Tektronix 7A19 Instruction Manual page 9

manual . Contact your local TEKTRONIX Field Office or
representative for assistance in making specific measure-
ments .
Peak-to-Peak Voltage Measurements (AC)
To make peak-to-peak voltage measurements, use the
following procedure:
1 . Apply the signal to the INPUT connector.
2. Set the Coupling switch to AC .
NOTE
For low-frequency signals below about 1 kHz, use the
DC position to prevent attenuation of the signal.
3. Set the VOLTS/DIV switch to display about five
vertical divisions of the waveform .
4. Set the time-base Triggering controls for a stable
display. Set the time base to a sweep rate which displays
several cycles of the waveform .
5. Turn the 7A19 POSITION control so the lower
portion of the waveform coincides with one of the graticule
lines below the center horizontal line, and the top of the
waveform is within the viewing area . With the time base
Position control, move the display so one of the upper
peaks lies near the center vertical line (see Fig . 2-1) .
6. Measure the divisions of vertical deflection peak to
peak .
NOTE
This technique can also be used to make
measurements between two points on the waveform,
rather than peak to peak.
7 . Multiply the distance measured in step 6 by the
VOLTS/DIV switch setting. Include the attenuation factor
of the probe, if used .
EXAMPLE : Assume that the peak to peak vertical
deflection is 4.5 divisions using a 10X attenuator probe,
and the VOLTS/DIV switch is set to 1 V.
Operating Instructions--7A19
Fig . 2-1 . Measuring the peak to peak voltage of a waveform .
vertical
VOLTS/DIV
probe
Volts = deflection X
setting
X attenuator
(divisions) factor
Substituting the given values :
Volts Peak to Peak = 4.5 X 1 X 10
The peak-to-peak voltage is 45 volts.
When using a coded probe and an oscilloscope equipped
with readout, simply multiply the distance measured in step
6 by the deflection factor displayed on the CRT.
Instantaneous Voltage Measurements (DC)
To measure the DC level at a given point on a waveform,
proceed as follows:
1 . Connect the signal to the INPUT connector.
2. Set the VOLTS/DIV switch to display about five
divisions.
3. Set the Coupling switch to GND, and position the
trace to the bottom graticule line or other reference line . If
the voltage is negative with respect to ground, position the
2- 3