Service manual

50
Toggle or Pulse Modes
To check the transient generator in toggle and pulse modes, run the following program:
10 LOOP
20 OUTPUT 705;"TRAN ON;:TRAN:MODE TOGG''
30 DISP "TRAN:MODE TOGG"
40 PAUSE
50 OUTPUT 705;"TRAN:MODE PULS''
60 DISP "TRAN:MODE PULS"
70 PAUSE
80 END LOOP
90 END
During the pauses, use a logic probe to make the following checks:
Toggle Mode Pulse Mode
U349-3 = LO U349-4 = HI
U350-3 = LO U349-14 = toggling
U351-9, 11, 14 = LO U352-13 = toggling
U351-12 = HI
After the pause, press "Continue" to generate the next trigger.
CHECKOUT TABLE
RESULT
FRONT
use scope use logic probe
PANEL
ACTION
TRANS_EN
signal
U351-
11,12
U349-
2,12,15
U350-
3
U349-
7
U349-
17
U349-5,8,
11,16,19
U351-
17,19
Turn on
unit
TTL Lo 11=LO
12=Hi
Negative
pulse
every
0.5ms
Negative
pulse
every
0.01ms
TTL Lo TTL Hi
Press
TTL Hi 1KHz sq.
wave
Negative
pulse
every
0.5ms
Negative
pulse
every 10
µs
TTL Hi TTL Lo Positive
pulse
when
pressed.
Negative
pulse
when
pressed.
Press
TTL Hi 1KHz sq.
wave
Negative
pulse
every 5ms
Negative
pulse
every
100
µs
Negative
pulse
when
pressed.
Positive
pulse
when
pressed.
Positive
pulse
when
pressed.
Negative
pulse
when
pressed.
Press
TTL Lo 11=LO
12=Hi
Negative
pulse
every 5ms
Negative
pulse
every
100
µs
TTL Lo TTL Hi