With the ▲▼ keys the displayed value can be increased or decreased, until it
amounts to 10.00 m/s². To save the setting press OK and exit the menu. By adjust-
ing the transducer sensitivity the instrument has now been calibrated. Check the cal-
ibration in the measuring mode. A vibration acceleration of 10.00 m/s² at 159.2 Hz
corresponds to a vibration speed of 10.00 mm/s s.
10. Sensor Check
The VM24 input is designed for use with a low power IEPE accelerometer. These
sensors are supplied by constant current, which produces a positive DC voltage po-
tential at the output. Due to this DC voltage an assessment can be made of the sen-
sor's operating condition. The VM24 detects three operational conditions:
< 0.1 V:
short circuit
0.1 – 11 V:
in working order
>11 V:
open input, e.g. broken cable
If a short circuit occurs or the input is open the instrument will display “SENSOR
ERROR” instead of the measurand.
11. Reset Key
If it occurs that the VM24 does not respond to the press of any button, press the re-
set key to restart the instrument. The reset key is reached with a thin object through
the aperture next to the type label (31).
Saved data and settings are not lost when the instrument is reset.
25
Figure 31: Reset key
