Electronics > Repair
BK Precision 2120 trace issues
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vexatag:
Probes arrived, how should I use them? Set them to 10x mode and set them up like in this post?

--- Quote from: vexatag on August 06, 2020, 06:12:32 am ---So, BNC 1: red lead to signal gen out, black lead to signal gen gnd, connector to EXT. BNC 2: red lead to test point, black lead to signal gen gnd, connector to soundcard scope. Is this a correct understanding?

--- End quote ---
bdunham7:
It's been a while, remind me where you are at with your scope.  I seem to recall that you have a dot on the screen but no horizontal sweep, right?

As for your new probes and sig gen, can you just post a photo of everything so I can see it?  Far easier then explaining.  The first thing to accomplish would be to make sure you can generate a signal and view that signal on your computer/soundcard scope setup without connecting anything to the BK scope. 
vexatag:
Yes, a dot but no horizontal sweep. I'll set things up and take a picture in a little while, need to clear things out.

Edit: I also checked the probes with just the signal generator last night, got a good waveform with 1x but not 10x.

Edit 2: Sorry if I misunderstood things, is this what you wanted to see?
vexatag:
A double post, for which I'm sorry, but I'm trying to figure out what I was trying to test back in August. Was it the waveforms on a few of the pins in S603 followed by one of the pins on U601?
bdunham7:
OK, what does the input to the soundcard scope look like?

And what is wrong with your signal at 10X?  We really want to use the 10X setting if possible.

You can use the signal generator or we can just use the line trigger if you can get a good picture of it on your scope setup.  Switch S603, then pin 9 of U601 and pins 3, 5 and 5 of U603.  Screenshots would help.

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