VXI VT1538A SENSeFREQuencyAPERture?, SENSeFREQuencyLIMitLOWer, Related Commands SENSFREQAPER

[SENSe:]FREQuency:APERture?

[SENSe:]FREQuency:APERture? <channel> returns the currently set APERture time.

Parameters

Parameter	Parameter	Range of	Default
Name	Type	Values	Units
channel	string	100 - 163	none

Comments • If the channel specified is 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:APER

•Returned Value: returns numeric aperture in seconds, The type is float32.

•Send with VXIplug&play Function: hpe14XX_cmdReal64_Q(...)

SENSe:FREQuency:LIMit:LOWer

[SENSe:]FREQuency:LIMit:LOWer <freq_limit>,<ch_list> allows you to specify a frequency lower limit beyond which the E1538A will stop waiting for a signal transition and will return a frequency value of zero. Conceptually, this is an input signal period time-out.

Parameters

Parameter	Parameter	Range of	Default
Name	Type	Values	Units
freq_limit	numeric (float32)	.01667 to 250	Hz
ch_list	string	100 - 163	none

Comments • <ch_list> must be channels on an E1538A SCP.

Note Although SENS:FREQ:LIM:LOW can set a "timeout period" as long as 60 seconds (.01667Hz), the lowest frequency measurement supported by the E1538A is 1 Hertz.

•The period associated with the FREQ:LIMit:LOWer frequency is the time the SCP will allow for any single cycle period.

At any time during the frequency measurement, if the signal’s period

48 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP