Extech Instruments 7470 Operation Manual page 79

AC 10mA, 100K
T E S T
e
AC Hipot, 3.500mA current range
Press the  key, the program will advance to the AC 3.500mA range calibration of the
hipot test. The display will show:
AC 3.500mA, 100K
T E S T
e
Connect a resistor about 100K/10W in series with a AC standard Ammeter which can
measure up to 3.500mA to the output leads. The Ammeter should be connected to
the return lead, then press the TEST button, the program will automatically generate an
output on the output connectors about 350V/3.00mA and the display will show:
Current =
Enter Standard I-out
Use the Numeric keys to enter the standard value of current, unit mA, and then press
the ENTER key to store the standard value of AC 3.500mA range of the hipot test and
the display will show:
AC 3.500mA, 100K
OK
T E S T
e
11.3.4. Calibration of 7472 DC Hipot Current
DC Hipot, 10mA current range
Press the  key, the program will advance to the DC 10.00mA range calibration of the
hipot test. The display will show:
DC 10.00mA, 100K
T E S T
e
Connect a resistor about 100K/10W in series with a DC standard Ammeter which can
measure up to 10.00mA to the output leads. The Ammeter should be connected to
the return lead, then press the TEST button, the program will automatically generate an
output of about 1000V/10mA and the display will show:
Current =
Enter Standard I-out
OK
t o C a l i b r a t
t o C a l i b r a t
mA
t o C a l i b r a t
t o C a l i b r a t
mA
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