VXI VT1538A user manual SENSePERiodAPERture, Parameters

[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

Parameter	Parameter	Range of	Default
Name	Type	Values	Units
aperture	numeric (float32)	see text	seconds
ch_list	string	100 - 163	none

Comments • The range for <aperture> is dependent on SENS:PER:RANGE:

--When SENS:PER:RANGE is 1, <aperture> can range from .001 to

1second.

--When SENS:PER:RANGE is 4, <aperture> can range froom .004 to

4seconds.

•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

56 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP