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Agilent E1538A Enhanced Frequency/Totalize/PWM SCP 47
Parameters
Comments • Channel must specify a single channel
• Returned Value: returns one of NORM or INV. The type is string.
• Send with VXIplug&play Function: hpe14XX_cmdString_Q(...)
[SENSe:]FREQuency:APERture
[SENSe:]FREQuency:APERture <
aperture
>,<
ch_list
> sets the time
allowed to determine signal frequency 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 • For APERture to effect the measurement, SENS:FREQ: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:FREQ:MODE, SENS:FREQ:NPERiods,
SENS:FREQ:LIM:LOWer, SENS:FUNC:FREQ
• *RST Condition: .001 sec
• Send with VXIplug&play Function: hpe14XX_cmd(...)
Usage SENS:FREQ:APER .01,(@144)
set channel 44 aperture to
10msec
Parameter
Name
Parameter
Type
Range of
Values
Default
Units
channel string 100 - 163 none
Parameter
Name
Parameter
Type
Range of
Values
Default
Units
aperture numeric (float32) .001 to 1 (.001 resolution) seconds
ch_list string 100 - 163 none