User Manual

163
2) Check to see if the waveform is similar to what is expected. Make certain that the time
base is in the expected range. It is common to not see a signal if the time base is set to
sweep too fast.
3) Check the trigger type: the Edge trigger is suitable for general signals and the Video
trigger is for video signals. The correct trigger type setting can be important in obtaining
a stable display.
4) Ensure you have the correct trigger coupling. For example, a common mistake is to have
the trigger set to LF Reject from a previous measurement and forget this, making it
impossible to trigger on a low frequency signal. The Default key helps in this situation
to put the oscilloscope in a known starting state so there are no surprises. Also try the
Auto Setup button.
5) Change the setting of trigger hold off.
5. No display after pressing Run/Stop
a) Check whether the trigger Mode is “Normal” or “Single”, and if the trigger level exceeds
the waveform range. If the trigger level is set too high, adjust the trigger level to the
middle of the trace or change the trigger Mode to “Auto”.
b) Pressing the Auto Setup button might bring the waveform into view.
6. The displayed signal looks like a ladder
1) The horizontal time base may be set too slow. Try increasing the time base sweep speed
to improve the resolution of the displayed trace.
2) Lines between sampled points may cause the display to appear as a ladder when the
display is in the Vector mode. Try using the Dots mode to see if this results in a more
suitable display.
7. Failure to connect to a PC through USB interface
a) Check the I/O Setting (in the Utility menu) to make sure the setting in USB Device
matches the device currently connected. If needed, restart the oscilloscope.
8. External USB drive is not recognized
1) Check to make certain the USB flash drive is operating correctly in another instrument
or PC.
2) Check if the USB Host can work normally.
3) Make sure the USB disk being used is of the flash type, the instrument does not support
USB of hard disk type.
4) Make sure the file system of the USB storage device is FAT32.
5) Restart the instrument and then insert the USB device to verify operation.
6) If a problem persists, please contact your sales office.