6.6
DPConf Configuration - PV1,
Damping
Background
58
Adjust the damping time constant for Differential Pressure (PV1) to
reduce the output noise. We suggest that you set the damping to the
smallest value that is reasonable for the process.
The damping values (in seconds) for PV1 are:
0.00 d , 0.16, 0.32, 0.48,
1.0, 2.0, 4.0, 8.0, 16.0, and 32.0
d Factory setting.
The electrical noise effect on the output signal is partially related to the
turndown ratio of the transmitter. As the turndown ratio increases, the
peak-to-peak noise on the output signal increases. You can use this
formula to find the turndown ratio using the pressure range information
for your transmitter.
Turndown Ratio =
Example: The turndown ratio for a 400 inH
0 to 50 inH
2
Turndown Ratio =
SMV 3000 Transmitter User's Manual
Continued
Upper Range Limit
(Upper Range Value – Lower Range Value)
O transmitter with a range of
2
O would be:
400
8
=
1 or 8:1
(50 – 0)
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