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56 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP
[SENSe:]PERiod:APERture
[SENSe:]PERiod:APERture <
aperture
>,<
ch_list
> sets the time allowed to
determine signal period and return a reading to the algorithm. When
APERture is large enough to contain more than one signal period, the SCP
measures and averages the number of signal periods that will fit within this
APERture time. If the specified APERture is less than the input signal period,
the SCP stretches the aperture in order to measure at least one signal period.
This is known a Adaptive Aperture.
Parameters
Comments • The range for <aperture> is dependent on SENS:PER:RANGE:
-- When SENS:PER:RANGE is 1, <aperture> can range from .001 to
1 second.
-- When SENS:PER:RANGE is 4, <aperture> can range froom .004 to
4 seconds.
• For APERture to effect the measurement, SENS:PER:MODE must be
set to APERture.
• If the channels specified are on an SCP that doesn’t support this function,
an error will be generated. See your SCP’s User’s Manual for its
capabilities.
• Related Commands: SENS:PER:MODE, SENS:PER:NPERiods,
SENS:PER:LIM:UPPer, SENS:PER:RANGE, SENS:FUNC:PER
• *RST Condition: .001 sec
• Send with VXIplug&play Function: hpe14XX_cmd(...)
Usage SENS:PER:APER .01,(@144)
set channel 44 aperture to
10msec
Parameter
Name
Parameter
Type
Range of
Values
Default
Units
aperture numeric (float32) see text seconds
ch_list string 100 - 163 none