output
±
0.012675 G
Ω
[1] Based on 365 day Tcal
±
1
°
C 99 %CL Absolute specifications. See comments in Applicable Verification Tolerance section above regarding the impact of calibration uncertainties and use of other specifications.
[2] Ranges require separate input zero operation in each resistance mode.
DC Current Checks
Equipment Configuration
1.
Ensure that the calibrator output is set to
STANDBY
and configured for Internal
Guard (
EXT GRD
is deselected).
2.
Connect the equipment as described for Routine Calibration.
3.
Press the
DCI
key
4.
Press the
CONFIG
key. Select
Filt and
RESL7
.
5.
Confirm that the Multimeter is configured for internal guard (External Guard is deselected) by checking that the
Ext Grd
legend does not appear on the left-hand display.
Procedure
Repeat the following sequence for each range, starting with the 200
μ
A range and working up to the 20A range, as listed in Table 3-11. An input zero operation is performed on each Multimeter range prior to performing the range verification measurements with the calibrator set to zero by range locking the calibrator in the range from which the output will be obtained.
1.
Select the required Multimeter range.
2.
On the calibrator set the output to zero. Select OPERATE.
3.
On the Multimeter press the
INPUT
key, and select
Zero Rng
to initiate the zeroing operation.
The
Busy
legend will appear, and then extinguish when the zero operation has completed.
4.
On the calibrator select the value required for verification in the positive polarity.
5.
Note the Multimeter’s reading. Compare the result with the allowable tolerance, taking into account any known error from nominal of the calibrator for this output.
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Calibration and Verification
Performance Verification
3
6.
On the calibrator select the value required for verification in the negative polarity.
7.
Note the Multimeter’s reading. Compare the result with the allowable tolerance, taking into account any known error from nominal of the calibrator for this output.
Table 3-11. DC Current Verification Points and Sequence
8508A Range
200
μ
2 mA
A
Current
0
μ
A
+100
μ
A
-100
μ
A
0 mA
+1mA
-1mA
Tolerance
[1]
Perform input zero operation to calibrator range locked zero output
±
0.00190
μ
A
±
0.00190
μ
A
Perform input zero operation to calibrator range locked zero output
±
0.0000190 mA
±
0.0000190 mA
20 mA
200 mA
2 A
0 mA
+10mA
-10mA
0 mA
+100mA
-100mA
0 A
+1A
-1A
Perform input zero operation to calibrator range locked zero output
±
0.000200 mA
±
0.000200 mA
Perform input zero operation to calibrator range locked zero output
±
0.00530 mA
±
0.00530 mA
Perform input zero operation to calibrator range locked zero output
±
0.0002260 A
±
0.0002260 A
20 A 0 A
Perform input zero operation to calibrator range locked zero output
+10A
±
0.004950 A
-10A
±
0.004950 A
[1] Based on 365 day Tcal
±
1
°
C 99 %CL Absolute specifications. See comments in Applicable Verification Tolerance section above regarding the impact of calibration uncertainties and use of other specifications.
AC Current Checks
Equipment Configuration
1.
Ensure that the calibrator output is set to
STANDBY
and configured for Internal
Guard (
EXT GRD
is deselected).
2.
Connect the equipment as described for Routine Calibration.
3.
Press the
ACI
key
4.
Press the
CONFIG
key. Select
RESL6 and 100Hz Filter.
5.
Confirm that the Multimeter is configured for internal guard (External Guard is deselected) by checking that the
Ext Grd
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3-42
Procedure
Repeat the following sequence for each range, starting with the 200
μ
A range and working up to the 20A range, as listed in Table 3-12.
1.
Select the required Multimeter range.
2.
On the calibrator set the output to the current and frequency for the point being verified as listed in Table 3-12. Set the output to
OPERATE
.
3.
Note the Multimeter’s reading. Compare the result with the allowable tolerance, taking into account any known error from nominal of the calibrator for this output.
4.
Repeat steps 2 – 4 for each point to be verified on the Multimeter’s range to be verified.
5.
Repeat steps 1 – 5 for each Multimeter range to be verified.
6.
Set the calibrator output to
STANDBY
.
Table 3-12. AC Current Verification Points and Sequence
8508A Range Current Frequency Tolerance
[1]
200
μ
2 mA
A
20 mA
200 mA
100
100
100
100
100
μ
μ
μ
μ
μ
A
A
A
A
A
1 mA
1 mA
1 mA
1 mA
1 mA
10 mA
10 mA
10 mA
10 mA
10 mA
100 mA
300 Hz
1 kHz
3 kHz
5 kHz
10 kHz
300 Hz
1 kHz
3 kHz
5 kHz
10 kHz
300 Hz
1 kHz
3 kHz
5 kHz
10 kHz
300 Hz
±
0.0830
μ
A
±
0.0830
μ
A
±
0.0830
μ
A
±
0.0830
μ
A
±
0.0830
μ
A
±
0.000580 mA
±
0.000580 mA
±
0.000580 mA
±
0.000580 mA
±
0.000580 mA
±
0.00580 mA
±
0.00580 mA
±
0.00580 mA
±
0.00580 mA
±
0.00580 mA
±
0.0545 mA
2 A
100 mA
100 mA
100 mA
100 mA
1 A
1 A
1 A
1 A
1 kHz
3 kHz
5 kHz
10 kHz
300 Hz
1 kHz
3 kHz
5 kHz
±
0.0545 mA
±
0.0545 mA
±
0.0545 mA
±
0.0545 mA
±
0.000945 A
±
0.000945 A
±
0.001055 A
±
0.001055 A
20 A
1 A
10 A
10 A
10 A
10 kHz
300 Hz
1 kHz
3 kHz
±
0.001055 A
±
0.01140 A
±
0.01140 A
±
0.02740 A
10 A
10 A
5 kHz
10 kHz
±
0.02740 A
±
0.02740 A
[1] Based on 365 day Tcal
±
1
°
C 99 %CL Absolute specifications. See comments in Applicable Verification Tolerance section above regarding the impact of calibration uncertainties and use of other specifications. http://www.elso.sk
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Calibration and Verification
Performance Verification
3
Frequency Checks
Equipment Configuration
1.
