TB9-6625-2131-24
(21) Check crt display at each time base sweep rate switch settings listed in table 4.
If aberrations on displayed pulse exceed 0.15 division, or if total peak-to-peak aberrations
exceed 0.2 divisions, perform beam 1 adjustments listed in table 4 for optimum pulse
response.
Table 4. Horizontal System High-Frequency Compensation
Test instrument
Adjustments
Time base
(R)
Area of maximum
TIME/DIV
effect
A19 BEAM 1
A20 BEAM 2
switch settings
1 and 62)
(figs. 51 and 62)
(figs. 5
5 ns/div3
C1904
C2904
5 ns/div timing
(C4850)
(C5850)
C1934
C2934
(C4860)
(C5860)
2 ns/div
C1862
C2862
2 ns/div timing
1 ns/div4
R1860
R2860
First half of sweep
2 ns/div
R1870
R2870
2 ns/div linearity
1 ns/div4 5
R1873
R2873
Last half of sweep
(C4823)
(C5823)
Figure 5 is for type 7844 with SN B109999-below and type R7844 with SN B099999-below.
2Adjustments
in parentheses (fig. 6) are for type 7844 with SN B110000, and type R7844 with SN B100000-above.
3Interaction exists between 5 ns and 2 ns adjust. Repeat for best compromise for type 7844 with SN B110000-above and type
R7844 SN B10000-above.
4Lin A and lin B adjustment primarily affects 1 ns timing, but also affects 2 ns timing to a lesser degree.
5Effect of adjustment not noticeable with sweep rates below 1 ns/div.
(22) Remove standardizer from LEFT VERT compartment and install in RIGHT
VERT compartment.
(23) Set B TRIG SOURCE and VERTICAL MODE switches to RIGHT.
(24) Adjust BEAM 1 INTEN control fully ccw, and BEAM 2 INTEN control for
suitable display on crt.
(25) Repeat (20) through (22) above for beam 2.
b. Adjustments. No further adjustments can be made.
13. Vertical Centering
a. Performance Check
NOTE
Steps (1) through (14) below pertain to TI's without option 21
and (15) through (23) below for TI's with option 21.
(1) Install time base in A HORIZ compartment and standardizer in LEFT VERT
compartment.
(2) Position controls as listed in (a) through (d) below:
BEAM 1 INTEN control to midrange.
(a)
BEAM 1 VERTICAL MODE1 switch to LEFT.
(b)
BEAM 1 and 2 HORIZONTAL MODE switch to A.
(c)
BEAM 2 INTEN control fully ccw.
(d)
