The Whelen Strobe Check Unit is designed to determine the reason the strobe light system is not working properly. It is not necessary to be an electrical engineer to do this type of troubleshooting. 

The Strobe Check Unit will only display adequate anode and trigger voltage. You can still have open or bad discharge capacitors which will cause the flash tube not to flash. The use of a known good flash tube will determine this condition if the  strobe check confirms anode voltage. 

There are only two things that cause a strobe light system not to operate.

1. The flash tube is bad.
2. It is not getting anode voltage or trigger voltage to the system. Therefore, the power supply requires repairing.