UD 2.7c "sawtooth" output

[Late]

I talked to a friend of mine who has a lot of experience in the whole field and he mentioned that the "sawtooth" might look like a capacitor's discharge curve:


This would explain the strange signal that accures when the probe is hooked up to the calibratin port at the scope which puts out a 1kHz squarewave. There the discharge curves are even more visible.

Yeah sawtooth can be a capacitor discharge. Tho it certantly isnt what the signal from cal port of scope should look like. Something is deffinately cooked inside the scope

[Felix M.]

Yeah sawtooth can be a capacitor discharge. Tho it certantly isnt what the signal from cal port of scope should look like. Something is deffinately cooked inside the scope

This shot is just the UD2.7 output because I don't have a shot of the calport signal on hand but it also shows the problem.

[Anders Mikkelsen]

It looks like your measurement is AC coupled with a pretty short time constant. How are you grounding your scope to the UD? Do you have a picture or an illustration of your setup, showing how and where you make the measurement?

[Felix M.]

I don't have pictures of my measurement setup but like I said before, my UD is floating due to the ring core transformer I use a sa power supply. Scoping the output is just a matter of connecting the probe head to one and the ground to the other output terminal.

[Late]

Yea some pictures of measuring setup would be very helpful. Also do you have set AC or DC coupling for the scope? For this measurement it should be DC

[Felix M.]

The whole sawtooth problem is due to the fried channel 1 on my scope!

It doesn't matter how you turn or change it, it just saw too much voltage and died. Channel 2 confirms that the driver works fine and produces a squarewave. There are some further problems with the bridge but that doesn't belong to the "sawtooth" section.

[Late]

It doesn't matter how you turn or change it, it just saw too much voltage and died. Channel 2 confirms that the driver works fine and produces a squarewave. There are some further problems with the bridge but that doesn't belong to the "sawtooth" section.

A okay. Yea the waveforms on ch2 looked to be as they should be