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Operating
Procedures-2215A
Operators
Pulse
Jitter
Time Measure
ment
To measure pulse
jitter time:
1. Perform steps 1 through 7 of the preceding
"Magni-
fied Sweep Runs
After
Delay·
procedure.
2.
Referring
to Figure 4-11
,
measure the
difference
be-
tween
Point C and Point
D in
divisions and calculate the
pulse jitter time using
the following formula:
Pulse
Horizontal
B SEC/DIV
Jitter
difference x
switch
Time
(divisions)
setting
Triggered Magnified
Swee
p
The following procedure explains how
to operate the
B
Sweep in a triggered
mode
and to
determine
the resulting
apparent magnification factor.
Operating
the B Sweep
in a
triggered
mode
provides a
more
stable
display,
since the
delayed display is triggered at the same point each
time.
1. Perform steps
1
through
7
of the preceding
"Magni-
fied Sweep Runs After
Delay"
procedure.
2.
Adjust
the B TRIGGER
LEVEL
control so the
intensi-
fied zone on the A
trace
is stable.
NOTE
The
intensified
zone
seen in
the ALT HORIZONTAL
MODE display
will
move from
trigger point to trigger
point as
the
B DELAY TIME
POSITION
control is
rotated.
3. The apparent magnification factor can be calculated
from the formula shown in step 8 of
the
"Magnified Sweep
Runs After
Delay·
procedure.
DELAYED-SWEEP TIME MEASUREMENTS
Operating the 2215A Oscilloscope with
HORIZONTAL
MODE set to either
ALT
or
B will permit time measurements
to
be
made with a
greater degree of accuracy than attained
with
HORIZONTAL MODE
set
to
A.
The
following
proce-
dures describe how
these
measurements are accomplished.
Time Difference
On
Single
Waveform
To measure time
between
two points on a
waveform,
use the
following
procedure:
4-10
I
!.
....
I.
A TRAC
E
r
B TRAC
E
r
I
t
\
· ·
I
I
INTENSIFIED
ZONE
TO
BE
MAGNIFIED
........
~
~
.
,
,,,
. .
..
.
··\
\
~
~ I
'II
.
...
....
....
M
~
I
I
I
I
--
.
... ..
,,
MEASURE
I
I
TIME FROM-I i - JITTER
@
TO
@
4732·11
Figure 4-11. Pulse jitter.
1
.
Preset instrument controls and obtain a baseline
trace.
2. Apply the signal to either vertical-channel input
con-
nector and
set
the
VERTICAL
MODE
switch to
display the
channel
used.
3. Set the appropriate VOLTS/DIV switch to produce
a
display of approximately 2- or 3- divisions
in
amplitude.
4. Set the A SEC/DIV switch to display the measure-
ment points of interest on the waveform. Ensure that the
SEC/DIV Variable
control
is in the CAL detent.
5. Select
ALT HORIZONTAL MODE
and adjust both the
appropriate vertical POSITION control and A/B SWP SEP
control
to display the A trace above the
B
trace (see
Figure
4-12).
6. Set the B SEC/DIV switch
to
the fastest sweep speed
that
provides a useable (visible)
intensified
zone.
7. Adjust the 8 DELAY
TIME
POSITION control to move
the intensified zone to the
leading
edge on
the
first point of
interest (on the A trace); then fine adjust until
the
selected
portion (on the B trace) is centered at any convenient verti-
cal
graticule line (see Figure 4-12).
8.
Record the B DELAY POSITION dial setting.
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