Model DT33x-0700
4-Wire DC I/V Dual Transmitter w/USB
Acromag, Inc. Tel: 248-295-0880
- 25 -
http://www.acromag.com
- 25 -
https://www.acromag.com
BLOCK DIAGRAM
How It Works
Key Points of Operation
-
Unit is DC powered and Isolated.
- Each input is Differential
- 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 using a
digitally isolated SPI bus. Each 16-bit output DAC drives separate voltage and
current terminals with a shared output return. Output ranges are user-
configured/scaled. Power to drive the input and output circuits is provided via an
isolated fly-back converter operating on input voltage wired to the power terminals
at TB5, or alternatively wired to optional bus power terminals along the DIN rail.
Setup involves selecting the input ranges, 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.
