Instructions for troubleshooting for sensors with strain gauge
- Test the Sensor without amplifier by measuring:
- Measure the input resistance and compare the measured value with the value in data sheet; Measure the resistance between +Excitation and -Excitation; typical values of sensors with Straingages are 350Ohm, 1000Ohm, 370Ohm, 390Ohm, 700Ohm
- Measure the output resistance and compare it with the value in the data sheet; Measure the resistance between +bridge output and - bridge output; typical values of sensors with straingages are 350Ohm, 1000Ohm, 700Ohm;
- Measure the insulation resistance. Measure the resistance between bridge output and sensor housing. The resistance should be greater than 200 MOhm.
- Connect sensor to amplifier and switch on
- Supply voltage measured between +Excitation and -Excitation. Typical values are 2.5V or 5V or 10V or 8.75V
- Measire the differential voltage at the bridge output (select multimeters range "mV"). Typical values are -1mV to + 1mV. If a value of the order of 10mV is measured, then the sensor is probably overloaded. If a value of half the supply voltage is measured, then within the sensor is a cable break.