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SCPI Commands for the Counter
VX4101A MultiPaq Instrument User Manual
3–97
with a minimum of 1e–8 and a maximum of five seconds. A longer aperture may
be set with the SENSe:PWIDth:APERture command.
MEASure[1|2]([:SCALar]|:ARRay):PHASe? [<array size>[,<expected value>[,resolu-
tion>]]]
This query performs a phase measurement. The suffix selects the channel for the
beginning of the measurement. For example, MEAS1:PHASe will perform a
phase measurement from channel one to channel two, whereas MEAS2:PHASe
will perform a phase measurement from channel two to channel one.
This command will modify the following:
Function set to PHAS
Aperture?events mode set to APERture
The input channel attenuation, offset, gain, level, and sloped can be modified.
NOTE. Time Interval With Delay, Phase, and Duty Cycle use all available
hardware timers. When the counter is in one of these modes, the aperture is
controlled by software and has a minimum period of approximately 10 ms.
MEASure[1|2]([:SCALar]|:ARRay):RTIMe|FTIMe? [<array size>[,<low refer-
ence>[,<high reference>[,<expected value>[,<resolution>]]]]]
This query configures the Counter to measure the rise or fall time of the signal
on the MEASure suffix input channel. The measurement is initiated and the
result placed in the output buffer. The units of the <low reference> and <high
reference> are percentage. The units of <expected value> and <resolution> are
seconds. If the <expected value> argument is used, the expected period of the
input signal should be used, instead of the expected rise/fall time. This measure-
ment uses both comparators of the input channel.
If a reference value is specified and INPut:SETup:AUTO is set to OFF,
INPut:SETup:AUTO will be set to ONCE. If a reference value is not specified,
the input channel comparator 1 level will be set to –.25 V and input channel
comparator 2 level will be set to +.25 V for a rise time measurement. For fall
time, the reverse is set.
This command will modify the following:
function - set to RTIMe or FTIMe
aperture - described below
aperture/events mode - set to APERture
if autosetup mode is ON or ONCE, the input channel attenuation, offset, gain,
level and slope can be modified