Ensure that the calibrator output is set to
STANDBY
and configured for Internal
Guard (
EXT GRD
is deselected).
2.
Connect the equipment as described for Routine Calibration.
3.
Press the
ACV
key, select the 2V range
4.
Press the
CONFIG
key. Select
Tfer On, Filt 40Hz.
5.
Confirm that the 8508A is configured for internal guard (External Guard is deselected) by checking that the
Ext Grd
legend does not appear on the left-hand display.
Procedure
1.
On the 8508A press
MONITOR
and then
CONFIG
. Deselect
FREQ GATE Fast
.
2.
Press the
MONITOR key
and select
FREQ
.
3.
On the calibrator set the output to the voltage to 1V and frequency to 1MHz. Set the output to
OPERATE
.
4.
Note the Multimeter’s frequency reading. Check the result is within
±
0.000012MHz, taking into account any known error from nominal of the calibrator output frequency for this point.
5.
Set the calibrator output to
STANDBY
. http://www.elso.sk
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static awareness
A Message From
Fluke Corporation
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. Leaning the guidelines for handling them.
3. Using the procedures, packaging, and
bench techniques that are recommended.
The following practices should be followed to minimize damage to S.S. (static sensitive) devices.
1. MINIMIZE HANDLING
3. DISCHARGE PERSONAL STATIC BEFORE
HANDLING DEVICES. USE A HIGH RESIS-
TANCE GROUNDING WRIST STRAP.
2. KEEP PARTS IN ORIGINAL CONTAINERS
UNTIL READY FOR USE.
4. HANDLE S.S. DEVICES BY THE BODY.
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5. USE STATIC SHIELDING CONTAINERS FOR
HANDLING AND TRANSPORT.
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
PROTECT INSTALLED S.S. DEVICES.
6. DO NOT SLIDE S.S. DEVICES OVER
ANY SURFACE.
7. AVOID PLASTIC,VINYL AND STYROFOAM
®
IN WORK AREA.
PORTIONS REPRINTED
WITH PERMISSION FROM TEKTRONIX INC.
AND GERNER DYNAMICS, POMONA DIV.
®
Dow Chemical http://www.elso.sk
9. HANDLE S.S. DEVICES ONLY AT A
STATIC-FREE WORK STATION.
10. ONLY ANTI-STATIC TYPE SOLDER-
SUCKERS SHOULD BE USED.
11. ONLY GROUNDED-TIP SOLDERING
IRONS SHOULD BE USED.
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Chapter 4
Maintenance
Removing the A5 Bezel Assembly.................................................................. 4-9
Removing the A5A1 Display PCA.................................................................. 4-10
Removing the A6 Rear Input Assembly.......................................................... 4-11
Fuse Replacement and Line-Voltage Selection ................................................... 4-12
Line-Power Fuse F1 and Voltage Selection .................................................... 4-12
Rear-Input Current Fuse F2 (Rear Inputs Option)........................................... 4-13
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Maintenance
Introduction
4
Introduction
This chapter contains access procedures for replaceable assemblies (PCAs) and error messages assocated with the self-test procedure. All of the access procedures describe how to remove a PCA or assembly. In all cases, unless otherwise noted, the reassembly/replacement procedure is a logical reversal of the removal procedure.
Access Procedures
This section of the manual includes access procedures for the following assemblies:
•
A1 DC PCA
•
A2 AC PCA
•
A3 Ohms PCA
•
A4 Digital PCA
•
A5 Bezel Assembly
•
A5A1 Display PCA
•
A6 Rear Input Assembly
Before You Start
To ensure your safety and for the protection of the Multimeter follow all of the considerations and recommendations that follow:
1.
Unless you are qualified to service the the Multimeter do not remove the covers from the unit.
2.
To avoid shock hazards and for the protection of the unit, disconnect all power cords, rear-panel cables, and front/rear test leads from the Multimeter.
3.
Be aware that removing either or both of the cover(s) will void calibration of the
Multimeter.
4.
Before removing the covers, place the Multimeter on an appropriate bench top or work surface.
5.
To avoid damage to the Multimeter from static electricity, use best practice anti-static techniques after the covers are removed from the Multimeter.
6.
Do not unnecessarily touch any part of the PCAs or straighten component positions on the PCAs. http://www.elso.sk
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Cabling and Wiring Connections
To help avoid making incorrect cable connections during reassembly, refer to the internal wiring and cabling diagram shown in Figure 4-1.
FRONT
A5A1
J202 J201
A5A1 Display PCA
SENSE
HI
LO
GUARD
INPUT
HI
LO
A
A2
A1
A3
W6 (16)
A4
W5 (16)
GRN WHT
BLU BRN BLK
RED
J801
A1 DC PCA (top)
4-4
+
A3 Ohms PCA
A2 AC PCA
PL33
(16_pin)
J301
J801
J154
J15
J152 J153
A1 DC PCA
(top)
J151
(10)
J201
(4)
(3)
T2 T1
Power Input and
Voltage Selection
Module
J401
BACK
(4)
J202
Figure 4-1. Internal Wiring and Cabling Diagram
http://www.elso.sk
J401
(4)
A4
Digital
PCA
avw032f.eps
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Maintenance
Access Procedures
4
Removing the A1 DC PCA
Use the following procedure to remove the A1 DC PCA. See Figure 4-2.
1.
Position the unit on the work surface so it is bottom-side up.
2.
Remove both rear feet
A
. a.
Remove the three hex screws from each foot. b.
If the feet are still in place, pull them from the unit.
3.
Remove the bottom cover
B
. a.
Remove the one philips screw at rear of the bottom cover. b.
Slide the cover toward the back of the unit, and lift it off.
4.
Remove the bottom shield
C
. a.
Remove the six philips screws from the shield. b.
Slide the shield toward front of unit, and lift it out.
5.
Remove the A1 DC PCA
D
. a.
Disconnect the Rear Input PCA from the A1 DC PCA. b.
Disconnect the five connectors from the rear edge of the A1 DC PCA. c.
Disconnect the 10 connectors from the front edge of the A1 DC PCA. d.
Disconnect the red and black wires from the screw termininals on the PCA. e.
Remove the two philips screws from the A1 DC PCA. f.
Slide the A1 DC PCA to the side and lift it from the chassis.
