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18-38
Measure Commands
VRMS
Measures the maximum and minimum voltages on the selected source, then calculates the
peak-to-peak voltage as the difference between the two voltages. Sources are specified with
the MEASure:SOURce command or with the optional parameter following the VPP command.
<source> is {CHANnel<N> | FUNCtion<N> | RESPonse<N> | WMEMory<N>} where <N>, is
an integer, from 1 through 4.
Mode Oscilloscope and TDR modes only
Query :MEASure:VPP? [<source>]
The query returns the specified source peak-to-peak voltage.
Returned Format [:MEASure:VPP] <value>[,<result_state>]<NL>
<value> is the peak-to-peak voltage of the selected source. If SENDvalid is ON, the
<result_state> is returned with the measurement result. Refer to Table 18-3 on page 18-30
for a list of the result states.
Example 10 OUTPUT 707;”:SYSTEM:HEADER OFF”
20 OUTPUT 707;":MEASURE:VPP?"
VRMS
Command :MEASure:VRMS {CYCLe | DISPlay}, {AC | DC} [,<source>]
Measures the RMS voltage of the selected waveform by subtracting the average value of the
waveform from each data point on the display. Sources are specified with the MEA-
Sure:SOURce command or with the optional parameter following the VRMS command.
The CYCLe parameter instructs the RMS measurement to measure the RMS voltage across
the first period of the display. The DISPLay parameter instructs the RMS measurement to
measure all the data on the display. Generally, RMS voltage is measured across one waveform
or cycle, however, measuring multiple cycles may be accomplished with the DISPLay option.
The DISPlay parameter is also useful when measuring noise. The AC parameter is used to
measure the RMS voltage subtracting out the DC component. The DC parameter is used to
measure RMS voltage including the DC component. The AC RMS, DC RMS, and VAVG param-
eters are related as in the following formula:
DCVRMS
2
= ACVRMS
2
+ VAVG
2
<source> is {CHANnel<N> | FUNCtion<N> | WMEMory<N>} and <N> is 1, 2, 3, or 4.
Mode Oscilloscope mode only.
Query :MEASure:VRMS? {CYCLe | DISplay}, {AC | DC} [,<source>]
The query returns the RMS voltage of the specified source.
Returned Format [:MEASure:VRMS] <value>[,<result_state>]<NL>
<value> is the RMS voltage of the selected waveform. If SENDvalid is ON, the <result_state>
is returned with the measurement result. Refer to Table 18-3 on page 18-30 for a list of the
result states.
Example 10 OUTPUT 707;”:SYSTEM:HEADER OFF”
20 OUTPUT 707;":MEASURE:VRMS? CYCLE,AC"