Model DT335-0700
Dual RTD/Resistance Input Transmitter w/USB
Acromag, Inc. Tel: 248-295-0880
- 26 -
http://www.acromag.com
- 26 -
https://www.acromag.com
BLOCK DIAGRAM
How It Works
Key Points of Operation
-
Unit is DC powered with each
input, output, and power
Isolated.
- Supports 2, 3, or 4 wire sensor
connection.
- Each Isolated Output has both
current and voltage output
terminals.
- Input 1 circuit ground is common
to USB ground.
This dual transmitter uses a 32-bit microcontroller and two 24-bit A/D converters to
digitize each input channel and communicate to each isolated output DAC along
digitally isolated SPI busses. Each 16-bit output DAC drives separate voltage and
current terminals with a shared output return. Output ranges are user-
configured/scaled. Power for the input and output circuits is provided via an
isolated fly-back converter operating on voltage wired to the power terminals at
TB5 or wired to optional bus power terminals along the DIN rail. Setup involves
selecting the input types/ranges/wiring/break detection/units, selecting the output
ranges (current or voltage), selecting input filter levels, and scaling input range
endpoints to output range zero/full-scale endpoints. I/O scaling may be done in
reverse to produce a reverse acting output. Refer to the block diagram above to
gain a better understanding of transmitter operation.
