Calibration Verification
4-26 72A-1230 Rev. F
July 22, 2005
If none of the above applies and all statuses are ENABLED the problem is
likely to be the inability to successfully complete a Calibration
Verification test. Run the diagnostic and the results should indicate the
problem.
NOTE If the corrective procedures described do not fix the System Status error
then Call Doble.
Calibration Verification
NOTE For a simple check of the M4000 Insulation Analyzer's measurement
system, test the empty Doble Liquid Insulation Cell, energized at 5 kV.
See ”Checking Instrument Accuracy in the Field” on page 4-43.
A more comprehensive check can easily be performed in the form of the
Calibration Verification. It is suggested that a Calibration Verification be
performed (providing the optional M4150 or M4151 Calibration Reference is
available):
• Upon receipt of an M4000 Insulation Analyzer from Doble or from
another location within your company
• At monthly intervals
• When questionable readings are obtained
The Calibration Verification provides the quickest assurance that the
measurement system and the test leads are working correctly. It exercises the
red and blue resistors, the guard connection of the high voltage lead, and tests
GST internal loss.
NOTE Do not run this test when the temperature is below freezing.
Prior to performing a Calibration Verification, run the System Status
diagnostic (page 4-23) to ensure that all system variables are enabled.
The figures in the example below reflect the use of the M4150 Calibration
Reference.
To perform the Calibration Verification:
1. Select Calibration Verification from the Diagnostics pull-down menu.
The screen shown in Figure 4.4 appears.
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