Pulse Width Measurements; Delayed-Sweep Measurements; X-Y Phase Measurements - Tektronix 7B80 Instruction Manual

Operating Instructions-7B80
8. Multiply the horizontal distance measured in step 7 by
the TIMEIDIV switch setting. (Divide the answer by 10 if
sweep magnification i s used.)
Example: Assume that the horizontal distance from the 10
to 90% points is 2.5 divisions and the TIMEIDIV switch set-
ting is .l p s (see Figure 1-7).
Using the formula:
Horizontal distance TIMEIDIV
Rise Time
=
(divisions) setting
Magnification
Substituting values:
Rise Time
=
2.5 x 0.1 p s
=
0.25 microsecond
8. Multiply the horizonal distance measured in step 7 by
the TIMEIDIV switch setting. (Divide the answer by 10 if
sweep magnification is used.)
Example: Assume that the horizontal distance between the
50% amplitude points i s 3 divisions, and the TIMEIDIV
switch setting i s .l ms (see Figure 1-8).
Using the formula:
Horizontal TIMEIDIV
Pulse Width
=
distance X
setting
Magnification
Substituting values:
Pulse Width
=
3 X 0.1 ms
=
0.3 millisecond
1
DELAYED-SWEEP MEASUREMENTS
Pulse Width Measurements
Perform the following procedure to measure the pulse
width of a displayed waveform:
1. Install the time-base unit in a mainframe horizontal
compartment (either A or B horizontal in a four-compart-
ment mainframe).
2. Connect the signal to be measured to the vertical unit
input.
The time-base unit may be used with a delaying time-base
unit in a mainframe with two horizontal compartments to
make delayed-sweep measurements. See the Tektronix
Products Catalog for compatible delaying time-base plug-in
units. I f a compatible delaying time-base unit is available,
refer to the instruction manual for that unit for detailed
delayed-sweep measurement procedures.
X - Y PHASE MEASUREMENTS
The phase difference between two signals with the same fre-
quency can be measured with a 7B80 Option 2 and ampli-
fier plug-in units. Refer to the Instrument Options section
of this manual for detailed procedures.
3. Set the mainframe horizontal- and vertical-mode
switches t o display the time base and vertical unit. (Check
that the time base VARIABLE (CAL IN) control is pushed
in and the HOLD OFF control is in the MIN position.)
4. Set the TRIGGERING switches and LEVEL control
for a stable display (see General Operating Information for
selecting proper triggering).
5. Set the vertical deflection factor and position control
for about a 5-division pulse vertically centered on the
graticule.
6.
Set the TIM EIDIV switch and POSITION control for 1
complete pulse displayed within the center 8 graticule divi-
sions a s shown in Figure 1-8.
7. Measure the horizontal distance in divisions between the
50% amplitude points of the displayed pulse (see Figure
1-8). Fig. 1-8. Measuring the pulse width of a displayed waveform.
PULSE WIDTH
1
A T 0 6
1985-12
Scans by ArtekMedia O 2006