DDS EX
Explosion-Proof Transmitter and Controller Instruction Manual
61
Noise Filter (
filter
)
Most applications do not require changing this parameter. It is intended to help
attain a steady display with 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. This parameter is associated with the analog input channels.
Noise Filter Bypass (
bypass
)
The scanner 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. This parameter is associated with the analog input channels.
Rounding Feature (
round
)
The rounding feature is used to give the user a steadier display with fluctuating signals. Rounding is used
in addition to the filter function. Rounding causes the display to round to the nearest value according to the
rounding criteria selected by the user. This setting affects the last three digits, regardless of decimal point
position.
Select Menu (
SELect
)
The
Select
menu is used to select the input data linearization function (linear, square root, programmable
exponent, or round horizontal tank), math functions, constants, low-flow cutoff, and analog output
programming. Multi-point linearization is part of the linear function selection.
