Front-Panel Operation
Sample Applications
4
4-55
How Calibrate an 80 Series Digital Multimeter
This example shows the steps necessary to calibrate a Fluke 80 Series DMM.
Note
These procedures are included here as an example. The 80 Series Service
Manual contains the authoritative test and calibration procedures for 80
Series DMMs.
Two procedures are given. The first procedure tests each function and range for
compliance to specifications. The second is the calibration procedure for the 80 Series
meters. The 80 Series Service Manual gives instructions for disassembly and access to
the pca (printed circuit assembly). It will be necessary to access the pca for the calibration
procedure.
Before you connect the Calibrator to the 80 Series DMM, you must know what type of
cables to use and if
should be used. This is given in the “Cables” and “EARTH
Connection” sections of this chapter.
Cables
Fluke 5440A-7002 Low-Thermal Cables are recommended for many calibrations
connections, but they are not necessary for 80 Series calibration. Thermal emf errors that
the Low-Thermal cables will prevent are not important when you calibrate a 3-1/2 digit
meter. The cables work for the subsequent measurements:
•
AC and dc voltages
•
All resistances
•
AC and dc currents to a maximum of 20 A
EARTH Connection
Because the 80 Series DMMs are battery operated, their inputs have no connection to
earth ground. It will be necessary to start with the earth (chassis) ground of the Calibrator
to LO. (Push
so that the indicator is illuminates.)
Verify the Meter
You can use the error mode feature of the Calibrator of the meter (DMM) to make sure
that all ranges of all functions are in specification limits:
1.
Turn on the Calibrator and let it warm up.
Warning
To prevent electrical shock, fire, or personal injury, make sure
the Product is in standby mode before you make connections
between the product and tester.
2.
Make sure that the Calibrator is in standby and connect the DMM as shown in
Figure 4-15.
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