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Square wave question (Wavetek 288)
Square wave question (Wavetek 288)
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Old 15th July 2019, 05:34 PM   #11
cbdb is offline cbdb  Canada
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The capacitance of that cable may introduce the same effects as a uncalibrated probe, did you try the cable you used on the calibration signal out of the scope? If the generator looks square on the scope then you dont need calibration, just curious.
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Old 15th July 2019, 05:37 PM   #12
enochRoot is offline enochRoot  United States
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I tried calibrated probes too after I first saw the waves (and figured it might be the rca cable) and they showed the same attenuation. Since switching to DC, it works fine now (including with the rca cable).
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Old 16th July 2019, 07:00 PM   #13
ubergeeknz is offline ubergeeknz  New Zealand
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This may be helpful. From the Tek 475 operators manual.Screenshot_20190717_065953.jpg
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Old 16th July 2019, 07:05 PM   #14
enochRoot is offline enochRoot  United States
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Interesting. I did try 10x probes while AC coupled and the square wave attenuation was identical to using the cable. Surprised that 1hz didn't have a better response than 10hz. Of course the level isn't mentioned in that frequency response. Might be 3db down in either case.
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Old 16th July 2019, 08:45 PM   #15
ubergeeknz is offline ubergeeknz  New Zealand
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Quote:
Originally Posted by enochRoot View Post
Interesting. I did try 10x probes while AC coupled and the square wave attenuation was identical to using the cable. Surprised that 1hz didn't have a better response than 10hz. Of course the level isn't mentioned in that frequency response. Might be 3db down in either case.
Well, as you know the square wave is square in DC mode, you could probably figure it out Square wave question (Wavetek 288)
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