Measurement Of Inrush Current - Mastech MS2225A Operation Manual

4.22 Measurement of inrush current

Electric shock.
Remove the probe from the meter before measuring
with the current clamp.
4.22.1 Turn the change-over switch to 60/600 A or 1000 A
AC current gear.
4.22.2 Hold the trigger, and open the clamp to clamp one
conductor of measured circuits.
4.22.3 Long press the "HZ%/INRUSH/▲" button more
than 2 seconds to enter the mode of inrush current
measurement. Then the LCD will display "INR", and
the meter will display and hold the inrush current
value until the motor start-up is detected.
4.10.4 Read the inrush current value from LCD display.
Note:
1) If two or more circuits of the measured circuits are
clamped, the measurement result will be not correct.
2) In order to acquire the accurate reading, the measured
conductor shall be in the center of clamp as far as
possible.
3) The LCD only displays "OL" in the manual range mode
indicating the over range, and the higher range should
be selected.
4) Under the manual range mode, if the measured value is
not known in advance, the highest level should be set
for the range.
5) " " means that the maximum input current is 1000A
AC (effective value).
WARNING
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Figure 8 Schematic Diagram for Inrush Current Measurement at
AC Current Gear
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