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Fig. 5 3.
Lo cation o f high-voltage test p o in t and ad justm ent (right
side).
d.
C H E C K -V a ry the autotransformer o u tp u t voltage
throughout the regulating range fo r which this instrument is
wired and check for less than ±49 volts change in the high
voltage o utp ut level. Also set the INTENSITY control fu lly
clockwise at minimum line voltage and fu lly counterclock
wise at
maximum line voltage; check that regulation
remains w ith in given limits.
CAUTION
If a spot or trace appears on the screen when the
INTENSITY control is turned clockwise, position it
o ff the viewing area to protect the CRT phosphor.
a IN T E R A C T IO N -M ay affect operation o f all circuits
w ithin the Type 310A.
f. Disconnect the DC voltmeter.
5.
Check Low-Voltage Power Supply Ripple
a. Connect the IX probe to the test oscilloscope input
connector.
b. Set the test oscilloscope for a vertical deflection
factor o f 10 m illivolts/division, AC coupled, at a sweep rate
o f five milliseconds/division.
c. Connect the probe tip to the -1 5 0 -v o lt test p oint
(see Fig. 5-2A). Connect the probe ground lead to the Type
310A chassis near the test point.
d. CH EC K-Test oscilloscope display for less than one
division vertical deflection (10 m illivolts ripple) while
varying the autotransformer o utp ut voltage throughout the
regulating range fo r which this instrument is wired.
c Connect the probe tip to th e +100-volt test p o in t (see
Fig. 5-2A). Connect the probe ground lead to the Type
310A chassis near the test point.
Performance Check/Calibration— Type 310A
f. CHECK—Test oscilloscope display for less than one
division vertical deflection (10 m illivolts ripple) while
varying the autotransformer o utp ut voltage throughout the
regulating range.
g. Connect the probe tip to the +300-volt test p oint (see
Fig. 5-2A). Connect the probe ground lead to the Type
310A chassis near the test point.
h. C H E C K -T est oscilloscope display fo r less than four
divisions vertical deflection (40 m illivolts ripple) while
varying the autotransformer o utp ut voltage throughout the
regulating range fo r which this instrument is wired.
i. Return the autotransformer to the center voltage o f
the regulating range. (If the line voltage is near the center o f
the regulating range, the Type 310A can be connected
d irectly to the line; otherwise, leave the instrument con
nected to the autotransformer for the remainder o f this
procedure)
j. Disconnect all test equipment.
6.
Check/Adjust DC Balance
a.
Connect the vertical INPUT connector to one o f the
ground posts on the front panel w ith the 18-inch BNC-to
banana plug patch cord.
b. Turn the TRIG LEVEL and S T A B IL IT Y controls
fu lly clockwise.
c. Advance the IN TEN SITY control u ntil a trace is
visible. If the trace is not visible w ith the INTENSITY
control set near midrange, preadjust the DC Bal adjustment
to bring the trace on screen (VER TIC AL POSITION con
trol must be set to midrange).
d. Adjust the FOCUS control fo r as well-focused a dis
play as possible (trace may not focus well since the ASTIG
adjustment has not been performed yet).
e. Position the trace to the center horizontal line w ith
the V E R TIC A L POSITION control.
f. C H E C K -R otate the Variable V O LT S /D IV control
throughout its range. Trace should not move more than one
division vertically.
g ADJUST DC Bal adjustment, R344 (see Fig. 5 4),
fo r m inimum trace shift as the Variable VO LTS /D IV con
trol is rotated.
h. Return
the Variable V O LT S /D IV to the C A L I
BRATED position.
7. Check/Adjust Preset Stability
a. Set the Trigger Coupling-Mode switch to Auto.
5-9
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