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5. Load the Level Recorder with the desired recording paper. (Follow
instructions in Level Recorder Manual).
6. Select and insert required Range Potentiometer. (N.B. Place POTEN-
TIOMETER RANGE dB switch to »Standby" when altering potentio-
meters).
7. Switch POTENTIOMETER RANGE dB until figure corresponds to the
Range Potentiometer being used, i.e. "10",
"25", "50"
or
"75".
8.
By means of the switch RECTIFIER RESPONSE, select RMS or if
specially required one of the other three positions Average, Peak,
or DC.
9. Turn the LOWER LIMITING FREQUENCY switch to the cut-off
value (2, 10, 20, 50 or 200 Hz).
10. Set WRITING SPEED to required position.
(Full
explanations of items 8, 9 and 10 can be obtained from the
Level Recorder Manual).
11. Place REVERSE/FORWARD switch to "Forward".
12. Select PAPER SPEED to a suitable speed, e.g. 10 mm/sec.
13. Pull Gear-Lever marked "X" to the outer position. (See Fig. 3.3).
The actual paper drive speed now corresponds to the small numbers
marked around the PAPER SPEED knob.
14. Two types of recording can be made:-
(a) Single chart recording (automatic recording over a length of
250 mm paper only).
(b) Continuous recording over any length of paper.
(a)
Single Chart Recording:
Set the PAPER DRIVE toggle switch to
"start"
commencing
the paper to run, which will continue until the built-in auto-
matic stop switch declutches the drive mechanism (less than
than one chart length).
Reset recording paper by finger wheel
Z
(Fig. 3.3) until the
stylus rests on the 10 Hz line.
A chart of 250 mm length will now run off when the SINGLE
CHART- CONTINUOUS RECORDING pushbutton is pressed
and released again immediately afterwards.
(It
is possible to
stop the recording at any time by setting the PAPER DRIVE
toggle switch to "stop").
(b)
Continuous Recording:
The operator should follow the instructions outlined under
(a),
i.e. SINGLE CHART RECORDING, except that to start
the recording it is necessary to press the SINGLE CHART -
CONTINUOUS RECORDING push-button and turn it clock-
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