2
3
4
1 avw010f.eps
Figure 4-2. Removing the A1 DC PCA
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8508A
Service Manual
Removing the A2 AC PCA
Use the following procedure to remove the A2 AC PCA. See Figure 4-3.
1.
Position the unit on the work surface so it is top-side up.
2.
Remove both rear feet.
A a.
Remove the three hex screws from each foot. b.
If the feet are still in place, pull them from the unit.
3.
Remove the top cover.
B a.
Remove the one philips screw at rear of the top cover. b.
Slide the cover toward the back of the unit, and lift it off.
4.
Remove the top shield.
C a.
Remove the four philips screws from the shield.
D b.
Slide the shield toward front of unit, and lift it out.
5.
Remove the A2 AC PCA.
E a.
Remove the eight philips screws holding the shield to the A2 AC PCA. b.
Lift the shield from the PCA. c.
Disconnect the one connectors from the rear edge of the A2 AC PCA. d.
Disconnect the three connectors from the front edge of the A2 AC PCA. e.
Remove the four philips screws from the PCA. f.
Using a flat-blade screwdriver, remove the four plastic standoffs from the PCA. g.
Lift the A2 AC PCA from the chassis.
2
3
5
4
4-6
1
Figure 4-3. Removing the A2 AC PCA
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Maintenance
Access Procedures
4
Removing the A3 Ohms PCA
Use the following procedure to remove the A3 Ohms PCA. See Figure 4-4.
1.
Position the unit on the work surface so it is bottom-side up.
2.
Remove both rear feet.
A a.
Remove the three hex screws from each foot. b.
If the feet are still in place, pull them from the unit.
3.
Remove the bottom cover.
B a.
Remove the one philips screw at rear of the bottom cover. b.
Slide the cover toward the back of the unit, and lift it off.
4.
Locate the two connectors on the A1 DC PCA with the green, red, orange, yellow and the black, brown wires.
5.
Disconnect both connectors from the A1 DC PCA. These cables are hardwired to the
A3 Ohms PCA and must be disconnected before the A3 Ohms PCA can be removed.
6.
Position the unit on the work surface so it is top-side up.
7.
Remove the top shield.
C a.
Remove the four philips screws from the shield. b.
Slide the shield toward front of unit, and lift it out.
8.
Remove the A3 Ohms PCA.
D a.
Disconnect the two connectors from the rear edge of the A3 Ohms PCA. b.
Remove the one philips screws from the A3 Ohms PCA. c.
Slide the A3 Ohms PCA toward the rear of the unit (about ¼ inch). d.
Lift the A3 Ohms PCA, and free the two hardwired cables before removing it from the unit.
2
3
4
1 avw012f.eps
Figure 4-4. Removing the A3 Ohms PCA
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8508A
Service Manual
Removing the A4 Digital PCA
Use the following procedure to remove the A4 Digital PCA. See Figure 4-5.
1.
Position the unit on the work surface so it is top-side up.
2.
Remove both rear feet.
A a.
Remove the three hex screws from each foot. b.
If the feet are still in place, pull them from the unit.
3.
Remove the top and bottom covers.
BC a.
Remove one philips screw at rear of each cover. b.
Slide the covers toward the back of the unit, and lift them off.
4.
Remove the Rear Panel
D a.
Remove the six flat-head philips screws from the rear panel (two on either side of the panel and two with the input/sense connector group. b.
Remove the seven pan-head philips screws distributed across the rear panel. c.
Pull the gray sheet metal portion of the rear panel away from the unit.
5.
Set the unit on its side, and remove the screw holding the input/sense connector group to the chassis.
E
6.
Return the unit to its original position.
7.
Disconnect the five cable connectors from the A4 Digital PCA.
8.
Free the A4 Digital PCA by sliding it out the rear of the chassis.
F
2
6
4-8
1
4
5
Figure 4-5. Removing the A4 Digital PCA
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Maintenance
Access Procedures
4
Removing the A5 Bezel Assembly
Use the following procedure to remove the A5 Bezel Assembly. See Figure 4-6.
1.
Position the unit on the work surface so it is bottom-side up.
2.
Remove both rear feet.
A a.
Remove the three hex screws from each foot. b.
If the feet are still in place, pull them from the unit.
3.
Remove the bottom cover.
B a.
Remove one philips screw at rear of the bottom cover. b.
Slide the cover toward the back of the unit, and lift it off.
4.
Remove the bottom shield
C
. a.
Remove the six philips screws from the shield. b.
Slide the shield toward front of unit, and lift it out.
5.
Locate the five connectors (J109 through J113) on the A1 DC PCA with the green and white, blue, brown, red, and black wires. (When reassembling the unit make sure you reconnect the connectors in the left to right color sequence described in this step).
6.
Disconnect all five connectors from the A1 DC PCA. These cables are hardwired to the A5 Bezel Assembly and must be disconnected before the A5 Bezel Assembly can be removed.
7.
Remove the two hex screws from the side of each of the front handles.
D
8.
Thread the disconnected cables/wires through the chassis opening and pull the A5
Bezel Assembly a few inches away from the unit.
E
9.
Free the A5 Bezel Assembly from the unit by disconnecting the two ribbon cables from the A5A1 Display PCA.
2
3
1
4 5 avw014f.eps
Figure 4-6. Removing the A5 Bezel Assembly
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8508A
Service Manual
Removing the A5A1 Display PCA
Use the following procedure to remove the A5A1 Display PCA. See Figure 4-7.
1.
Remove the A5 Bezel Assembly (described earlier in this chapter).
2.
Remove the seven small self-threading Philips screws holding the A5A1 Display
PCA to the plastic bezel (front panel).
A
3.
Lift the top of the A5A1 Display PCA until it clears the lip of the bezel, and then pull the A5A1 Display PCA toward the lip of the plastic bezel.
B
Before reassembling the A5 Bezel Assembly, check the position of the rubber key pads to ensure that all of the buttons are correctly seated in their holes.
C
3
1
2
Figure 4-7. Removing the A5A1 Display PCA
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Maintenance
Access Procedures
4
Removing the A6 Rear Input Assembly
Use the following procedure to remove the A6 Rear Input Assembly. See Figure 4-8.
1.
Position the unit on the work surface so it is bottom-side up.
