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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 CAL terminal on the front
panel, and adjust the SWEEP TIME/DIV switch so that
several cycles of this signal are displayed.
3. Adjust compensation trimmer on probe for optimum
square wave waveshape (minimum overshoot, rounding
off, and tilt).
Fig. 30
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 y
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.
1. DC VOLTAGE MEASUREMENT
Two types of measurement methods are provided; ordinary
measurement and cursor measurement.
(1) Ordinary Measurement
To measure waveform DC 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
switch, set the AC-GND-DC switch to DC and adjust the
controls for normal sweep. Then adjust the VOLTS/DIV
and SWEEP TIME/DIV controls to the optimum settings
for measurement of the waveform.
The VARIABLE switch should be set to CAL.
2. Set the TRIG MODE switch to AUTO and AC-GND-DC
switch to GND. The 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.
APPLICATIONS
3. Set the AC-GND-DC switch to the DC position to
observe the input waveform, including its DC compo-
nent. 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 o
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).
To obtain the real voltage, multiply the vertical distance
Correct
value by the VOLTS/DIV indication value. When a 10:1
compensation
probe is used, further multiply the value by 10. 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
DC level = Vertical distance in divisions x (VOLTS/DIV
compensation
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 VOLTS/DIV was set to 0.2 V and a 10:1 probe was
used. (See Fig. 31)
Substituting the given values:
DC level = 3.8 (div) x 0 . 2 ( V ) x 10 = 7.6 V
POSITION control to bring the portion of
Measuring point adjusted to the center
vertical scale by < « • P O S I T I O N
Ground potential adjusted by
# POSITION (reference line)
Fig. 31
23
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