Guineafowl's latest activity

The VBRP was the much improved version. VB = Victor Balding, the founder and owner of Balding Engineering. RP = Richard Prime, the...

Yes, like most small-time machine users, I’ve set up the VFD and hoped for the best. This one’s been in use for a year; I have other old...

This, a 1961 Beaver VBRP:

Ok. I have to be careful about the selection of the resistors - running a VFD with the output open circuit can ruin it. Using high-value...

It was the multimeter measuring. The supply neutral is referenced to earth at the pole transformer, probably around 100m of cable length...

Thanks, the line trigger trick worked better, but the trace is either incomplete or slowly redrawn, presumably due to variations in line...

But the VFD isn’t a step-up type - the output is three-wire, effectively delta, 3ph at 240 Vrms phase and line voltage. It should, as I...

No neutral. The VFD output is 240 V P-P. How come it displayed the real 240 V mains ok?

Try as I might, I couldn’t get the scope to trigger properly. This is channels 1 and 2 on U and V terminals of the motor, scope set to...

Thanks! I did have CT surgery about ten years ago. This is more a side-issue of deep thenar pain, maybe tenosynovitis or basal joint...

I found some 1 mm##^2## magnet wire. My LCR meter (actually an ESR meter with L as a side function) is quite limited, so I ended up with...

Thanks - I’ll get on with building the inductors when I get a chance. I have adjusted the probes using the CAL terminal, and they were...

The ferrite toroids have arrived. Should they be wound with magnet wire, and what size, or could I use the existing rubber single flex...

Got it. Trace 1 to show CH1+CH2, invert 2 to get CH1-CH2.

Fluke manual. https://media.fluke.com/c3705bf5-ce6e-4b79-8f55-b10800bf4fdc_original%20file.pdf