Associated Research HYPOTULTRA III 7620, Operation And Service Manual, Page: 49 / 148

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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 HypotULTRA 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.
4.1.3. 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. Highlight the Cal Alert parameter using the “
< >
,
∧
,
∨
” soft keys. When the Cal Alert parameter is highlighted, you may turn the function ON
and OFF by pressing the “Change” soft key. Press the ENTER key to accept the new setting or
the EXIT key to cancel and return to the original setting.
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.
This parameter defaults to one year after the calibration date but may be overwritten to any
advanced date desired. Within the Calibration Due Date parameter are three separate fields,
month, day, and year. Use the “
< >
” soft keys to select the field within the date you want to