Rion VM-83, Инструкция по эксплуатации, Страница: 25 / 106

15
Preparations
Connecting the accelerometer
Note
Before connecting the accelerometer, turn power to
the unit OFF.
Piezoelectric accelerometer
Direct connection
Use the cable supplied with the accelerometer (VP-51 series) to connect
the accelerometer to the accelerometer input connector on the VM-83.
Because the input circuit is confi gured as a charge amplifi er, accelerometer
cable length has almost no effect on sensitivity.
However, a long cable may lead to an increase in
internal noise. The cable run should therefore be
kept as short as possible.
If the cable length exceeds 5 meters, the use of a
preamplifi er is recommended.
Connection via a preamplifi er
When the accelerometer is to be installed at a remote location, a pream-
plifi er should be used to minimize noise and susceptibility to interference.
The preamplifi er should be located close to the
accelerometer, and the longer cable run should
be between the preamplifi er and the VM-83.
Use the cable supplied with the accelerometer
(VP-51 series) to connect the accelerometer
to the input of the preamplifi er (VP-26A etc.).
Connect the output of the preamplifi er to the
PREAMP 1 input connector on the VM-83,
using a cable of the EC-02S series.