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Performance
Check
and
Adjustment—7B87
INDEX
TO
PERFORMANCE
CHECK
AND
ADJUSTMENT
PROCEDURE
PAGE
A.
TRIGGERING
SYSTEM
1. Adjust
DC
Balance
and
Slope
Balance
(RB5,RBO) asics
ce cceenes
Check Triggering
Modes .
. Check
External
Level
Range .
. Adjust
Trigger
Sensitivity
(R49)
. Check
External
Triggering
Sensitivity
. Check
Internal
Triggering
Sensitivity ..
. Check
Internal
Trigger Jitter .
. Check
Line
Triggering
HORIZONTAL/AQS
SYSTEM
1. Set
Basic Sweep
Calibration...
2. Check Sweep Length and Posit
Registration
(R430,R445)
4. Check
Variable
Time/Division
and
Variable
Hold Off .
5. Adjust
ig
6.
Check
Internal
Clock Frequency
Ranges
. . . 5-11
7. Check
External
Clock Input .............665 5-12
8.
Adjust
Delay
Start and
Pickoff Bias
(R305,R530)..
9. Adjust DVM
Zero an
(R550, RE38) ssisccsssasiwsnacewcnsmesaais 5-12
10.
Adjust
10 ws and
10 ms Sweep
Timing
(R710,R715)
v¥
11,
Check
Delay
Time
Accuracy
v¥ 12.
Check
Sweep
Timing.......
v
v
13.
Check
Magnified
Sweep
Timing
14.
Check
Special
Readout
Encoding
VY Performance Requirement check; see introductory information.
5-4
PRELIMINARY
PROCEDURE
1.
Install
a 7A16A
Amplifier
unit
in the
left vertical
compartment,
and
a 7A19
Amplifier
unit
in the right
vertical compartment
of the oscilloscope
mainframe.
2. Install the 067-0580-00
plug-in
extender
in the
B
horizontal compartment
of the mainframe.
Remove
the
side covers and install the 7B87 in the plug-in extender.
3. Set the mainframe vertical mode switch to display the
left
vertical
unit
and
the
horizontal
mode
switch
to
display the B horizonal unit. Set the mainframe intensity
controls fully counterclockwise and set the trigger source
switches to vertical
mode.
4. Turn on the mainframe and allow at least 20 minutes
warmup
before
beginning the procedure.
NOTE
The performance
of this instrument can be
checked
at any
ambient
temperature
within
the
O°
to
+50°
C
range
unless
stated
otherwise.
This instrument must be adjusted
at an ambient temperature of +20° to +30° C
for
quoted
accuracy.
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