Front Panel Operation - 4

9 - Measuring Peak Inrush Current

Peak inrush current is a non-repetitive measurement in the sense that peak inrush current occurs only when the unit under test is first turned on. In order to repeat the measurement, you must turn the unit off and wait for any input filter capacitors to discharge completely.

This example shows you how you can measure the peak inrush current using the front panel meter. The voltage is set to 120 V rms and the output is triggered at an output phase of 75°, which optimizes the conditions under which inrush current is applied to the unit under test.

 

Action

Display

1.

Set the immediate voltage to 0. Press Voltage, then press 0 and Enter.

VOLT

0

2.

Set the triggered voltage to 120 V rms. In the Voltage menu, press to

VOLT:T

120

 

access the triggered voltage command. Then press 1 2 0 Enter.

 

 

3.

Set the voltage mode to step. In the Voltage menu, press to access the

VOLT:M

STEP

 

mode command. Press ° to scroll to STEP and press Enter.

 

 

4.

Make sure the triggered voltage slew rate is set to the fastest possible speed.

SLEW:T 9.9000+E37

 

In the Voltage menu, access the triggered slew command. If necessary, reset

 

 

 

the slew rate to a faster speed.

 

 

5.

Make sure the peak current and rms current limits are set to high values. In the

CURR:LEV 6.5

 

Current menu, access the rms current limit and then the peak current limit

CURR:PEAK 40

 

commands. If necessary, reset the rms current and the peak current limits to

 

 

 

higher values.

 

 

 

(Agilent 6811B units have an rms current limit of 3.25 A. Agilent 6813B units

 

 

 

have an rms current limit of 13 A and a peak current limit of 80 A)

 

 

6.Synchronize the trigger source with a reference phase angle. In the Trigger Control menu, press to access the sync source command. Press ° to obtain PHASE and press Enter.

7.Set the reference phase angle to 75°. In the Trigger Control menu, press to access the sync phase command. Then press 7 5 Enter.

SYNC:SOUR PHASE

SYNC:PHAS 75

8.

Initiate (or enable) the unit for one immediate trigger from the front panel.

INIT:IMMED

 

Press Trigger Control and Enter.

 

 

9.

Set the meter function to measure nonrepetitive peak inrush current. In the

0 A

PK NR

 

Meter menu, press to access the peak inrush current display.

 

 

10.

Enable the output by pressing Output On/Off.

0 V

60 HZ

11.

Send the trigger to step the output from 0 V to 120 V. Press Shift Trigger.

48 A

PK NR

 

The inrush current is displayed on the Meter.

 

 

NOTE: With fast and/or large voltage transitions, the CC annunciator may turn on due to current in the output capacitor. This is normal and will limit the rate of change of output voltage. To prevent the CC operating mode from limiting the rate of change of output voltage, program the peak current limit to a higher value.

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Agilent Technologies 6813B, 6811B, 6812B Measuring Peak Inrush Current, Currlev, Currpeak, Syncsour Phase Syncphas, Pk Nr
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6812B, 6811B, 6813B specifications

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