Ref.
Function
Name of Connector
Desig.
Index
J3
CHANNEL 3 Connector
Used to connect the channel 3 vibration transducer to the vibra-
19
tion meter.
J2
CHANNEL 2 Connector
Used to connect the channel 2 vibration transducer to the vibra-
20
tion meter.
J1
Used to connect the channel 1 vibration transducer to the vibra-
CHANNEL 1 Connector
21
tion meter.
EXT. METER
A telephone type jack (normally closed), used to connect an
J6
23
Connector
external dc meter in series with the vibration meter, The dc
meter used should have a value of 0 to 500 microamperes with a
resistance of not over 200 ohms. This connector may also be
used to connect external warning or control circuits of not over
200 ohms resistance. (The connector sleeve is negative, and
should not be grounded.)
GALV. Connector
J5
A telephone type jack (normally closed), used to connect an
24
external galvanometers to the vibration meter. The galvanom-
eters used should be of suitable sensitivity and frequency range,
and have an internal resistance of 100 ohms or less. Full scale
on the indicating meter M1 corresponds to approximately 555
microampere rms nominal in the galvanometers circuit. The
vibration meter controls will affect the galvanometer and
indicating meter M1 simultaneously. Meter M1 indications will
not be altered by the use of a suitable galvanometers.
Figure 1-21. Function of Electrical Connectors (Sheet 2 of 2)
c. Set the CHANNEL selector switch to the channel
TRANSDUCER/METER SYSTEM.
to be calibrated.
d. The vibration transducer maybe either connected
1-41. CALIBRATION WITH INTERNAL TEST VOLT-
or disconnected.
AGE. Normally, the vibration meter will be cali-
brated using the internal test voltage as follows:
e. Turn the OPERATION selector switch to posi-
tion C.
NOTE
f. Depress the CALIBRATE SIGNAL control and
rotate the control until the meter indication as read
If calibration by this means does not lead to
results which correlate with those obtained
o n the lower scale corresponds to the corrected
sensitivity in millivolts per inch per second, divided
when calibration is performed using alterna-
by 10 as calculated in step --
a.
tive methods, check the accuracy of the internal
calibration systems by the procedure described
g. Release the CALIBRATE SIGNAL control.
a. Divide the corrected sensitivity or the sensitivity
h. Adjust the meter to read full scale using the
SENSITIVITY control applicable to the channel in
of the transducer as indicated on the CEC calibration
which the vibration transducer is to be used.
certificate by 10.
b. Leave the INPUT NETWORK selector switch in
i. Calibrate each channel using a vibration trans-
ducer according to the procedures described in steps
any position.
