Applications
5. Vertically position the display so that the negative peak of the
waveform coincides with one of the horizontal graticule lines
(see Figure 3-1, Point A).
6. Horizontally position the display so that one of the positive
peaks coincides with the center vertical graticule line
(Figure 3-1, Point B).
7. Measure the divisions of vertical deflection from peak to peak
(Figure 3-1, Point A to Point B).
NOTE
If the amplitude measurement is critical or if the trace
is thick (because of hum or noise on the signal), a
more accurate result can be obtained by measuring
from the top of a peak to the top of a valley. This will
eliminate trace thickness from the measurement.
8. Calculate the peak-to-peak voltage, using the following
formula:
vertical VOLTS/DIV
V = deflection x setting
(divisions) (1 OX PROBE)*
*lf a IX probe is being used for the measurement, use the IX
VOLTS/DIV setting.
EXAMPLE. In Figure 3-1, the measured peak-to-peak vertical
deflection is 4.6 divisions using a 10X attenuator probe with the
VOLTS/DIV switch set to 5 V (10X PROBE).
Substituting the given values:
Vp.p = 4.6 div x 5 V/div = 23 V.
Instantaneous Voltage
To measure the instantaneous voltage level at a given point on a
waveform, referred to ground, use the following procedure:
1. Apply the ac signal to either the CH 1 or the CH 2 input con
nector and set the VERTICAL MODE switch to display the
channel used.
2. Verify that the VOLTS/DIV variable control is in the CAL detent
and set input coupling to GND.
3. Vertically position the trace to the center horizontal graticule
line. This establishes the ground reference location.
3-2
2225 Operators
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