Model DT335-0700
Dual RTD/Resistance Input Transmitter w/USB
Acromag, Inc. Tel: 248-295-0880
- 21 -
http://www.acromag.com
- 21 -
https://www.acromag.com
Configuration...
HELP
–
You can press
[F1]
for Help on a selected or
highlighted field or control. You can also click the
[?]
button
in the upper-right hand corner of the screen and click to
point to a field or control to get a Help message pertaining to
the item you pointed to.
If the scaled input/output zero and full-scale points are
chosen too close together, performance will be degraded.
Once you have made your configuration selections, click the
[Send I/O Config]
button to write them to the module. You
can read the Status of your sent message to the unit in the
“Status” field.
Alternately, you could click
“
F
ile”
in the upper
left corner to save the settings to a file on your PC, for later
reference.
Select the Temperature Units...
Select the temperature units to use in the Configuration
Software. You may select Celsius, Fahrenheit, or Kelvin.
Select the Input Filtering
…
•
Set Low, Medium, High, or None (No digital filtering).
Higher filter levels result in lower average noise but
achieve slower I/O response times as indicated in
parenthesis next to the selection. Always set the
input filter as desired prior to calibrating an input.
Select the Configuration...
•
Select
“Four
-
wire”
and sensor lead-wire resistance
will not affect the sensor measurement.
•
Select
“Three
-
wire”
and sensor lead-wire resistance
will be compensated for (the [+] and [L] leads must
be the same length, diameter, and material).
•
Select
“Two
-
wire”
and sensor lead-wire resistance
will not be compensated for (the ± lead-wires will
contribute a positive shift in the sensor resistance).
Select the Break Direction...
•
Select
“
Downscale
”
to drive the transmitter output
to its under-range limit, or
“
Upscale
”
to drive the
output to its over-range limit if an input lead breaks
(RTD input readings always go down-scale). Outputs
may optionally be made reverse-acting, which does
not change the break detent. Under/over-range
limits are ~5% outside the selected nominal range.
Select the Current or Voltage Output Range
…
•
Unit has both DC voltage & DC current output
terminals at each channel. Current outputs drive 0-
20mA, 4-20mA, or Disabled, into loads
up to 525Ω.
Voltage Outputs drive ±10V, ±5V, 0-10V, 0-5V, or
Disabled, and the voltage output may drive 1KΩ or
higher loads. Only one output, current or voltage
may be loaded at one time.
Select the I/O Scaling
…
•
Scale nominal input/output ranges down as desired,
being careful not to reduce an I/O range too much,
as resolution decreases and noise/error is magnified
(each range halving reduces its resolution 1 bit).
•
Use these fields to set the input signal min/zero
value inside to correspond to the output range zero
value. Set the input signal max/full-scale value to
correspond to the output range full-scale value.
Rescale the output similarly and you can even swap
input levels to configure a reverse-acting output if
desired. Some under/over-range is built into every
nominal range and these limits vary by range.