Section VI Model 166D. MX-2962/USM-i05A
Paragraph 6-4
6C REPAIR
6-4. ADJUSTMENT PROCEDURES. c. TRIGGER SYMMETRY
a. INTRODUCTIOX. - The procedures below give (1) Connect oscillator output to oscilloscope verti-
instructions for the complete calibration of the Model cal INPUT and set vertical SENSITIVITY to 10 v/cm.
166D. Table 6-1 lists the test equipment required for
(2) Set oscillator frequency for 1 kc and adjust out-
calibration. Table 6-6 lists the adjustments required put amplitude for 2 mm deflection.
following replacement of individual tubes, transistors,
and diodes. (3) Set Model 166D controls as in paragraph b (2).
Note (4) Connect junction of R7 and S2 to ground with
clip lead.
The delay time accuracy of the Model 166D
depends on the + 110 and - 100 voltages sup- (5) Adjust TR Sym R16 (figure 6s1) to give trig-
plied by the oscilloscope. These voltages gered sweep.
should be adjusted to their nominal values (6) * Remove clip lead and adjust TRIGGER LEVEL
*0.4% before adjustments are made. Refer
for triggered sweep.
to the oscilloscope Operating and Servicing
Manual for adjustment procedure. (7) Set TRIGGER SLOPE to -; sweep should remain
triggered.
b. PRESET. d. SWEEP LENGTH.
(1) Connect DC Voltmeter between pin 3 and V13A
(1) Connect oscillator output to oscilloscope vertical
and ground,
INPUT; adjust frequency to 600 kc and amplitude for
5 cm deflection.
(2) Set Model 166D controls as follows: (2) Set Model 166D controls as in paragraph b (2).
TRIGGER SLOPE. ............... +. (4) Adjust TRIGGER LEVELto give shortest sweep
possible.
TRIGGER SOURCE. ............. INT
SWEEP MODE ............. PRESET (5) Adjust Swp Lnth (figure 6-1) for sweep length
DELAYING SWEEP TIME. . SMILLISECONDS of 10.2 cm.
SWEEP SELECTOR. .... DELAYING SWEEP
e. DELAYING SWEEP CALIBRATION.
(1) Connect Time Mark Generator to oscilloscope
(3) Rotate SWEEP MODE to FREE RUN, then back and set controls as shown in table 6-3.
toward PRESET until sweep just stops. Observe read-
ing on voltmeter for reference. (2) Table 6-5 lists adjustments and tolerances for
each range of DELAYING SWEEP TIME. Align 1st
(4) Set SWEEP MODE to PRESET and adjust Pre- marker with left side of graticule using HORIZONTAL
set R60 (figure 6-1) to give reading 1.5 volts more POSITION control. Align llth/2lst marker with right
positive than reference. side of graticule with adjustment listed in table 6-5.
Table 6-5. Sweep Calibration
-
Delaying Sweep Time Mark
Time/CM Generator Action * Tolerance A
5 usec 5 usec adjust C36 1 marker/cm
10 usec 10 usec check 1 mm
2 usec 1 usec check 1 mm
50 usec 50 usec adjust R92 1 marker/cm
. 1 msec ..lo0 usec check 1 mm
20 usec 10 usec check 1 mm
.5 msec .500 usec adjust R91 1 marker/cm
1 msec 1 msec check 1 mm
.2 msec .lo0 usec check 1 mm
5 msec 5 msec adjust R90 1 marker/cm
10 msec 10 msec check 1 mm
3. msec 1 msec check 1 mm
.l sec .lo0 msec adjust R89 1 marker/cm
50 m'sec 50 msec check 1 mm
20 msec 10 msec check 1 mm
.2 sec .lo0 msec check 3 mm
.5 sec .SO0 msec check 3 mm
.1 sec 1 sec check 3 mm
*These tolerances do not apply after setting DELAYING SWEEP TIME accuracy (step4 inparagraph6-4h).
6-4 I 01227-1 |
ACEC
HEWLETT-PACKARD
