PSM1700 PsimetriQ user manual
7-2
There are two time constants for the filter, normal or slow,
or the filter can be deselected. The filter applies an auto
reset function to give a fast dynamic response to a change
of measurement – this function can be deselected and the
filter forced to operate with a fixed time constant for use
with noisy signals.
The nominal values are:
The filter dynamics are usually set to “auto reset” where
the filtering is reset in response to a significant change in
data. This speeds up the response of the instrument to
changing conditions. This function can be disabled so that
the filtering has a fixed time constant, which would have
an exponential response to a step change.
When the generator is not used and so the measurement
is synchronised to the input frequency measured on CH1,
there is a low frequency option that extends the frequency
measurement down to 20mHz. This low frequency option
also applies a digital filter, which can be useful when
measuring in a low frequency, noisy environment.
There are 3 further modes apart from ‘normal’:
Data streaming is a special high speed mode for use with
communications to a PC – see section on RS232.
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