Steve Anderson wrote:Hmm, the use of attenuating probes on 'scopes does cause a bit of confusion to those new to using them. I suggest finding a couple of 'voltage references' such that you can ensure you've 'got it right' in your head. This is made worse by more modern 'scopes often doing it for you. Some sense you're using a x10 probe and do the adjustment for you, some don't. A potential source of (large) errors. Often it's obvious, you're unlikely to get 60V out of a circuit running off a 9V battery unless it's designed to do that. If still slightly unsure use a meter for DC or low-frequency signals to confirm or otherwise what you might find.
Well i used my regulated 5 12v power supply checked with multimeter then on the scope with a 5v per div so 5 volt showing one div and 12v showing 2 a bit div, then i hooked the scope back up to the ramps and they are showing up very low ......percentage of the div so Peak to peak might of been correct also low seems very bad for a high voltage circuit to put out some thing what i am seeing little confused here till i remembered some thing ,copying chris longs ramp circuit i left in a 100 k resistor the ramp is passing to a size control which would reduce the ramp size but a large amount i would think ...i will look into that i left it out on the Russian valve version of the circuit i posted a few post back .
Probes and scope set to 10x and DC
(5V test) one per div below
Use a 9V battery (on DC-coupling) as a rough reference and make sure the 'scope and/or you get it right. Or a transformer with a (say) 12V secondary where the peak-to-peak voltage should read about 34V p/p, maybe up to 20% more with no load.
i will take note and try that
What i am getting does look very low compared to what a 5v DC per div test i will look into this more ,it must be a very low waveform ?
I had to make some adjustments in my head when I encountered this on a digital 'scope for the first time. Below is an example from my 'scope. The x10 setting in the right-hand column can be changed to x1, x10, x100 and x1000 for really high voltages. So the voltages at the bottom are the 'real' volts-per-division voltages, no need to multiply them x10 in your head...
My scope can do that as well but the probe would have to match the scope adjustment then ,i have only seen 1 and 10x probes rather not do the maths bad at it as is
Yes, check every time you use a meter that the low-battery warning hasn't come on, an easy source of errors and confusion...and also during the time of usage, after 30 minutes it may come on...
I think since the battery low indicator is not on this i think this meter is a dud now for DC tests ,i am happy i picked it up and had other meters to test it against it .