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6. Select ADD VERTICA L M OD E and press in
t
he
INVERT button, and slig h tly readju st the CH 2
V
OLTS/DIV
Variable control for maxim u m cancellation of the un
d
esired
signal component (see Figure 4-3Β).
Am plitude Comparison (Ratio)
In some app lications it may be necessary to esta blish α
set of
d
eflection factors ot her than those indicated
b
y t h e
V
O LTS/DIV switch settings . This is
u
seful for com
p
aring
un known signals to α reference signal of
k
nown am
p
litude .
To accomplish
t
his, α reference signal of kn own amplitude is
first set to an exact number of vertical divisions
b
y adj usti ng
the
V
OLTS/DIV switch and
V
ariable co ntrol . Un known sig-
n als can then
b
e
q
uickly and accurately compared wit h
t
h e
reference signal without distur bing the setting of th e
V
O LTS/DIV Variable control . This procedure is as follows:
1 . Preset instrume nt controls and obtain α baseline
trace.
2. Apply
t
he
r
eference signal to either vertical c hannel
input and set the VERTICA L MOD E switch to display the
channel used .
3 . Set t h e am plitude of the refe rence signal to five verti-
cal divisions
b
y ad justi ng the
V
OLTS/DI V switch a n
d
V
OLTS/DI V Variable control.
4. Disconnect the reference signal an
d
apply t h e un-
known signal to
b
e measure
d
to the same chan nel input .
Adjust the ve rtical
p
osition of the waveform so that its
b
ot-
tom edge just touc hes the 0°/ο line on the crt.
5. Horizontally position the waveform so that its top
most features cross the center vertical graticule li ne (see
Figu re 4-4).
6.
R
ea
d
t
he percent ratio directly from the gradu ations
of the center li n e, referring to the 0% an
d
100%
p
ercentage
marks on the left edge of the graticule (1 minor division
equals 4% for α 5-
d
ivision display) .
TIME
ME
AS
UREMEN
TS
Time Du ration
To measure time
b
etween two points on α waveform,
use the following procedure.
/
1 . Preset instrument controls an d
o
btai n α
b
aseline
trace.
2 . Apply
t
he signal to either ve rtical-chan nel input con-
nector and set the VERTICA L MOD E switch to display the
channel used .
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