Appendix
C:
Performance Verification
SECIDIV
Variable
XI
0
Magnifier
B
DELAY TIME POSITION
B
Trigger
SLOPE
LEVEL
A Trigger
VAR
HOLDOFF
Mode
SLOPE
LEVEL
A
&
B
SOURCE
A COUPL
A EXT COUPL
Storage
STOREINON-STORE
CAL
detent
Off
(knob in)
Fully counterclockwise
Positive (button out)
Fully clockwise
NORM
P-P AUTO
Positive (button out)
Midrange
VERT
MODE
NORM
DC
NON-STORE
(button
out)
Procedure Steps:
Step
1: Check Timing Accuracy and Linearity
a. Connect the time-mark generator output via a 50
fl
cable and a
50
fl
termination to the
CH
1
OR
X input connector.
b. Select 50 ns time markers from the time-marker generator.
c. Use the
CH
1
POSITION
control to center the display vertically.
Adjust the A Trigger
LEVEL
control for a stable, triggered display.
d. Use the Horizontal
POSITION
control to align the 2nd time marker
with the
2nd vertical graticule line.
e. CHECK
-
Timing accuracy is within
2%
(0.1
6
division at the
loth
vertical graticule line), and linearity is within 5% (0.1 division over
any 2 of the center eight divisions).
f.
Repeat parts c through e for the remaining
A SECIDIV
and time-
mark generator setting combinations shown in Table A-1
1
under the
Normal
(XI)
column.
When checking the timing accuracy of the
A SECIDIV
switch set-
tings from 50 ms to 0.5 s, watch the time marker tips only at the
2nd
and
1
oth
vertical graticule lines while adjusting the Horizontal
POSI-
TION
control.
g. Set:
A SECIDIV
0.05 ps
XI
0
Magnifier
On (knob out)
h. Select 10 ns time markers from the time-mark generator.
A-38
Appendices
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