Tektronix 7A16A Instruction Manual page 10

Operation-7Α16Α
7 . Mu ltiply th e
d
istance meas ure
d
in step 7
b
y the 5. Set th e time-base Triggeri ng controls fo r α stable
V
O LTS/DIV switch setting. Include the attenuation factor
d
is p lay . Set the Time Base swee p rate for an opti mum
of the
p
robe if used .
d
is
p
lay of the waveform .
EXAMPLE : Assume that th e peak to p ea k vertical
6. Measure th e
d
ista nce in
d
ivisio ns
b
etwee n
t
he refer-
deflectio n is 4 .5
d
ivisions using α 10 Χ attenuator
p
robe, ence line and the
p
oint on the waveform at wh ich
t
he DC
and t he VO LTS/DIV switch is set to 1 V .
level is to be measured . For exam ple, in Fig. 2-2 the
measurement is between t h e reference line an
d
p oint Α.
vertical
VO LTS/DIV
p ro be
Volts =
d
eflection Χ Χ attenuator
( d ivisio n s)
setting
facto r
S
ubstituti ng th e given values :
Volts
P
ea k to
P
ea k = 4.5 Χ 1 Χ 10
The
p
ea k-to-
p
ea k voltage is 45 volts.
If you are using α 7Α16 Α with α co ded probe an d an
oscillosco pe equ ipp ed wit h rea d o u t, si mp ly multi ply the
d istance measured in step 7
b
y t he deflection factor
d
is
p
laye
d
on the C RT.
Instantantous
V
oltage Measurements (DC)
To measure the DC level at α give n point on α waveform,
p
rocee
d
as follows :
1 . Co nnect the signal to th e In
p
ut connector .
2. Set the VO LTS/DIV switch to
d
isplay about five
d
ivisio ns.
3. Set th e Coup ling switch to GN D an
d p
osition the
trace to the bottom graticule line or ot her reference line . If
the voltage is negative with res
p
ect to grou nd ,
p
osition the
trace to the top gratic u le li ne. Do
n
ot move the POSITION
control after th is reference line
h
as
b
een establis he
d
.
NO ΤΕ
7.
E
stablish
t
he
p
olarity of the waveform .
W
it h
t
h e
+UP /I NV switch
i
n
t
he + UP p
ositio n, any
p
oi n t above th e
reference line is
p
ositive.
8. Multiply th e
d
ista nce measured
i
n step 7 by the
VO LTS/DI V switch setti ng. Include th e atte nuation factor
of the
p
robe, if use
d
.
EXAMPLE : Assume th e vertical
d
istance measured is
3.6
d
ivisions (see Fig. 2-2) an
d
t
he waveform is above the
r
eference line using α 10 Χ
p
robe with α VO LTS/DIV switch
setting of 0.5 V .
U
sing the form ula :
Instan- vertical VO LTS/
p
robe
taneous =
d
istance Χ
p
olarity Χ
DI V Χ atte nuation
Voltage (
d
ivisions)
setting factor
Sub stit uti ng the given values :
Instantaneous Voltage = 3.6 Χ 1 Χ 0 .5 V Χ 10
The instantaneous voltage is 18 volts.
To measure α voltage level with
r
espect to anot
h
e
r
Ve r tical
voltage rat
h
e
r
t
h
an grou
n
d, ma
k
e t
h
e following
distance
c
h
anges to Step 4. Set t h
e Coupling switc
h
to DC and
apply t
h
e refe
r
ence voltage to t
h
e Input con
n
ecto
r
.
T
h
en position t
h
e trace to t
h
e
r
efe
r
ence line and
disconnect t
h
e
r
efere
n
ce voltage.
R
eferen ce line
4 . Set the Cou
p
ling switch to DC . The groun
d
refe rence ' '
line can
b
e chec ke
d
at any time by switching to the GND
F
ig, 2.2, Meas uri ng instantaneous voltage with respect to same
position . reference.