Fluke Calibration 5730A, Operator'S Manual, Page: 27 / 260

Introduction and Specifications
The Components of the Calibrator
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The Components of the Calibrator
The 5730A Calibrator is configured internally as an automated calibration system, with
process controls and consistent procedures. Internal microprocessors control all functions
and monitor performance with the use of a switching matrix to route signals between
modules. Complete automatic internal diagnostics, both analog and digital, confirm
operational integrity.
Reference amplifiers maintain dc accuracy and stability. Reference amplifiers have the
lowest noise and best stability. Reference amplifiers in the Calibrator go through special
selection processes that include long-term aging to ensure high reliability and
performance well within specifications.
The Calibrator achieves its exceptional ac voltage accuracy by the use of a patented Fluke
Calibration rms sensor to make real-time ac/dc comparison measurements. The Fluke
Calibration rms sensor is similar in principle to the traditional thermal voltage converter,
but has a shorter time constant, virtually no reversal error, higher signal-to-noise ratio,
and better frequency response. In the Calibrator, one Fluke Calibration rms sensor serves
as an ac/dc or ac/ac transfer standard to develop gain and flatness correction constants
during calibration. The second Fluke Calibration rms sensor continuously monitors and
corrects output voltage during operation.
A patented 26-bit digital-to-analog converter (DAC) lets the Calibrator precisely vary its
output. This is a pulse-width-modulated DAC with linearity typically better than 0.2 ppm
of full scale. As with the other internal functions, the linearity of the DAC is
automatically checked during calibration and analog diagnostics.
Specifications
The 5730A Calibrator is verified and calibrated at the factory prior to shipment to ensure
it meets the accuracy standards necessary for all certified calibration laboratories. By
calibrating to the specifications in this chapter, the high-performance level can be
maintained throughout the life of the Calibrator.
Specifications are valid after a warm-up period of twice the time the Calibrator has been
turned off, up to a maximum of 30 minutes. For example, if the Calibrator has been turned off
for five minutes, the warm-up period is 10 minutes.
Specification Confidence Levels
5730A Calibrator performance level is ensured by regular calibration to the primary
performance specifications. These specifications are provided at both the 99 % and 95 %
confidence levels. Calibration at the 99 % confidence level is guaranteed by calibration at
Fluke Calibration and Fluke Calibration Service Centers. For information on selecting the
confidence level, refer to Chapter 4.
The tables in this chapter provide specifications at both the 95 % and 99 % confidence
levels for the Calibrators. Included with these tables are operating specifications for use
of the Calibrator with the Wideband AC Module (Option 5700A-03) and the 5725A and
52120A Amplifiers.