Fluke 8920A Datasheet
 8920A/8921A/8922A
/ Electronics
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Choice of Bandwidth
Bandwidth capabilities of the 8920-Series Voltmeters encompass many
applications, from testing high-frequency oscillators, attenuator flatness
and amplifier frequency response to microphone levels, phono-pickup
devices, vibration tests and wideband noise levels — to list only a few.
Models 8920A and 8921A cover a bandwidth of 10 Hz to 20 MHz. The
8922 A offers low-frequency capabilities in the 2 Hz to 11 MHz bandwidth
and a switchable 200 kHz low pass filter which eliminates unwanted
high-frequency noise from the measured signal.
True RMS Converter
The heart of all 8920-Series Voltmeters is Fluke's monolithic thermal
converter which can measure rms values of an ac signal. This patented
semiconductor circuit balances the heating power of a dc feedback signal
against the heating power of the ac input voltage, producing a true rms
equivalent dc output. This unique converter enables Fluke voltmeters to
provide wideband, low-noise, accurate measurements at a low cost.
Selectable dBm Reference Impedance
Fluke's 8920-Series Voltmeters permit an operator to select any one of
12 reference impedances from 500 to 12000) and to digitally read out dB
values referenced to the selected level. Input impedance is constant at 10
MO for all settings of the dB reference control. This minimizes circuit
loading and allows the operator to add the appropriate termination
externally. Zero dB corresponds to 1 mW for each of the selectable levels.
AC or AG + DC Functions
The input coupling capabilities of the 8920-Series Voltmeters help solve
difficult measurement problems. Without these features, whenever an
operator is required to measure a signal which (1) is not symmetrical, (2)
has unequal excursions above and below zero, or (3) has a dc component,
it is necessary to go through a series of computations to determine the
actual rms voltage value. First, the signal has to be measured with a dc
voltmeter (providing its ac rejection is sufficient) and then with an ac
voltmeter. Finally, the sum of the squares of the two readings must be
calculated and the square-root extracted from the result. Failure to
consider the de component by using only an ac-coupled meter can result in
substantial error.
Relative dB Measurements
The relative reference feature of the 8920-Series Voltmeters allows
direct readings of gain or attenuation. Depressing the REL switch sets the
existing dB reading to zero, establishing the input voltage level as the
relative dB reference. Subsequent readings of higher voltages will be
displayed as +dB, lower voltages as —dB.
Autoranging
Fluke's autoranging feature allows you to carry out your testing without
having to change ranges manually. A range can be placed on HOLD or
manually stepped up to a higher range. On HOLD, the meter will remain in
a given range regardless of changes in input levels. On STEP UP, the meter
will increase ranges step-by-step until the switch is released.
Peaking/ Dipping Meter
In addition to an accurate digital display, all Fluke Voltmeters in the
8970-Series feature an analog meter for peak and null voltage adjust-
ments. The meter indicates 0 to 100 percent full scale In gach range.
27
8920A/8921A/8922A
Linear Analog Dutput
Models 8920A and 8922A are equipped with a rear panel output for
driving X-Y or strip chart recorders, delivering voltages proportional to the
display count. A 2-volt level equals 2000 counts, a 1-volt level equals
1000 counts, etc. This feature is not available on Mode! 8921A.
Accuracy
Fluke Digital Voltmeters avoid the possibilities for error so common in
analog meters. The digital displays eliminate the likelihood of misreading
the meter due to viewing angle problems of parallax common with analog
meters. Also, the accuracy of 8920-Series Voltmeters is specified as a
percent of reading rather than as percent of full scale.
Percent of reading accuracy does not degrade for measurements at the
low end of a scale. Front pane! switching offers a choice of readings in dB
or volts.
The accuracy specifications below apply from 9% to 100% of full scale
and from 18°C to 28°C for 90 days. For six-month specifications multiply
figures by 1.5.
AC Accuracy: + % of voltage reading or £dB (8920A/8921A)
Range 2Hz 10Hz 20 Н2 50Hz “10 kHz 200kHz 1mMHz 2MHz 10 MHz 20 MHz
1 À 1 i
700V
200V Not Specified
20V 1% or 0.5% or 0.7% or
ov 0.15 dB 0.1 dB 0.15 dB 3% or 0.35 dB
200 mv Not 5% or 5% or
20 mv pecified} 0.5 dB 2% or 1% or 2% or 0.5 dB
0.25 dB 0.15 dB 0.25 dea | 4% or
2 my 3% or 2% or 3% or 0.4 dB
0.35 dB 0.25 dB 0.35 dB
AC Ассигасу: + % of voltage reading or +dB (8922A)
Range 2 Hz 10 Hz 20 Hz $50 Hz 10 kHz 200kHz 1MHz 2MHz 11 MHz
FILTER IN | FILTER OUT
700 Y 1% or
Not Specified
200V 0.15 d8 | 1% or 0.5% or 0.7% or
20V 3% or | 5% or |0-15 dB 0.1 de 0.15 dB [ yo, or
500 my | 0:35 dB | 0.5 d8 0.35 dB
2% or*
20 mV 0.25 dB 2% or 1% or 2% or 5% or
5% or | 0-25 dB 0.15 dB (0.25 dB 0.5 dB
0.5 dB
5% or* | 5% or | 3% or | 2% or
2mV | 0.5dB | 0.5 de [0.35 dB | 0.25 dB 4% or 0.4 dB
* Valid when AC + DC DAMPING is selected and input has no dc
components.
