Agilent Technologies 54641A, Service Manual, Page: 81 / 124

5- 5
Troubleshooting
If you cannot see a channel
If you cannot see a channel
❏
Check that the oscilloscope probe cable is securely connected to the input
connector.
❏
Check that the oscilloscope probe lead wires are securely inserted into the
connector assembly and that the probe clips make good contact with the probe
lead wires.
❏
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
Autoscale
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
Press the digital channel group key (
D15 Thru D8
or
D7 Thru D0
keys) until it
is illuminated. Use the Entry knob or Channel Select knob to scroll through
the digital channels to make sure that the desired channels are turned on.
❏
Press the Autoscale key to automatically set up all channels.
service.book Page 5 Wednesday, August 28, 2002 3:25 PM