Model DT333-0700
4-Wire mV/TC Dual Transmitter w/USB
Acromag, Inc. Tel: 248-295-0880
- 8 -
http://www.acromag.com
- 8 -
https://www.acromag.com
Output Connections
(To DC Current or DC Voltage
Terminals)
Outputs are short-circuit protected
from damage.
This transmitter is modeled after ANSI/ISA Type 4 transmitters in which unit power,
is separate from the input and output, except this unit includes two channels.
•
Output connections are polarized.
Tandem current and voltage output
terminals at each isolated output channel share an output return (RTN).
Current output is sourced from I Out+ and returned to RTN. Voltage
output is sourced positive at V Out+ with respect to RTN. Only one channel
output terminal (voltage or current) may be loaded at a time.
•
Variations in load resistance has negligible effect on output accuracy
when load limits are respected with respect to output type (see below).
Observe proper polarity. Note that twisted-pair wiring is often used to connect the
longest distance between each field transmitter output and the remote load as
shown above. Additionally, shielded twisted pair wiring is recommended for best
results. An output connection to earth ground at each output return will help
protect the circuit from damage in noisy environments.
WARNING:
For compliance to applicable safety and performance standards,
the use of twisted pair output wiring is recommended. Failure to adhere to
sound wiring and grounding practices as instructed may compromise safety,
performance, and possibly damage the unit.
TIP - Ripple & Noise:
Place additional capacitance at the load to help reduce the
60Hz/120Hz ripple sometimes present in industrial applications. For large 60Hz
ripple, connect an external 1uF or larger capacitor directly across the load to reduce
excess ripple. For sensitive applications with high-speed acquisition at the load,
high frequency noise may be reduced significantly by placing a 0.1uF capacitor
directly across the load, and as close to the load as possible.
