Model DT335-0700
Dual RTD/Resistance Input Transmitter w/USB
Acromag, Inc. Tel: 248-295-0880
- 18 -
http://www.acromag.com
- 18 -
https://www.acromag.com
TECHNICAL REFERENCE
OPERATION STEP-BY-STEP
Connections
This section will walk you through
the Connection-Configuration-
Calibration process step-by-step.
But before you attempt to
reconfigure or recalibrate this
transmitter, please make the
following electrical connections
Note:
Your input source, output meters, and load resistors (current outputs) must
be accurate beyond the unit specifications, or better than ±0.1%. A good rule of
thumb is that your equipment accuracy should be four times better than the rated
accuracy you are trying to achieve with this transmitter.
Calibration Connections (at each Transmitter Input):
1.
Connect Each Input:
Connect a precision resistance decade box or RTD
simulator to the input at TB1 and/or TB3 according to the channel/RTD
configuration you are using (Refer to Sensor Input Connections). The
resistance source must be adjustable over the range desired for zero and full-
scale. All input types share the same wiring and procedure for calibration.
2.
Connect to One, Voltage or Current terminal of Each Output Channel:
Wire
output loads to the transmitter output appropriate for either current or
voltage, as required by your application. You will need to measure output
current or voltage accurately to calibrate the output. You could connect a
current meter in series with a load to read the output current directly, or a
digital volt meter in parallel with a load to measure output voltage.
Alternatively, you could simply connect a voltmeter across a precision load
resistor to accurately read output current as a function of the IR voltage drop
produced in the load resistor (recommended for current outputs).
3.
Connect Power:
Wire 6-32VDC power to the unit at TB5 as shown in the
Electrical Connections section. Optionally, you may wire power to the bus
terminal as shown in the optional power connections drawing. But in either
case, never exceed 36VDC peak, or damage to the unit may result.
Apply power to the transmitter before connecting to USB. You will not be able
to configure or calibrate the unit without power applied, as this device does
not draw power from its USB connection.
4.
Connect to PC via USB:
Connect the transmitter to the PC using the USB
isolator and cables provided in Configuration Kit TTC-SIP (refer to Accessories).
You may only omit the isolator if you are using a battery powered laptop to
connect to the unit, or your input 1 signal source is not already earth grounded
(USB ground and input 1 return share common).
Now that you have made your connections and applied power, you can
execute the DT335Config.exe software to begin configuration (software is
compatible with v7 or later versions of the Windows operating system).
Connect Inputs
Connect Outputs
Connect Power
Connect
PC/USB
Configure I/O