Extech Instruments 7470 Operation Manual page 46

advance the program to the Arc Sense parameter or press the EXIT key to exit from the
setting mode to the operation mode.
Advance the menu to the Arc Sense parameter. The display will show:
Arc Sense =
Range : 1 - 9
For model 7470, 7472 and 7473, the range of ARC sense is from 1 to 9.
For model 7473, if the voltage is lower than 15KV, the range of Arc sense is from 1 to
9.If the voltage is higher than 15KV, the range is from 1 to 7.
Use the Numeric keys to enter the Arc Sense setting, and then press the ENTER key.
The numeric value is proportional to the amount of sensitivity, i.e. "9" is the highest
sensitivity. The program will store the Arc Sense setting and advance to the Connect
mode selection automatically.
If the Arc Detect mode is set to ON, the program will indicate an arc failure when the arc
current is over the setting and the program will shut down the test immediately.
If the Arc Detect mode is set to OFF, the program will not indicate an arc failure when
the arc current is over the setting.
5.2.10. Ramp-HI selection (DC units only)
Advance the menu to the Ramp-High parameter. The display will show:
Ramp-HI =
ENTER to Select
Use the ENTER key to select the Ramp-HI mode, then press the  or  key to advance
the program to another test parameter or press the EXIT key to exit from the setting
mode to the operation mode.
The Ramp-HI function is active during the Ramp period only. Ramp-HI will allow
current higher than the normal HI-Limit current setting of the DC Withstand Voltage test
to avoid false failure due to charging current.
5.2.11. Charge-LO setting (DC units only)
Advance the menu to the Charge-LO parameter. The display will show:
Charge-LO =
TEST to Auto Set
The Charge-LO function is used to check if the test cables are connected properly at
the beginning of a test. A capacitive DUT will draw charging current on the DC
42
X
9 = High
ON
XXX.X A
or Ramp-HI = OFF
ENTER to Select