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FIGURE 5-13. SLEWING SPEED DETERMINATION
FIGURE 5-14. X-AXIS SLEWING SPEED TEST SETUP
d. Apply 1 VDC to X input at beginning of a Y excursion.
e. Measurement is shown in Figure 5-13.
5-59. COMMON MODE REJECTION
5-60. DC REJECTION
a. Set RANGE switch to 1 mV/in. (0.4 mV/cm). Connect
input terminals with short between high (+) and guard, and 1K
Resistor between low (-) and guard.
b. Connect DC Standard between Y guard terminal and
ground.
c. Set DC Standard to 500 volts.
d. Pen will overshoot and settle to a level not It exceed
0.16 inch (4.0 mm) from initial position on chart.
e. Repeat at all fixed attenuator positions for Y inputs.
f. Repeat test for X-axis. Pen deflection is same.
CAUTION
Before removing input leads, reduce
signal to zero.
5-61. AC REJECTION
a. Set RANGE switch to 1 mV/in. (0.4 mV/cm). Connect
the 1k ohm resistor between the high (+) and low (-) terminals,
and a short between the low (-) and guard terminals.
b. Pen deflection shall not exceed 0.1 inch (2.54 mm)
with pen in any position on paper.
c. Set Function Generator to 10 V peak-to-peak sine
wave and sweep frequency ±3 Hz around line frequency.
d. Pen deflection shall not exceed 0.2 in. (5 mm) with
pen at any position on paper.
e. Repeat at all fixed attenuator positions for Y inputs.
f. Repeat test for X-axis. Pen deflection is same.
5-62. MECHANICAL ADJUSTMENTS
5-63. PROCEDURE
5-64. Any adjustment to the instrument is deemed necessary
only when it is determined the instrument is out of adjustment
per specifications, but not malfunctioning due to component
failure.
5-65.
Y-AXIS
DRIVE
ADJUSTMENT
5-66. The Y cable tension may be verified by measuring the
force required to move the pen carriage downscale while the
motor is locked. This required force shall be between the limits
of 6 ounces and 12 ounces. To perform the procedure, it is
necessary to first remove be rear hood and platen.
procedure is shown in Figure 5-15.
5-67. If the string tension is not correct, the string must be
lengthened or shortened to attain the desired tension. This
can be accomplished by removing the pen block from the pen
arm and retying the knot on the end of the string.
paragraph 5-42.
STRING
TENSION
CHECK/
The
See
5-9
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Troubleshooting
