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Operating Manual
TM
Humidity Protection
For model 140 amplifier has an ingress protection rating of IP50 (dust protection). It is not designed to be
used in any wet environments.
For installation in environments that could be subjected to falling water, it is recommended to install a
protective shrink sleeving around the housing of the amplifier. Temporary potting of the gain setting and
auto-zero cavities with silicone RTV are also recommended to provide additional protection. The mating
connectors will also need to be properly protected from falling water with adhesive and shrink sleeving.
Cable Attachment
The model 140 amplifier incorporates two Binder connectors mounted on each side of the housing. For
reliable operation it is recommend that a small amount of thread locking compound is used to secure the
connector plug during testing.
The cable assembly should also be properly secured at regular intervals during testing. It is
recommended to use clamps, wax, or tape to secure the cable to minimize cable motion that can add
noise to the output signal. The initial attachment should be within two to three inches of the amplifier with
some slack in the cable to prevent tension at the connector joint
Avoid routing cables near high-voltage wires and also ground the shield at the data acquisition to
minimize ground loops.
Calibration
A calibration certificate is provided with each model 140 that presents the actual gain at each gain
setting, and the actual values for the 5Vdc regulated supply output and the 2.5Vdc reference output. The
calibration cycle is one year.
Measurement Specialties, Inc.
www.meas-spec.com
+1 949-716-5377
32 Journey, Suite 150, Aliso Viejo, CA 92656 USA
6 of 9
t&m@meas-spec.com
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