Delayed-Sweep Time Measurements; Measurements; Pulse Jitter Time Measurement; Triggered Magnified Sweep - Tektronix 2235A Instruction Manual

Operatlng lnstructlons
-
2235A
lnstructlon
Pulse Jitter Time Measurement
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 2-20, measure the difference
between Point C and Point D in divisions and calcu-
late the pulse jitter time using the following formula:
Pulse Horizontal
B SECIDIV
Jitter
=
difference
x
switch
Time
(divisions) setting
INTENSIFIED ZONE
TO BE MAGNIFIED
A TRA
B TRA
MEASURE
TIME FROM- 1 -
@
TO
@
4732-1 1
~ i ~ u r e
2-20.
Pulse Jitter.
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 TlME
MEASUREMENTS
Operating this instrument with the 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 procedures
describe how these measurements are accomplished.
Time Difference on Single Waveform
To measure time between two points on a waveform, use
the following procedure.
1.
Preset instrument controls and obtain a baseline
trace.
2. Apply the signal to eithervertical-channel input con-
nector and set the Vertical MODE switch to display
the channel used.
3. Set the appropriate VOLTSIDIV switch to produce a
display of approximately 2 or 3 divisions in
amplitude.
4.
Set the A SECIDIV switch to display the measure-
Triggered Magnified Sweep
ment points of interest on the waveform. Ensure that
the SECIDIV Variable control is in the CAL detent.
The following procedure explains how to operate the B
Sweep in a triggered mode and determine the
5. Select ALT Horizontal MODE and adjust both the
resulting apparent magnification factor. Operating the B
appropriate vertical POSITION control and AIB SWP
Sweep in a triggered mode provides a more stable
SEP control to display the A trace above the B trace
display, since the delayed display is triggered at the
(see Figure 2-21).
same point each time.
1. Perform steps 1 through 7 of the preceding Magni-
6.
Set the
B
SEC/DIV switch to the fastest sweep speed
fied Sweep Runs After Delay procedure.
that provides a usable (visible) intensified zone.
2. Adjust the B TRIGGER LEVEL control so the intensi-
7. Adjust the B DELAY TlME POSITION control to move
fied zone on the A trace is stable.
the intensified zone to the leading edge on the first
point of interest (on the A trace); then fine adjust until
NOTE
the selected portion (on the B trace) is centered at
The intensified zone seen in the ALT Horizontal
any convenient vertical graticule line (see Figure
MODE display will move from trigger point to
2-21).
trigger point as the B DELAY TIME POSITION
control is rotated.
8. Record the B DELAY POSITION dial setting.
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