Technical data

74 4000 X-Series Oscilloscopes Service Guide
4 Troubleshooting
✔ Check that persistence in the Display menu is turned off,
then press the Clear Display softkey.
✔ Press the [Auto Scale] key.
If you cannot see a channel
✔ Recall the default setup by pressing [Default Setup]. This
will ensure that the trigger mode is Auto.
✔ Check that the oscilloscope probe’s BNC connector is
securely attached to the oscilloscope’s input connector.
✔ Check that the probe clips are securely connected to
points in the circuit under test.
✔ Check that the circuit under test is powered on.
You may have pressed the [Auto Scale] key before an input
signal was available.
Performing the checks listed here ensures that the signals
from the circuit under test will be seen by the
oscilloscope. Perform the remaining checks in this topic to
make sure the oscilloscope channels are on, and to obtain
an automatic setup.
✔ Check that the desired oscilloscope channels are turned
on.
a Press the analog channel key until it is illuminated.
b On models with the MSO option, press the digital
channels [Digital] key until it is illuminated.
✔ Press the [Auto Scale] key to automatically set up all
channels.