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October 2007
Analog Outputs
Setting
Choose which output channel you will program. A or B
Select
Choose the units for scaling the parameter on
Units
the selected channel
Type
Choose the type of output.
Set the parameter value that will produce full-
Upper
scale output (span) for the selected channel.
Set the parameter value that will produce zero
Lower
output for the selected channel.
Tracking
Determine how to handle analog output
Test
Set the parameter value to test the output
channel for proper operation.
Trim
Set values (in zero and span) to compensate for
variation in outputs.
Trimming the Output:
4-4
Table 4-3: Analog Output Options
Description
1. Attach a precision DVM (digital voltmeter) or mA calibrator to
the 4-20 mA output.
2. Select
RESET TRIM
. The options available are
SPAN
.
3. Select
TRIM ZERO
. The output changes to 4.00 mA.
4. Enter the actual value as read from the DVM/calibrator.
5. Select
TRIM SPAN
. The output changes to 20.00 mA.
6. Enter the actual value as read from the DVM/calibrator.
7. Exit the
TRIM
setting. You have completed output calibration.
Available Options
See Table 4-2 on the previous page for
the available units.
4-20 mA, 0-20 mA
Enter a number.
Enter a number.
Track (transmits actual temperature of
the mirror), Hold (transmits the last
prevailing dew point before balance
cycle)
Enter a number as a percent of scale.
Enter a number.
TRIM ZERO
Programming the OptiSonde
TRIM
and
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