Extech Instruments 7470 Operation Manual page 78

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/40W 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 300V/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
11.3.3. Calibration of 7473 AC Hipot Current
AC Hipot, 10mA current range
Press the  key, the program will advance to the AC 10.00mA range calibration of the
hipot test. The display will show:
AC 10.00mA, 100K
T E S T
e
Connect a resistor about 100K/10W in series with a AC 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/10.00mA 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 10.00mA range for calibration and the
display will show:
74
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