792A AC/DC
Transfer Standard
Support for your most
demanding ac measurement requirements
10 ppm total uncertainty
•
Traceable to national
•
standards
Voltage range 2 mV to 1000V
•
Frequency range: 10 Hz to
•
1 MHz
Fast and easy to use
•
The Fluke 792A is an ultrahigh accuracy AC/DC Thermal
Transfer Standard, designed to
meet the most demanding ac
measurement requirements.
Using the patented Fluke RMS
sensor and thin film range resistors, the 792A offers an extraordinary transfer accuracy, with
total uncertainties of as low as
± 10 ppm (± 5 ppm from the
National Institute of Standards
and Technology — NIST). The
792A also provides a wide voltage range of 2 mV to 1000V,
and a wide frequency range of
10 Hz to 1 MHz.
The Fluke solid-state RMS
sensor also provides the 792A
with remarkable temperature
stability and fast settling time.
Now you can be ready to make
measurements in 30 seconds
instead of 30 minutes. To simplify the transfer process, the
792A’s 2V output permits you
to use a high resolution digital
multimeter rather than a null
meter.
The Fluke 792A is designed
to support the calibration of the
most accurate ac instruments in
your standards lab workload,
including calibrators like the
Fluke 5700A, voltmeters like the
Fluke 8506A and ac measurement standards like the Fluke
5790A.
Accurate, fast and easy
to use
At the heart of the Fluke 792A is
the patented Solid-State Thermal RMS sensor, which has
been proven in a variety of
Fluke products since 1979. Its
output voltage is 2V, compared
to the 7 to 10 mV output of traditional thermocouples. That
means the 792A exhibits excellent signal-to-noise characteristics and minimal reversal errors
as low as 10 ppm relative to
Technical Data
input voltage. The 2V output
also permits you to make measurements with high resolution,
so you can use a digital voltmeter rather than a null meter to
make transfers. Not only are
measurements easier to make,
they are more precise as well.
And, because it is small, the
RMS Sensor has very low thermal mass, so the 792A stabilizes
in as little as 30 seconds and
can be used over a wide temperature range of 11°C to 35°C.
The RMS Sensor is designed
to be rugged and reliable. Each
is built to exacting standards by
the Fluke Microelectronics Operation to maintain quality and
consistency, part after part.
Fully traceable
performance
Each 792A is shipped from
Fluke with documented traceability to the US National Institute of Standards and Technology (NIST). Included is a table
of correction factors and uncertainties for measured ac/dc
differences.
To support the traceability
requirements for an instrument
as accurate as the 792A, the
Fluke Metrology Department
developed a unique system to
transfer NIST values to the 792A
production environment. This
system is based on proven techniques developed to maintain a
732A direct voltage standard to
within a few parts in 100 million.
Statistical treatment of data
resulting from successive
intercomparisons of virtually
identical 792As is used to minimize transfer uncertainties. To
achieve even higher performance, you can have the transfer uncertainties of your 792A
assigned directly by NIST, or
other national standards organizations. For more information,
request the application note
titled Establishing Traceability
for a High Performance AC/DC
Transfer Standard.
Periodic calibration and
recertification is available from
Fluke. This service repeats the
original calibration procedure.
A new table of correction factors
and undertainties for measured
ac/dc differences is returned
with your instrument. Order
792A-000.
The 792A consists of four main components: The Transfer Unit, Power Pack, 1000V Range
Resistor and Transfer Switch.
Each 792A includes a table of correction factors and uncertainties for measured ac/dc differences.
Description
The 792A consists of four units.
The Transfer Unit is the main
analog component of the 792A
for the 20 mV to 220V ranges.
Stainless Steel Type-N connectors assure low signal loss and
high measurement repeatability.
The separate Power Pack unit
permits the Transfer Unit and
1000V Range Resistor to be
shipped independently for
calibration. The 1000V Range
Resistor isolates the heat generated at high voltages outside
the main Transfer Unit. The
Range Resistor has a low temperature coefficient, stabilizes
quickly and exhibits small ac/dc
differences. The Transfer Switch
provides for switching between
the ac and dc inputs.
Each 792A is shipped from
the factory traceable to NIST
standards. Each 792A also
includes a table of correction
factors and uncertainties for
measured ac/dc differences.
2 Fluke Corporation 792A AC/DC Transfer Standard
Performance
specifications
There are three tables of uncertainties included for the 792A.
The first two are absolute and
traceable to the National Institute of Standards and Technology (NIST). Absolute uncertainty
includes time stability, temperature, line and load regulation,
AC/DC Transfer Standard). The
third table, Relative Uncertainty,
includes time stability, temperature, line and load regulation,
but not the traceability to
national or external standards.
