Tektronix 2221 - Page 151

Appendix A - 2221 Operators
A
П
П
3. Check External Clock
a .
Set :
b . Connect the digital voltmeter low lead to either
chassis ground or pin 9 ( signal ground ) of the X - Y Plotter
connector
.
Connect
the
volts lead
to pin 3 ( X
Output
) of
the X -
Y
Plotter
connector
.
CH 1 VOLTS / DIV
X - Y
SEC / DIV
1 V
Off (
button
out
)
1
ms
C. Set the digital voltmeter to the 20 V scale .
b .
Connect
the
Pulse Generator
output via a
50 12
cable and a
50 2
termination to CH
1 OR
X
input
connector ,
d . Press the AUTO PLOT button to activate the X - Y
Plotter
.
NOTE
C. Set the generator to produce a 1 kHz , 5 - division
display .
d .
Disconnect
the
cable
from
the
CH 1
OR X
input con
nector
and
connect
it
to the
BNC male - to -
tip plug via
BNC
female - to -
BNC
-
female
connector .
n
П
n
n
П
Voltage reading
of the X
Output will be
negative
left
of the
center vertical
graticule line and
positive
to the
right
of
it .
Voltage
reading
of Y
Output will be
nega
tive
below the
center
horizontal
graticule line
and
positive
above it
.
e . Insert the BNC male - to - tip - plug signal lead and
ground lead into pin 1 and pin 9 respectively of the X - Y
Plotter
connector
.
e .
Record the
voltage
as the
instrument plots
the 1st
and the
10th
graticule line ( as
the
intensity
spot
moves
along the graticule line ) .
f . Set
the
SEC
/
DIV
switch
to
0.1 sec .
f .
CHECK
-
The
voltage difference
between the 1st
and 10th graticule line is between 4.5 V and 5.5 V.
g .
Connect the
Calibration
Generator
high -
amplitude
output via a 50 N cable and a 50 2 termination to CH 1
OR X input connector .
h . Set the
generator
to
produce a 100
Hz , 5 -
division
display .
g . Press the AUTO PLOT button again to turn off
AUTO PLOT . Rotate the SEC / DIV switch to the next
lower or
higher sweep
speed to
abort the plot in
process
and reset the X - Y Plotter .
i .
Set :
ก
П
h . Move the volts lead of the voltmeter from pin 3 ( X
Output ) to pin 5 ( Y Output ) of the X - Y Plotter connector .
SEC
/
DIV
STORE
/
NON -
STORE
EXT
CLK
STORE (
button in )
i . Press the AUTO PLOT button .
j .
CHECK
-
The 100
Hz signal
is
displayed on the
screen
and
updated .
j . Record the
voltage as
the
instrument plots the top
and the
bottom
graticule line ( as
the
intensity spot
moves
along the graticule line ) .
k . Set the SAVE / CONT switch to SAVE .
1. CHECK - The
display is
saved .
k .
CHECK
-
The
voltage
difference
between
the
top
and bottom graticule line is between 3.6 V and 4.4 V.
1
m . Disconnect the test equipment from the instrument .
1.
Repeat
step
g
.
4. Check X - Y Plotter
a .
Set
:
m . Disconnect the test equipment from the instrument .
C
SEC / DIV
SAVE / CONT
0.1
ms
CONT
D
This completes the Performance Check Procedure .
A -
19