Atec Tektronix-1502 - Manual (Page 51)

TM 9-4935-601-14-3&P
Adjustment Procedure
Figure 4-9. Time Marks Aligned (Metric).
(b). Check that the chart paper in the recorder has a bold line next to the hole in the paper that shows a
red line through the hole. If the red line is not aligned with a bold line on the chart paper, pull enough chart
paper through the recorder to line them up.
(c). Press the RECORD switch to obtain a recording of the time marks. The recording should show the
same timing as shown on the crt between the first and fourth time marks,
±
2%.
(d). Adjust-R3213 (H POS) and R3217 (HORIZ GAIN), located on the OUTPUT AMPS board, to match
the timing and position of the time marks on the crt to the chart recording.
72. (a). Adjust-R1435 (FT/DIV CAL) to align the time marks with every third graticule line (see Fig. 4-9).
(b). Set the METRES/DIV control to 50 and set the TG 501 to 1
µ
s. Check for 1 time mark every 3
divisions
±
2%.
(c). Set the METRES/DIV to 10 and set the TG 501 to .1
µ
s. Check for 2 time marks every 3 divisions
±
2%.
(d). Set the METRES/DIV to 5 and check for 1 time mark every 3 divisions
±
2%.
(e). Set the METRES/DIV to 2.5 and set the TG 501 to 50 ns.
If the timing is difficult to read due to noise, try pressing the NOISE FILTER
button or try a slight adjustment of the PG 502 Output (Volts).
(f). Set the METRES/DIV to 1 and set the TG 501 to 10 ns. Check for 2 time marks every 3 divisions
±
2%.
(g). Set the METRES/DIV to .5 and check for 1 time mark every 3 divisions
±
2%.
(h). Set the METRES/DIV to .25 and check for 6 divisions between time marks
±
2%.
(i). Set the METRES/DIV to 50, the METRES/DIV multiplier to X.1, and the TG 501 to 0.1
µ
s. Check
for 1 time mark every 3 divisions
±
1%. Locate the time marks by slight adjustment of the PG 502 Output
(Volts).
73. Adjust-C1332 (X.1 CAL) for 1 time mark every 3 divisions
±
1%.
DISTANCE Dial
74. (a). Set the METRES/DIV to 25, the METRES/DIV multiplier to X1, the TG 501 to .5
µ
s, and the
DISTANCE dial to 000. Locate a time mark on a graticule line by slight adjustment of the PG 502 Output
(Volts). Turn the DISTANCE dial clockwise until the second following time mark is aligned on the same
graticule line.
(b). Check-that the DISTANCE dial reads between 147 and 153.
(c). Check-the DISTANCE dial setting for no shift of the time mark with the ZERO REF CHECK button
is pressed.
75. (a). Set the DISTANCE dial to 150.
(b). Adjust-R1315 (DISTANCE CAL) located on the MAIN board, for no shift of the time mark while
alternately pressing and releasing the ZERO REF CHECK button.
76. (a). Set the TG 501 to 2
µ
s.
REV SEP 1983