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Operating Manual
TM
Completion Resistor Installation
The model 142 is supplied with a 350 ohm completion resistor installed at the factory. This resistor can
be replaced by the user with another value if required to match that of the strain gage.
completion resistor
The leads of the completion resistor have been soldered to pads located on the top surface of the circuit
board at the factory. The user can replace the resistor by first removing the cover of the 142 which is
attached by four 0-80 cap screws. The user needs to follow standard industry practice in reflowing the
solder attachment using a soldering iron, cleaning residual flux, and taking the proper precautions for
ESD protection. Note that overheating the solder joints can damage the circuit. The leads of the
replacement resistor need to be formed and trimmed to fit the solder pads. Use the factory-installed
completion resistor as a template. The leads need not poke through the circuit board. The suggested
metal film resistor replacement is the Vishay Dale PTF56 series, ±0.1%, ±5ppm, 1/8W.
solder pads
completion resistor
Measurement Specialties, Inc.
www.meas-spec.com
+1 949-716-5377
32 Journey, Suite 150, Aliso Viejo, CA 92656 USA
8 of 11
t&m@meas-spec.com
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