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SPECIAL NOTE ON TEMPERATURE EFFECTS:
Even the best insulation has a small amount of resistive leakage current. With ageing and deteriorating of
some insulation system (motors, transformers and paper oil insulated cables), this leakage current will
increase, which can aid in assessing the quality and remaining lifetime of the insulation system. In order to
achieve the most consistent results it is important to correct the test object temperature to a standard
temperature, usually (40°C or 68°F). The PM15-4A has the capability to perform this calculation automatically
by entering the test object temperature. The built in printer function allows the operator to document the
results with a date-time stamp showing both the Raw test results without temperature correction as well as
the Corrected final value side by side.
FIGURE 43: HV Waiting Screen – Normal Mode
The HV Waiting Screen (Figure 43) acts as a standby screen, allowing the operator one final chance to
examine the test setup for any discrepancies before activating high voltage. In this screen, the display reads
that the PM15-4A is in Normal Mode. Pressing G on the keypad toggles between Normal Mode and Guard
Mode Configuration (See Figure 44).
FIGURE 44: HV Waiting Screen – Guard Mode
The screen will display the status of the Guard Mode as shown in Figure 44 once G is pressed to toggle out
of Normal Mode and into Guard Mode operation. In addition, if the security circuit is disconnected,
INTERLOCK OPEN will appear at this screen (See Figure 45), disabling the high voltage until the security
circuit is closed.
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