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Tektronix 475A - Page 41

Tektronix 475A
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To
determine
the
polarity
of
the
voltage
to
be
measured,
set
the
input
coupling
switch
to
GND
and
vertically
position
the
baseline
to
the
center
of
the
crt.
Set
the
input
coupling
switch
to
DC.
If
the
waveform
moves
to
above
the
center
of
the
crt,
the
voltage
is
positive.
H
the
waveform
moves
to
below
the
center
of
the
crt,
the
voltage
is
negative.
Set
the
input
coupling
switch
to
GND
and
position
the
baseline
to
a
convenient
reference
line.
Forexample,
ifthe
voltage
to
be
measured
is
positive,
then
position
the
baseline
to
the
bottom
graticule
line.
Switch
the
Input
Coupling
Switch
to
DC.
Measure
the
divisions
of
vertical
deflection
between
the
reference
line
and
the
desired
point
on
the
waveform
(see
Fig.
15).
Multiply
the
veritcal
deflection
by
the
VOLTS/DIV
switch
setting.
Include
the
attenuation
factor
of
the
probe
if
the
probe
does
not
have
a
scale-factor
switching
connector.
EXAMPLE:
The
vertical
distance
measured
is
4.6
divisions
(see
Fig.
15),
the
waveform
is
above
the
reference
line,
and
the
VOLTS/DIV
switch
is
set
to
2.
VERTICAL
MEASURE
AMPLITUDE
DEFLECTION
Zt
18
EE
|
"
NEGATIVE
|
AMPLITUDE
Fig.
15.
instantaneous
voltage
measurement.
Using
the
formula:
Instan-
vertical
VOLTS/
taneous
=
distance
X
polarity
X
DIV
Voltage
(divisions)
setting
Substituting:
=
4.6
X
(+1)
X2
V
=
9.2
volts.
@
475A/DM44
Operators
33

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