26-07-2015, 06:47 PM
The next job was to make a longer Power Cable as the ones I have are quite short and make working on the Units a bit tricky. Two of them have Moulded Plugs and Sockets with no obvious way of taking them to bits, but the third one has Metal Shrouds.
So, take No.3 to bits and see what the score is. The Wires are surprising flimsy, especially as the Heater Supply is good for 20A. It was really just a matter of removing the old Cable and making a new one. I used Phil's splendid Silicone Insulated Wire and even got the Colours right this time - 0.5mm for the HTs and GND and 0.75mm for the Heater Wires. The addition of some bits of Heatshrink and Cable Ties finished the job off, at least for now.
Next Plug up the Waveform Generator and see what's what. Instant Panic - no +70V. How could that be? I'd Buzzed the Cable after assembly and I knew it was OK at the PSU end. After some thrashing about I had a look at the Diagrams and the +70 doesn't seem to be used at all. In fact it isn't even looped through the Units, which I why I couldn't 'See' it at the 162.
Now I've got a properly working PSU and a sensible working environment hopefully I can make some sense of the 162.
Alan
So, take No.3 to bits and see what the score is. The Wires are surprising flimsy, especially as the Heater Supply is good for 20A. It was really just a matter of removing the old Cable and making a new one. I used Phil's splendid Silicone Insulated Wire and even got the Colours right this time - 0.5mm for the HTs and GND and 0.75mm for the Heater Wires. The addition of some bits of Heatshrink and Cable Ties finished the job off, at least for now.
Next Plug up the Waveform Generator and see what's what. Instant Panic - no +70V. How could that be? I'd Buzzed the Cable after assembly and I knew it was OK at the PSU end. After some thrashing about I had a look at the Diagrams and the +70 doesn't seem to be used at all. In fact it isn't even looped through the Units, which I why I couldn't 'See' it at the 162.
Now I've got a properly working PSU and a sensible working environment hopefully I can make some sense of the 162.
Alan
