User Manual

162
18 Troubleshooting
Possible problems and solutions are listed below. If one of these problems is encountered, check
each possible solution listed below it. If the issue is not resolved, please contact your sales
representative.
1. The screen remains dark after power on
1) Pull out the power cord from the oscilloscope and check whether the fuse is burned out.
If the fuse is defective, please replace with a fuse of the same size and rating. If you have
questions, please contact your sales representative.
2) Connect the AC power cord to your mains supply outlet and the oscilloscope.
3) Check that AC power is available (the LED in the power switch should be oscillating in
brightness).
4) Turn the power switch on by pressing it (it only takes a light press). The panel buttons
with LEDs should all light immediately.
5) If these steps do not solve the problem, please contact your sales representative.
2. After the signal is sampled, there is no displayed waveform
1) Check that the probe is correctly connected to the signal connecting cord.
a) A typical 10X passive probe should have a resistance between the ends of the signal
conductor of 9 MΩ.
2) Check that the signal connecting cord is connected to the correct BNC input connector.
3) Check the probe by connecting it to the 1 kHz compensation signal on the oscilloscope's
front panel (adjust the compensation if necessary).
4) Verify the probe is correctly connected to the device under test.
5) Verify that there is signal generated from the item under test (for example, use a logic
probe as an independent check).
6) Press the Default button followed by the Auto Set button. If there is a waveform present
within the oscilloscope's setup range, you should see a signal.
3. The voltage amplitude measured is higher or lower than the actual value.
a) Verify that the attenuation coefficient setting of the current channel matches with the
attenuation ratio of the probe.
b) Check that the probe is compensated correctly.
c) If you have e.g. a 1X/10X switchable probe, ensure the probe's switch is in the same
position as what you've set for the channel's Probe softkey.
4. A waveform is displayed but is not stable
1) Ensure the trigger source is the channel you're viewing. The source channel is displayed
in the trigger box at the right-hand edge of the display.