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Operating Procedures-221
SA
Operators
POSITION TO
CENTER
LINE
MEASURE
AMPLITUDE
FROM
A to B
Figure
4-1. Peak-to-Peak waveform
voltage.
4732-07
7. Horizontally position
the
display so that one of
the
positive peaks coincides with
the
center vertical graticule
line
(see Figure 4-1
,
Point B).
8.
Measure
the
vertical
deflection from peak-to-peak
(see
Figure 4-1
,
Point A to
Point
B).
NOTE
If
the amplitude measurement is critical or if the trace
is
thick (as a result of hum or noise on the
signal),
a
more accurate value 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.
9.
Calculate the peak-to-peak
voltage,
using the
follow-
ing
formula:
vertical
Volts (p-p)
=
deflection x
(divisions)
VOLTS/DIV
switch setting
indicated by 1 X
(or 1 OX PROBE when
1 OX probe is used)
EXAMPLE:
The measured peak-to-peak
vertical
deflec-
tion is
4.6 divisions (see
Figure
4-1) using a 1 OX
at
tenua-
tor
probe with the VOLTS/DIV switch set to 5 V (at 1 OX
PROBE setting).
Substituting
the given values:
Volts (p-p)
=
4.6 div x 5 V/div
=
23
V.
4-2
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.
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 Coupling switch to
GND.
4.
Vertically position the
baseline
trace to the
center
hor-
izontal graticule line. This establishes the ground reference
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
reference
line which allows the waveform
in
Step 5 to be displayed
on
screen.
7. Adjust the A
TRIGGER
LEVEL control to obtain a sta-
ble
display.
8. Set the A 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).
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