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Measuring the output
All measurements are based on acquiring and subsequently processing output waveform information.
When the ac source is on, it takes measurements and updates the front panel meter continuously. The
Meter key accesses the measurement functions from the front panel.
The SCPI MEASure command acquires new waveform information each time it is executed. The SCPI
FETCh command does not acquire new waveform information but extracts the desired information from
previously acquired waveform data. SCPI commands let you measure phases individually or
simultaneously measure all phases using the FETCh command.
Measurement functions
The following example illustrates the measurements that can be returned by the front panel of the ac
source when sourcing power to a typical non-resistive load such as a power supply. The ac source output
voltage and current waveforms are shown on the next page.
NOTE: On Agilent 6811B, 6812B, and 6813B units, the Input key selects the meter coupling
and hence, what the meter will measure. The choices are: AC only, DC only, or AC +
DC.
120V 60HZ rms voltage and frequency
(FETC/MEAS)
120V 1.925A rms voltage and current
1.93A 60HZ rms current and frequency
120V 150.5W rms voltage and power
2.82 CREST F current crest factor
5.379A PK REP peak current, repetitive
36.83A PK NR peak current, non repetitive
230.6VA apparent power
175.2 VAR reactive power
0.65 PFACTOR power factor
Note that in addition to the measurement functions listed above, the Agilent 6834B unit can also measure total power
of all phases and neutral rms current.
Meter