** Below 2 mV add number of digits (N) to 25% voltage readings, where N
= 5 + mV input. Or, for dB readings, add N to £0.5 dB, where N= 0.5
+ (mV input)?
АС--ОС Accuracy: Add to AC accuracy specifications (above) £10 digits or
+0.5 dB above 2 mV, or +100 digits or 5.0 dB below 2 mV. For dc only,
add above digits to 50 Hz to 10 kHz specifications ‘
Funetions: True RMS measurements only. AC or AG + DC (8920A and
8921A); AC or AC + DC with damping (8922A)
Maximum Input: 700V rms or 1000V peak, not to exceed a volt-hertz product
of 1 x 108 on any range
Maximum Common Mode Voltage
89204 and 89224: 400 mV rms or 600 mV peak
89214: 500V rms or 700V peak
AC Common Mode Rejection: >60 dB at 50 and 60 Hz with 1000 unbalance
DC Common Mode Rejection: =100 dB, 1000) unbalance
28
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Crest Factor: 7 at full scale, increasing down scale by 7 times the voltage
range divided by the voltage input. Degrades below 10 Hz, annunciated
when capability exceeded (8922A only)
Input Impedance: 10 MQ) shunted by <30 pF
Voltage Ranges: 2 mV, 20 mV, 200 mV, 2V, 20V, 200V, 700V
Ranging: Autoranging with HOLD to defeat autoranging and STEP UP for
manual ranging. Ranges up at 2000 counts and ranges down at 180 counts
Decibel Ranges: In the autorange mode, the instrument appears as though it
has a single range spanning 131 dB
dBm Reference: Twelve user-selectable impedances are provided to
reference a 0 dBm, 1 mW level (500, 750, 930, 1100, 1240, 1350,
1500, 3000, 6000, 9000, 10000, and 12000) (dBYV = 10000)
Relative dB Reference: A voltage input present when this button is pushed is
held as “0 dB" reference point. Subsequent readings indicate +deviations
from this point
Voltage Resolution: 0.05% of ranges (3% digits)
Decibel Resolution: 0.01 dB (4% digits)
Typical-3 dB Paints: 40 MHz on 20 mV thru 20V ranges and 4 MHz on 2 mV
range {8920A/8921A); 22 MHz on 2 mV to 20V ranges (8922A)
Low Pass Filter: Approximately 200 kHz -3 dB point, on 8922A only
Reading Rate: 2.5/s or 1/s with ac + dc with damping (8922A)
Autorange Rate: <950 ms or <3.5s with ac + dc with damping (8922A)
Response Time: (To rated accuracy) <1.6s or <7s with ac + de with
damping (8922A)
Readout: Panel-selectable for volts or dB, automatic decimal point location:
analog peaking/dipping meter
LED Annunciators: Indicate “mV,” “V,” “dB,” “REL REF,” and "2 MHz MAX"
for 2 mV range (8920A and 8921A) and “UNCAL” when crest factor
limitation exceeded (8922A)
Overrange: Flashes maximum reading for that range
Underrange: Flashes decimal
Linear Analog Output: (8920A and 8922A only) Linear output of 2000 mV dc
for a 2000-count readout; +1.0% relative to display; essentially 02
output into a >10 kQ load; non-isolated, with output common same as
input common
Option Specifications
Counter Output Option (-03)
Drives frequency counters. Converts input signal into a 100 mV peak
square wave. Greater dynamic range extends the sensitivity of counters to
180 uV at the low end and 700V at the high end. Impedance is 50Q. Used
with the 8921A, counter can measure signals elevated to 500V rms.
Logarithmic Analog Output Gption {-04)
or 8920A and 8922A only. Provides an analog output voltage propor-
tioned to the logarithm of the input voltage. Plots logarithmically-scaled
graphs, dB variations. Zero volts and zero dB on the output correspond
with 200 uV on input. A 13.1V output corresponds to 700V or 131 dB on
the input. Therefore, 2V on the output equals 20 dB, 6V equals 60 dB, etc.,
making it easy to relate voltage to dB. The option provides a low-cost way
of using an X-Y recorder to plot graphs as one continuous curve over any
part of the 131 dB range.
PTI Interface Option (-921)
To use the 8920-Series DVM's with Fluke's own addressable Portable
Test Instrument (PT!) byte-serial data bus. Output to Fluke printers,
typically. Supplied with 2-foot ribbon cable Y7203.
1120A Interface Option (-522)
A “personality card” that fits in the Fluke 1120A IEEE-488 Translator.
