Troubleshooting Suggestions

Please read AN-2A ~ General Applications Information.
Be sure that your oscilloscope has sufficient bandwidth to display the waveform.
Make sure that you are not exceeding the maximum voltage ratings of the oscilloscope input, any probes used, and any attenuators used. The inputs of high-bandwidth oscilloscopes can have surprisingly low maximum input voltage ratings. It is usually best to avoid connecting the signal directly to the oscilloscope's input connector - use a probe or attenuator instead, to provide some measure of protection for the oscilloscope.
Make sure that any attenuators connected to the instrument have sufficient average and peak power ratings.
Try swapping your cables and attenuators with other ones.
Try using another oscilloscope.

Some models have rear-panel switches that allow analog control voltages to override the front-panel controls. Be sure that these switches are set appropriately.
Confirm that you have set the pulse width and the pulse delay to values less that the period (i.e., 1/frequency).
Most instruments are optimized for use near the maximum rated amplitude. If you wish to operate at very low amplitudes, consider operating at a high amplitude and reducing the output with attenuators, if practical.

AC-powered instruments have fuses on the rear panel. Our current designs use two AC fuses in the power entry module (remove the power cord to access the fuse drawer) and two DC fuses in round fuseholders (remove the caps with a screwdriver). Confirm that these fuses have not blown.
Some older AC-powered instruments have fuses inside the instrument, in sockets on the main power supply board. Consult the instruction manual for the locations of these fuses. Confirm that these fuses have not blown.
DC-powered modules typically have a Zener diode soldered between the main DC power terminal and the ground terminal. When an excessive voltage is applied to the power input, this diode will typically fail as a short circuit. Confirm that any such diodes have not blown, using a multimeter.

See the GPIB Troubleshooting Checklist section of the Programming Manual. Certain less common GPIB controllers need an "EOS" character explicitly added to the end of command strings. See the "End-of-String (EOS) Issues" section of the programming manual for details.

If you require further technical support, please send an email to info@avtechpulse.com.