HEWLETT-PACKARD 122A Repair Manual

Section V Model 122A/AR
Paragraphs 5-47 to 5- 52
b. Apply a 10-millisecond time marker to the Verti- q. Adjust C106 (see Figure 8-2) for equal spacing
cal Input terminals. of marker on first portion (4 markerdcm).
c. Adjust TRIGGER LEVEL control and choose 5-49. 50-ySEC/CM SWEEP ADJUSTMENT. (Use
either INT+ or INT- for best presentation. same test equipment as outlined in Paragraph 5-46. )
d. Adjust X1 Sweep Gain Adjustment, R107 (see a. Set the Model 122A/AR controls:
Figure 5-2),so that the markers coincide with every SWEEPTIME. .......... 50p SE C /CM
major division on the graticule (1 marker/cm). VERNIER.. ............... -CAL
5-47. X5 CALIBRATION ADJUSTMENT. (Use same SWPEXP.. ................ x1
test equipment as outlined in Paragraph 5-46. )
b. Apply 100-microsecond time marker signal to
a. Set SWP EXP to X5. Vertical Input terminals.
b. Apply 10-millisecond time marker signals to c. Adjust TRIGGER LEVEL :control for best
Vertical Input terminals. presentation
c. Adjust TRIGGER LEVEL control for best d. Adjust C225 (see Figure 5-2) for marker coin-
presentation. cidence with every other major graticule division
(1 marker/2 cm).
d. Adjust X5 Sweep Gain Adjustment, R108 (see
Figure 5-2), for 1 marker per 5 centimeters. 5-50. 0.5-MILLISEC/CM SWEEP ADJUSTMENT.
(Use same test equipment as outlined in Paragraph
5-48. SWEEP LINEARITY ADJUSTMENT. (Use
5-46. )
same test equipment as outlined in Paragraph 5-46. )
a. Set the Model 122A/AR controls:
a. Set the Model 122A/AR controls:
SWEEP TIME. * * - * 0.5 MILLISEC/CM
SWEEPTIME. - * * * * * * * - 10pSEC/CM VERNIER.. ............... CAL
VERNIER.. ............... CAL SWPEXP.. ................ x1
SWPEXP.. ................ x1
b. Apply 1-millisecond marker signal to Vertical
b. Apply a 10-microsecondtime marker signal to
Input terminals.
the vertical input terminals.
c. Adjust VERT SENSITIVITY, SYNC, and TRIG-
c. Adjust TRIGGER LEVEL control for best
GER LEVEL for best presentation.
presentation.
d. Adjust C223 (see Figure 5-2) for marker coin-
d. Adjust HORIZ POSITION control so last mark-
cidence with every other major graticule division
er on the trace is aligned with last graticule mark-
(1 marker/Z cm).
ing.
5-51. 50-MILLISEC/CM SWEEP ADJUSTMENT.
e. Adjust C226 (see Figure 5-2) so that last five
(Use same test equipment as outlined in Paragraph
markers coincide with every major graticule division
5-46 .)
(1 markgr/cm).
a. Set the Model 122A/AR controls:
f. Set R231, Sweep Length, to obtainapproximately
10 cm of sweep. SWEEP TIME. * - * * - 50 MILLISEC/CM
VERNIER. ................ CAL
g. Adjust C214 (see Figure 8-2) so that first five SWPEXP.. ................ x1
markers on the trace coincide with every major grati-
cule division. If necessary, adjust HORIZ POSITION b. Adjust VERT SENSITIVITY, SYNC, and TRIG-
control so that last marker on the trace is always GER LEVEL for best presentation.
aligned with last graticule marking. c. Adjust R251 (see Figure 5-2), 50 msec Adjust,
h. Change SWEEP TIME switchto 5pSEC/CM and for marker coincidence with every other major grati-
apply a 1-microsecond time marker to Vertical Input cule division (1 marker/cm).
terminals. 5-52. SWEEP LENGTH ADJUSTMENT. (Use same
i. Adjust VERT SENSITIVITY, SYNC, and TRIG- test equipment as outlined in Paragraph 5-46. )
GER LEVEL for best presentation.
a. Set the Model 122A/AR controls:
j. Adjust HORIZ POSITION control so that sweep
starts on left-hand graticule mark. SWEEP TIME - - - . - * 1 MILLISEC/CM
VERNIER.. ............... CAL
k. Adjust C 105 (see Figure 8-2) for equal spacing SWPEXP.. ................ x1
of markers onfirst portionof sweep(5 markers/cm).
b. Apply 1-microsecond marker to the VerticalIn-
m. Change SWEEP TIME switch to 20pSEC/CM
put terminals.
and SWP EXP to X5.
c. Adjust VERT SENSITIVITY, SYNC, and TRIG-
n. Apply 1-microsecond time marker signal to
GER LEVEL for best presentation.
Vertical Input terminals andadjust for best presentation.
p. Adjust HORIZ POSITION control so that sweep d. ALjUSt R231 (see Figure 5-2), Sweep Length,
starts on left-hand graticule mark. for 10.5 cm of sweep.
5-8 00081-4