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Adjustment Procedures
Factory Horizontal Cal
Equipment Required: One time mark generator (item
9),
one precision
coaxial cable (item
5),
and one 50 (2 termination (item 3).
Prerequisites:
CRT
adjustment procedure.
1.
Disconnect all signal inputs from the oscilloscope.
2.
Press the UTILITY button to display the Utility menu.
3.
Select CAL from the main menu.
4.
Select Factory Horizontal Cal, initiating the calibration routine.
This routine takes about
20 seconds to complete its initial calibrations.
Once complete,
2 dots are displayed and the message "Toggle
to
set
8div
about
center" appears. The displayed dots are used for the next
horizontal calibration steps.
NOTE
The
following steps use both the General Purpose Knob
and
the
TOGGLE button
to
make adjustments.
The
General Purpose Knob
performs two functions: to adjust horizontal gain
and
centering.
The
TOGGLE button selects the function
of
the General Purpose Knob.
5.
Use a combination of the TOGGLE button and the General Purpose
Knob to position the dots 8 divisions apart, centered horizontally (see
Figure 5-4).
6.
Select Done when you have the appropriate display.
:-.~.-
..
-
..
~.-
..
~.-
..
-
..
+.-.~
..
~.-
..
~.-
..
-
..
+.-
..
-.~
..
-·~·1-··-··1t---r-~
o
Dots Eight DiVIsions 0
Apart, Centered
+++<~~tH-+iII-=~"""=l
Horizontally 0
0%-
••••••••••••••••••••••••••••••••••••••
C1.EAII
MENU
,
l~@
000)
Gain
and
Position
Adjustment
Toggle Between
Gain
and
Position
Adjustment
Figure 5-4: Horizontal Adjustments
7.
Again, use a combination of the TOGGLE button and the General
Pur-
pose Knob to position the dots 8 divisions apart, centered horizontally
(see Figure 5-4).
TAS 475 and TAS 485 Service Manual
5-7
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