cupoftea
Advanced Member level 5
Hi,
We wish to probe the signals/pins on our L4981B PFC controller while its driving a 1kW Boost PFC. We have a Micsig DP10007 diff probe, but, due to its long dangly probes, the signals are enevitably hopelessly swamped in common mode noise.
We don’t have an isolation transformer, and cant afford one.
I know about the serious dangers of floating our scope…but I believe the only way we can get good clean signal traces on the scope is to use a home-brew coaxial probe and solder it to the probe point on the PCB, and also literally cut off the earth lead to the scope, and then probe the circuit like this. We are aware of the potential highly serious danger to health of doing this, but we must do it.
Do you agree that the scope signal traces, when using the coax probe, will be just as “clean” as if we had used an isolation transformer, and not removed the scopes earth wire?
We wish to probe the signals/pins on our L4981B PFC controller while its driving a 1kW Boost PFC. We have a Micsig DP10007 diff probe, but, due to its long dangly probes, the signals are enevitably hopelessly swamped in common mode noise.
We don’t have an isolation transformer, and cant afford one.
I know about the serious dangers of floating our scope…but I believe the only way we can get good clean signal traces on the scope is to use a home-brew coaxial probe and solder it to the probe point on the PCB, and also literally cut off the earth lead to the scope, and then probe the circuit like this. We are aware of the potential highly serious danger to health of doing this, but we must do it.
Do you agree that the scope signal traces, when using the coax probe, will be just as “clean” as if we had used an isolation transformer, and not removed the scopes earth wire?