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Press the SETUP key to advance the menu to the Smart GFI parameter. The display
will show:
Use the ENTER key to toggle the Smart GFI ON and OFF.
The high voltage power supply of the HypotMAX is internally referenced to earth
ground. Since the leakage current measuring circuit of the instrument monitors only
current that flows through the return lead the possibility exists for current to flow
directly from the high voltage output to earth ground without being measured. The
SmartGFI (Ground Fault Interrupt) circuit monitors the current between the high
voltage output and earth ground. Therefore, if the operator touches the high voltage
lead and earth ground, the instrument will detect this hazardous condition and shut off
immediately.
SmartGFI goes beyond a standard GFI circuit by automatically determining the return
configuration of the DUT (grounded or floating) and enabling or disabling depending
on the situation. When the HypotMAX’
s Return lead is floating, the SmartGFI circuit
enables, protecting the test operator from electric shock. When the HypotMAX’
s
Return lead is earth grounded, the SmartGFI circuit disables and the instrument
operates in a grounded return mode of operation. If the GFI were to remain active in
this state, the tester would continuously fail since all current is returning through earth
ground. By disabling the SmartGFI circuit and operating in a grounded return mode,
HypotMAX allows the user to perform tests on devices that have their chassis’
s earth
grounded by the test fixture or test environment.
Toggle the Smart GFI function or press the SETUP key to forward to the GPIB
address selection. Press the EXIT key to return to the operation mode. The program
will store the Smart GFI setting automatically.
4.2.6. GPIB Address (optional)
Press the SETUP key to advance the menu to the GPIB address parameter. The
display will show:
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