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Tektronix 47E5A

Tektronix 47E5A
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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. If
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
.
For
example, if
the
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
VOL
TS/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
VOL
TS/DIV
switch
is
set
to 2.
_ L
:EGATIVE
REFERENCE
LINE
~
I
,J
·
dx
90
u
""
--
--
-
T---
~
VERTICAL
DEFLECTION
MEASURE
L_
AMPLITUDE
1 "
ATO
B
____
t .
OR
NEGATIVE
AMPLITUDE
CTfB
W
465/DM·
O-7
Fig_
15.
Instantaneous
yoltage
measurement.
Using
the
formula
:
Instan-
taneous
Voltage
vertical VOL
TSI
distance
X
polarity
X DIV
(divisions)
setting
Substituting:
= 4.6 X
(+1)
X 2 V = 9.2 volts.
@
475A/DM44 Operators
33

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