TB 9-4931-501-24
(4) Adjust calibration fixture POSITION control to align bright center trace of
display with TI center horizontal graticule line.
0.1 division of respective
(5) If center seven traces do not coincide within
horizontal graticule lines, perform b below.
(6) Press TI POWER switch to off and remove calibration fixture from left and
install in TI center compartment.
(7) Pull TI POWER switch to on and repeat (4) and (5) above and if necessary,
repeat b below for optimum gain setting compromise for both vertical compartments.
b. Adjustments. Adjust R175 VERT GAIN (fig. 4) for a 6 division deflection over
center seven horizontal graticule lines (R).
15. Vertical Compensation
a. Performance Check
(1) Press TI POWER switch to off. Remove calibration fixture from center and
install in TI left compartment. Pull TI POWER switch to on.
(2) Set calibration fixture TEST switch to VERT OR HORIZ + STEP RESP and
REP RATE switch to 100 kHz. Adjust AMPLITUDE and POSITION controls for a 6
division display centered vertically on TI graticule.
(3) Position time base controls as listed in (a) through (f) below:
(a) MAIN SEC/DIV switch to 2 s.
(b) VARIABLE control to CAL.
(c) AUTO TRIG switch in.
(d) AC COUPL switch in.
(e) POSITION control to center display.
(f) MAIN TRIG LEVEL control for a stable display, triggered on the rising
portion of the pulse.
(4) If pulse displayed does not have a flat top and square leading corner
(aberrations less than 0.36 division), perform b (1) through (4) below.
(5) Set calibration fixture REP RATE switch to 1 MHz.
(6) Set time base MAIN SEC/DIV switch to 0.1 and, adjust MAIN TRIG LEVEL
control for a stable display triggered on rising portion of the pulse.
(7) If pulse displayed on TI does not have a square leading corner and aberrations
are not less than 0.36 division, perform b (5) below.
(8) Press TI POWER switch to off and remove calibration fixture from left and
install in TI center vertical compartment. Set time base TRIG SOURCE switch to RIGHT.
(9) Pull TI POWER switch to on and repeat (2) through (7) above. If necessary,
compromise vertical compensation adjustments for TI left and center vertical
compartments.
b. Adjustments
(1) Adjust R121 (fig. 4) for optimum flat top on pulse displayed on TI screen.