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Agilent E1538A Enhanced Frequency/Totalize/PWM SCP 49
exceeds the time-out period (i.e. frequency below LIMit:LOWer), then
a frequency of 0 Hz will be returned to the E1415/19/22 algorithm.
• Typical use for this command is to allow the user to bound the period
of time that is allowed for making a frequency measurement, thus,
preventing the SCP from “hanging” during measurement.
In this case, typically, the LIMit:LOWer frequency would be the same
as, or slower than the frequency associated w/the APERture time.
• An unusual (but valid) use is to set the LIMit:LOWer frequency to be
greater than the frequency associated with the APERture period, which
can provide a means to abort a frequency measurement if at any point
during the measurement, the input waveform frequency is slower than
the configured LIMit:LOWer frequency.
Note The lower limit set by SENS:FREQ:LIM:LOW is for a single signal period,
not the sum of NPERiods. Unless at least one period of the input signal
exceeds the limit value set, then NPERiods will be measured and averaged
to return a reading. For instance if;
SENS:FREQ:MODE NPERiods,<ch_list>
SENS:FREQ:NPERiods 255
SENS:FREQ:LIMit:LOWer 0.01667 ! 60 second period
...
INIT
As long as the input signal frequency is slightly greater than the
LIMit:LOWer frequency, then the SCP will not time-out and will take 255 *
(~60sec) = ~255 minutes to take a single frequency measurement.
Alternatively, if even one of the input waveforms has a frequency that is
lower than the LIMit:LOWer frequency, then 0 Hz would be immediately
returned to the E1415/19/22 algorithm.
• Related Commands: SENS:FREQ:APER, SENS:FREQ:LOW?
• *RST Condition: is “MINimum” frequency (i.e. 0.01667 Hz [period
= 60sec]).
• Send with VXIplug&play Function: hpe14XX_cmd(...)