Risetime

TB 9-4931-501-24

s and adjust R120 (fig. 4) for

(2) Set time base MAIN SEC/DIV switch to 1

optimum flat top on displayed pulse.

s and adjust R123 (fig. 4) for

(3) Set time base MAIN SEC/DIV switch to 0.5

optimum flat top on displayed pulse.

(4) Repeat (1) through (3) above as necessary to obtain optimum flat top on

displayed pulse.

(5) Adjust C637 (fig. 1) (main interface board between vertical compartments, serial

number B063251 and up), C115 (fig. 4), R115 (fig. 4), C155 (fig. 4), R155 (fig. 4), R167 (fig.

4), and C181 (fig. 4) for optimum pulse display on TI screen.

NOTE

There is interaction between C115 (fig. 4) and R115 (fig. 4), and

between C155 (fig. 4) and R155 (fig. 4). Readjust if required.

16. Risetime

NOTE

Perform paragraphs 17, 18, and 19 before performing

a. Performance Check

(1) Adjust calibration fixture AMPLITUDE and POSITION controls for a

convenient display centered on TI crt graticule.

(2) Position time base controls as listed in (a) through (c) below:

(a) MAIN SEC/DIV switch to .1 .

(b) SWP MAG switch in.

(c) MAIN TRIG LEVEL control for stab display.

(3) Measure risetime, using standard risetime technique. Risetime will be 4 ns or less.

(4) Press TI POWER switch to off. Move calibration fixture to TI left compartment.

Pull TI POWER switch to on.

(5) Press time base TRIG SOURCE LEFT switch and adjust MAIN TRIG LEVEL

control for stable display. Repeat (3) above.

b. Adjustments. No adjustment can be made.

17. Horizontal Centering

a. Performance Check

(1) Press TI POWER switch to off. Install calibration fixture in TI right

compartment and time base in left compartment.

(2) Position calibration fixture controls as listed in (a) through (d) below:

(a) POSITION control to midrange.

(b) AMPLITUDE control to midrange.

(c) TEST switch to COM MODE.

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