Peak-To-Peak Waveform Voltage; Instantaneous Voltage - Tektronix 2213A Instruction Manual

Operating Procedures— 2213A Operators
NOTE
If the amplitude measurement is critical or if the trace
is thick (as a result o f hum or noise on the signal), a
more accurate value can be obtained by measuring
from the top o f a peak to the top o f a valley. This will
eliminate trace thickness from the measurement.
9. Calculate the peak-to-peak voltage, using the follow­
ing formula:
vertical
Volts (p-p) = deflection
(divisions)
EXAMPLE: The measured peak-to-peak vertical deflec­
tion is 4.6 divisions (see Figure 4-1) using a 10X attenua­
tor probe with the VOLTS/DIV switch set to 5 V (at 10X
PROBE setting).
Substituting the given values:
Volts (p-p) = 4.6 div x 5 V/div = 23 V.

Instantaneous Voltage

To measure instantaneous level at a given point on a
waveform, referred to ground, use the following procedure:
1. Preset instrument controls and obtain a baseline
trace.
Figure 4-1. Peak-to-Peak waveform voltage.
4-2
VOLTS/DIV
switch setting
x indicated by 1X
(or 10X PROBE when
10X probe is used)
2. Apply the signal to either vertical-channel input con­
nector and set the VERTICAL MODE switch to display the
channel used.
3. Verify that the VOLTS/DIV Variable control is in the
CAL detent and set the Input Coupling switch to GND.
4. Vertically position the baseline trace to the center
horizontal graticule line. This establishes the ground refer­
ence location.
NOTE
If measurements are to be made relative to a voltage
level other than ground, set the Input Coupling switch
to DC instead, and apply the reference voltage to the
input connector. Then position the trace to the refer­
ence (horizontal graticule) line.
5. Set the COUPLING switch to DC. Points on the
waveform above the ground reference location are positive.
Those points below are negative.
NOTE
If using Channel 2, ensure that the Channel 2 INVERT
switch is in its noninverting mode (button out).
6. If necessary, repeat Step 4 using a different refer­
ence line which allows the waveform in Step 5 to be dis­
played on screen.
7. Adjust the TRIGGER LEVEL control to obtain a sta­
ble display.
8. Set the SEC/DIV switch to a position that displays
several cycles of the signal.
9. Measure the divisions of vertical deflection between
the ground reference line and the point on the waveform at
which the level is to be determined (see Figure 4-2).