Model DT335-0700
Dual RTD/Resistance Input Transmitter w/USB
Acromag, Inc. Tel: 248-295-0880
- 22 -
http://www.acromag.com
- 22 -
https://www.acromag.com
Calibration (Optional)
IMPORTANT:
The unit has already had its input and
output channels factory calibrated with a high level of
precision. If you attempt to recalibrate an I/O channel,
you could degrade its performance if not done properly,
or done using low grade equipment. Consider your
decision to recalibrate carefully.
CAUTION-Input Calibration:
Driving inputs outside of its
nominal input range will not be acceptable for calibration
of zero or full-scale. Since your input signal levels cannot
be validated during calibration, incorrect signal levels will
produce an undesired output response.
Once you have configured the unit channel(s), you can install
the unit in the field because it has already been factory
calibrated with high precision. But if at some point you
encounter excessive I/O error, or to satisfy company
maintenance requirements, you can optionally click the
Calibration
tab to display the Calibration control page as
shown at left.
You can use Input Channel to calibrate one channel, or both
in sequence. But before you calibrate input(s), sets the input
range and filter as required by your application. Calibration
of the input and output stages is a simple two-part process
initiated by simply clicking the Input Cal or Output Cal
“
...
Instructions”
button to begin the process and then follow
the on-screen prompts to continue.
CALIBRATION
–
Each Input Separately or In Sequence
Before attempting input calibration, set the nominal Input
Range and input filter
on the “
Configuration
” page
and make
sure you write your selection to the unit by clicking
[Send I/O
Config].
For the DT335, wire an input RTD or resistance
source (high-precision decade box) to TB1 (CH1) or TB3 (CH2)
as shown in Connections for your sensor wiring configuration.
After setting the input type/range/filter, select Channel 1,
Channel 2, or Dual Calibration as required. Then click the
[Input Cal Instructions]
button to begin input calibration and
enable the Input [Zero] and [Full-Scale] buttons.
Click Input
[Zero]
and you will be prompted to input the
minimum value of your selected input range at the selected
input channel. This will be the range minimum at the input
terminal and varies with the nominal Input Range selected
(calibration does not use the scaled range zero, but the zero
of the nominal input range selected). Once you input zero
precisely, click
[OK]
and follow the on-screen prompt to
calibrate zero.
Click the Input
[Full-Scale]
and you will be prompted to input
the full-scale value of your selected input range at the
selected input channel. This will be the range maximum at
the input terminal and varies with the Input Range selected
(calibration does not use the scaled range maximum, but the
full-scale of the nominal input range selected). Once you
input full-scale precisely, click the
[OK]
button and follow the
on-screen prompt to calibrate full-scale.