2.
Remove both rear feet.
A a.
Remove the three hex screws from each foot. b.
If the feet are still in place, pull them from the unit.
3.
Remove the top and bottom covers.
BC a.
Remove the one philips screw at the rear of each of the covers. b.
Slide the covers toward the back of the unit, and lift them off.
4.
Remove the Rear Panel.
D a.
Remove the six flat-head philips screws from the rear panel (two on either side of the panel and two with the input/sense connector group. b.
Remove the seven pan-head philips screws distributed across the rear panel. c.
Pull the gray sheet metal portion of the rear panel away from the unit.
5.
Remove the bottom shield
E
. a.
Remove the six philips screws from the shield. b.
Slide the shield toward front of unit, and lift it out.
6.
Locate, and remove the screw holding the input/sense connector group to the chassis.
F
7.
Cut the tie holding the input/sense connector cable to the chassis.
8.
Using a pair of long-nose pliers, release (depress) the latch on each of the three standoff clips holding the A6A1 Rear Input PCA to the A1 DC PCA.
9.
With all three latches released on the standoffs, gently unplug the A6A1 Rear Input
PCA from the A1 DC PCA by lifting it straight up and away from its connectors on the A1 DC PCA.
G
2
7
5
6
1
3
4 avw016f.eps
Figure 4-8. Removing the A6 Rear Input Assembly
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8508A
Service Manual
Fuse Replacement and Line-Voltage Selection
W
Caution
To avoid fire hazard, use only the fuse arrangements that appear in the fuse specification Tables 4-1 and 4-2 below.
Additionally, the supply network must be fused at a maximum of 16 A, and if the power cable plug is internally fused, a 5 A fuse must be fitted in the power cable plug.
To avoid shock hazards, disconnect all line-power and input terminal connections before attempting to access the fuse(s).
Line-Power Fuse F1 and Voltage Selection
The power-input and voltage-selection module on the rear of the Multimeter houses the line-power fuse F1. See Figure 4-9. A fuse tray to the right of the module serves as a fuse holder and a line-voltage-selection device. A small window on the fuse tray shows the currently selected line voltage, 115 or 230. The fuse rating is a function of the selected line voltage as shown in Table 4-1.
Use the following procedure to change the fuse or change the line power selection:
1.
Remove the fuse tray by placeing a small screwdriver blade under the tab on the fuse tray and pulling the tray from the module.
2.
To change the voltage selection, rotate and position the fuse holder in the tray so the desired line voltage shows in the fuse-tray window.
3.
As necessary, remove and replace the fuse with one that corresponds to the selected line voltage. See Table 4-1.
4.
Slide the fuse tray back into the power-input and voltage-selection module, and secure it by firmly pressing it into place.
4-12
Power Input
Fuse F1
115 VAC
230 VAC adj019f.eps
Figure 4-9. Rear Panel – Power Input Fuse and line Power Locations
Fuse Action
TH
Time delay HBC
TH
Time delay HBC
Table 4-1. Power Input Fuse 1
Fuse Rating
IEC 127 (UL/CSA)
1.25 A (2 A) @ 250V
630 mA (1 A) @ 250V
Fluke
Part No.
920204
920203
Manufacturer
& Type No.
Schurter
001.2505
Schurter
001.2502 http://www.elso.sk
riešenia na presné meranie
Maintenance
Self Test
4
Rear-Input Current Fuse F2 (Rear Inputs Option)
The rear input option includes a fuse (F2) to limit the current at the rear-input A terminal to 2A. The fuse is located at the rear of the Multimeter just to the left of the current input terminal (A). A half-twist of the fuse cap releases the fuse for inspection or replacement.
Use the fuse specified in Table 4-2 when replacement is necessary.
Fuse Action
FH
Fast acting HBC
Table 4-2. Current Function Rear Input Fuse 2
Fuse Rating
IEC 127 (UL / CSA)
Fluke Part No.
1.6 A (2 A) 920071
Manufacturer
& Type No.
Beswick S501
Self Test
This section of the manual contains a collection of the error codes which might be generated either on the display of the Multimeter or by way of the IEEE-488 system bus.
Error codes described in this section are shown in tabular form with both the error codes and the descriptions of the most likely faults, causes, or conditions. Typically, the error codes contain two parts, a four digit address code and a two digit id code. However, some error codes consist only of the four digit address. The combination for any given code is identified by the presence or absence of the id column in the error code table.
The error codes are classified as Self-Test Errors, Fatal Errors, Execution Errors, and
Device Dependant Errors. All error conditions other than Fatal Errors are recoverable.
For help in determining what to do in the event of a self-test error, make a note of the full error message and contact your nearest Fluke Service Center.
Self-Test Errors
When a Self-Test is run and successfully completed no error messages result and the
Multimeter is considered operational. If a self-test error does occur, an error message beginning with self test failed shows on the display. A function indicator and a test id number follow to complete the message. See Table 4-3 for descriptions of the selftest errors that might occur.
