The TM-108 Test Monitor monitors a vibration acceleration signal and digitally displays the peak or rms acceleration and its corresponding displacement. The TM-108 compares the acceleration and displacement levels against the operating limits set and displayed on the front panel push wheel switches.

Acceleration or displacement higher than the upper limits will initiate a soft system shutdown via an optically isolated compressor circuit. After the set minimum test level of acceleration has been attained, an under-acceleration condition (loss of signal) will also initiate a soft shut down. Shut down will also be automatically initiated by a temporary or long term power line fault.

Immediate shut down can be further accomplished by the use of the emergency stop button provided on the front panel or through an external interlock fault loop (both normally closed and normally open) which allows protection by external process or test faults.