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5700A/5720A Series II Calibrator
Service Manual
1-6
1-7. Auxiliary Amplifiers
The Fluke Model 5725A Amplifier is available to extend the high voltage performance
and current range of the calibrator:
Interface connectors on the calibrator’s rear panel accept cables to directly operate a
5725A. Three amplifiers can be connected to the calibrator at the same time, but only
one output can be active at a time. Once you have connected the amplifiers and
configured the calibrator in a setup menu, amplifier operation is controlled by the
calibrator.
Chapter 4 provides instructions for operating the 5725A. The general specifications at
the end of this chapter include specifications for operating the calibrator with the 5725A.
For other amplifier specifications, refer to their instruction manuals. Table 1-1
summarizes the extended capabilities offered by the 5725A. Brief descriptions of the
extended capabilities follow.
Table 1-1. Auxiliary Amplifier Data
Model Mode Range
5725A Amplifier AC V 220 to 1100V rms up to 70 mA, 40 Hz to 30 kHz
(50 mA < 5 kHz)
220 to 750V rms up to 70 mA, 30 kHz to 100 kHz
DC Amps 0 to ±11A
AC Amps 1 to 11A rms, 40 Hz to 10 kHz
1-8. 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 1100V ac range with no
compromise in accuracy:
• Frequency limits at higher voltage increase to 100 kHz at 750V, 30 kHz at 1100V.
• Load limit increases to 70 mA for frequencies above 5 kHz.
• Capacitive drive increases to 1000 pF, subject to the maximum output current.
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.
1-9. 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