TB 9-4931-504-40
19. Risetime
a. Performance Check
(1) Connect pulse generator output to CH1 and CH2 INPUTS, using cable supplied
with pulse generator.
(2) Position controls as listed in (a) through (f) below:
(a)
Press CH1, INT CH1, +SLOPE, and REP pushbuttons and release all others.
(b)
DELAY ZERO and DELAY TIME MULT fully ccw.
(c)
CH1 and CH2 VOLTS/DIV switches to 50 mV.
(d)
DELAYED SWEEP SEC/DIV switch to .1 nS.
(e)
TRIGGERING LEVEL control for stable display.
(f)
LOW NOISE pushbutton pressed.
NOTE
It may be necessary to adjust DELAY TIME MULT dial, DC
OFFSET, and TRIGGERING controls for proper pulse
presentation
(3) Measure risetime, using standard risetime technique. If risetime is not between
300 and 350 ps, perform b (l) below.
(4) Press CH2 pushbutton and repeat technique of (2) (e) and (3) above. If risetime
is not between 300 and 350 ps, perform b (2) below.
b. Adjustments
(1) Adjust channel 1 R20 (fig. 2) for a risetime between 300 and 350 ps.
(2) Adjust channel 2 R20 (fig. 2) for a risetime between 300 and 350 ps.
Figure 2. Test instrument - left-side view.