Test No 10
Test No 11
Test No 20
Test No 21
Test No 22
Test No 23
Test No 24
Test No 25
Test No 26
Test No 27
Err 2101
Err 2101
Err 2201
Err 2211
Err 2221
Err 2231
Err 2241
Err 2251
Err 2261
Err 2271
P001
P002
P003
P004
P005
P006
P007
P008
P009
P010
Table 4-3. Self-Test Errors
DC VOLTS
Main Ref Check
6.2V Ref Check
100mV Range Zero Check
1V Range Zero Check
10V Range Zero Check
100V Range Zero Check
100mV Range Positive Gain Check
100mV Range Negative Gain Check
1V Range Positive Gain Check
1V Range Negative Gain Check http://www.elso.sk
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riešenia na presné meranie
8508A
Service Manual
Test No 28
Test No 29
Test No 30
Test No 31
Test No 50
Test No 51
Test No 60
Test No 61
Test No 62
Test No 63
Test No 64
Test No 65
Test No 66
Test No 67
Test No 68
Test No 69
Test No 70
Test No 71
Test No 72
Test No 73
Test No 74
Err 2281
Err 2291
Err 2301
Err 2311
Test No 40
Test No 41
Test No 42
Test No 43
Test No 44
Test No 45
Test No 46
Test No 47
Test No 48
Test No 49
Err 2401
Err 2411
Err 2421
Err 2431
Err 2441
Err 2451
Err 2461
Err 2471
Err 2481
Err 2491
Err 2501
Err 2511
Err 2601
Err 2611
Err 2621
Err 2631
Err 2641
Err 2651
Err 2661
Err 2671
Err 2681
Err 2691
Err 2701
Err 2711
Err 2721
Err 2731
Err 2741
P011
P012
P013
P014
P032
P033
P034
P035
P036
P037
P038
P039
P040
P041
P042
P043
P052
P053
P054
P055
P056
P057
P058
P044
P045
P046
P047
P048
P049
P050
P051
10V Range Positive Gain Check
10V Range Negative Gain Check
100V Range Positive Gain Check
100V Range Negative Gain Check
DC CURRENT
100 ų
A DC Range: Zero Input Check
100 ų
A DC Range: 100 ų
A Input Gain Check
1mA DC Range: Zero Input Check
1mA DC Range: 1mA Input Gain Check
10mA DC Range: Zero Input Check
10mA DC Range: 10mA Input Gain Check
100mA DC Range: Zero Input Check
100mA DC Range: 100mA Input Gain Check
1A DC Range: Zero Input Check
1A DC Range: 100mA Input Gain Check
AC CURRENT
1mA AC Range: Zero Input Check
1mA AC Range: 1mA Input Gain Check
RESISTANCE
Follower Offset Check
Follower 100mA Output Check
Follower 10mA Output Check
Follower 1mA Output Check
3.0V Clamp Check
6.7V Clamp Check
27V Clamp Check
Current Sink Clamp Check
10 ų
A Current Sink and Follower 10V Output Check
1 ų
A Current Sink Check
100nA Current Sink Check
10nA Current Sink Check
HV Ohms Follower Offset Check
HV Ohms Follower Output Current Check
HV Ohms Output Voltage and 240V Clamp Check
4-14 http://www.elso.sk
Test No 80
Test No 81
Test No 82
Test No 83
Test No 84
Test No 85
Test No 86
Test No 87
Test No 88
Test No 89
Test No 90
Test No 91
Test No 92
Test No 93
Test No 94
Test No 95
Test No 96
Err 2801
Err 2811
Err 2821
Err 2831
2832 raw
Err 2841
Err 2851
Err 2861
Err 2871
Err 2881
2882 raw
Err 2891
Err 2901
Err 2911
2912 raw
Err 2921
Err 2931
Err 2941
2942 raw
Err 2951
Err 2961
P019
P020
P021
P022
P023
P024
P025
P026
P027
P028
P029
P030
P031 riešenia na presné meranie
Maintenance
Self Test
4
P015
P016
P017
P018
AC VOLTS
100mV AC Range: Zero Input Check
100mV AC Range: +179mV DC Input Checks at
PreAmp Output
100mV AC Range: -179mV DC Input Checks at
PreAmp Output
1V AC Range: Zero Input Check
1V AC Range: +993mV DC Input Checks at
PreAmp Output
1V AC Range: -993mV DC Input Checks at PreAmp
Output
1V AC Range: +993mV DC Input Checks at RMS
Converter Output
1V AC Range: -993mV DC Input Checks at RMS
Converter Output
10V AC Range: Zero Input Check
10V AC Range: +9.78V DC Input Checks at
PreAmp Output
10V AC Range: -9.78V DC Input Checks at PreAmp
Output
100V AC Range: Zero Input Check
100V AC Range: +9.78V DC Input Checks at
PreAmp Output
100V AC Range: -9.78V DC Input Checks at
PreAmp Output
1000V AC Range: Zero Input Check
1000V AC Range: +9.78V DC Input Checks at
PreAmp Output
1000V AC Range: -9.78V DC Input Checks at
PreAmp Output http://www.elso.sk
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riešenia na presné meranie
8508A
Service Manual
Fatal Errors
Fatal errors are reported only via the front panel display. These messages are all coded as
9000 series faults. Each of the fatal errors that might occur are identified in the following paragraphs.
When a fatal error occurs the processor halts the operation of the multimeter. Cycling the power off and on may clear the message. Howerver, fatal errors are generally caused by hardware or software faults which require repair by at a Fluke Service Center.
9000 System Kernel Fault Addr id
This error is generated for system queue errors, stack overflows etc.
See Table 4-4 for descriptions of 9000 system kernel fault errors.
Table 4-4. 9000 System Kernel Fault Errors id Fault
00 user stack overwritten (addr = user stack pointer address)
01
02 activity at head of queue not current (addr = address of queue) current activity not at head of queue (addr = address of queue)
9001 Run Time System Error
This error is detected and generated by the Pascal run time system support e.g. variable out of range.
9002 Unexpected Exception Addr id
See Table 4-5 for descriptions of unexpected exception errors.
Table 4-5. Unexpected Exception Errors id Exception
02 bus error (usually due to addressing non-existant memory or IO)
03 address error (due to attempting a word access to an odd address)
04 illegal instruction
05 zero divide
08 privilege violation
09 trace (trace facility is not used)
10 unimplemented instructions
11 unimplemented instructions
24 spurious interrupt (most likely cause is noise)
9003 PROM Sumcheck Failure
9004 RAM Check Failure
4-16 http://www.elso.sk
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Maintenance
Self Test
4
9005 Serial Interface Fault Addr id
When this fatal error occurs the system will continuously try to repeat whatever it was doing - the user interface will be inoperative.
See Tabe 4-6 for descriptions of the serial interface errors.
id
01
02
03
04
05
06
07
08
Phase Error
Switching counter inoperative
Table 4-6. Serial Interface Errors
NOT Transfer Complete
True Complement Error
In Guard Error
State Change Timeout
A-D timeout
No RTx after abort
Fault
The phase counter is either out of range for the current sequence or an interrupt from the serial interface or delay timer occurred the other was expected. Probably due to corruption of the phase counter. This could be either a software or a hardware fault. a) Tx_complete status was false when "interrupt on
Tx complete" received. b) Tx_complete did not become true within timeout period when "on RTx" received.
Both caused by fault in interface hardware, probably digital ULA fault.
True_compl_error was true after a read transfer.
