Display; Trace Rotation; Geometry; G Eo M E Try - Tektronix 2246 1Y Service Manual

Equipment Required (See Table 4-1)
Tim e-m ark generator
50 f l BNC termination

1. TRACE ROTATION

a. Set:
READOUT (Intensity)
A INTEN
Vertical MODE
CH 1 VOLTS/DIV
CH 1 COUPLING
A/B SELECT
Trigger MODE
Trigger SOURCE
Trigger CPLG
Trigger SLOPE
Trigger HOLDOFF
Trigger LEVEL
Horizontal MODE
Horizontal POSITION
A SEC/DIV
Measurements
FOCUS
SCOPE BW
b. Position trace vertically to the center graticule
line.
Performance Check Procedure—2246 1Y and 2246 Mod A Service

DISPLAY

c. CHECK—trace rotation control range is adequate
to align trace with center graticule line using a
small straight-bladed alignment tool.
d. ADJUST—trace
For a viewable
graticule line.
readout
For a viewable
trace

2. Geometry

CH 1
a. Connect tim e-m ark generator (TG 501) to CH 1
0.1 V
via a 50
AC
termination.
A Trigger
AUTO LEVEL
b. Set generator for 0.2 p.s time marks.
VERT
DC
c. Position the bottom of the CH 1 signal below the
-j~ (positive)
bottom graticule line.
Min
d. CHECK—deviation of any vertical line within the
12 o 'clock
center eight horizontal divisions does not exceed
A
0.1 division (half a minor division).
12 o ' clock
2 |xs
e. Set CH 1 COUPLING to GND.
All off (Dress
CLEAR
f. Position trace slowly from the bottom graticule
DISPLAY three
line to the top graticule line while making the fol­
times)
lowing check.
For best
defined display
g. CHECK—bowing or tilt of baseline trace doesn't
Off
exceed 0.1 division (half a minor division) within
the eight vertical divisions.
h. Disconnect test signal from the 2246 1Y or 2246
Mod A.
50 f l BNC coaxial cable
parallel to
BNC coaxial cable and a 50 f l BNC
center horizontal
4-5