Agilent Technologies Pacemaker 6814B Manuale Utente

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