Tested during read sequence on all transfers Can be because serial data coming from the analog subsystem to the digital ULA is corrupt. Could also be a serial clock or enable problem.
Indicates in_guard circuit latches corrupted, and new update required. Reported as fail after 20 consecutive errors. (This signal may be polled during updates, otherwise it causes an interrupt.)
Interface state change between "read", "wait" and
"write" states did not occur within timeout period.
Interface hardware fault - suggests ULA (or associated signals) problem.
A-D did not produce RTx within hardware timeout period after CI. A-D or hardware fault. Suggests A-
D not being initiated or RTx not getting back to digital ULA. Could be an analog problem if the A-D locks up.
Latched RTx did not appear after abort sent. A-D or
CI hardware fault. Suggests A-D not being initiated or RTx not getting back to digital ULA Could be an analog problem if the A-D locks up.
Switching counter in-operative when tested at power-on. suggests ULA (or associated signals) problem. http://www.elso.sk
4-17
riešenia na presné meranie
8508A
Service Manual
9006 - Serial Loop Mismatch xxxxxxxx id xxxxxxxx
is the actual data received in binary format.
See Table 4-7 for descriptions of the serial loop mismatch errors.
Table 4-7. Serial Loop Mismatch Errors id Fault
00
U901_C pattern mismatch – should be 00000001 (00000000 if rear fitted)
01
02
03
04
05
U901_B pattern mismatch – should be 00010000
U901_A pattern mismatch – should be 10100100
U902_C pattern mismatch – should be 00000000
U902_B pattern mismatch – should be 00000000
U902_A pattern mismatch – should be 00000000
06
07
08
U903_C pattern mismatch – should be 00010101
U903_B pattern mismatch – should be 01111111
U903_A pattern mismatch – should be 11111011
9007 Unknown Engine Instruction Addr id id
indicates the code that the engine was attempting to interpret as an instruction.
Execution Errors
An Execution Error is generated if a received command cannot be executed because it is incompatible with the current device state, or because it attempts to command parameters which are out-of-limits.
In remote operation, the EXE bit (4) is set true in the Standard-defined Event Status Byte, and the error code number is appended to the Execution Error queue.
The error is associated with status reporting, and the queue entries can be read destructively as LIFO by the Common query command EXQ?. There is no queue when execution errors occur during manual operation; instead, the description of the error is sent directly on the Menu display.
See Table 4-8 for descriptions of the execution errors.
4-18 http://www.elso.sk
riešenia na presné meranie
Maintenance
Self Test
4
Table 4-8. Execution Errors
1000-
EXE queue empty when recalled
1024-
Illegal Range/Input Combination
1001-
Option not installed
1025-
Auto not available in Tru ratio
1002-
Calibration disabled
1005-
Input Zero not allowed in Scan
1007-
Data entry error
1026-
Probe identity unrecognized
1027-
Input Zero not allowed in PRT
1028-
Only allowed in Voltage function
1008-
Must be in AC Function
1010-
Divide-by-zero not allowed
1012-
No more errors in list
1013-
Data out of limit
1029-
Scan modes not allowed in PRT
1030-
Scan modes not allowed in ACI/DCI
1031-
4wV not available via rear input
1032-
Input Zero not allowed in Cal
1014-
Illegal Range/Function combination
1033-
Calibration not allowed in PRT
1015-
Command allowed only in Remote
1034-
PRT Ceof Limit @ a+, b+, c+ a-, b-, c-
1016-
Not in Special Calibration
1035-
Cannot edit the default PRT
1021-
Test not allowed when Cal enabled
1036-
Block or Rolling average required
Device Dependant Errors
Device-dependent errors are associated mainly with test and calibration operations. A
Device-Dependent Error is generated if the device detects an internal operating fault
(e.g., during self-test). The DDE bit (3) is set
true
in the Standard-defined Event Status
Byte, and the error code number is appended to the Device-Dependent Error queue.
In remote mode operations, the error is associated with status reporting, and the queue entries can be read destructively as LIFO by the Common query command DDQ?.
In local mode operations, the DDE status is checked at the end of the operation (e.g., Cal,
Zero, Test). If
true
, an error has occurred, and the content of the last entry in the queue is displayed on the front panel.
If both bus and front panel users attempt to read the queue concurrently, the error data is read out destructively on a first-come, first-served basis. Thus one of the users cannot read the data on one interface as it has already been destroyed by reading on the other.
This difficulty should be solved by suitable application programming to avoid the possibility of a double readout. Ideally the IEEE 488 interface should set the instrument into REMS or RWLS to prevent confusion. The bus can ignore the queue, but the front panel user will have to read it to continue.
There are three categories of Device Dependant Errors: Correction Errors, Corruption
Errors, and Miscellaneous Errors. The errors that may occur in each category are described in the Table 4-9. http://www.elso.sk
4-19
8508A
Service Manual
riešenia na presné meranie
Table 4-9. Device Dependent Errors
Correction Errors
2000-
Error During Zero Cal
2001-
Error During Gain+ Cal
The input signal was outside : Zero +/- 1 % of Full
Range
The input signal was outside : +full range +/- 10 % of full range
2002-
Error During Gain- Cal The input signal was outside : -full range +/- 10 % of full range
2003-
2004-
Error During HF trim Cal
2005-
Error During Input Zero
Error During LoI Zero Cal
The input signal was outside : Zero +/- 1 % of full range
The input signal was outside : Zero +/- 1 % of full range
2006-
Error During LoI Gain Cal The input signal was outside : +full range +/- 10 % of full range
2008-
Error During A to D Cal
2010-
2012-
2025-
2026-
2027-
Error During Frequency Cal
Error During DCcp Cal
Error During HiV Lin Read
Error During HiV Lin Calc
Error During 2wr Ohms Calc
Corruptions
2014-
Serial Number Corrupt
2015-
2017-
2018-
2020-
Cal Due Date Corrupt
Bus Address Corrupt
Line Frequency Corrupt
2021-
2022-
Calibration Corrupt
NV RAM Write Failure error numbers between 2030 and 2089 (see section 2)
Micellaneous
2109-
Bad Data from Analog Sys
2022-
2023-
NV Ram write failure
Engine – Load factor err
2024-
Engine – Store factor err
4-20 http://www.elso.sk
riešenia na presné meranie
Chapter 5
List of Replaceable Parts
http://www.elso.sk
5-1
8508A
Service Manual
riešenia na presné meranie
5-2 http://www.elso.sk
riešenia na presné meranie
List of Replaceable Parts
Introduction
5
Introduction
This chapter contains an illustrated list of replaceable parts for the 8508A Reference
Multimeter to the board level only. Parts are listed by assembly; alphabetized by reference designator. Each assembly is accompanied by an illustration showing the location of each part and its reference designator. The parts lists give the following information:
•
Reference designator
•
An indication if the part is subject to damage by static discharge
•
Description
•
Fluke stock number
•
Total quantity
•
Any special notes (i.e., factory-selected part)
W
Caution
A * symbol indicates a device that may be damaged by static discharge.
