TB 9-6625-2059-35
12. Oscilloscope Alignment
a. Performance Check
(1) Position controls as listed in (a) through (d) below:
(a) MODULATION FREQ Hz switches to 01000.0.
(b) VAR control 1/4 turn cw from OFF position.
(c) FOCUS and INTENSITY controls for suitable display.
(d) DEV-VERT V/DIV switch to 6 kHz.
(2) Adjust-VAR control until TI oscilloscope displays 4 major divisions of vertical
deflection. Use HORIZ and VERT controls as required to center display.
(3) Adjust HORIZ control to align peak of first cycle with second vertical graticule
line. If at least nine cycles do not appear on oscilloscope display, perform b (1) below.
(4) Set DEV-VERT V/DIV switch to 1.5 kHz and adjust VAR control until
oscilloscope display amplitude is 1 major division. If oscilloscope display fails to stay in
sync, perform b (2) below.
(5) Set VAR control to OFF (detent).
b. Adjustments
NOTE
The adjustment in (1) and (2) below interact. Repeat as
necessary for best compromise.
(1) Adjust SWEEP CALA4A4R40 (fig. 1) until nine cycles are displayed (R).
(2) Adjust SWEEP CAL A4A4R40 slightly until display is synchronized (R).
13. Oscilloscope Timing and Bandwidth
a. Performance Check
(1) Set DEV-VERT V/DIV outer switch to 1.
(2) Connect oscilloscope calibrator SOURCE/MEASURE CHAN 1 to SCOPE IN,
using cable and 50 Ω termination.
(3) Press oscilloscope calibrator MARKER key and set for 1 ms output.
(4) Align fifth time marker on center vertical graticule line, using HORIZ position
control. If TI oscilloscope 6th marker does not align within 1 minor division, perform b (1)
below.
(5) Repeat technique of (3) and (4) above for switch setting listed in table 12. If TI
oscilloscope 6th marker does not align within 1 minor division, perform b (1) below while
adjusting for best in-tolerance condition on all ranges.
