APPLICATIONS
PROBE
ADJUSTMENT
To
obtain
an accurate measurement result, the probe must
be adjusted correctly before measurement.
1.
Connect the probe to the INPUT terminal and set the con-
trol
for a normal sweep display.
2.
Connect the probe to the CAL terminal on the
front
panel,
and adjust the
SWEEP
TIME/DIV switch so
that
several
cycles
of this signal are displayed.
3.
Adjust the trimmer on the probe to
obtain
the
following
correct compensation waveform.
Correct
compensation
Over
compensation
Insufficient
compensation
Fig.
15
2.
Set the A
TRIG
MODE to AUTO and AC-GND-DC to the
GND
position, which established the zero
volt
reference.
Using the •
POSITION
control, adjust the trace
position
to the desired reference level position, making sure not
to disturb this setting once made.
3.
Set the AC-GND-DC switch to the DC
position
to observe
the
input
waveform, including its DC component. If an
appropriate reference level or
VOLTS/DIV
setting was not
made, the waveform may not be visible on the CRT
screen
at this
point.
If so, reset
VOLTS/DIV
and/or the
•
POSITION
control.
4.
Use the < •
POSITION
control
to
bring
the
portion
of
the waveform to be measured to the center vertical
graduation line of the CRT screen.
5.
Measure the vertical distance
from
the reference level
to the
point
to be measured, (the reference level can be
rechecked
by setting the AC-GND-DC switch again to
GND).
Multiply
the distance measured above by the
VOLTS/DIV
setting and the probe attenuation
ratio
as well. Voltages
above and below the reference level are positive and
negative values respectively.
Using the formula:
DC
level = Vertical distance in divisions x
(VOLTS/DIV
set-
ting) x (probe attenuation ratio).
TRACE
ROTATION COMPENSATION
Rotation
from
a horizontal trace
position
can be the cause
of measurement errors.
Adjust the controls for a single display. Set the AC-GND-DC
switch to GND and A
TRIG
MODE to
AUTO.
Adjust the •
POSITION
control
such
that
the trace is over the center
horizontal graticule line. If the trace appears to be
rotated
from
horizontal, align it
with
the center graticule line using
the
TRACE
ROTATION
control
located on the
front
panel.
DC
VOLTAGE MEASUREMENTS
This
procedure describes the measurement procedure for
waveforms including the DC component.
Procedure:
1.
Connect the signal to be measured to the INPUT jack.Set
the vertical MODE to the channel to be used. Set the
VOLTS/DIV
and
SWEEP
TIME/DIV switch to
obtain
a nor-
mal display of the waveform to be measured. Set the
VARIABLE
control
to CAL position.
Measuring point adjusted to The" center
vertical
scale
by «f • POSITION I
[EXAMPLE]
For
the example, the
point
being measured is 3.8 divisions
from
the reference level (ground potential).
If the
VOLTS/DIV
was set to 0.2 V/div and a 10:1 probe
was
used. (See Fig. 16)
Substituting the given values:
DC
level = 3.8 (div) x 0.2(V/div) x 10 = 7.6 V
19
Vertical
distance
Ground potential adjusted by
^ POSITION (reference line)
Fig.
16
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