Adjusting Damping Time - Honeywell ST 3000 User Manual

6.5

Adjusting Damping Time

Background
ATTENTION
Procedure
Table 23

Adjusting Damping Time

Step Press Key
1
C
DAMP
2
H
NEXT
3
6/05 ST 3000 Release 300 and SFC Model STS103 User's Manual
You can adjust the damping time to reduce the output noise. We suggest
that you set the damping to the smallest value that is reasonable for your
process.
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 range information for your
transmitter.
Turndown Ratio =
Example: The turndown ratio for a 400 inH
0 to 50 inH O would be:
2
Turndown Ratio =
The procedure in Table 23 outlines the keystrokes used to adjust the
damping time to two seconds as an example.
Read Display or Action
D A M P 1 P T
Ø . 3 S
D A M P 1 P T
S F C W O R K I
D A M P 1 P T
Ø . 5 S
Repeat Step 2 until display shows
D A M P 1 P T
2 . Ø S
Upper Range Limit
(Upper Range Value – Lower Range Value)
O transmitter with a range of
2
400 8
(50 – 0) = 1 or 8:1
Present damping time in seconds
3 0 1 1
E C O N D S
Message exchange is working.
3 0 1 1
N G . . .
Next highest damping time value in
3 0 1 1
seconds.
E C O N D S
ATTENTION
raises the setting while the
[▼
PREV
Or, you can key in a number that will
be converted to closest damping
value listed in Table 20.
Transmitter's damping time is now
set to two seconds.
3 0 1 1
ATTENTION
E C O N D S
press the [
damping time in the transmitter's
memory.
Description
The [▲ ] key
NEXT
] key lowers the setting.
You do not need to
] key to store the
ENTER
Continued on next page
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