Time Difference Between Pulses On Time Related Signals; Time Difference Between Pulses On Time Related Signals - Tektronix 2213A Instruction Manual

Operating Procedures— 2213A Operators
3. Set the appropriate VOLTS/DIV switch and variable
control for an exact 5-division display.
4. Vertically position the trace so that the zero reference
of the waveform touches the 0% graticule line and the top of
the waveform touches the 100% graticule line.
5. Horizontally position the display so the 10% point on
the waveform intersects the second vertical graticule line.
6. Measure the horizontal distance between the 10%
and 90% points (between Points A and B of Figure 4-6) and
calculate the time duration using the following formula:
horizontal
distance
Rise (divisions)
Time = ________________________
magnification factor
Example: The horizontal distance between the 10% and
90% points is 5 divisions, and the SEC/DIV switch is set
to 1 fis per division. The X I0 magnifier knob is off (knob
in).
Substituting the given values in the formula:
5 div x 1 nsldiv
Rise Time
i
Time Difference Between Pulses On Time-Related
Signals
The calibrated sweep speed and dual-trace features of
the 2213A allow measurement of the time difference be­
tween two separate events. To measure time difference,
use the following procedure:
1. Preset instrument controls and obtain a baseline
trace, then set the TRIGGER SOURCE switch to CH 1.
2. Set both Input Coupling switches to the same posi­
tion, depending on the type of input coupling desired.
3. Using either probes or cables with equal tyne delays,
connect a known reference signal to the Channel 1 input
and the comparison signal to the Channel 2 input.
4. Set both VOLTS/DIV switches for 4- or 5-division
displays.
4-6
SEC/DIV
x switch
setting
5 ns
5. Select BOTH VERTICAL MODE; then select either
ALT or CHOP, depending on the frequency of input signals.
6. If the two signals are of opposite polarity, press in the
Channel 2 INVERT button to invert the Channel 2 display
(signals may be of opposite polarity due to 180° phase
difference).
7. Adjust the TRIGGER LEVEL control for a stable
display.
8. Set the SEC/DIV switch to a sweep speed which pro­
vides three or more divisions of horizontal separation be­
tween the reference points on the two displays. Center each
of the displays vertically (see Figure 4-7)
9. Measure the horizontal difference between the two
signal reference points and calculate the time difference us­
ing the following formula:
SEC/DIV
switch
Time setting
Difference = ________________________
magnification factor
EXAMPLE: The SEC/DIV switch is set to 50 ^s per divi­
sion, the X I0 Magnifier is on (button out) and the hori­
zontal difference between waveform measurement
points is 4.5 divisions.
Substituting the given values in the formula:
Time
50 Ats/div x 4.5 div
Difference
10
Figure 4-7. Time difference between pulses on time-related
signals.
horizontal
x difference
(divisions)
22.5 ns