HT instruments HT9021 - Manual (Page 15)

HT9021
EN - 14
4.3.7. AC and DC Current measurement
CAUTION
Make sure that all the test leads are disconnected from the meter terminals for
current measurement.
Fig. 9: Taking AC and DC current measurements
1. Rotate the switch on 60A , 600A or 1000A position
2. Pushing MODE key and select the kind of measure “AC” or “DC”
3. On DC measure pushing PEAK/REL key to perform the zeroing of residual magnetization
current
CAUTION
On AC measure the possible blinking values shown at display with open input
terminals are not a problem of the meter and these values will not be added
to the measured value.
On DC measurement the zeroing operation of residual magnetization current is
essential to obtain accurate results
4. Put the conductor to be tested inside to the center of clamp jaw to perform accurated
measurements. Consider the notches on jaws as reference (see Fig. 2). The reading
will be displayed
5. On DC current measurement the “-“ symbol at display means that the meter is
connected in the opposite side compared with current direction (see Fig. 9)
6. When “O.L.” symbol is displayed, the result exceeds the maximum value that the
instrument is capable of measuring. Select an higher range
7. For HOLD, MAX/MIN, REL and PEAK features please refer to § 4.2