FAQ

This page should list a few commonly encountered problems related to the Pulser/DDS system.

Fatal Python error: PyThreadState_Get: no current thread, Abort trap: 6

This one is likely in the Mac OS environment. Usually, reverting to python27-apple will solve the problem.

ImportError: DLL load failed: The specified module could not be found.

If you are running Windows 7 and Python 2.7.10 32-bit, installing "FrontPanelUSB-Win-Win32-4.5.0.exe" should solve the problem.

Cannot change output amplitude

There is a jumper (P8) on the back side of the DDS board, put a jumper on Var side to enable variable amplitude. See this page.

Pulser doesn't count the PMT signal

There can be a few possibilities.

• check if the level translator on the breakout board is working correctly.

• check if the VHDL file (rather, the Xilinx project file for the Pulser) has a correct pin assignment for PMT input.