Inrush Current Measurement (Jaw And Flexible Current Probe); Frequency Measurement (Jaw And Flexible Current Probe) - Fluke 381 User Manual

381
Users Manual

Inrush Current Measurement (Jaw and Flexible Current Probe)

The Meter can capture the initial inrush current when starting a device such as a motor or light
ballast.
To measure the inrush current:
1. With the device under test off, turn the Meter Rotary Function Switch to
the Flexible Current Probe is being used for the measurement.
2. Center the Jaw or Flexible Current Probe around the device's live wire.
3. Push on the Meter.
E
4. Turn on the device under test. The inrush current (spike) is displayed on the Meter display.
See Figure 5.
CAT
1000 V
CAT
600 V

Frequency Measurement (Jaw and Flexible Current Probe)

To measure frequency:
1. Turn the Meter Rotary Function Switch to
used for the measurement.
2. Center the Jaw or Flexible Current Probe around the measurement source.
3. Push on the Meter to shift to Hz. The frequency is displayed on the Meter display.
Z
12
Figure 5. Inrush Current Measurement
Off
Off
1000 A
A
B
INRUSH
CAT
1000 V
CAT
600 V 1000 A
or if the Flexible Current Probe is being
A D
D
A
, , or
C
C
On
On
100 ms
D
if