Wavetek 145 Instruction Manual page 54

6-18
PULSE GENERATOR
1 - - - - - _ _ . . i
BAD
NO
NO
i\10
NEG
PULSE
<
WITH APPROX
NO
110nsDELAY
FROM SYNC
AT IC11-8
?
YES
NO
NO
PLACE ALL CONTROLS
IN INITIAL POSITIONS,
EXCEPT PERIOD AT
0.5 X 1
µs,
PULSE WIDTH
AT 25 ns I 100 ns, PULSE
WIDTH VARIABLE AT
12 O'CLOCK, PULSE
MODE AT DOUBLE, PULSE
DELAY AT 50 ns I 100 ns,
VARIABLE AT
cw·
CHECK
GENERATOR OR
EXT SOURCE,
Pl-1 WIRING
CHECK
IC3, IC4 & +5V SUPPLY
CHECK
PULSE DELAY ONE-SHOT
IC10, IC11 & 016 - 018
CHECK
IC5, IC13, R1, SW3-A & SW5
CHECK
IC12&1C13
CONNECT SYNC OUT
TO FAST SCOPE;
USE HIGH IMPEDANCE
1-----~
X 10 PROBE TO CHECK
WAVEFORMS, SYNC
SCOPE ON NEGA"rlVE
(TRAILING) EDGE
CHECK
IC4, IC5, R1 (SIP), SW3-A & SW5
CHECK
IC4 & IC10
~IF
GENERATOR BOARD IS REMOVED, APPROX 1 MHz TTL MAY BE CON-
NECTED !-'ROM AN EXTERNAL SOURCE TO Pl-1 (SYNC) AND Pl-2 (COM)
Figure 6-9. Pulse Generator Checks, Trig/Pulse Board (Page 1 of 2)