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Operating Manual
TM
Transducer Excitation
The amplifier offers two options for powering the desired transducer. A regulated 5.0 +0.0/-0.1 Vdc
supply is available on Transducer Pin 5. For other supply voltage requirements, Transducer Pin 1 should
be used which is the pass through power from the 5-30Vdc excitation source. This output is not regulated
and should be a clean supply to the transducer.
The wiring connection diagram is illustrated in the prior section.
Do not connect both Pin 1 and Pin 5 to the strain gage. Connect only one of the pins depending
on if the regulated 5Vdc power supply will be used or the pass through power from the excitation
source.
When using the 5Vdc regulated supply (Pin 5), the excitation voltage may need to be derated for a given
strain gage resistor value. The derating curve is illustrated below given an ambient temperature of 70°C.
For example, a 350 ohm strain gage (with matching completion resistor) cannot have an excitation
voltage applied to the 142 that exceeds 25.7Vdc.
There is no restriction on the pass through power (Pin 1).
Measurement Specialties, Inc.
www.meas-spec.com
+1 949-716-5377
32 Journey, Suite 150, Aliso Viejo, CA 92656 USA
10 of 11
t&m@meas-spec.com
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