2212 Service Manual
Performance Tests
Procedure Steps
Step
1. Check Non Store Timing Accuracy
a.
Connect
50
ns time markers from the time-mark generator via a
50 n
BNC
coaxial cable
and
a 50 n termination to
the
CH
1
OR
X
input
connector.
b.
Adjust the Trigger
LEVEL
control for a stable, triggered dis-
play.
c.
Use
the
Horizontal POSITION control to align
the
second time
marker
with
the second vertical graticule line.
d.
CHECK
-Timing
accuracy is
within
3 % (0.24 division
at
the
tenth vertical graticule line),
and
the
linearity is
within
5% (0.10
division over any two of the
center
eight divisions).
NOTE
For
checking the timing accuracy
of
the SEC/DW switch setting from
50
ms
to
0.5
s,
watch the time marker tips only at the second
and
tenth vertical graticule
Jines
while adjusting the Horizontal POSITION
control
to
line
up
the time markers.
e.
Repeat parts b through d for
the
remaining
SEC/DIV
and
time
mark generator setting combinations as shown
in
Table 4-3.
NOTE
In
X50 magnification in all "2" decade switch settings, the associated
time marker settings give only five markers per ten divisions instead
of
ten with the
"1
"and
"5" decade switch settings. When checking the
"2" ranges, position the time markers on the second
and
ninth vertical
graticule Jines.
f.
SET:
SEC/DIV .......... ..........
.. ..
....... 0.1 µs
Horizontal Magnify ............. X10
g.
Select 10 ns time markers from
the
time-marker generator.
h.
Use
the
Horizontal POSITION control to align
the
first time
marker that is 50 ns beyond the start of the sweep
with
the
second
vertical graticule line.
i.
CHECK
- Timing accuracy is
within
4 % (0.32 division
at
the
tenth
vertical graticule line),
and
the
linearity is
within
7% (0.14
division over any two of the center eight divisions). Exclude any
portion of
the
sweep past the 50th magnified division.
4-
13
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