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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
control for a normal sweep display.
2. Connect the probe to the C A L 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.
Fig. 15
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 T R A C E 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
jack.Set the vertical MODE to the channel to be used.
Set the VOLTS/DIV and SWEEP TIME/DIV switch to ob-
tain a normal display of the waveform to be measured.
Set the VARIABLE control to C A L position.
APPLICATIONS
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 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 C R T screen.
Correct
compensation
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).
Over
Multiply
compensation
VOLTS/DIV setting and the probe attenuation ratio as
well. Voltages above and below the reference level are
Insufficient
positive and negative values respectively.
compensation
Using the formula:
DC level - Vertical distance in divisions x (VOLTS/DIV set-
ting) x (probe attenuation ratio).
INPUT
[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. 16)
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
the
distance
measured
Measuring point adjusted t o the center
vertical scale by o
.Ground potential adjusted by
Y POSITION (reference line)
Fig. 16
above
by
the
P O S I T I O N
1 9
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