Chapter 6 Troubleshooting - Rigol DS1074B Service Manual

Chapter 6 Troubleshooting

Chapter 6 Troubleshooting
1. The screen is still dark (no display) after pressing the power key:
(1) Check whether the power is correctly connected.
(2) Check whether the power switch is really on.
(3) Check whether the fuse is burned out.
(4) Restart the instrument after finishing the above inspections.
(5) If it still does not work correctly, please contact RIGOL.
2. The signal is sampled but no waveform of the signal is displayed:
(1) Check whether the probe is correctly connected with the signal connecting
wire.
(2) Check whether the signal connecting wire is correctly connected to the BNC
(namely the channel connector).
(3) Check whether the probe is correctly connected with the item to be tested.
(4) Check whether there are signals generated from the item to be tested (you
can connect the probe compensation signal to the problematic channel to
determine which has problem, the channel or the item to be tested).
(5) Repeat the acquisition.
3. The tested voltage amplitude is 10 times greater or lower than the
actual value:
Check whether the probe attenuation ratio matches with the channel attenuation
coefficient.
4. There is waveform display but not stable:
(1) Check the trigger source: check whether the trigger source selected in
Source in the trigger menu complies with the signal channel actually used.
(2) Check the trigger type: general signals should use "Edge" trigger and video
signal should use "Video" trigger. Only when the proper trigger type is used,
can the waveform be displayed stably.
(3) Switch the Coupling mode to "LF Reject" or turn on "HF Reject" in order to
filter out the low-frequency or high-frequency noise which disturbs the
trigger.
(4) Modify the trigger sensitivity and trigger holdoff settings.
5. No display after pressing RUN/STOP:
Check whether the trigger mode in the trigger control area (TRIGGER) at the
front panel is "Normal" or "Single" and whether the trigger level exceeds the
waveform range. If yes, set the trigger level to the middle or press MODE to set
the trigger mode to "Auto".
Note: Using AUTO could automatically finish the above setting.
DS1000B Sevice Guide
RIGOL
6-1