Are these things I should consider bad

[N2IXK]

.5 V/div and a 10:1 probe is 5 V/div. A signal 1.75 divisions high would be 1.75 x 5, or 8.75 Vpp.

[TinCanAlley]

Originally Posted by N2IXK

.5 V/div and a 10:1 probe is 5 V/div. A signal 1.75 divisions high would be 1.75 x 5, or 8.75 Vpp.

Sorry, forgot to mention it was in 1x setting on the probe.

[andy]

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[TinCanAlley]

Originally Posted by andy

It's best to keep the probe in X10 mode unless you're looking at very low level signals. A x10 probe provides a higher input impedance 10M, instead of 1M), so it won't load down the signal as much. It also provides some over voltage protection to the scope since there is a 9 meg resistor in series with the signal. If you forget it's in X1 mode and accidentally touch something with a high voltage on it, you could easily damage the scope. In 10X mode, the worst that's likely to happen is damaging the probe.

Anything 40V and over I use the 10x.

I just about drove myself crazy wondering why I could see the ripple of AC on the DC lines, but couldn't see the DC. I thought I had all the settings correct, but still couldn't see a waveform. After realizing I wasn't going to figure it out on my own, I search the net. I figured out how to measure the voltage of DC, but still can't get a waveform. So does the DC on the B+ have a waveform? If so, how do I see it? What would be the settings other than DC coupling?

Thanks

[andy]

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[TinCanAlley]

Originally Posted by andy

You're still better off sticking to X10 unless you're at the lowest v/div setting and still can't see the signal because it's too weak. An X1 probe will tend to load down any signals you're looking at.

I'll do that. Guess I misunderstood the need for the 10x. Most of what I read and watch talked about sensitive modern circuits needing the probe. For some reason I don't think of an older television as being that sensitive with all the high voltage and other things going.

[TinCanAlley]

Okay, here are recent waveforms.

First pic is the ABL base. It measure roughly .75 volts DC and this waveform is the AC with settings of 1 volt/div and 20us time/div. Odd thing is, the AC and DC waveforms are identical.

Second pic is the ABL collector's DC waveform. It measured roughly .5 volts DC. The AC looked the same but with settings of 20m volt/div and 20us time/div.

The third pic is the B+ 125V with a setting of .5 volt/div, but with the 10x probe the display is 5 volt/div and 5ms time/div. See how fat it is? Every other wave form is a single line except for the B+ 125.

Last pic is the B+ 125V again with different settings of 1 volt/div but with the 10x probe the display is 10 volt/div and 10us time/div. The DC showed a flat line at 50 volt/div for roughly 2.5 divisions.