05-02-2020, 10:32 AM
I like Amie's thinking. A lot. And even if it doesn't give the expected results in practice (it might, of course), it certainly demonstrates a high level of insight and ingenuity that is to be encouraged IMHO. I wish I'd thought of it!
My suggestions are embarrassingly obvious, so I hesitate to offer them.
However, I have a Fluke 8920A thermal RMS meter which copes well with high crest factors like this. Alternatively, didn't you buy a Rigol some time back? That does RMS pretty well - probably better than the 87 will in this context. Obviously the result is a calculation based on what's displayed on the screen.
We still have a few DU1s here. I spent the first year of my career fixing them, and am in no rush to see the insides of one again. At least they don't hurt so much now that I'm 25 years older. But I could be persuaded to measure the heater volts with my 8920A if that helps.
My suggestions are embarrassingly obvious, so I hesitate to offer them.
However, I have a Fluke 8920A thermal RMS meter which copes well with high crest factors like this. Alternatively, didn't you buy a Rigol some time back? That does RMS pretty well - probably better than the 87 will in this context. Obviously the result is a calculation based on what's displayed on the screen.
We still have a few DU1s here. I spent the first year of my career fixing them, and am in no rush to see the insides of one again. At least they don't hurt so much now that I'm 25 years older. But I could be persuaded to measure the heater volts with my 8920A if that helps.
