Technical data

80 4000 X-Series Oscilloscopes Service Guide
4 Troubleshooting
To compensate passive probes
You should compensate your passive probes to match their
characteristics to the oscilloscope’s channels. A poorly
compensated probe can introduce measurement errors.
1 Perform the procedure “To perform an Auto Scale on the
Probe Comp signal” on page 78
2 Press the channel key to which the probe is connected
([1], [2], etc.).
3 In the Channel Menu, press Probe.
4 In the Channel Probe Menu, press Probe Check; then, follow
the instructions on- screen.
If necessary, use a nonmetallic tool (supplied with the
probe) to adjust the trimmer capacitor on the probe for
the flattest pulse possible.
On the N2862/63/90 probes, the trimmer capacitor is the
yellow adjustment on the probe tip. On other probes, the
trimmer capacitor is located on the probe BNC connector.
Figure 13 Example pulses
5 Connect probes to all other oscilloscope channels (channel
2 of a 2- channel oscilloscope, or channels 2, 3, and 4 of a
4- channel oscilloscope).
comp.cdr
Perfectly compensated
Over compensated
Under compensated