Making Measurements
Average Measurements
Number of Power Line Cycles (NPLC)
Measurement Windowing
Seamless Current Measurement Ranging
Amp-Hour and Watt-Hour Measurements
Temperature Measurements
Digitized Measurements
Measurement Triggering
Average Measurements
The APS models have a fully integrated voltmeter and ammeter to measure the actual voltage and
current that is being supplied to the load.
Whenever the power supply is on, the front panel automatically measures output voltage and current
by acquiring a number of measurements over the specified number of power line cycles, and averaging
the samples. The default number of power line cycles is 1 cycle. At 1 cycle, the number of samples (or
points) is 3255 @60 Hz and 3906 @50 Hz. The default sample interval is 5.12 microseconds.
Use the following commands to make a measurement:
Front Panel Menu Reference SCPI Command
Select the Meter key.
Repeatedly press the key to cycle through the following
measurement functions:
Voltage, Current
Voltage, Power
Voltage, Current, Power
If dashes are displayed, the front panel measurement is
interrupted because a remoteinterface measurement is taking
place.
To measure average (DC) output voltage,
current, or power:
MEAS:VOLT?
MEAS:CURR?
MEAS:POW?
To return measurement data from the
previously acquired array:
FETC:VOLT?
FETC:CURR?
FETC:POW?
Number of Power Line Cycles (NPLC)
You can set the measurement time in number of power line cycles (NPLC). Using an integer number of
power line cycles can reduce measurement noise from line frequency sources.
4 Using the Advanced Power System
132 Keysight N6900/N7900 Series Operating and Service Guide
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