Model DT335-0700
Dual RTD/Resistance Input Transmitter w/USB
Acromag, Inc. Tel: 248-295-0880
- 9 -
http://www.acromag.com
- 9 -
https://www.acromag.com
Output Connections
(To DC Current or Voltage
Terminals)
Outputs are short-circuit protected
from damage.
Each transmitter channel is modeled after AN ANSI/ISA Type 4 transmitter with unit
power separate from the input and output.
•
Output connections are polarized.
Tandem current and voltage output
terminals at each isolated channel share a common return (RTN). Current is
sourced from I Out+ and returned to RTN. Voltage is sourced positive at V Out+
with respect to RTN. Only one channel output terminal (voltage or current)
may be loaded at one time.
•
Variations in load resistance have 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 output and its remote load as shown above
(shielded twisted pair wiring is recommended for best results). An output
connection to earth ground at each return will help protect the isolated output
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.