5725A Amplifier; Support Equipment And Services; Direct Voltage Reference Standard - Fluke 5700A Series II Operator's Manual

5700A/5720A Series II
Operators Manual
Model

5725A Amplifier

1-7.

5725A Amplifier

The Fluke 5725A Amplifier is an external unit operating under calibrator control to
extend ac voltage drive capabilities and both ac and dc current output range. The
amplifier adds the following capabilities to the calibrator's 1100 V AC range with no
compromise in accuracy:
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•
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Extended-performance voltage is available at the calibrator's front or rear binding posts,
eliminating the need to change cables during a procedure.
A separate set of binding posts on the front panel of the 5725A supplies extended-range
ac and dc current outputs. Since most meters have a separate input terminal for the high
current ranges, this eliminates the need to change cables during a procedure. The 5725A
can also be configured to source all current (both standard calibrator-generated current
and its own current) through the 5725A binding posts.

1-8. Support Equipment and Services

Fluke supports your calibration needs with precision, high-quality equipment and a wide
range of services. Depending on your needs, location, and capabilities, you may decide to
support your 5700A/5720A Series II Calibrator independently or use Fluke services for
part, or all, of your support needs. The following paragraphs describe the support
equipment and services offered by Fluke for the calibrator. For specifications and
ordering instructions for this support equipment and other Fluke instruments, refer to the
Fluke catalog, or contact a representative at a Fluke Sales and Service Center.
1-9. 732B Direct Voltage Reference Standard
The Fluke 732B is a rugged, easily transported solid state direct voltage reference
standard with a highly predictable 10 V output. This predictability allows the Fluke
Standards Laboratory, as well as many Fluke customers, to completely eliminate fragile,
saturated standard cells. Laboratories still maintain standard cells using the 732A and
732B as a transportable voltage standard, eliminating the need to transport their standard
cells. The 732B can be short-circuited, even for extended periods of time, without
damage or loss of stability. It maintains full specified stability over a temperature span of
18 to 28 °C.
The calibrator uses a 10 V reference standard such as the Fluke 732B in its semi-
automated calibration procedure to establish external voltage traceability. Chapter 7
describes this procedure.
1-6
Table 1-1. Auxiliary Amplifier Data
Mode
AC V
Amps
DC
Amps
DC
Frequency limits at higher voltage increase to 100 kHz at 750 V, 30 kHz at 1100 V.
Load limit increases to 70 mA for frequencies above 5 kHz.
Capacitive drive increases to 1000 pF, subject to the maximum output current.
Range
20 to 1100 V rms up to 70 mA, 40 Hz to 30 kHz
(50 mA < 5 kHz)
220 to 750 V rms up to 70 mA, 30 kHz to 100 kHz
0 to ±11 A
1 to 11 A rms, 40 Hz to 10 kHz