Keysight 34950A User’s Guide 35
gated totalizer measurement. The number of totalized counts is ‘5’ in this
particular example.
Initiated Measurement Mode
Measurements such as frequency, period, duty cycle, and pulse width require an
initiate command and a gate. The SENSe:COUNter:INITiate command is used
to initiate (arm) the measurement. The measurement is gated by either an internal
(default) or the external gate source. For measurements the external gate acts like
an external trigger which triggers the internal gate timer.
The gate source is set using the SENSe:COUNter:GATE:SOURce command. The
default gate source is INTernal. The gate is the aperture over which the signal
data is gathered. When the gate is internal, the measurement begins as soon as
the INITiate command is received.
Since the measurements are all derived from the same basic measurement, you
can retrieve the measured frequency, period, duty-cycle, and pulse width from the
same initiated and gated measurement. For example, the following commands set
the counter to measure the input signal for 1 ms using the internal gate. The
frequency, period, duty cycle, and pulse width are returned as floating point
numbers.
CONF:COUN:FREQ 1e-3, (@1301)
SENS:COUN:INIT (@1301)
SENS:COUN:FREQ? (@1301)
SENS:COUN:PER? (@1301)
SENS:COUN:PWID? (@1301)
SENS:COUN:DCYC? (@1301)
The CONFigure:COUNter:FREQuency command parameter sets the internal
gate time (to 1e-3 or 1 ms in the above example). You can also set the gate time
using the SENSe:COUNter:GATE:TIME command.
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