Tektronix 5440 Instruction Manual page 19

6 . Multiply the distance (i n divisions) measu red instep
5 by the
V
olts/Div switch setting . Also include the
atte n uation factor of the
p ro be, if a
pp
licable.
EXA MPLE : Assume α
p
ea k-to-
p
ea k vertical deflection
of 4 .6 divisio n s an d α V
olts/Div switch settings of 5
V .
Pea k -to- pea k _ 4 .6
Χ 5 ( Volts/Div - 23
Volts
(divisions)
setti ng)
volts
Instantaneous V oltage
M
easurement-DC
d Ι Ι t
ιη t οη α ωανef ο rm
Το measure the c eve α α given ρο - ιαΙ
use the followi n g
p
rocedure :
Ι
V
ertical
1 . Set the in put cou
p
ling of t h e vertical plug-i n unit to
Gn
d
an d positio n
t h e trace to the
b ottom line of th e ____
graticule (or ot her selected reference line) . If the voltage
to
b e measured is negative with res pect to ground,
R
eference line
position th e trace to t h e top li ne of the graticule. Do not
move th e vertical Position control after th is refere n ce
h
as
bee n esta blished.
F
eerence nvoltage. g
i nstanta neous do voltage with res pect to α
ΝΟΤΕ
ΝΟΤΕ
T
h
is tec
h
nique may also be use d
to ma
k
e
measu r
eme
n
ts between two points on t
h
e waveform,
rat
h
e
r
t
h
an pea
k
to p ea
k
.
ΝΟΤΕ
If an attenuator
p
robe is used t
h
at cannot c h
ange t
h
e
scale factor rea
d
out (VoltslDiv), multiply the right
si
d
e of t
h
e above equation by t
h
e attenuatio n
factor.
P
ositio n to ce nte r
ve rtical line
~3~~~~ιι
r
..ι
r
r
r ιιιιιιιιιι
rr
Ι
t
FA
deflection
Fig . 1-6. Measu ring pea k-to-p ea k voltage of α waveform.
Operating Information-5440
To measure α voltage level wit
h
res
p
ect to α voltage
ot
h
er than groun
d
, ma
k
e t
h
e following c
h
anges to
step 1 : Set t
h
e input coupli
n
g switc
h
to do and a
pp
ly
t
h
e
r
eference voltage to t
h
e input connector, t
h
en
p osition t
h
e trace to t
h
e reference line .
2 . Co nnect the signal to th e in
p
ut con nector. Set the
in put cou
p
ling to
d
o (t he grou nd refere nce can be
chec ked at anytime by setting the in put cou p
ling to Gnd) .
3 . Set the
V
olts/Div switch to
d isplay about 5 or 6
vertical divisions of th e waveform . Chec k
t h at the variable
V
olts/Div control (red k nob) is in the Cal positio n . Ad j ust
t he time-base triggeri ng co ntrols for α stable display .
4.
M easure t he d istance i n d ivisions
b
etween
t
he
refere n ce line an
d
t
h e point on th e waveform at w h ic h
t
he
do level is to be measured . Fo r exam ple, i n Fig . 1-7 the
measurement is made between the refere nce li ne and
p
oi n t Α .
5 . Establis h
t
he
p olarity . The voltage is positive if the
signal is app lied to the + i nput co nn ector and the
waveform is above the refere nce line .
6. Mu ltiply the distance measure d in step 4
b
y the
V
olts/Div switc h setting. Includ e the attenuation factor of
th e
p
robe, if a
p
p licable (see the
n ote following the Pea k-
to-Pea k Voltage
M
easurement exam
p
le) .
EXA MPLE : Assume that the vertical distance measured
is 4.6 divisio ns, the
p olarity is positive, an
d
t
he
V
olts/Div
switch setting is 2
V .
Instanta neous _
4 .6
Χ
2 - +9 .2
V
oltage
(divisions) ( Volts/Div)
volts
1- 1 3