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DS-2000 Frequently Asked Questions

Question number FAQ-0700

When connecting the acceleration pickup and observing the time waveform, it shows about 0.2 m/s² even though there should be no vibration. Why is that?

This is due to the offset in the circuit (the shift in the DC component). This value cannot be set to zero. However, this offset value can be reduced to less than 1/1000 of the voltage range by turning on auto-zero. For example, if the voltage range is 1 Vrms, the full-scale voltage is 1.41 V, so 1/1000 would be 0.00141 V (in the worst case).

At 0.00141 V, if you calibration the sensitivity of the acceleration pickup to 1.0 mV/m/ s², the acceleration will be displayed as 1.41 m/s ². When measuring small accelerations, try to use the lowest possible voltage range.

Last updated: 2008-01-21