Operating Procedures— 2213A Operators
3.
Set the appropriate VOLTS/DIV switch and variable
control for an exact 5-division display.
5.
Select BOTH VERTICAL MODE; then select either
ALT or CHOP, depending on the frequency of input signals.
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. 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.
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
SEC/DIV
distance
x
switch
Rise
(divisions)
setting
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:
Rise Time
5 div x 1
nsldiv
i
5
ns
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
horizontal
switch
x
difference
Time
setting
(divisions)
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.
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.
Substituting the given values in the formula:
Time
Difference
50 Ats/div x 4.5 div
10
22.5
ns
Figure 4-7. Time difference between pulses on time-related
signals.
4-6
