15
Preparations
P R E A M P 2
S E R V O ( L S - 1 0 C )
S E R I A L
P R E A M P 1
P R E A M P 1
P I C K U P
L O C K
I N P U T
C a b l e ( V P - 5 1 s e r i e s )
P r e a m p l i f i e r
C a b l e
( E C - 0 2 s e r i e s )
V M - 8 3 r e a r p a n e l
A c c e l e r o m e t e r
A C C / V E L
/ D I S P
H P F L P F
H O L D
R E S E T
M A X H O L D
O N / O F F
R H S
/ E Q
P E A K
/ E Q
P - P
P I C K U P
C a b l e ( V P - 5 1 s e r i e s )
V M - 8 3 f r o n t p a n e l
A c c e l e r o m e t e r
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 configured as a charge amplifier, 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
preamplifier is recommended.
Connection via a preamplifier
When the accelerometer is to be installed at a remote location, a preampli-
fier should be used to minimize noise and susceptibility to interference. The
preamplifier should be located close to the ac-
celerometer, and the longer cable run should be
between the preamplifier and the VM-83.
Use the cable supplied with the accelerometer
(VP-51 series) to connect the accelerometer to
the input of the preamplifier (VP-26A etc.).
Connect the output of the preamplifier to the
PREAMP 1 input connector on the VM-83, us-
ing a cable of the EC-02 series.
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