PTB 200 15 (28)
Digital Barometers
SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1
FILT Setting the filter parameters
FILT xxx yyyy<cr>
where
xxx ON or OFF
yyyy FAST or SLOW
The FILT command is used to set additional numerical filtering modes.
FAST mode introduces a multiplication factor of 4 to the integration time
set with the MTIM command. In addition a special algorithm that takes
the derivative of the pressure change into account is used.
SLOW mode introduces a multiplication factor of 16 to the integration
time set with the MTIM command. No derivative of the pressure change
is taken into account.
The filter settings also affect the settling time of the barometer.
Example of setting the integration time to 5 seconds (MTIM 50, filter
FAST):
>MTIM<cr>
Mtim : 64 ? 50<cr>
>FILT ON FAST<cr>
Press. filter : ON
FAST
Example of setting the integration time to 60 seconds (MTIM 150, filter
SLOW):
>MTIM<cr>
Mtim : 50 ? 150<cr>
>FILT ON SLOW<cr>
Press. filter : ON
SLOW
>FILT OFF<cr>
turns the filter mode off. Then only the MTIM command affects the inte-
gration and settling times.
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