These uncertainties apply
when the calibration report,
provided with the 792A, is used
to correct the response of the
transfer standard.
and the traceability provided by
NIST (see Fluke application note
B0205A, Establishing Traceability for a High Performance
Corrected absolute ac/dc uncertainty
1 year, T
AC/DC uncertainty ±ppm input
Voltage Voltage
Range Input 10 Hz 20 Hz 40 Hz 100 Hz 1 kHz 10 kHz 20 kHz 50 kHz 100 kHz 300 kHz 500 kHz 800 kHz 1 MHz
22 mV 2 mV 2200 1600 1600 1600 1600 1600 1600 1600 1900 2500 4500 5000 5000
220 mV 20 mV 350 230 190 190 190 190 190 220 450 650 1000 1100 1100
700 mV 200 mV 220 80 50 50 50 50 50 75 150 220 250 300 300
2.2V 600 mV 200 65 30 25 25 25 25 45 60 120 140 140 140
7V 2V 190 65 30 222222224555120140140140
22V 6V 190 65 30222222224555120125140140
70V 20V 190 65 30252525255570130140140140
220V 60V 190 65 33 33 33 33 33 65 70 130
1000V 200V 190 90 40 33 33 33 33 65 70
±5°C
CAL
Vo ltage Frequency
6 mV 500 400 350 350 350 350 350 500 1000 1500 1800 1800 1800
10 mV 320 280 280 280 280 280 280 300 500 700 1200 1500 1500
20 mV 280 180 140 125 125 125 125 200 450 650 1000 1000 1000
60 mV 230 120 80 60606060120250500600600600
100 m V 210 9 0 50 50 50 50 50 65 150 270 300 350 350
200 mV 200 80 40 30 30 30 30 65 150 220 250 300 300
600 mV 200 70 30 22 22 22 22 45 60 130 140 140 140
1V 190 60 30 15 151515405011512 5 12 5 125
2V 190 60 25 10 101010405011512 5 12 5 125
6V 190 60 25 10 1010104050120125125125
10V 190 6 0 3 0 15 15 15 15 4 0 5 0 12 0 12 5 12 5 12 5
20V 190 60 25 15 1515154050120125125125
60V 190 60 25 20 20 20 20 50 65 130
10 0V 19 0 6 5 3 0 2 02020206070
200V 190 60 27 18 18 18 18 60 70
600V 190 90 35 27 27 30 30 60 70
1000V 190 90 27 25 2527276070
Volt-hertz product: 1x108 @ 100 kHz, 2.2x107 @1 MHz
Waveform requirements: Sinusoidal, distortion less than 1%
792A AC/DC Transfer Standard Fluke Corporation 3
Corrected absolute ac/dc uncertainty
1 year, T
AC/DC uncertainty ±ppm input
Voltage Voltage
Range Input 10 Hz 20 Hz 40 Hz 100 Hz 1 kHz 10 kHz 20 kHz 50 kHz 100 kHz 300 kHz 500 kHz 800 kHz 1 MHz
22 mV 2 mV 2300 1700 1700 1700 1700 1700 1700 1700 2000 2700 5000 5600 5600
220 mV 20 mv 450 250 220 220 220 220 220 280 700 900 1400 1200 1200
700 mV 200 mV 230 90 55 55 55 55 55 83 160 240 270 330 330
2.2V 600 mV 210 65 30 25 25 25 25 45 60 120 140 140 140
7V 2V 200 65 30 222222224555120140160160
22V 6V 200 65 30 222222224555120130170170
70V 20V 200 70 30 252525255570130150150150
220V 60V 200 70 33 33 33 33 33 65 70 130
1000V 200V 200 95 40 33 33 33 33 65 70
±12°C
CAL
Vo ltage Frequency
6 mV 780 430 380 380 380 380 380 500 1200 1700 2100 2400 2400
10 m V 5 00 3 00 300 300 300 300 300 300 600 800 1400 2000 2000
20 mV 400 200 200 180 180 180 180 250 600 800 1200 1300 1300
60 mV 260 130 90 70 70 70 70 130 270 560 660 650 65 0
100 mV 240 100 55 55 55 55 55 72 160 300 330 380 380
200 mV 220 90 45 34 34 34 34 72 160 240 270 330 330
600 mV 210 75 35 26 26 26 26 50 65 130 150 170 170
1V 200 60 30 15 1515154050120130130130
2V 200 60 25 10 1010104050120130130130
6V 200 60 25 10 1010104050120130140140
10V 20 0 6 0 3 0 15 15 15 15 4 0 5 0 120 13 0 150 150
20V 200 60 25 15 1515154050120130150150
60V 200 65 25 20 20 20 20 50 65 130
100V 200 70 30202020206070
200V 200 65 30 18 18 18 18 60 70
