Add Mode And Ch 2 Invert Deflection Accuracy; Vertical Position Range (All Channels) - Tektronix 2246 1Y Service Manual

f. Move the test signal to the CH 4 input.
g. Set Vertical MODE to CH 4 (CH 3 off).
h. Position the trace two graticule lines below the
center horizontal graticule line.
i. Repeat CHECK for CH 4.
j. Set CH 3 and CH 4 VOLTS/DIV to 0.5 V.
k. Set calibration generator AMPLITUDE to 2 V.
. CHECK—the signal amplitude is between 3.92
l
and 4.08 divisions.
m. Set Vertical MODE to CH 3 (CH 4 off).
n. Move the test signal to the CH 3 input.
o. Repeat CHECK procedure for CH 3.
p. Disconnect the test setup from the 2246 1Y or
2246 Mod A.
11. ADD Mode and CH 2 INVERT Deflection
Accuracy
a. Set:
Vertical MODE
CH 1 and CH 2 VOLTS/DIV
CH 1 and CH 2 Input
COUPLING
b. Connect calibration generator STD AMPL output
to the CH 1 and CH 2 inputs via 50 f l precision
BNC coaxial cable and a BNC dual-input coupler.
c. Set the calibration generator AMPLITUDE to
0.2 V.
d. Position the ADD signal to the center of the crt
graticule with the CH 1 and CH 2 POSITION
controls.
e. CHECK—that the ADD
between 3.92 and 4.08 divisions.
f. Set CH 2 INVERT On.
h. CHECK—the ADD signal amplitude is 0.08 di­
vision (less than half a minor graticule division)
or less excluding trace width (sweep will free
run).
Performance Check Procedure—2246 1Y and 2246 Mod A Service
ADD (all others
off)
0.1 V
DC
signal amplitude is
g. Disconnect the test setup from the 2246 1Y or
2246 Mod A.
.

Vertical POSITION Range (all channels)

12
a. Set:
A SEC/DIV
CH 1 Vertical MODE
CH 1 VOLTS/DIV
CH 2 INVERT
SCOPE BW
CH 1 and CH 2 Input
COUPLING
Connect leveled sine-wave generator (SG 503)
b.
output to the CH 1 and CH 2 inputs via a 50 X T
BNC coaxial cable, a 50 f l BNC termination, and
a BNC dual-input coupler.
Position trace to center horizontal graticule line.
c .
Set leveled sine-wave generator output for two-
d.
division signal at 50 kHz.
e. Set:
CH 1 VOLTS/DIV
CH 1 POSITION
CHECK—that the bottom of the waveform is
f.
above the center horizontal graticule line.
Set CH 1 POSITION fully CCW.
g-
CHECK—that the top of the waveform is below
h.
the center horizontal graticule line.
Set:
i.
CH 1 POSITION
Vertical MODE
CH 2 POSITION
CHECK—that the bottom of the waveform is
J-
above the center horizontal graticule line.
k. Set CH 2 POSITION fully CCW.
CHECK—that the top of the waveform is below
the center horizontal graticule line.
m. Set CH 2 POSITION to 12 o 'clock.
n. Move the BNC dual-input coupler from the CH 1
and CH 2 inputs to the CH 3 and CH 4 inputs.
0.1 ms
On (ADD off)
1 V
Off
Off
AC
0.1 V
Fully CW
12 o 'clock
CH 2 (CH 1 off)
Fully CW
4-9