TB 9-4931-504-50
(3) Set CH1 VOLTS/DIV switch to .5 V, DELAYING SWEEP switch to 10 nS, and
DELAYED SWEEP SEC/DIV switch to 1 nS.
(4) Adjust TRIGGERING LEVEL control for stable display and adjust DELAY
ZERO (1st dot) control to aline cycle on second graticule line. If oscilloscope (A3) does
not indicate 4 cycles over center 8 divisions within 0.3 division, perform b below.
19. Risetime
a. Performance Check
(1) Connect pulse generator (A4) output to CH1 and CH2 INPUTS, using cable
supplied with pulse generator and adapters (B1 and B2).
(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 (1st dot) and DELAY TIME MULT (2nd dot) 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 (2nd dot)
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 (picoseconds), 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.
