Keysight Technologies InfiniVision 6000L Series Service Manual

Also see for InfiniVision 6000L Series: User guide

Contents

Troubleshooting 46000L Series Oscilloscopes Service Guide 57If the trace display is unusual or unexpected✔ Check that the horizontal sweep speed control setting is correct for theexpected frequency range of the input signals.✔ The sampling speed of the oscilloscope depends on the time/division setting. Itmay be that when time/division is set to slower speeds, the oscilloscope issampling too slowly to capture all of the transitions on the waveform. Use peakdetect mode.✔ Check that all oscilloscope probes are connected to the correct signals in thecircuit under test.✔ Ensure that the probe’s ground lead is securely connected to a ground point inthe circuit under test. For high-speed measurements, each probe’s individualground lead should also be connected to a ground point closest to the signalpoint in the circuit under test.✔ Check that the trigger setup is correct.✔ A correct trigger setup is the most important factor in helping you capture thedata you desire. See the User’s Guide for information about triggering.✔ Check that infinite persistence in the Display menu is turned off, then press theClear Display softkey.✔ Press the AutoScale key.If you cannot see a channel✔ Recall the default setup by pressing Save/Recall then Default Setup. This willensure that the trigger mode is Auto.✔ Check that the oscilloscope probe’s BNC connector is securely attached to theoscilloscope’s input connector.✔ Check that the probe clips are securely connected to points in the circuit undertest.✔ Check that the circuit under test is powered on.You may have pressed the AutoScale key before an input signal was available.Performing the checks listed here ensures that the signals from the circuitunder test will be seen by the oscilloscope. Perform the remaining checks inthis topic to make sure the oscilloscope channels are on, and to obtain anautomatic setup.