EZ Digital OS-3060D Specifikace Strana 39

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®
If
the signal to be measured does not trigger or the
measurement is
difficult beca use of its weakness though the
VOLT/D1V switch is positioned
on
SmV. pull the VARIABLE (PULL
XS MAG ) [ lSJ [ 16]. At this time. where the VOLT
/ON
switch is
set to SmV, it becomes
lmV
/O
N
and
the frequency wide
band
width decreases to 7 MH z. However. the noise increases on the
trace.
® If the signal you wish to observe is a high frequency, thus
resulting in too many cycles though the TIME/D1V switch which
is set to the position
of
0
.2~s.
pull the
'TIM
E VARIABLE
terminal (PULL X10 MAG) [2S].
The
n the sweep speed increases
by ten [
IO
J times so that
0
.2
~s
becomes 20ns/div and
O
.S
~s
becomes
SO
ns/div.
0.2 and
O.S~
s
MAG
arc the uncalibrated terminal
and
1us or
less is the calibrated terminal. (When magnified by XIO in
lus
/di
v, the value is ± 10%
and
when magnified by XIO in less
than
I ps, the value is ± S%).
(j)
When
measuring DC or very low frequency. the AC coupling
results in the attenuation of signal or distortion so that use
the instrument after having the AC-
OC.G
NO switch [ 11], [ 12J
positi
oned
to DC.
Caution : Where the wavef
orm
of
very low AC level is loaded on
the high DC voltage. it may not appear on DC
positi
on
.
The
NORM
of
TRI
GGER M
OD
E switch [27J is the position
to be
reswept. When observing sig
na
l frequency below 2SHz, you
can
also perform the measurement by adj usting the T
RIGGE
R
LEVEL
[30].
.
(2)
Dual-trace measurement
Dual-trace measurement is the major function of this instrument,
OS-3OOO
0 . The measuring procedure is same as that
of
2-2-4
single-trace measurement above with the exception of the following :
CD
Set the V
MODE
switch [ 19J to dual.
Use ALT for relatively high-frequency signals (TIME/ON switch
:O.2rns or faster). and usc CHOP for
relatively l
ow-
freq uency
signals (TIME/DIV switch : O.Srns or slower).
39
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