Opto-Isolated Current and Voltage Monitoring for High Voltage Applications
Terry Fritz began this project back in 1998. He needed a means of measuring voltage and current waveforms of the Tesla Coil primary circuit while protecting his expensive test equipment. The project has undergone 4 major revisions and although it will always be a work in progress, it has reached a level of refinement that makes it a reliable piece of HV test equipment with a bandwidth of up to 40 mhz. All of the design work presented here was done by Terry Fritz and may be found at his site of http://hot-streamer.com/TeslaCoils/Misc/. I've merely gathered the latest project information in one place and added info that I've found useful in the construction and operation of the Fritz Fiberprobes.
Theory and Operation
Probe Operation and Calibration by Terry Fritz (MS Word) (I can provide alternate format if necessary)
Info by Ross Overstreet
- fixed the voltage regular resistors that were swapped on original receiver schematic
- discovered that vasoline failed as a dielectric on the 50KV transducer after about 20 sec of run time across a 15/60 NST
- mechanical stress on the receiver PCB seems to dramatically effect the accuracy of the waveform
- using panel mount receiver detectors instead of bayonet mount will help the above problem and simplify mounting
- I suspect that both channels of the fiber cable don't have the same attenuation. We must always use the same fiber with the same channels
Probe Parts List by Terry Fritz (MS Excel) (I can provide alternate format if necessary)
Pictures of the components
Overview of fiberprobe components.
Close-Up of Receiver, Transmitters, and a 2 of the current transducers
Other High Voltage Instrumentation
This is a nifty 1000:1 RF Voltage probe with a bandwidth of 5 mhz.
It will allow me to safely probe voltages up to 15 KV(peak)
[ Back to Tesla Coil Research Home | Contact Ross ]