Tektronix 2247A

tod
4
z
Performance Check Procedure
CHECK—the time-mark spacing Is equal to or less than two divisions.
Set SEC/DIV VAR fully cw (calibrated detent).
Magnifier Registration
Set X10 MAG on.
Position the rising edge of a time marker to the center vertical graticule
line.
Set X10 MAG off.
CHECK—for less than 0.5 division horizontal trace shift.
A and B Timing Accuracy and Linearity
Set A SEC/DIV to 20 ns.
Set tlme-mark generator for 20 ns time markers.
Position the time marker peaks vertically to the center horizontal
graticule line (allows use of the minor division graticule markings as an
ald In making the accuracy checks).
NOTE
For the fastest sweep speeds, where the time marker peaks are
rounded and not well defined, greater resolution can be achieved
by vertically centering the display and using the points where the
rising edges of the time markers cross the center horizontal
graticule line as a reference.
Position
the
second
time
marker
to
the
second
vertical
graticule
line.
CHECK—that
the
tenth
time
marker
Is
within
0.16
division
(left
or
right)
of
the
tenth
graticule
line.
CHECK
—that
the
spacing
of
tlme
markers
over
any
two-division
Inter-
val
within
the
center
eight
divisions
does
not
deviate
from
the
value
measured
at
the
center
two
divisions
by
more
than
0.1
division.
Repeat
the
procedure
for
all
other
SEC/DIV
settings.
Use
the
SEC/DIV
and
Time
Mark
Generator
settings
In
the
column
labeled
X1
given
In
Table
7-3,
Settings
for
Timing
Accuracy
Checks.
2247A Operators 7-39