Fluke 5700A Series User Manual

Introduction and Specifications
Developing a Performance History 1
1-11
is similar to calibration, except internal check standards are used as primary references
(no external standards are needed), and changes cannot be stored. The process produces a
report similar to normal calibration, showing drift relative to internal check standards.
Because cal check does not change stored calibration constants, there is no need to enable
the rear panel CALIBRATION switch. Therefore, an external computer can do the
procedure unattended.
1-21. Developing a Performance History
A Fluke specification is a set of performance limits that all products must meet. To
maintain consistent quality, Fluke calibrators are specified with enough margin to include
temperature, line, and load extremes, plus additional margin for production. This means
that a typical 5700A/5720A Series II calibrator in a typical environment operates inside
50% of specification limits. For some exacting applications, it can be helpful to know just
how accurately a particular calibrator operates. The proper way to do this is to
accumulate a performance history by calibrating regularly and recording results on a
control chart.
Calibrating regularly and recording the results on a control chart is tedious and requires a
large array of equipment. The calibrator’s calibration check feature is an alternative with
some distinct advantages:
• Calibrated check standards are already programmed into the unit. You do not have to
use external standards.
• The process is consistent and automatic: it does not require an operator’s assistance.
Each calibration check produces a new set of data points for accumulating a historical
record. When this process is externally automated, significant history can be accumulated
much faster than with a manual calibration.
1-22. Range Calibration
After calibration, you can make further fine adjustments to each range. Range
adjustments are optional; they are not necessary to meet total uncertainty specifications.
However, they do allow you to align your calibrator closer to your standards.
Before you do range calibration, you must first use the calibrator’s semi-automated
calibration procedure. This is to calibrate the ranges that will not be adjusted. It also
performs an initial adjustment for each range, and supplies flatness corrections for ac
functions.
1-23. DC Zeros Calibration
To ensure the validity of the specifications, a dc zeros calibration must be performed at
least every 30 days. If more than 30 days elapse without a dc zeros calibraiton a warning
message appears. This procedure does not require any external equipment or connections
and takes approximately 2.5 minutes to complete.
1-24. Specifications
The 5700A/5720A Series II calibrators are verified and calibrated at the factory prior to
shipment to ensure they meet the accuracy standards required for all certified calibration
laboratories. By calibrating to the specifications in this chapter, you can maintain the high
performance level throughout the life of your calibrator.

Fluke 5700A Series Specifications

General

Type	Multifunction Calibrator
Operating Temperature	0°C to 50°C
Storage Temperature	-40°C to 70°C
Humidity	10% to 90% non-condensing
Frequency Range	10 Hz to 1 MHz
Accuracy	Varies by function and range. See manufacturer's specifications for details.
Output Stability	Varies by function and range. See manufacturer's specifications for details.
Power Requirements	50 Hz to 60 Hz