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Rectifier Response
PotentiOmeter Range
dB
Range Potentiometer
\
Paper Drive
Power
Fuse, Supply Voltage
Motor
Single Chart- Cont
.
Record
Event Marking
-
1'-"--+1--
-
Drive Shaft Speed
~~~~~~F:;;:;;,...______Remote
Control
.....,._______Two-Channel
Selector
......_____Drive Shaft
n
Finger Wheel Z
Fig. 3.3. Level Recorder Type 2305. Top view.
E. Automatic Recording.
By combining BFO Type 1013 and Level Recorder Type 2305, or using
Automatic Frequency Response Recorder Type 3306, it is possible to
automatically record the frequency response of four-terminal networks.
When using BFO Type 1013
and
Level Recorder 2305, it is necessary
to connect the two instruments mechanically by a Flexible
Shaft
UB 0041
as in Fig. 3.1 and to make the electrical connections also shown. Fig. 3.2
depicts the use of the Automatic Frequency Response Recorder Type 3306
with the required external connections.
For setting-up, calibrating and
synchronizing
the combination the follow-
ing procedure should be adopted:-
1. Ensure power supplies are correct and switch power toggles to the
"On" position. Set Level Recorder START/STOP
switch
to
"Stop".
2. Calibrate the B.F.O. as described in A.
3. Connect the instruments as shown in Fig. 3.1. This is done by
connecting a flexible driving
cable (UB
0041) to the upper driving
shaft of the Recorder
"Drive
Shaft I" located at the right-hand side
and to the front of the Level Recorder. Taking the other
end
of the
cable, insert and screw in drive on left-hand
side
of BFO.
(Check
engagement by switching the Level Recorder START/STOP switch to
"Start" and the BFO AUTOMATIC SCANNING to "On" and note if
scale rotates).
4. Switching PAPER DRIVE to
"Stop"
continue with the following
procedure referring Fig.
3.3.
17
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