IEEC-488 Interface Option (-529)
The 8920-Series Voltmeters can be made compatible with IEEE Std
488-1978 by using Option -529 in combination with the Fluke Model
1120A Translator. A single 1120A will interface three Fluke instruments
to the bus. Option -529 is electrically equivalent to Option -521 plus
Option -522. Supports subsets SH1, AH1, T3, TE3
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General Specifications
Temperature: -40% to +75%, non-operating
Relative Humidity: <<80%
Shock: MIL-T-28800 all classes
Vibration: MIL-T-28800, classes 2, 3 & 4
MTBF: >10,000 hours
Power: 100V, 120V, 220V ac 10% or 240V ac +4%, -10%, selected by
internal switches, 50 to 400 Hz, 10W max
Size; 32.6 cmL x20.3cmWx10.5cmH (12.9inL x8.0inWx4.3inH)
Weight: 2.47 kg (5.44 Ib)
Included: Manual, power cord, serialized and dated calibration certificate
Models February 1987 prices
8920A DVM, BNC Input, 10 Hz-20 MHZ ................. $1615
8921A DVM, Banana Jack Input, 10 Hz-20 MHz ........... 1615
8922A DVM, BNC Input, 2 H7-11 MHZ ..............e.—.. 1615
Options
892XA-03 Counter Output ..............eee...ecereroo 220
892XA-04* Logarithmic Output (not for 8921A) ........... 220
892XA-521 PTI Interface ...........ee_eecoreverocareo. 190
892XA-521K PTI Interface, field-installable ............... 220
BXXXA-522K 1120A Interface, field-installable ............ 135
892XA-529** IEEE-488 Interface ...... eee 275
* Not compatible with -521, -521K, -529
* The -529 Option can be ordered and installed at time of manufacture only.
For existing instruments which do not have -529 Option installed, an IEEE
Interface can be added by ordering -521K and -522K (1120A required).
Accessories (Also see page 63)
1120A |EEE-488 Translator ...........eeeceesarerere. 550
Y7203 2 ft PTI Ribbon Cable .............. ccc voit. 50
Y7204 5 ft PTI Ribbon Cable ..............eeerrevevo. 65
Y2014 51” Rack Adapter, Single ...................... 90
Y2015 51" Rack Adapter, Dual ...........e.eesesesrev. 90
Y2020 Panel Mount Kit ..........__eeerreveoreroceroo 90
Y2024 3-Module Power Cord ............... Pesvecroo. 20
A90 6-Range Current Shunt ........e._..encrreorecoveo 620
80J-10 10 Amp Current Shunt .................. uen 30
Y9100 BNC 50Q Attenuator (6 dB) ...........e.eeem... 55
Y9101 BNC 500 Attenuator (14 dB) ..........e._erem... 55
Y9102 BNC 500 Attenuator (20 dB) ....... Cee 55
Y9103 50 Ohm Feedthrough Terminator .......... Lace ne 35
Y9107 BNC "T" LL. Le ea aa ee ae ae eee a aa aa ane ne» 15
Y9109 Banana to BNC Adapter PS 20
Y9111 3-foot BNC to BNC Cable ......... Le ee sea 00 0 20
Y9112 6-foot BNC to BNC Cable ................. co... 20
Also see page 284 for more accessory information,
0920A/8921A/6922A
Service E Support
Warranty
One-year extended warranty. Calibration warranted during calibration
cycle. (See page 269 for further information on warranty and calibration.)
Extended Warranty
SC1-8920A Repair (with calibration) .................... 180
SC1-8920A Repair (calibrated w/incoming or outgoing data) .. 215
561-8920A Repair (calibrated w/incoming & outgoing data) .. 250
SC2-8920A Calibration (4/year recommended) ............. 252
SC2-8920A Calibration (4/yr w/incoming or outgoing data) ... 392
SC2-8920A Calibration (4/yr w/incoming & outgoing data) ... 1532
SG1-8921A Repair (with calibration) .................... 180
SG1-8921A Repair (calibrated w/incoming or outgoing data) .. 215
SC1-8921A Repair (calibrated w/incoming & outgoing data) .. 250
SC2-8921A Calibration (4/year recommended) ............. 252
SC2-8921A Calibration (4/yr w/incoming or outgoing data) ... 392
SC2-8921A Calibration (4/yr w/incoming & outgoing data) ... 1532
SC1-8922A Repair (with calibration) .................... 193
SC1-8922A Repair (calibrated w/incoming or outgoing data) .. 228
SC1-8922A Repair (calibrated w/incoming & outgoing data) .. 263
SC2-8922A Calibration (4/year recommended) ............. 252
SC2-8922A Calibration (4/yr w/incoming or outgoing data) ... 392
SC2-8922A Calibration (4/yr w/incoming & outgoing data) ... 532
Spare Parts
Recommended spare parts kit is available. Contact Replacement Parts
Dept. at (800) 526-4731 in most of U.S.A., (206) 356-5774 from WA for
more details.
Ordering Information (See page 306)
29
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