How to Obtain Parts
Electrical components may be ordered directly from the manufacturer by using the manufacturers part number, or from the Fluke Corporation and its authorized representatives by using the part number under the heading FLUKE STOCK NO. To order components directly from Fluke Corporation, call (toll-free) 800-526-4731. Parts price information is available from the Fluke Corporation or its representatives.
To ensure prompt delivery of the correct part, include the following information when you place an order:
•
Fluke stock number
•
Description (as given under the Description heading)
•
Quantity
•
Reference designator
•
Part number and revision level of the pca containing the part.
•
Instrument model and serial number
How to Contact Fluke
To contact Fluke, call one of the following telephone numbers:
USA: 1-888-99-FLUKE (1-888-993-5853)
Canada: 1-800-36-FLUKE (1-800-363-5853)
Europe: +31 402-675-200
Japan: +81-3-3434-0181
Singapore: +65-738-5655
Anywhere in the world: +1-425-446-5500
Or, visit Fluke's Web site at www.fluke.com
. r
Note
This instrument may contain a Nickel-Cadmium battery. Do not mix with the solid waste stream. Spent batteries should be disposed of by a qualified recycler or hazardous materials handler. Contact your authorized Fluke service center for recycling information.
http://www.elso.sk
5-3
W
F1
W
F1
W
F1
MP3
MP4
MP5
MP6
MP7
MP8
MP9
MP10
H1
H2
H3 riešenia na presné meranie
8508A
Service Manual
Parts Lists
The following tables list the replaceable parts for the 8508A Reference Multimeter . Parts are listed by assembly; alphabetized by reference designator. Each assembly is accompanied by an illustration showing the location of each part and its reference designator. The parts lists give the following information:
•
Reference designator
•
An indication if the part is subject to damage by static discharge
•
Description
•
Fluke stock number
•
Total quantity
•
Any special notes (i.e., factory-selected part)
W
Caution
A * symbol indicates a device that may be damaged by static discharge.
Table 5-1. 8508A Final Assembly
Reference
Designator Part No Qty
Cover, Stripe Side
Bumper, Foot, Self Adhesive
Foot, Rear
Bottom, Foot, Moulded
Bail, Tilt Stand
Label Calibration Sticker
Label, Barcode, ModelL/Serial Number
Label, Modification Record
Washer, M4 Crinkle SS GKN
Screw, 8-32 X 3/8 SH SKTHD Black
Screw, M3 X 8 Pozipan
Fuse 630 mA 250V 20mm (TH)
Fuse 1.6A 250V 20mm (F)
Fuse 1.25A 250V 20mm (TH)
Mains Lead (Power Cord)
Mains Lead IEC TO CEE7/7
Mains Lead IEC UK 5A 2m
Mains Lead IEC AUS/NZ 10A 2.5m
Mains Lead IEC USA/JAPAN
Mains Lead IEC SWISS 10A 2.5m
Mains Lead IEC INDIA 10A 2.5m
SPRT 25R5 -200 TO 660 DEG C
PRT 100R -200 TO 660 DEG C
Users Manual, 8508A
Manual Set, CD, PDF files (includes Service Manual)
1
1
1
1
1
2
3
1
1
2
4
2
4
6
6
2
1
1582145
1582072
1582150
769422
769455
658641
284174
769448
782771
1656430
1654000
1673798
2398145
2398373
1628388
868786
1988619
2398123
2398138
2398114
2398274
295105
2398200
2150143
Not shown
Not shown
Not shown
5-4 http://www.elso.sk
MP2
MP1 riešenia na presné meranie
List of Replaceable Parts
Parts Lists
5
2
MP7
MP8
3
MP4
4
2
MP3
4
MP6
2
H3
2
MP5
6
H1
6
H2
MP9 MP10
Figure 5-1. 8508A Final Assembly
avw025.eps http://www.elso.sk
5-5
riešenia na presné meranie
8508A
Service Manual
Reference
Designator
A2 AC PCA
MP1
MP3
MP2
T1
T2
W1
W2
W3
W4
W5, W6
W7
H7
H8
H9
H10
H11
H12
H13
H14
H3
H4
H5
H6
A6
A401
H1
H2
Rear Input Assembly (optional)
