Application Examples
Using an Isola
ted Channel to Analyze a Differential Communication Signal
You are having intermittent problems with a serial data communication link, and
you suspect poor signal quality. Set up the oscilloscope to show you a snapshot o f
the serial da
ta stream so you can verify the signal levels and transition times.
This is a differential signal. Because the oscilloscope has isolated channels, you
can view the
signal with a single probe.
WARNING. Do not float the TPP0101 or TPP0201 probe reference lead to >
30 V
RMS
. Use the P5120 probe (floatable to 600 V
RMS
CAT II or 300 V
RMS
CAT III)
or similarly rated, passive, high voltage probe (not the ground referenced P5100
probe), or an appro priately rated, high voltage, differential p robe when floating
the reference lead above 30 V
RMS
, subject to the ratings of such high voltage probe.
To avoid electric shock when using probes with exposed metal parts, do not
connect the reference lead to voltages above 30 V
RMS
.
To view the differential signal, follow these steps:
1. Co
nnect the probe tip to one side of the signal.
2. Connect the probe reference lead to the other side of the signal.
3. Push the AutoSet .
For a more stable display, push the Single to control the acquisition of the
waveform. Each time you push the , the oscilloscope acquires a snapshot of the
digital data stream. You can use the cursors or automatic measurements to analyze
the waveform, or you can store the waveform to analyze later.
44 TPS2000B Series Digital Oscilloscope User Manual
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