Test & Measurement
and Refurbishment of Test
and Measurement Equipment
Chart Recorders
Oscilloscopes
Function Generators
Calibrators and Simulators

Faults, Errors, and Malfunctions

When test equipment is found out of tolerance, there is an uncertainty on all products and components for which it is measuring. To diagnose equipment out of tolerance, consult the unit’s statement of calibration, and perform interval tests on the measurement that appears to read incorrectly. For example, a voltmeter with a full scale range of 1000V should not read 1006V at full scale. Common calibration periods are one year, but tighter specification may call for maintenance every 90 days.

A meter or scope that fails to display an output could be the result of several problems. Internal circuitry (printed circuit boards, components) may require complete replacement. Multimeters are equipped with fuses to protect internal PCBs, check to see those haven’t blown.

A button or selector that fails to register can be the result of a wire or connection that is corroded or broken. Portable units may simply need a battery replacement or charge.