3-15
Operation
D/A Trim (Digital-to-Analog Trim)
Digital-to-Analog Trim enables you to check and trim the analog
output in a single function. If the analog output is trimmed, it will be
scaled proportionally through the range of the output. To trim the
digital-to-analog output, initiate the D/A Trim function and connect an
ammeter to the loop to measure the actual analog output of the meter.
Follow the on-screen functions to complete the task.
Scaled D/A Trim
Scaled D/A Trim enables you to calibrate the flowmeter analog output
using a different scale than the standard 4-20 mA output scale.
Non-scaled D/A Trimming (described above), is typically performed
using an ammeter where calibration values are entered in units of
milliamperes. Both non-scaled D/A trimming and scaled D/A trimming
allow you to trim the 4-20mA output to approximately ±5% of the
nominal 4mA end point and ±3% of the nominal 20mA end point.
Scaled D/A Trimming allows you to trim the flowmeter using a scale
that may be more convenient based upon your method of measurement.
For example, it may be more convenient for you to make current
measurements by direct voltage readings across the loop resistor. If
your loop resistor is 500 Ohms, and you want to calibrate the meter
using voltage measurements made across this resistor, you could
rescale (select CHANGE on the 275) your trim points from 4-20mA to
4-20mA x 500 ohm or 2-10 VDC. Once your scaled trim points have
been entered as 2 and 10, you can now calibrate your flowmeter by
entering voltage measurements directly from the voltmeter.
Recall Factory Trim
Recall Factory Trim enables you to return to the original factory
trim values.
Pulse Output
Pulse Output reports the frequency of the pulse output.
NOTE
The HART Communicator will allow configuration of the pulse features
even if the pulse option (Option P) was not ordered.
HART Comm. 1, 4, 3, 1, 4
HART Comm. 1, 4, 3, 1, 5
HART Comm. 1, 4, 3, 1, 6
HART Comm. 1, 4, 3, 2
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