BRUEL & KJAER 2305 - Operation

Power Supply. The drive system of the Turntable can be delivered for two
line frequencies of 50 or 60 Hz (cis) re spec tively (specify when ordering).
Alteration of the drive system from 50 Hz (cIs) to 60 Hz (cis) line frequency
or vice versa can be accomplished by changing th e nylon gear wheels similar
to those in the Level Recorder (refer p age 37 ).
OPERATION
t\. Start and Stop Control Cable.
The 3-cored cable to be used between Turntable and Level Recorder is
mounted according to Fig. 4.6b. The figure shows the connections to be
made between the respective jacks on the Turnt ab le an d Recorder but
illustrates also the wiring to be made to the respective plugs delivered
with the Turnt ab le, presuming the figure shows the plugs seen from
the soldering point side.
B.
Setting to Correct Supply Voltage.
Check on the Turntable (bottom) that the power supply voltage selector
is set to the proper voltage. If not, remove the fuse and turn the middle
portion of the combined fuseholder and selector until the white mark
rests oppos ite the desired vo ltag e. Replace the fuse and sw itch MOTOR
to " On". The table plate should commence to rotate when the Turntable
is connected to the mains .
C. Set-np.
48
t. Set Level Recorder control knobs as follows:-
POTENTIOMETER RANGE accord ing to the Range Potentiometer em-
ployed .
RECTIFIER RESPONSE, LOWER LIMITING FREQUENCY and
WRITI NG SPEED to values suitable for the m easureme nt. See also
Fig. 2.2 on page 24 .
POWER and MOTOR to "On".
PAPER DRIVE to "S tart " and "Forwa rd" .
PAPER SPEED to "10" ( large figure indication).
Gear Lever X to inner position .
Other control knobs can lIe left at random .
2.
Connect the Level Recorder to the Turntable Type 3921 according to
Fig . 4.6a and b. The table should stop automatically after one revolu-
tion or less, (the electromagnetic clutch declutches the motor) assuming
that the special plug delivered with the Turntable is inserted in the
REMOTE CONTROL j ac k. -
3.
Place the object to be investigated on the table and wire it up via the
jack TABLE INP UT on the base panel. The termination of this is a