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#1
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Last edited by andy; 12-05-2021 at 07:52 PM. |
#2
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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.
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 |
#3
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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.
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 Last edited by TinCanAlley; 09-30-2013 at 02:50 PM. |
#4
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Quote:
a) 1V/div b) 100V/div jr |
#5
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With the probe in the 10x mode it would be 10 volt / div. Isn't that how it works? If I set the scope to 1 volts/div and put the probe in 10x mode, it would reduce/lower/attenuate it by a factor of 10 and the display should be read as 10 volt/div?
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 |
Audiokarma |
#6
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Okay, just grounded the ABL's base leg and the jail bars remained. The only affect it had was to brighten the screen when grounded and go back to original brightness when ungrounded. So it seems the ABL circuit isn't to blame.
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 |
#7
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Quote:
So "b" is the correct answer to my question... agree? Now, where do you set the baseline "0 volts" before probing a DC voltage? If probing a positive voltage, I set the baseline to the lowest line on the 'scope face and count divisions up from there after the DC is applied to the probe. If unsure of polarity, I set the baseline (with no voltage applied) to the center graticule line and see which way the trace goes when probing the voltage. jr |
#8
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Quote:
For the DC I put set it to GND and moved the trace to the bottom of the screen and then switched to DC. It moved up as it was positive. Since the DC was showing a waveform, I moved the baseline to the top of the first division so it would show the entire waveform.
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 |
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