Horizontal; Horizontal; Initial Control Settings; Procedure Steps - Tektronix 2205 Service Manual

Performance Check Procedure—2205 Service
Equipment Required (See Table 4-1):
Calibration Generator (Item 1)
Leveled Sine-Wave Generator (Item 2)
Time-Mark Generator (item 3)

INITIAL CONTROL SETTINGS

Vertical
POSITION (both)
MODE
VOLTS/DIV (both)
VOLTS/DIV Variable (both)
AC-GND-DC (both)

Horizontal

POSITION
MAG
SEC/DIV
SEC/DIV Variable
Trigger
SLOPE
LEVEL
MODE
SOURCE

PROCEDURE STEPS

1. Check Tim ing Accuracy and Linearity
a. Connect 50-ns time markers from the time-
mark generator via a 5 0 -a coaxial cable and a 50-11
termination to the CH 1
b. Adjust the Trigger LEVEL control for a stable,
triggered display.
c . Use the Horizontal POSITION control to align
the second time marker with the second vertical
graticule line.
4 -6

HORIZONTAL

Midrange
CH 1
0.5 V
CAL detent
DC
Midrange
XI
0.05 ms
CAL detent
Positive (_/")
Midrange
P-P AUTO
CH 1
X input connector.
or
50- a Coaxial Cable (Item 6)
50- f l Termination (Item 8)
d. CHECK—Timing accuracy is within 3% (0.24
division at the tenth vertical graticule line), and
linearity is within 5% (0.10 division over any 2 of the
center 8 divisions).
NOTE
For checking the timing accuracy of the SEC/
DIV switch settings from SO ms to 0.5 s,
watch the time marker tips only at the second
and tenth vertical graticule
adjusting the Horizontal POSITION controls
to line up the time markers.
e. Repeat parts b through d for the remaining
SEC/DIV and time-mark generator setting combi­
nations shown in Table 4-3 under " X 1 Normal"
column.
f. Set:
SEC/DIV
Horizontal MAG
g. Select 20-ns time markers from the tim e-
mark generator.
NOTE
The 20-ns time-markers tips are rounded off
and cannot be used as measurement refer­
ence points. Use the rising edge of the time
markers as measurement reference points.
Vertically adjust the 50% point of the time
markers on the center horizontal graticule
line.
h. Use the Horizontal POSITION controls to align
the first time marker that is 50 ns beyond the start of
the sweep with the second vertical graticule line.
lines while
0.1 (is
X I0