Tektronix 2221 - Page 143

Appendix
A -
2221
Operators
HORIZONTAL
П
П
П
n
C
Equipment Required ( see Table A - 1 ) :
Calibration
Generator
(
Item
1
)
Leveled
Sine
-
Wave
Generator (
Item 2 )
Time
-
Mark
Generator (
Item
3
)
50
22
BNC
Cable (
Item 8 )
50 1
BNC
Termination
(
Item
12
)
INITIAL CONTROL SETTINGS
b . Select 50 ns time markers from the time - marker
generator
Vertical
П
П
П
П
C. Use the Channel 1 POSITION control to center the
display
vertically .
Adjust the
TRIGGER
LEVEL
control for
a stable ,
triggered
display .
Channel
1
POSITION
VERTICAL MODE
X -
Y
BW LIMIT
CH 1 VOLTS /
DIV
CH 1 VOLTS / DIV Variable
Channel 1 AC - GND - DC
Midrange
CH 1
Off
(
button
out
)
Off (
button
out )
0.5 V
CAL detent
DC
d . Use the Horizontal POSITION control to align the
2nd time
marker with the 2nd
vertical
graticule line .
Horizontal
POSITION
SEC / DIV
SEC / DIV Variable
X10
Magnifier
Midrange
0.05
us
CAL
detent
Off (
knob
in )
e . CHECK - Timing accuracy is within 2 % ( 0.16 divi
sion at the 10th vertical graticule line ) and linearity is
within 5 % ( 0.1 division over any two of the center eight
divisions ) .
NOTE
Trigger
VAR HOLDOFF
Mode
SLOPE
LEVEL
HF REJECT
INT
SOURCE
EXT COUPLING
NORM
P - P AUTO
OUT
Midrange
OFF
VERT MODE
INT
DC - 10
For checking the timing accuracy of the SEC / DIV
switch
settings from 50 ms
to 0.5 s , watch
the time
marker tips only at the 2nd and 10th vertical grati
cule lines while adjusting the Horizontal POSITION
control
.
Storage
f . Repeat parts
c
through
e
for the
remaining SEC / DIV
and time - mark generator setting combinations shown in
Table A - 5 under the " Normal ( X1 ) " column .
п
1 П
П
Л
п
П
П
STORE / NON - STORE
SAVE / CONT
TRIG POS
NON -
STORE (
button
out
)
CONT
POSTTRIGGER
( power
-
up
default )
OFF (
power
- up
default
)
ON (
power - up
default )
g
.
Set
:
DISPLAY ON / OFF
VECTORS ON / OFF
0.05
us
SEC / DIV
X10
Magnifier
On (
knob
out )
PROCEDURE STEPS
h . Select 10 ns time markers from the time - mark
generator
1. Check Timing Accuracy and Linearity
a . Connect the time - mark generator output via a 50
cable and a 50 2 termination to the CH 1 OR X input
connector
.
i . Use the Horizontal POSITION control to align the 1st
time marker
that is 25 ns
beyond
the
start of the
sweep
with the 2nd
vertical
graticule
line .
A
-
11
Л