Specifications

NOTE
lf the amplitude
measurement is critical or
if
the
trace
is
thick as a
result
of
hum
and/or noise on the
signal,
a more accurate
measurement 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.
5.
Calculate
the
peak-to-peak
voltage, using
the
following
formula:
VO LTS/D
IV
X
switch
setting
INSTANTANEOUS
DC VOLTAGE
NOTE
Either
channel
input connector may
be
used for
the
signal
input.
Use
the VERT MODE
switch
to select
the
appropriate
channel for display.
1. Obtain
a
Normal
Sweep
Display
(refer
to Basic
Oscilloscope
Displays
section
of this
manual). Make
sure the
VAR
VOLTS/DIV
control is
in
the cal-
ibrated detent.
2.
Determine the
polarity
of
the
voltage
to be
measured
as
follows:
a.
Set
the AC-GND-DC switch
to GND and
verti-
cally
position
the baseline to the center
graticule
line
of the crt.
b. Set
the
AC-GND-DC
switch to
DC. lf
the
wave-
form moves
above the center line of the crt, the
voltage is
positive.
lf
the waveform
moves below
the center
line
of the crt, the
voltage is negative.
3.
Set
the AC-GND-DC switch
to GND and
position
the
baseline
to
a
convenient
reference line.
For
example,
if the
voltage
to be
measured is
positive,
then
position
Volts
{p-p)
vertical
=
deflection
factor
Also
include
the attenuation
factor
of the
probe
being
used, if it is not
a 10X
scale-factor-switching
probe.
EXAMPLE: The
measured
peak-to-peak
vertical deflec-
tion
is 4.6 divisions
(see
Figure
14)
with
a
VOLTS/DIV
switch setting of 0.5,
using a 10X
scale-factor-switching
probe.
Substituting
the
given
values:
Volts
(p-p)
=
4.6 divisions
X
0.5 V/divisions =
2.3
volts
@
42
4658/DM44
Operators