Precision Digital PD865 - Manual (Page 55)

PD865 Snooper Modbus Serial Input Meter Instruction Manual
55
Noise Filter (filter)
Most applications do not require changing this parameter. It is intended
to help attain a steady display with an unsteady (noisy) input data.
The field selectable noise filter averages any minor or quick changes in
the input data and displays the reading with greater stability.
Increasing the filter value will help stabilize the display, however this will
reduce the display response to changes on the input data.
The filter level may be set anywhere from 2 to 199.
Setting the filter value to zero disables the filter function, and the bypass
setting becomes irrelevant.
Noise Filter Bypass (bypass)
The meter can be programmed to filter small input changes, but allow
larger input changes to be displayed immediately, by setting the bypass
value accordingly.
If the input signal goes beyond the bypass value, it will be displayed
immediately with no averaging done on it.
The noise filter bypass value may be set anywhere from 0.2 to 99.9.
Increasing the bypass value may slow down the display response to
changes on the input signal.
Low-Flow Cutoff (CutofF)
The low-flow cutoff feature allows the meter to be programmed so that
the often unsteady output from a differential pressure transmitter, at low
flow rates, always displays zero on the meter.
The cutoff value may be programmed from 0 to 999999. When the input
data is below the cutoff value, the meter will display zero. Programming
the cutoff value to zero disables the cutoff.