Check Position Range; Check Variable Range; Adjust 0.1-M S And 0.1 -Ns T Im Ing; Adjust High-Speed Timing - Tektronix 2205 Service Manual

f. Set the MAG switch from XI to X I0 position
and CHECK for no Horizontal shift in the time
marker..
g. Repeat parts c through f until no further
improvement is noted.

4. Check Position Range

a. Set:
SEC/DIV
Horizontal MAG
b. Select 0.1 ms time markers from the tim e-
mark generator.
c. CHECK—The start of the sweep can be
positioned to the right of the center vertical graticule
line by rotating the Horizontal POSITION control fully
clockwise.
d. CHECK—The tenth time marker can be
positioned to the left of the center vertical graticule
line by rotating the Horizontal POSITION control fully
counterclockwise.
e. Select 0.5 ms time markers from the tim e-
mark generator.
f. Align the 3rd time marker with the center
vertical graticule line using the Horizontal POSITION
control.
g. Set the Horizontal MAG switch to X I0.
h. Check—Magnified
positioned to the left of the center vertical graticule
line by rotating the Horizontal POSITION control fully
counterclockwise.
i. Check—The tenth
positioned to the right of the center vertical graticule
by rotating the Horizontal POSITION control fully
clockwise. "

5. Check Variable Range

a. Set Horizontal MAG switch to XI and center
the display.
b. Set the SEC/DIV Variable control knob fully
counterclockwise.
c. CHECK—The spacing between time markers is
2 divisions or less.
d. Return the SEC/DIV Variable knob to the CAL
detent position.
0.1 ms
XI
time marker can be
time marker can
Adjustment Procedure—2205 Service
6. Adjust 0.1-m s and 0,1- jis Tim ing (R722 and
C703)
a. Set the SEC/DIV switch to 0.1 ms.
b. Select 0.1-m s time markers from the tim e-
mark generator.
c. ADJUST—0.1-m s Timing (R722) for 1 marker
per division.
d. Set the SEC/DIV switch to 0.1 ps.
e. Select 0.1-p s time markers from the tim e-
mark generator.
f. ADJUST—0.1- jis Timing (C703) for 1 marker
per division.
7. Adjust High-Speed Timing (C783, C794)
a. Set:
Channel 1 AC-GND-DC
Horizontal MAG
b. Select 20-ns time markers from the tim e-
mark generator and set the display for maximum
amplitude within the graticule area.
c. Adjust the Trigger LEVEL control for a stable
triggered display,
d. ADJUST-HS Timing (C783 and C794) for two
divisions between each time marker.
The 20-ns time-markers tips are rounded off
&nd cannot be
reference points. Use the rising edge of the
time markers as measurement reference
be
points to adjust the high-speed timing
capacitors. Vertically adjust the 50% point of
the time markers on the center horizontal
graticule line.

8. Check Timing Accuracy and Linearity

a. Set:
CH VOLTS/DIV
Horizontal MAG
b. Select 0.1 -p s time markers from the tim e-
mark generator.
c. Adjust the Trigger LEVEL control for a stable,
triggered display.
AC
X I0
NOTE
used as measurement
0.5 V
XI
5-13