Advertisement
i
l
Performance Check Procedure - 067-1039-00
9.
Check Horizontal
Sync Width
(3 ..usec.
+/-
0.1 ..usec.)
a.
Set
the timebase to display
500 nsec/div.
timebase and adjust
the delay time multiplier
to
similar
to Fig.
4-5.
Activate
the delay
produce
a
display
-
--
-
-
...
--i--
~-· ~··
--
J
.,,
3986-06
3986-07
Fig. 4-4
Horizontal
Blanking Time
Fig. 4-5
Horizontal
Sync Width
b.
The 50% point
of the rise-
and fall-time
of the lower trace
should be 6 divisions
wide.
The tolerance
is+/-
1 minor division.
10.
Check TTL White Leyel
(Logic 1 greater
than 2.5 V)
a.
Disconnect
the cables from the PATTERN GENERATOR and turn off
the power to the TM 500 mainframe.
Remove the PATTERN GENERATOR from
the
mainframe,
remove
the
cover from the left
side,
and change the
jumper near the front
of the instrument
from TV to TTL (from
J390
to
J394).
Refer
to
Fig.
4-6.
Replace the left-side
cover and replace
the PATTERN GENERATOR
in the TM 500 mainframe.
Restore power.
b.
Change the two terminators
feedthroughs.
Change
the
cable
change the feedthrough
on the 7A13
TTL H SYNC output to the Main Trig
4-7
on
the
VIDEO output
to
50
ohm
to
the
7A13 to a 50 ohm cable and
to a 50 ohm type.
Reconnect
the
In of the oscilloscope
time base.
Advertisement
