Model DT333-0700
4-Wire mV/TC Dual Transmitter w/USB
Acromag, Inc. Tel: 248-295-0880
- 11 -
http://www.acromag.com
- 11 -
https://www.acromag.com
Earth Ground Connections
The unit housing is plastic and does not require an earth ground connection. Internally, the inputs, each output, and
power circuits are electrically isolated from each other, allowing these circuits to be individually earth grounded as
indicated. Additionally, if the transmitter is mounted in a metal housing, a ground wire connection is typically required
for the enclosure and you should connect that metal enclosure’s ground terminal (green screw) to earth ground using
suitable wire per applicable codes. See the Electrical Connections Drawings for Inputs, Outputs, and Power, and note the
position of earth ground for each isolated circuit. Earth ground provides a safe destination for potentially destructive
transient energy in each isolated circuit, helping to prevent damage to circuitry, as circuit capacitors and transient voltage
suppressors steer towards the negative terminals of their circuits, where earth ground is normally applied.
•
Avoid inadvertent connections to earth ground at other points than those indicated, as this could drive ground
loops and negatively affect operation.
•
A USB isolator is recommended when configuring or calibrating a unit to avoid the ground loop that occurs if
your input is also earth grounded (A PC commonly earth grounds its USB port contacting both the USB signal and
shield ground which are held in common to the input circuit ground of this transmitter).
