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3. RECTIFIER RESPONSE to "RMS".
4. LOWER LIMITING FREQUENCY to
"20
Hz".
5. WRITING SPEED:
160 mm/sec (large figures) with 50 mm paper, or 315 mm/sec (small
figures) with 100 mm paper.
6. PAPER SPEED to "3 mm/sec"
(small
figures).
7. Set the Synchronizing Gear Lever X in its outer position. Make sure that
the Lever is pulled completely to the out position by moving the
grooved finger wheel Z to and from at the same time as pulling. (The
actual paper drive speed now corresponds to the small figures marked
around the PAPER SPEED knob). See Fig. 2.2.
z
X
Drive
Shafts
p1
s
Fig. 2.2. Front and side view of the Level Recorder Type 2305.
8. PAPER DRIVE to
"Start"
and "Forward" commencing the paper to run,
this will continue until the built-in automa,tic single chart stop switch
declutches the drive mechanism (one chart length or less).
9. By means of the finger wheel Z (Fig. 2.2) adjust the paper until the
recorder stylus is on the mark 20 Hz of the pre-calibrated recording
paper.
10. Lower the pen.
Adjust the knob OUTPUT LEVEL on the Beat Frequency Oscillator until
a sound pressure level of 100 dB in the Coupler can be measured on the
Microphone Amplifier.
By means of INPUT POTENTIOMETER and INPUT ATTENUATOR of the
Level Recorder, the deflection of the pen is adjusted to the 40 dB line of
the recording paper.
13
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