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Vibration meter - 10 - 100 mV/g | 4190
The Dytran model 4190 provides the front-panel mounted “Bias-Test” push-button. When this switch is depressed, the front panel meter displays the voltage bias of the IEPE accelerometer connected to the 4190. This voltage, which may vary dependent on the IEPE accelerometer chosen, will be in the range of 9 to 12 Volts DC for normal operation. This verifies that the accelerometer is powered and is behaving normally. Compare this reading with the manufacturer supplied data sheet for the bias voltage supplied by the two batteries, in series (approximately 18 VDC). Additional circuitry provides low battery indication in the form of a red LED on the front panel and a “Normal Operation” green LED which indicates that the accelerometer is connected and is performing normally.