Atec Fluke-792A User Manual
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
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