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48 Agilent E1538A Enhanced Frequency/Totalize/PWM SCP
[SENSe:]FREQuency:APERture?
[SENSe:]FREQuency:APERture? <
channel
> returns the currently set
APERture time.
Parameters
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
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
Parameter
Name
Parameter
Type
Range of
Values
Default
Units
channel string 100 - 163 none
Parameter
Name
Parameter
Type
Range of
Values
Default
Units
freq_limit numeric (float32) .01667 to 250 Hz
ch_list string 100 - 163 none