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3.6 Application of arithmetical operation in
communication signal analysis
Interruption of a certain serial data communication link may be caused by poor signal
quality. An oscilloscope is set to display the transient state of serial data stream so as
to check the electric level and the jump time of the signal.
It is a difference signal, and the waveform can be displayed better by using the
arithmetical function of the oscilloscope.
The following steps can be carried out by activating the difference signal connected to
channel 1 and channel 2:
1. Press [CH1] to set the attenuation of the “PROBE” option as 10×.
2. Press [CH2] to set the attenuation of the “PROBE” option as 10×.
3. Set the switch on the probe as ×10.
4. Press [AUTO].
5. Press [MATH] to display the “MATH” menu.
6. Set “OPERATION” as “－”.
7. Select “CH1-CH2”, and represent the difference of the waveforms of channel 1 and
channel 2 by the arithmetical operation results.
8. Press the fourth and fifth function options to regulate the vertical scale and position
of the arithmetical operation waveform.
Two probes should be compensated at first, and the differences of the probe
compensation may cause errors of the measurement results.
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