Sensor Sensitivity; Basic Test With The A4801 Sensor Simulator; Basic Test With Sensor And Shaker - Adash 4900 - Vibrio M User Manual

sensor sensitivity

Before any calibration you need to
know what exact sensitivity of the
sensor is set in the instrument.
See the Power oFF screen, which contains
this information. Keep the middle button
pushed down and read the information.

basic Test with the A4801 sensor simulator

If you have the A4801 unit, you can regularly test the unit on two
frequencies - 80 Hz and 8 kHz.
On the initial screen RMS values of velocity and acceleration are
displayed. The velocity value should be 10 mm/s and the acceleration
should be 0.5 g.
The signal from the A4801 is adjusted for exactly 100 mV/g sensitivity.
When the sensitivity of the unit is e.g. 95 mV/g, then the higher values
(10.5 mm/s and 0.53 g) will be displayed. Expected values from the
A4801 should be multiplied by a 100/95 coefficient.
description of numbers on the switch off screen:
1. Firmware version
2. Serial number
3. HP filter frequency for bearings (0.5 kHz),
HP filter frequency for ISO (10 Hz)
4. Sensor sensitivity (100 mV/g)
The sensitivity of the sensor is usually in the 95 - 105 mV/g
range.

basic Test with sensor and shaker

The procedure should be the same as with the A4801.
Set 10 mm/s at 80 Hz on the shaker and check the RMS velocity
value on the initial screen. Then set 0.5 g at 1.2 kHz or higher and check
the RMS acceleration. Below 1.2 kHz the HP filtering is applied and the
result would be distorted.
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