Agilent Technologies 6814B, 6834B Measuring Peak Inrush Current, Press Trigger Control and Enter

4 - Front Panel Operation

7 - 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 unit is operating in the low voltage range. (The low voltage	RANGE	150
	range has twice the output current rating of the high voltage range.) In the
	Voltage menu, press  to access the range command. If necessary, press ° to
	set the range to 150 and press Enter.
5.	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.
6.	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)

7.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.

8.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

9.	Initiate (or enable) the unit for one immediate trigger from the front panel.	INIT:IMMED
	Press Trigger Control and Enter.
10.	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.
11.	Enable the output by pressing Output On/Off.	0 V	60 HZ
12.	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.

On three-phase ac sources you can only return the peak inrush current from the selected phase because the front panel can only display one phase at a time. Refer to the ac source Programming Guide on how to return simultaneous measurements from all three phases.

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