Performance Check-2445A/2455A Service
h.
Rotate the TRACE
SEP
control
CCW
to separate
the the A
and
B sweep displays.
i.
CHECK-
The
B sweep is displayed with the A
sweep.
j.
Push
the SEC/DIV knob
in.
k.
CHECK-Only
the B sweep
is
displayed.
2. Check A and B Timing, A Cursor Accuracies,
and A Cursor Range.
a.
Set:
HORIZONTAL
A SEC/DIV
TRACE SEP
Delta
~t
10
ns
(knob
in)
Fully CW
On
(press
and
release
for
~t
display)
b.
Select 10
ns
time markers from the Time-Mark Gen-
erator
and
adjust the TRIGGER LEVEL control for a stable
display.
c.
Use
the Horizontal POSITION control to align the
2nd time marker with the
2nd
vertical graticule
line
(2nd
from the
left edge of the display).
4-22
NOTE
The
2 ns and the 5 ns time markers are sinusoidal.
Use either the rising
or
falling zero-crossings as
alignment points.
d.
Align the
~
REF
cursor with the 2nd time marker
and
align the
~
cursor with the 10th time marker.
e.
CHECK-The
A Sweep timing
and
cursor readout
accuracies are within limits given
in
Tables
4-7
and
4-8.
NOTE
If
the
2nd
and 10th time markers are within
0.
06 divi-
sion
of
the
2nd
and 10th vertical graticule lines for
unmagnified sweeps
and
within
0.
1 division for
magnified sweeps, the sweep timing accuracy is con-
servatively within limits.
When
the timing accuracy is
checked
at
each sweep speed, note any SEC/DIV
setting
at
which the timing error exceeds the
0.
06-division limit. Check these sweep speeds
against the major-division time-interval limits given in
Table
4-8.
NOTE
For SEC/DIV setting
of
10
ns,
the time-marker
period is greater than 1 division when the sweep is
magnified.
At
1 ns
per
division (SEC/DIV setting
of
10 ns with X10 MAG), input the signal through a
dual input coupler to
CH1
and CH2. Select
CH1,
CH2,
and CH2 INVERT. Set the CH 1 and CH 2
VOL
TS/DIV settings for a 6 division signal. Center
the waveforms. Check
for
4 cycles between the
2nd
and 10th vertical graticule lines (within
0.1
division)
at
the intersections
of
the waveforms.
f.
Repeat parts
c,
d and e for each A SEC/DIV-time
marker combination given
in
Table 4-7 for both
unmagnified and magnified sweeps.
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