EXAMPLE
In
Figure 9, the
vertical
distance between the two points is 4.4 div. If the
VOLTS
/DIV
control is set at
0.2V/div
and a
PC-41
probe
( X 10 setting) is used, the volt-
age is calculated as
follows:
Voltage
between 2 points =
4.4(div)
X
0.2(V/div)
X 10 = 8.8V
Common-Mode
Rejection
By
using the EBBRSHBBfll
MODE
control's ADD setting, unnecessary signal
components can be eliminated allowing only desired components to be displayed.
1.
Apply
the whole signal (including its unnecessary components) to the CHI
INPUT
terminal. Now apply the component you want eliminated to the CH2
INPUT
terminal.
2.
Set the
Ipfjpff^lMODE
control to
ALT
or
CHOP.
Set the
SOURCE
control
at
CH2.
Set the trigger point at the CH2 signal, and
verify
that
CH2 contains
the unnecessary component of
CHI.
3.
Press the CH2
INV
switch,
and
verify
that
the CH2 signal represents the un-
necessary component in reverse polarity. When the
llBSBSi
MODE
control
is set at ADD under
these
conditions, only the necessary signal
components
will
be displayed on the
CRT
screen.
CHI
: signal containing un-neccessary
component
ADD
: signal after eliminated
un-necessary component
Note:
Elimination
capabilities
vary
with
the size of the unnecessary component. In
order to attain the
best
results, display the CH2 signal
with
a slightly higher
VOLTS/DIV
setting.
After
pressing the CH2 INV
switch,
and activating the
ADD
function, adjust the
VARIABLE
control of
CH2
to get a good waveform.
Also,
after pressing the CH2 INV control and switching to the
ADD
setting, the
displayed
waveform may move up or down. Move it back to the display position
using
the y
POSITION
control for
CH2.
22
CH2
: signal of un-necessary
component
Figure
10. Common-Mode Rejection
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