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PROBE C O M P E N S A T I O N
To obtain an accurate measurement result, the probe must
be adjusted correctly before measurement.
1. Connect the probe t o the INPUT terminal and set the
control 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.
Fig. 10
T R A C E R O T A T I O N C O M P E N S A T I O N
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 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 w i t h the center graticule line using
the TRACE ROTATION control located on the front panel.
D C V O L T A G E M E A S U R E M E N T S
This procedure describes the measurement procedure for
DC waveforms.
Procedure:
1. Connect the signal to be measured t o the INPUT jack.
Set the vertical MODE t o the channel t o be used. Set the
VOLTS/DIV and SWEEP TIME/DIV switch t o obtain a
normal display of the waveform t o be measured. Set the
VARIABLE control to the CAL position.
APPLICATION
2. Set the 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
t o the desired reference level position, making sure not
t o disturb this setting once made.
3. Set the AC-GND-DC switch t o the DC position t o
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 y POSITION control.
4. Use the o
the waveform to be measured t o the center vertical
Correct
compensation
graduation line of the CRT screen.
5. Measure the vertical distance from the reference level t o
the point t o be measured, (the reference level can be
rechecked by setting the AC-GND-DC switch again t o
Over
GND).
compensation
Multiply
VOLTS/DIV setting and the probe attenuation ratio as
Insufficient
well. Voltages above and below the reference level are
compensation
positive and negative values respectively.
Using the formula:
DC level = Vertical distance in divisions x (VOLTS/DIV set-
ting) 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 t o 0.2 V and a 10:1 probe was
used. (See Fig. 11)
Substituting the given values:
DC level = 3.8 ( d i v ) x 0 . 2 ( V ) x 10 = 7.6 V
POSITION control t o bring the portion of
the
distance
measured
Measuring point adjusted t o the center
vertical scale by
.Ground potential adjusted by
POSITION (reference line)
Fig. 11
above
by
the
POSITION
17
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