Technical data

88 6000 Series Oscilloscopes Service Guide

4 Troubleshooting

If you see the waveform, but the square wave is not

shaped correctly as shown above, perform the procedure

“To compensate the analog probes” on page 88.

If you do not see the waveform, ensure your power source

is adequate, the oscilloscope is properly powered- on, and

the probe is connected securely to the front- panel analog

channel input BNC and to the Probe Comp terminal.

6 If you still do not see the waveform, use the

troubleshooting flowchart in this chapter to isolate the

problem.

To compensate the analog probes

You should compensate your analog probes to match their

characteristics to the oscilloscope’s channels. A poorly

compensated probe can introduce measurement errors.

1 Perform the procedure “To verify basic oscilloscope

operation” on page 87

2 Use a nonmetallic tool to adjust the trimmer capacitor on

the probe for the flattest pulse possible. The trimmer

capacitor is located on the probe BNC connector.

Figure 13 Example pulses

comp.cd

Perfectly compensated

Over compensated

Under compensated

6000_series_service_guide.book Page 88 Friday, March 23, 2007 2:43 PM