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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
GFI Fail.
Smart GFI allows the user to automatically configure the instruments return configuration.
When the Return lead is earth grounded, the GFI circuit is disabled and the instrument operates
in a grounded return mode of operation. Grounded Return allows the user to perform tests on
devices that have their chassis earth grounded by the test fixture or test environment. The
standard configuration of Hypot III is a floating return connection that is not directly connected
to Earth ground. The standard configuration allows monitoring of very low level leakage
current without internal or external stray earth ground leakage currents being measured and
thereby causing errors in the reading. Grounding the return will create some amount of
leakage current that is proportional to the High Voltage output and can cause small amounts of
error depending on the test voltage and physical environment.
Cal Alert (Calibration Alert)
Calibration Alert is a feature that allows the instrument to give an advanced alert that the
calibration for the instrument is coming due. Scroll the cursor to the Cal Alert parameter using
the directional soft keys. When the cursor is pointing to the Cal Alert parameter, you may turn
the function ON and OFF by pressing the “+” soft key.
Turning this parameter “ON” will activate the Cal Alert function and when the date matches
the Alert Date, the instrument will display the Calibration Alert warning screen upon power up.
If the “Show this screen again?” function has been turned “OFF” at the Calibration Alert
Warning screen, this parameter will automatically be set to “OFF”.
Cal Date(Calibration Date)
Calibration Date is a non-editable parameter that indicates the Date when calibration was last
performed on the instrument. This parameter automatically updates after calibrating the
instrument.
Cal Due (Calibration Due Date)
It is recommended that calibration should be performed at least once a year. It is
recommended that the Calibration Due date not bet set greater than one year from the
Calibration Date displayed. After a calibration is performed, the Calibration Due Date is
automatically set 1 year after the calibration date.
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