Electronics > Beginners

Dumb Ass with a scope

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easilyconfused:
I took Dave's advice and bought an old analog scope. It' an Iwatsu SS-5710. I have no business with a scope being the t-total beginner that I am. But I convinced myself it would help me to understand things better if I connected it to my Radio Shack Electronics Learning Lab experiments. The guy wanted a $100. I offered half that. He declined so I walked. Then I went back and gave him the hundred. Anyhow it seems to be out of cal. The PDF I found says the calibration lug should output 0.3v and this one only shows 0.15v. I've tried many settings and get the same result. The time axis is out as well. I looked under the hood but didn't dare touch anything. I'm mindful that there's lots of voltage in there even when unplugged. I didn't see anything that made me feel confident about twisting them. There were a dozen or so trimmers (I guess that's what you call them), but none of them said Y adjust or X adjust so I put it back together. Can anyone suggest how to calibrate it. I doubt if I can afford to have it done professionally.

ThunderSqueak:
Take a good picture of it on so we can read everything while you are testing the calibration... just curious on how you have it setup while you are testing calibration.

easilyconfused:

--- Quote from: ThunderSqueak on July 29, 2010, 03:31:58 am ---Take a good picture of it on so we can read everything while you are testing the calibration... just curious on how you have it setup while you are testing calibration.

--- End quote ---

In this pic my settings are 50mV/0.2mSEC. I'm attached to the calibration lug and the probe is switched to the X10 scale. The PDF file calls for 0.3v and it looks to me like I have half that. I hope I'm looking at it wrong.

EEVblog:
That looks like 300mV to me!
6 divisions of 50mV

Freq looks pretty close to 1KHz, just a bit off. But this could be the calibrator and not the scope.

Dave

NiHaoMike:
That was probably 0.3Vpp.

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