Model DT23x-0600
Dual Two-Wire DC I/V Input Transmitters
Acromag, Inc. Tel: 248-295-0880
- 23 -
http://www.acromag.com
- 23 -
https://www.acromag.com
Calibration
…
continued
Note:
Input calibration from the factory has all sub-
ranges of a nominal input range along an input
terminal path calibrated automatically by
extrapolating from the calibration of the major range
for that path to save time (see Specifications Table 1
and note the ranges that share the same divider and
gain setting). One exception is ±1mA of the DT236
where its gain doubles requiring it be calibrated
separately from ±20mA. However, you still have the
option of calibrating a specific sub-range
independent of its major range to increase precision
if required, but make sure you always calibrate the
smaller input range after its major range to prevent
the subsequent re-calibration of a range from
stepping on the calibration of a smaller sub-range.
CALIBRATION
–
Each Output
Click the
[Output Cal Instructions]
button to begin output
calibration and enable the Output [Zero] and [Full-Scale] buttons.
First, select Output Channel 1 or 2, then use the course and fine
adjustment buttons to adjust the output current to precisely
4.000mA. Be sure to measure this level accurately or
performance will be degraded. After driving the output to
4.000mA, click the Output
[Zero]
button of the Calibration Output
section to calibrate the output zero level at the channel.
Next, use the course and fine adjustment buttons to adjust the
output signal to precisely 20.000mA. Be sure to measure this
level accurately or performance will be degraded. After driving
the output to 20.000mA, click the Output
[Full-Scale]
button of
the Calibration Output section to calibrate the output full-scale
level at the channel.
Repeat this process for the second output channel.
If following calibration, your output acts erratic or appears
imprecise, you may need to repeat input or output calibration,
being very careful to take accurate measurements and drive
correct signal levels. If you are measuring voltage across an
output load resistance to measure the current level in an output
(recommended), make sure that you use exact resistance when
calculating the measured loop current.
CALIBRATION STATUS
This field displays calibration status messages like “No Error”,
“Transfer Error”, and “Timeout Error” during calibration. If you
encounter a Transfer or Timeout Error, you should repeat the
calibration process.
FACTORY SETTINGS
You can use the
[Restore Factory Calibration]
button to restore
the transmitter
’s original factory calibration if you think you made
an error during recalibration, have degraded its performance, or if
the I/O channel appears erratic.
You can use the
[Restore to Factory Default]
button to return the
unit to its original factory state (see Specifications Reference Test
Conditions) and configuration settings. This does not restore
calibration, only configuration. Alternately, this button can be
used as a sanitation tool to restore the unit to its initial
configuration.