Measuring Inrush Current - Fluke 353 User Manual

Measuring Inrush Current

Inrush current is surge current that occur when an
electrical device is first powered on. Once the device has
reached its normal working condition, the current
stabilizes. See Figure 4.
To capture the inrush current reading:
1. With the system under test powered down, place the
source wire into the Meter jaws.
Turn the knob to A.
2.
Press E on the Meter.
3.
4. Power up the system under test. The inrush current
is shown on the Meter display.
355 AC/DC CLAMP METER
Auto Range
TRUE RMS
2000 A 600 V CAT
AC+DC AC+DC
A A
A A A A
V
OFF OFF
V
V AC+DC
HOLD
RANGE ZERO
INRUSH Hz
MIN MAX FILTER
COM V
600 V CAT
1000 V CAT
Figure 4. Measuring Inrush Current
Clamp Meter
Using the Meter
4
355 AC/DC CLAMP METER
Auto Range
TRUE RMS
2000 A 600 V CAT
AC+DC AC+DC
A A
A A A A
OFF OFF V
V
V AC+DC
Auto Range
HOLD
ZERO
RANGE
INRUSH Hz
MIN MAX FILTER
COM V
600 V CAT
1000 V CAT
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