Technical data

634 Agilent Infiniium 90000 Series Oscilloscopes Programmer's Reference
24 Measure Commands
:MEASure:VRMS
Command :MEASure:VRMS {CYCLe | DISPlay},{AC | DC} [,<source> [,{VOLT | DBM}]]
The :MEASure:VRMS command 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 :MEASure:SOURce
command or with the optional parameter following the :MEASure:VRMS
command.
CYCLe The CYCLe parameter instructs the RMS measurement to measure the
RMS voltage across the first period of the display.
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.
AC The AC parameter is used to measure the RMS voltage subtracting the DC
component.
DC The DC parameter is used to measure RMS voltage including the DC
component.
The AC RMS, DC RMS, and VAVG parameters are related as in this
formula:
DCVRMS
2
=ACVRMS
2
+VAVG
2
<source> {CHANnel<N> | FUNCtion<N> | WMEMory<N> | CLOCk | MTRend |
MSPectrum | EQUalized}
MTRend and MSPectrum sources are only available if the oscilloscope has
the EZJIT option installed and the feature is enabled.
The CLOCk source is only available if the oscilloscope has the High Speed
Serial option installed and the feature is enabled.
The EQUalized source is only available if the oscilloscope has the High
Speed Serial option and the Serial Data Equalization option installed and
the features are enabled. This command uses the Feed- Forward Equalized
(FFE) signal as the source.
<N> CHANnel<N> is an integer, 1 - 4.
FUNCtion<N> and WMEMory<N> are:
An integer, 1 - 4, representing the selected function or waveform memory.
VOLT | DBM Specifies the units of the measurement as either volts or decibels.