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SMV 3000 Transmitter User’s Manual 1/9958
6.6 DPConf Configuration - PV1, Continued
Damping
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.
Background
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 =
Upper Range Limit
(Upper Range Value – Lower Range Value)
Example: The turndown ratio for a 400 inH
2
O transmitter with a range of
0 to 50 inH
2
O would be:
Turndown Ratio =
400
(50 – 0)
=
8
1
or 8:1