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If the first step selected is a Ground Bond test, the display will show:
GND Set XXX.X s
M25-1 XX.XX A XXX m
GND Set : Ground Bond test setting screen
XXX.X s : Dwell Time setting
MXX : Memory Program number
-X : Test Step number
XX.XX A : AC Output Current setting
XX.XX m : High-Limit of Ground Continuity Resistance
5.4. Ground Continuity Test (7700 only)
If you are performing a Ground Continuity Check, the Ground Continuity must be set to
the ON (Enabled) position. The ground check cable must be connected properly to the
chassis of the DUT. The display will indicate “Ready” before activating the TEST
button. Otherwise, the instrument will signal a continuity failure when the TEST button
is activated. When continuity is ON and continuity is Good the display will show:
ACW Ready XXX.X s
M25-1 X.XX KV XX.XX mA
If you are not performing a Ground Continuity Check the Ground Continuity must be set
to the OFF (Disabled) position. It is not necessary to connect the Cont. Check cable since
this test will not be performed if the circuit is disabled. The instrument will proceed with
the Hipot Test when the TEST button is activated.
Press the TEST button to activate the test process or press the MEMORY key to recall
the new Test Parameters for testing.
5.5. Smart GFI (Ground Fault Interrupt)
The High Voltage power supply of the instrument is internally referenced to earth
ground. The leakage current measuring circuits monitor only currents that flow through
the Return lead. Therefore, the possibility exists for current to flow directly from the
High Voltage output to earth ground that typically would not be monitored.
GFI is a circuit that monitors the current between the High Voltage output and earth
ground. The GFI's main purpose is to protect the operator from prolonged exposure to
High Voltage in the case of an accidental contact with the High Voltage lead and earth
ground. If the operator accidentally touches the High Voltage lead and earth ground, the
High Voltage will be shut off immediately and the test aborted. If the GFI threshold is
exceeded, the display will indicate a GND Fault.
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