Troubleshooting Guide 1

UNAMPLIFIED TRANSDUCERS

SYMPTOM/PROBLEM

ACTION

No Output

Verify correct wiring.

Verify excitation per calibration sheet.

Make sure pressure, load, etc. is being applied.

Check strain gage bridge for continuity.

Erratic/Intermittent

Check electrical connection for discontinuity or damage.

Output or Zero Drift

Check for isolation resistance between bridge wiring
and transducer body.

Make sure pressure, load, etc. is constant.

Check stability of excitation power supply.

Check millivolt output with voltmeter.

Check for RFI/EMI interference.

Make sure there are no rapid changes in temperature.

Incorrect Output

Check actual input and output resistance for possible change or open bridge.

Check zero offset to see if high.

High Zero Offset

Usually indicates transducer was over ranged beyond
specifications. Over ranged transducers should be
recalibrated.

Check actual input and output resistance measurements
for possible changes or open bridge.

TRANSDUCER WITH INSTRUMENT READOUT

SYMPTOM/PROBLEM

ACTION

Erratic Display

Check electrical connection and wiring code for pin layout.

No Display/No Output Voltage

Check power line fuse per instrument instructions.

Blinking Display

Indicated overload; make sure wires are all connected and
transducer is within its range.

Incorrect Readout

Check transducer range on label.

Verify that system was set-up per instructions. Review
set-up procedure.

Verify that transducer operates properly.

Use Resistor Shunt-Calibration to verify calibration when
integrated with Instrument Readout, or connect resistor
across (-) Excitation and (-) Signal. Refer to Certificate
of Calibration for correct resistor value.

Troubleshooting Guide For Load Cells