Reference Module POS Assembly
Screw 8-32 X 3/8 SH SKTHD BLK
Screw M3 X 8 Pozipan
Binding Post Brass NiPL
Binding Head Brass NiPL
Clip Cable Flat Ribbon
Washer M3 INT-SHAKP SZP
Nut Full M3 SZP
Washer M6 INT-SHAKP SZP
Nut Full 1/4-28 UNF BNP
Nut Nylock M4 SZP
Washer M4 Plain SZP
Screw M3 X 6 Pozicsk
Standoff M3 X 16 M/F Nylon
Screw M3 X 8 Pozicsk
PCB Card Guide
Bush Insulating 8.8 ID Black
Hole Plug 5/8" Black
Low Voltage Transformer Assembly
Mains Transformer Assembly
Cable Sig I/P Assembly
Cable Ribbon Assembly 16W
Cable Ribbon DC-DIG Assembly
Cable Ribbon DC-OHM Assembly
Cable Ribbon DIG-DS Assembly
Wire 7/.2 PTFE 1 kV Green
Lead Kit PTFE
Lead Kit Standard
1. These are removed when the Rear Input Assembly is installed.
Table 5-2. 8508A Chassis Assembly
Part No
2398242
2398189
2398221
2398192
2398312
2398347
2398358
2398036
2398060
2398008
2398013
2398072
2398085
2398097
2398150
1886203
2398911
1988709 1
1988727 1 *
1988748 1
1988730 1
1605337 1
2398049 1
2398024
295105
1
4
*
2398200
102707
102889
2398320
19
1
1
4
2398239
2398288
2398263
2398301
2398295
2
2
1
1
4
4
22
4
6
2
1
7
1
1
1
2
1
1
1
1
1
1
5-6 http://www.elso.sk
riešenia na presné meranie
MP3
8
H12
4
H13
List of Replaceable Parts
Parts Lists
5
A4
W4
W2
A2
H2
6
AC PCA
Ohms PCA
Top View
H5
2
MP4
10
STICK OVER
SMALL HOLES
A1
H12
10
Bottom view
DC PCA avw026f.eps
Figure 5-2. 8508A Chassis Assembly
http://www.elso.sk
5-7
8508A
Service Manual
T1
T2 riešenia na presné meranie
A1
H2
2
DC PCA
A401
A401
W5
W6
H1
4
FORM RIBBON CABLES
AS SHOWN AND CONNECT
TO CONNECTORS ON REAR
OF DISPLAY BOARD.
A5
Bottom view
WHITE & GREEN
BLUE
BROWN
BLACK
RED
5-8
W1
Figure 5-2. 8508A Chassis Assembly (cont)
avw027f.eps http://www.elso.sk
riešenia na presné meranie
H8
H9
T2
H7
H6
W7
H7
H6
2 H10
2
H11
H3
H4
H14
H5
2
H10
2
H11
2
T1
T2
List of Replaceable Parts
Parts Lists
5
W3
Digital PCA
MP1
2
A4
7
H2
7
MP2
NOT REQUIRED IF
REAR INPUT FITTED avw028.eps
Figure 5-2. 8508A Chassis Assembly (cont)
http://www.elso.sk
5-9
riešenia na presné meranie
8508A
Service Manual
Table 5-3. A5 Bezel (front panel) Assembly
Reference
Designator
A1
C1, C2
H1
H2
H3
H4
H6
H7
J1, J2, J3
J4, J5
J6
L1
Description
Display PCB Assembly
Capicator, ceramic, 470 pF 10% 2 kV
Screws, 8/32 x 3/8
Screw, K25 x 8, POZIPAN SZP, ST
Washer M3, Int-SHAKP SZP
Washer M4, Int-SHAKP SZP
Nut, Full, M3, SZP
Nut Terminal 8-32 UNC
Terminal, Low Thermal, Red
Terminal, Low Thermal, Black
Terminal, Low Thermal, Blue
Ferrite Core, 8680 nH
Fluke
Part No
1988711
2397993
295105
2398217
2398239
2398256
2398288
850334
886382
886379
886366
2398386
1
12
3
2
1
1
Tot Qty
1
2
4
7
1
6
Notes
MP4
W1
Front Panel Decal
Cable Assembly, Front Input
1607677
2398051
1
1
5-10 http://www.elso.sk
riešenia na presné meranie
List of Replaceable Parts
Parts Lists
5
MP1
H2
7
MP5
A1
2
MP2
L1
4
H1
MP2
2
RED WIRE
BLACK WIRES - FIT THIN
WIRE UNDER THICK WIRE
PINK WIRE
ALL WIRES EXCEPT GREEN
LOOP ONCE THROUGH FERRITE
BROWN WIRE
BLUE WIRE
WHITE WIRE
GREEN WIRE
NOTE !!
POSITION CAPACITOR
AWAY FROM OTHER TERMINALS.
H3
H6
C1 C2
12
H7
H4
6
H5
6
RED
BLK
BLK
BLU
RED
RED
J1
J2
J5
J3
J4
J6
MP4
MP3
W1 avw029f.eps
Figure 5-3. A5 Bezel (front panel) Assembly
http://www.elso.sk
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riešenia na presné meranie
8508A
Service Manual
Table 5-4. A6 Rear Input Assembly (optional)
H5
H6
H7
H8
H9
Reference
Designator
A1
C1, C2
W
F1
FH
H1
H2
H3
H11
H12
Rear Input PCA
Capicator CD 470 pF 10% 2 kV
Fuse 1.6 A 250 V 20 mm
Fuse Holder 20 mm Panel Mount
Tie, Cable 3.6 x 142 mm
Washer M4 Int-Shakp SZP
Nut 8-32 UNC Terminal
Washer Terminal Large
Washer M3 Int-Shakp SZP
Nut Full M3 SZP
Screw M3 x 6 POSICSK SZP
Tie Cable 2.5 x 115 mm
Screw M3 x 8 POZIPAN SEMS
Circuit Board, Support
Part No
2399180
2397993
1582072
2398399
2398161
2398256
850334
613606
2398239
2398288
2398189
2398177
2398200
2398364
1
2
1
1
1
6
12
6
1
1
2
3
1
3
886379
886382
886366
2398386
2398106
2
3
1
1
1
J2, J4
J1, J3, J5
J6
L1
W1
Terminal, Low Thermal, Black
Terminal, Low Thermal, Red
Terminal, Low Thermal, Blue
Ferrite 26 x 14 x 11 8680 nF
Cable Assembly Rear Input (8 wires w/ terminals)
5-12 http://www.elso.sk
riešenia na presné meranie
H12
List of Replaceable Parts
Parts Lists
5
2
H8
8 wires with terminals
H9
2
GREEN WHITE BLUE BLACK ORANGE BROWN RED
L1
W1
H9
H10
H11
L1
A1
ORANGE WIRE
F1
FH1
ORANGE WIRE
BLACK WIRE
RED WIRE
H3
12
H4
6
H5
6 H14
6
H2
6
H13
6
J1, J3, J5 Red
J2, J4
J6
Black
Blue
H1
Figure 5-4. Rear Input Assembly (optional)
L1
L1
H6
H7
GREEN WIRE
C1
C2
WHITE WIRE
BLUE WIRE
BROWN WIRE avw030f.eps http://www.elso.sk
5-13
8508A
Service Manual
5-14 riešenia na presné meranie™
Elso Philips Service; tel: +421 32 6582410 email: [email protected]
; web: www.elso.sk
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