3-3
INSTALLATION AND OPERATION INSTRUCTIONS
TEST LEAD CONNECTIONS
An understanding of the function of the three current return terminals (return, ground, guard) on
the tester will allow the operator to properly connect the test leads for a variety of configurations.
The following points should be kept in mind when determining the proper connections for a given
test requirement:
1. Always attach the high voltage test lead to the high side of the test specimen.
2. Any current flowing through the test lead attached to the “Return” terminal on the tester will
always be measured by the “DC Microammeter”.
3. Any current flowing through the test lead attached to the “Guard” terminal on the tester will
never be measured by the “DC Microammeter”.
4. Current flowing through the test lead attached to the “Ground” terminal on the tester will be
measured by the “DC Microammeter” only when the “Ground” jumper is connected to Return.
Ground current associated with the “Ground” terminal will not be measured if the “Ground”
jumper is connected to “Guard”.
5. To use the Guard mode, the specimen must be isolated from Ground. If the low potential side
of the specimen will not or can not be isolated from ground, only the Return mode can be
used (Ground jumper connected to Return).
NEVER OPERATE UNIT WITHOUT THE GROUND JUMPER CONNECTED TO EITHER
RETURN OR GUARD. See diagram at end of Controls and Connections section.
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