Troubleshooting, Waveform parameters display, 5 troubleshooting – Velleman PCSU1000 DSO User Manual

Page 7: 6 waveform parameters display

Contents

1.5

Troubleshooting

Spectrum analyzer doesn't work

No arithmetic coprocessor in the computer.

No signal on the oscilloscope display

No communication with the computer (check that the cable is connected to the USB port)

If USB cable is connected, close the program. Disconnect and reconnect the USB cable and run
the Pc-Lab2000 program again.

RUN button is not ON.

The channel concerned is OFF.

TIME/DIV switch is in the wrong setting.

TRIGGER is ON, set TRIGGER OFF

The unit input selection is at GND.

Y position is wrongly adjusted.

Input amplitude is too large, adjust VOLTS/DIV setting.

If the above tips have no effect, then test on a different computer or different USB port.

Note. Close the program before disconnecting the USB cable.

1.6

Waveform Parameters Display

When the menu option "Waveform Parameters" of the View menu is selected the software
automatically calculates various voltage and time parameters of a signal, such as DC mean,
amplitude, rise time etc.
These parameters are displayed in a separate window. Use the check boxes in the window to select
the parameters you which to be displayed.

You may select the parameters to display for frozen waveform as well.
You may even re-open saved waveform data file to perform these measurements.
Please Note: Do not change the scope settings when the re-opened waveform parameters are to be
read.

The green labeled parameters (High, Low, Amplitude, Rise time and Fall time) are mainly intended for
pulse shaped waveform measurements only.

For proper waveform measurement the signal levels must be appropriate. Signal levels too small will
result in noisy and inaccurate measurements. Signal levels too large will result in clipping and yield
incorrect results.

Error indication:

Indicates that clipping has occurred.

???

Indicates that there are too few or too many wave cycles in the waveform data or the signal
amplitude is too low. Also too noisy signal and variable frequency signal causes this
indication.