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wise. Recording will now automatically take place until the
push-button is released again and the PAPER DRIVE,
START-STOP toggle switch is set to "stop".
Note: Whenever the PAPER DRIVE, START-STOP toggle
switch is in the "stop" position the paper drive is completely
controlled by the SINGLE CHART -
CONTINUOUS RE-
CORDING push-button.
15. In order to synchronise the units, stop the paper so that the stylus
rests on the lO Hz
line.
16. Adjust the commercing of the reference line on the paper to a suit-
able level, any necessary fine adjustment being made with the Input
Potentiometer.
17. Set tre pointer of the BFO on 10ooo Hz REFERENCE SIGNAL and
engage the magnetic clutch by use of the AUTOMATIC SCANNING
switch. The units should then be synchronised.
18. Push the 10ooo Hz REF. SIGNAL button. The BFO then generates a
signal of 10ooo Hz enabling the operator to select a reference signal
which is in the middle of the range. (This makes certain that when
taking a recording of frequency characteristics, where the lowest
attenuation is around 10ooo Hz, that the deflection of the stylus lies
within the scale limits of the paper during the recording).
Continuous Recording with Ten Times Enlarged Paper Speed.
The following method is adopted: Set the "Gear Lever X" (Fig. 3.3) in its
inner position (released). The actual paper drive speed then corresponds
to the large numbers marked around the PAPER SPEED knob. Recording
on frequency calibrated paper is not possible in this position.
The start and stop of the recording will in this case be completely con-
trolled by means of the PAPER DRIVE toggle switch.
F. Partial Blocking of Frequency Range.
The initial and/or the final part of the frequency range can be blocked by
means of the camdiscs mounted on the spindle of capacitor (Fig. 3.4). The
frequency range can be reduced to approximately one octave in any part
of the frequency range.
The blocking range is adjusted as follows:
1. Disconnected the instrument from the power supply line.
2. Remove rear plate of apparatus.
3. Loosen knurled lock-nut (Fig. 3.4) sufficiently for the outer and inner
cam disc to be moved relative to the one in the middle. Hold back
the dial knob.
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