Model DT233-0600
Dual Two-Wire mV/TC Input Transmitters
Acromag, Inc. Tel: 248-295-0880
- 17 -
http://www.acromag.com
- 17 -
https://www.acromag.com
Quick Overview
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Output Calibration (Each of Two Outputs)
Scroll down the Calibration page to access the Output Calibration controls:
output channel selector, adjustment controls, and the
[CALIBRATE
OUTPUT ZERO]
and
[CALIBRATE OUTPUT FULL-SCALE]
buttons.
First select the Output channel to calibrate, and its output range will be
displayed along with some instructions on how to proceed.
For Output Zero calibration, use the output adjustment slider and the
coarse and fine adjustment controls to precisely set your output zero level
while precisely monitoring your output signal. Be sure to use a meter with
an accuracy at least 4x better than the signal you are measuring for best
results. Note that the output adjustment controls temporarily remove
control of the output from the input to accomplish calibration (control of
the output level returns to the input signal after 30 seconds).
Once your output level is precisely set to its zero point (4.000mA for this
transmitter), tap the
[CALIBRATE OUTPUT ZERO]
button one time to set
the output DAC level (its corresponding digital count) to correspond to the
zero (0%) of your output range.
For Full-Scale calibration, use the output adjustment slider and the coarse
and fine adjustment controls to precisely set your output full-scale level
while precisely monitoring your output signal. Be sure to use a meter with
an accuracy at least 4x better than the signal you are measuring for best
results. Note that the output adjustment controls temporarily remove
control of the output from the input level to accomplish calibration
(control of the output level returns to the input signal after 30 seconds).
Once your output level is precisely set to its full-scale level (20.000mA for
this transmitter), tap the
[CALIBRATE OUTPUT FULL-SCALE]
button one
time to set the output DAC level (its corresponding digital count) to
correspond to the full-scale (100%) level of the output range.
Repeat the Output Calibration of zero and full-scale for the second output
as required by selecting the opposite 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 input correct signal levels. If you are
measuring voltage across an output load resistance to measure the
current level (recommended), make sure that you use exact resistance
when calculating the measured loop current. When rescaling I/O, make
sure that you have adequate I/O span, as
“
too-tight
”
input or output spans
will have diminished resolution and magnify error.
