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PROBE COMPENSATION
For accurate measurement, perform appropriate probe cor-
rection prior to measurement.
1 . Connect a probe to the INPUT terminal, and set each
switch so that normal sweep is displayed.
2. Connect the probe to the C A L terminal on the front
panel, and adjust the S W E E P TIME/DIV switch so that
several cycles of this signal are displayed.
3 . Adjust compensation trimmer on probe for optimum
square w a v e waveshape (minimum overshoot, rounding
off, and tilt).
Fig. 11
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 T R I G MODE to A U T O . 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 T R A C E R O T A T I O N control located on the front panel.
1. DC VOLTAGE MEASUREMENT
T w o types of measurement methods are provided; ordinary
measurement and cursor measurement.
(1) Ordinary Measurement
To measure waveform D C level, carry out the following
operations:
1 . Connect the signal to be measured to the INPUT jack.
For the channel which is selected by the vertical MODE
s w i t c h , set the A C - G N D - D C switch to DC and adjust the
controls for normal s w e e p . Then adjust the V O L T S / D I V
and S W E E P T I M E / D I V controls to the optimum settings
for measurement of the waveform.
The V A R I A B L E s w i t c h should be set to C A L .
2. Set the T R I G MODE s w i t c h to A U T O and A C - G N D - D C
switch to GND. T h e trace displayed at this time is the
GND level (reference line).
Using the • POSITION control, adjust the trace position
to the desired reference level position, making sure not
to disturb this setting once made.
18
APPLICATIONS
3 . Set the A C - G N D - D C s w i t c h to the D C position to
observe the input waveform, including its D C compo-
nent. If an appropriate reference level or V O L T S / D I V
setting w a s not made, the waveform may not be visible
on the C R T screen at this point. If s o , reset V O L T S / D I V
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 C R T 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 A C - G N D - D C s w i t c h again to
GND).
Correct
To obtain the real voltage, multiply the vertical distance
compensation
value by the V O L T S / D I V indication value. When a 10:1
probe is used, further multiply the value by 1 0 . Voltages
above and below the reference level are positive and
negative values respectively.
Over
compensation
(T) When a 10:1 probe is used:
DC level = Vertical distance (div) x VOLTS/DIV setting x 10
(2) With direct measurement
Insufficient
compensation
DC level = Vertical distance in divisions x ( V O L T S / D I V
setting) x (probe attenuation ratio).
[EXAMPLE]
For the example, the point being measured is 3.8 divisions
from the reference level (ground potential).
If the V O L T S / D I V w a s set to 0 . 2 (V/div) and a 10:1 probe
w a s used. (See Fig. 12)
Substituting the given values:
DC level = 3.8 (div) x 0 . 2 ( V ) x 1 0 = 7.6 V
Measuring point adjusted to the center
vertical scale by
POSITION
Ground potential adjusted by
£ POSITION (reference line)
Fig. 12
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