Time Difference Between Pulses On Time-Related Signals; Phase Difference - Tektronix 2235A Instruction Manual

Operating lnstructlons-2235A Instruction
6. Measure the horizontal distance between the 10%
8. Set the A SECIDIV switch to a sweep speed which
and 90% points (between Points A and B of Figure
provides three or more divisions of horizontal
2-1 6) and calculate the time duration using the fol-
separation between the reference points on the two
lowing formula:
displays. Center each of the displays vertically (see
Figure 2-1 6)
horizontal A SECIDIV
distance
x
switch
Rise
- -
(divisions) setting
Time magnification factor
Example: The horizontal distance between the 10%
and 90% points is 5 divisions, and the A SECIDIV
switch is set to 1
FS
per division. A magnificationfac-
tor of 1 is used.
Substituting the given values in the formula:
Rise
-
5 div
x
1 psldiv
Time
-
1
=
5FS
Time Difference Between Pulses on
Time-Related Signals
CHANNEL 1 (REFERENCE) CHANNEL 2
ASURE
E F R O M
T O
@
'
HORIZONTAL
'
-
DIFFERENCE
i -
4207-18
The calibrated sweep speed and dual-trace features of
this instrument allow measurement of the time difference
between two separate time- related events. To measure
time difference, use the following procedure:
1. Preset instrument controls and obtain a baseline
trace, then set the A & B SOURCE switch to CH 1.
2. Set both lnplit Coupling switches to the same
position, depending on the type of input coupling
desired.
Figure 2-16. Time difference between pulses on
time-related signals.
9. Measure the horizontal difference between the two
signal reference points and calculate the time dif-
ference using the following formula:
A SECIDIV horizontal
switch
x
difference
Time
-
setting (divisions)
Difference
-
magnification factor
3. Using either probes or cables with equal time
delays, connect a known reference signal to the
EXAMPLE: The A SECIDIV switch is set to 50
FS
per
Channel 1 input and the comparison signal to the
division, the XI0 Magnifier is on (button out) and the
Channel 2 input.
horizontal difference between waveform measure-
ment points is 4.5 divisions.
4. Set both VOLTSIDIV switches for 4- or 5-division
displays.
Substituting the given values in the formula:
5. Select BOTH Vertical MODE; then select either ALT Time
-
50 psldiv
x
4.5 div
or CHOP, depending on the frequency of input Difference
-
10
=
22.5
FS
signals.
6. If the two signals are of opposite polarity, press Phase Difference
INVERT button to invert the Channel 2 display (sig-
nals may be of opposite polarity due to 1 80° phase
In a similar manner to Time Difference Between Two
difference). Time-Related Pulses, phase comparison between two
signals of the same frequency can be made using the
7.
Adjust the A TRIGGER LEVEL control for a stable dual-trace feature of the instrument. This method of
display. phase difference measurement can be used up to the
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