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DR4300 Circular Chart Recorder
188 DR4300 Circular Chart Recorder Product Manual 12/03
8.6 Alignment of Pen at Zero and Span
Introduction
If the pen trace does not track at the correct chart increment with a known input value, you can use the
following procedure to adjust the pen travel at zero and span (full scale) to compensate for the effects of
humidity on the chart size.
If the recorder has 2 pens, be sure Input1 (INP 1) is on the display. If it is not on display, press FUNC
key to toggle input for display.
Procedure
Follow the procedure in Table 8-15 to align the pens.
Table 8-15 Procedure for Aligning Pen at Zero and Span
Step Press Action/Result
1
SET
UP
until you can see:
ALIN
Upper Displa
y
PEN
Lower Displa
y
2
FUNC
until you can see:
(value)
Upper Displa
y
(approximately 60 on the upper display)
PEN0
Lower Dis
p
la
y
Wait until pen stops moving downscale.
If the pen tip is greatly out of position, follow Steps 3 through 7. (Unless a pen arm has been
replaced, this probably will not be necessary.) If pen position requires only minor adjustment, go to
Step 8.
3
Turn off the power to the recorder.
4
To place the pen tips in approximately the correct position, loosen the screw
holding the pen 1 (purple) arm to the servo shaft and move the pen arm to
access the locking screw for the pen 2 (red) arm (if applicable).
5
Align the tip of pen 2 with the zero line on the chart and tighten the locking
screw.
6
Align the tip of pen 1 with the zero line on the chart and tighten the locking
screw.
7
Turn on the power and repeat Step 2.