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66
b)
SINGLE CHART RECORDING
1. With the Type 2305. For automatic recording over one 250 mm
chart length, the GEAR LEVER should be in the "Out" position,
and the paper speed may be selected according to the small figures
around the PAPER SPEED selector.
To start the paper moving, first set the PAPER DRIVE switches to
"Start" and "Forward". Then depress the Sl NG LE CHART
I
CONT. RECORD push-button and release after the chart has
travelled at least 40 mm. The paper will continue to move, but will
stop automatically after one chart length or less. The second
recorded chart (after realigning the paper to the start of its sweep)
will be 250 mm in length.
2. With the Type 2307. For automatic recording over one 250 mm
chart length, the PAPER SPEED switch should be in the "mm/sec"
position, and the paper speed may be selected according to the
figures around the PAPER SPEED selector.
To start the paper moving, first set the PAPER DRIVE FUNC-
TION selector to "Automatic stop F" and then press the "PAPER
DRIVE, Start" button. The paper travels for one chart length and
is then stopped automatically.
6. Once the paper has stopped adjust the Finger Wheel so that the stylus
coincides with the reference line to be used. To remove backlash in
the paper drive, the paper should be moved so that it approaches the
correct position in the reverse direction (i.e. towards the recorder).
For example, if the paper is to be shifted to a higher frequency, the
chart is first moved forward to a position beyond the desired point
and then reversed to the correct position.
7. Position the SWEEP CONTROL selector of the 2010 on "Manual"
and select the range for analysis on the FREQUENCY SCALE
selector. If the mechanical drive is used, position the frequency
scale.
pointer on the appropriate starting frequency, as indicated on the
Level Recorder paper. Position the SWEEP CONTROL selector on
"Ext. Mech.".
If the electrical drive from the 2307 is used, it is necessary to position
the scale pointer of the 2010 in the passive zone. In this case the
position of the paper in the Level Recorder determines the analysis
frequency. Position the SWEEP CONTROL selector on "Ext. Volt."
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