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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Maybe I need another 'scope?
On Tue, 20 Nov 2018 08:08:50 -0500, Tim Schwartz
wrote: Eric, I'd suggest using a voltmeter (analog or digital, whatever you prefer)for the DC voltage measurements. I like my old Heathkit VTVM for troubleshooting, as you are unlikely to cause any serious damage to the meter, as could happen with a digital. The scope you have is all you need, as what you need it for is the AC part of the waveform. Set the scope to AC coupling at the input and you'll be looking at the ripple on the supply. If the ripple exceeds 400 volts (8 divisions at 5 volts each is 40Vp-p and with a 10x probe that gets you to 400Vp-p) then something is seriously wrong with your power supply or measurement technique, or you don't have a good ground between the amp and the scope. Regards, Tim SNIP Thanks Tim. That was just the sort of advice I was looking for. I don't have a lot of experience with oscilloscopes and every time I use mine I need to make sure I'm very careful to get everything set correctly. Eric |
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