Atec Fluke-792A - Manual

Technical Data
792A AC/DC
Transfer Standard
Support for your most
demanding ac measure-
ment 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 ultra-
high 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 resis-
tors, the 792A offers an extraor-
dinary 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 volt-
age 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 sim-
plify 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 measure-
ment standards like the Fluke
5790A.
Accurate, fast and easy
to use
At the heart of the Fluke 792A is
the patented Solid-State Ther-
mal 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 tra-
ditional thermocouples. That
means the 792A exhibits excel-
lent signal-to-noise characteris-
tics and minimal reversal errors
as low as 10 ppm relative to
input voltage. The 2V output
also permits you to make mea-
surements with high resolution,
so you can use a digital voltme-
ter 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 ther-
mal mass, so the 792A stabilizes
in as little as 30 seconds and
can be used over a wide tem-
perature range of 11°C to 35°C.
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.
Fluke. Keeping your world
up and running.
General
specifications
Temperature stabilization:
Allow 12 hours stabilization
time in the environment of use.
Warm-up time: 15 minutes
with power on, after stabiliza-
tion 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 nomi-
nal 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 kg (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
792A AC/DC Transfer Standard Fluke Corporation 5
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 with-
out damage to the instrument.
Tolerance: The output voltage
is approximately 2 volts at full
scale of any range with the
following tolerances:
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
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
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