600V 200 95 39 27 2730306070
1000V 200 95 30 25 25 27 27 60 70
Volt-hertz product: 1x108 @ 100 kHz, 2.2x107 @ 1 MHz
Waveform requirements: Sinusoidal, distortion less than 1%
Corrected ac/dc uncertainties relative to calibration standards
1 year, T
AC/DC uncertainty ±ppm input
Voltage Voltage
Range Input 10 Hz 20 Hz 40 Hz 100 Hz 1 kHz 10 kHz 20 kHz 50 kHz 100 kHz 300 kHz 500 kHz 800 kHz 1 MHz
22 mV 2 mV 1300 1200 1100 1100 1100 1100 1100 1300 1500 2000 3000 4000 4000
220 mV 20 mV 300 160 150 130 130 130 130 180 400 550 700 800 800
700 mV 200 mV 70 50 25 25 25 25 25 50 50 200 200 275 275
2.2V 600 mV 70 19 10 10 10 10 10 3 0 3 5 7 0 125 13 0 130
7V 2V 70 19 15 15 15 15 15 3 0 3 5 7 0 125 130 130
22V 6V 70 19 15 15 15 15 15 3 0 3 5 70 125 130 130
70V 20V 70 19 15 15 15 15 15 3 0 3 5 7 0 115 115 115
220V 60V 70 19 15 15 15 15 15 30 35 100
1000V 200V 70 19 17 16 16 18 18 30 50
±5°C
CAL
Vo ltage Frequency
6 mV 400 325 275 275 275 275 275 400 750 1000 1300 1500 1500
10 m V 3 00 2 60 2 25 2 25 225 225 225 250 400 650 900 1000 1000
20 mV 250 150 125 125 125 125 125 175 350 500 650 700 700
60 mV 200 50 252525252550250 450 450 500 500
100 mV 150 50 12 1212121250150200 250 300 300
200 mV 80 50 10 10 10 10 10 50 50 200 200 275 275
600 mV 70 19 7 7 7 773035 70 125 130 130
1V 70 19 77777303570100100100
2V 70 19 7667730357010100100
6V 70 19 76677303570100100100
10V 70 19 77777303570100100100
20V 70 19 7 7 7 773035 70 100 100 100
60V 70 19 77777303570
100V 70 19 7 7 7 773050
200V 70 19 7 7 7 7 7 30 50
600V 100 35 17 16 1618183050
1000V 100 35 10 10 10 10 10 30 50
Volt-hertz product: 1 x 108 @ 100 kHz, 2.2 x 107 @ 1 MHz
Waveform requirements: Sinusoidal, distortion less than 1%.
792A AC/ DC Transfer Standard Fluke Corporation 4
Settling time
Voltage Settling
Range Time
22 mV 60 sec
220 mV 60 sec
700 mV 60 sec
2.2V 30 sec
7V 30 sec
22V 30 sec
70V 30 sec
220V 30 sec
1000V 30 sec
Note: For amplitude changes of less than
10%, settling times are typically 20% of
those indicated in the table above.
Ouput characteristics
Impedance: <30 milliohms.
Current: up to 20 mA drive
capability
Protection: Protected against
damage due to high voltage up
to 200 volts, provided the peak
current does not exceed 50 mA.
May be shorted indefinitely without damage to the instrument.
Tolerance: The output voltage
is approximately 2 volts at full
scale of any range with the
following tolerances:
DC reversal error
The following table of errors is relative to the input voltage and
applies over each entire range.
Voltage Range Input Voltage Maximum Reversal Error
22 mV 2.2-22 mV 90 µV
220 mV 22-220 mV 90 µV
700 mV 220-700 mV 90 µV
2.2V 0.7-2.2V 10 ppm
7V 2.2V-7V 10 ppm
22V 7-22V 10 ppm
70V 22-70V 10 ppm
220V 70-220V 10 ppm
1000V 220-1000V 10 ppm
Input impedance
Input Impedance
Voltage Range Resistance Shunt Capacitance
22 mV 10 MΩ <40 pF
220 mV 10 MΩ <40 pF
700 mV 10 MΩ <40 pF
2.2V 420Ω <20 pF
7V 1.2 kΩ <20 pF
22V 4.0 kΩ <20 pF
70V 12 kΩ <20 pF
220V 40 kΩ <20 pF
1000V 200.4 kΩ <20 pF
Voltage
Range Tolerance
22 mV 5% + 5.3 mV
220 mV 5% + 760 µV
700 mV 5% + 500 µV
2.2V 10% + 300 µV
7V 10% + 300 µV
22V 10% + 300 µV
70V 10% + 300 µV
220V 10% + 300 µV
1000V 10% + 300 µV
Battery characteristics
The following characteristics
are typical and apply at 23°C.
