Fluke 355 Fluke 353 & 355 Users Manual - Page 17

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. 2. Turn the knob to A. 3. Press E on the Meter. 4. Power up the system under test. The inrush current is shown on the Meter display. Off 1 Clamp Meter Using the Meter On 355 AC/DC CLAMP METER Auto Range TRUE RMS 2000 A 600 V CAT A OFF A AC+DC A V V VAC+DC RANGE HOLD ZERO INRUSH Hz MIN MAX FILTER COM V 600 V CAT 1000 V CAT 2A INRUSH 3 355 AC/DC CLAMP METER Auto Range TRUE RMS 2000 A 600 V CAT A OFF A AC+DC A V V VAC+DC RANGE HOLD ZERO INRUSH Hz MIN MAX FILTER COM V 600 V CAT 1000 V CAT 100 ms 4 Auto Range Figure 4. Measuring Inrush Current fbq07.eps 9