Operation Page 49 of 85
2.11.4 IR AUTO RANGE
The IR Auto Range setting allows the option of using the full scale current range (ON) or using
the user programmed maximum current limit (OFF). To increase measurement resolution in IR
mode, select IR Auto Range ON. To increase measurement speed in IR mode, select IR Auto
Range OFF. The instrument default value for IR Auto Range is ON.
2.11.5 GFI
The Ground Fault Interrupt (GFI) function can be programmed ON or OFF and the instrument
default setting is ON. When GFI is activated, the ground fault interrupt circuit detects leakage
current to ground. If the leakage is >0.5mA, the high voltage will be shut down in less than
0.5ms.
NOTE:
When using the Sentry Plus instrument with the Sentry 50 Ground Bond Tester,
GFI must be turned OFF.
2.11.6 FAIL RESTART
The FAIL RESTART function can be programmed ON or OFF and the instrument default setting
is OFF. When the Fail Restart function is turned ON, the Sentry Plus instrument does not
require the STOP button to be pressed to restart the test. This mode is typically used in
conjunction with the remote I/O connections to automatically restart the test when a failure
occurs. This can be done by connecting one Fail contact (pin 8) to the Start contact (pin 5) and
the other Fail contact (pin 9) to the COM contact (pin 3).
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