Four, 6 volt lead-acid, sealed,
gelled electrolyte batteries are
used.
Battery life: 22 mV to 700 mV
ranges, 24 hours; 2.2V to 1000V
ranges, 72 hours
Battery charge time: 16 hours
to full charge
Low battery life: 22 mV to
700 mV ranges, 30 minutes;
2.2V to 1000V ranges,
60 minutes
Maximum input voltage
The following table lists both the maximum operational and the
non-destructive rms voltages.
Maximum Input Voltage
Voltage Range Operational Non-Destructive
22 mV 22 mV 3V
220 mV 220 mV 3V
700 mV 700 mV 3V
2.2V 2.2V 50V
7V 7V 50V
22V 22V 50V
70V 70V 130V
220V 220V 250V
1000V 1000V 1000V
792A AC/DC Transfer Standard Fluke Corporation 5
General
specifications
Temperature stabilization:
Allow 12 hours stabilization
time in the environment of use.
Warm-up time: 15 minutes
with power on, after stabilization time
Temperature performance
Operating: 11 °C to 35°C
Calibration: 18°C to 28°C
Storage: -40°C to 50°C
Relative humidity
Operating: <75% to 30°C,
<70% to 35°C
Storage: <95%, non-condensing
Altitude
Operating: to 3,050m (10,000 ft)
Non-operating: to 12,200m
(40,000 ft)
Safety: Designed to comply with
UL1244(1987); IEC 348-1978;
IEC 66E(CO)4; and SCA556B
Input low isolation: 20V to
chassis
Guard isolation: 10V to input
LO or chassis
EMI/RFI: Designed to comply
with FCC Rules Part 15, Subpart
J, Class B; VDE 0871, Class B;
VDE 0875, Class K
Reliability: {MIL-STD-28800D,
para 3.13.3}
Line power: 50 to 60 Hz ± 5%
allowed about selectable nominal line voltages: 100V, 120V,
220V, 240V ± 10%
Maximum power: 45 VA
Size
Transfer unit:
Height 17.8 cm (7 in), plus
1.5 cm (0.6 in) for feet;
Width 21.6 cm (8.5 in);
Depth 30.5 cm (12 in)
Power pack:
Height 17.8 cm (7 in), plus
1.5 cm (0.6 in) for feet;
Width 21.6 cm (8.5 in);
Depth 30.5 cm (12 in)
1000V range resistor:
Height 7.6 cm (3 in);
Width 8.9 cm (3.5 in);
Depth 14.0 cm (5.5 in)
Transfer switch:
Height 7.6 cm (3 in);
Width 8.9 cm (3.5 in);
Depth 14.0 cm (5.5 in)
Weight
Transfer unit: 8.4 kg (18.5 lbs)
Power pack: 8.9 kg (19.5 lbs)
1000V range resistor: 1.6 kg
(3.5 lbs)
Transfer switch: 1.6 k g (3.5 lbs)
Ordering
Information
Model
792A AC/DC Transfer Standard,
Includes Transfer Unit,
Power Pack, 1000V Range
Resistor, Transfer Switch
and a Report of Calibration
that provides traceability
to the National Institute of
Standards and Technology
Accessories
792A-7001 Power Pack
792A-7002 100V Range Resistor
792A-7003 Transfer Switch
792A-7004 A40 Current Shunt
Adapter
Calibration
792A-000 Calibration to original
specifications
Fluke. Keeping your world
up and running.
Fluke Corporation
PO Box 9090, Everett, WA USA 98206
Fluke Europe B.V.
PO Box 1186, 5602 BD
Eindhoven, The Netherlands
For more information call:
U.S.A. (800) 443-5853 or
Fax (425) 356-5116
Europe/M-East/Africa (31 40) 2 678 200 or
Fax (31 40) 2 678 222
Canada 1-800-36-FLUKE or
Fax (905) 890-6866
Other countries (425) 356-5500 or
Fax (425) 356-5116
Web access: http://www.fluke.com
©1999 Fluke Corporation. All rights reserved.
Printed in U.S.A. 6/99 1260093 D-ENG-N Rev D
Printed on recycled paper.
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