MMF VM30-H, Инструкция по эксплуатации, Страница: 21 / 58

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Exposure sections with high RMS values or high shock components represent an elevated
health risk and shall be reported separately with magnitude and duration.
6. Switching the Instrument On and Off
To switch on the VM30-H, push the ON/OFF key and hold it for 2 seconds. The instrument
displays its software version and starts to display measuring values based on the last settings.
To switch it off, press again the ON/OFF key. Switching off by accidental key press can be
avoided with the key lock function. Press the LOCK key and confirm by OK to lock all keys.
The keys can be unlocked by pressing the LOCK key and OK again.
Please note that the VM30-H can only be switched off in the measuring mode. You must escape
from the data logger mode and the menus by using the ESC key before the unit can be switched
off.
If the shut-off timer was activated (MENU → “8/8: Device settings” → “2/6: Shut-off timer”),
the instrument switches off after 1, 10 or 30 minutes.
7. Sensor Input
The VM30-H is suited for the connection of all piezoelectric IEPE accelerometers which work
at a constant current of 2 mA. The relatively low supply current was chosen to save battery
power. The three built-in constant current sources have a compliance voltage of 20 V.
The input socket Model
Binder 711 (4 pins, female) is located at the front side of the case.
Figure 9: Pin assignment of the input socket (view from outside)
The VM30-H automatically recognizes the connected sensor by its bias voltage. The respective
channel is disabled if the bias voltage exceeds the limit of 19 V. Only the results of the other
channels will be displayed. If all three inputs are disconnected, the message “No sensor
connected.” is displayed. If a sensor is connected again, the display asks for the selection of the
sensor type (hand-arm or whole-body) .
The maximum input voltage is 6 V (peak-peak). At higher voltages the instrument switches
itself off.
16
GND
X
Y
Z