Technical data

Measure Commands 25
Agilent Infiniium 9000 Series Oscilloscopes Programmer's Reference 553
:MEASure:FREQuency
Command :MEASure:FREQuency [<source>[,<direction>]]
The :MEASure:FREQuency command measures the frequency of the first
complete cycle on the screen using the mid- threshold levels of the
waveform (50% levels if standard thresholds are selected).
The source is specified with the :MEASure:SOURce command or with the
optional parameter following the :MEASure:FREQuency command.
The algorithm is:
If the first edge on the screen is rising,
then
frequency = 1/(second rising edge time - first rising edge time)
else
frequency = 1/(second falling edge time - first falling edge time)
<source> {CHANnel<N> | FUNCtion<F> | DIGital<M> | 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.
WMEMory<N> is an integer, 1- 4.
<F> FUNCtion<F> is an integer, 1- 16.
<M> An integer, 0- 15. Digital channels are available on mixed-signal
oscilloscopes.
<direction> {RISing | FALLing}
Specifies direction of edge for measurement. When <direction> is specified,
the <source> parameter is required.
Using the <direction> parameter will set the "Measure All Edges" mode if it
is not currently set. You can use the :MEASure:JITTer:STATistics command
to turn the "Measure All Edges" mode off (or on again). See
":MEASure:JITTer:STATistics" on page 581.
Example This example measures the frequency of the channel 1 waveform.