6V6 line preamp

[Salas]

PicoScope Oscilloscope Software: Spectrum Analyzer Mode

http://www.picoscope.tv/general/spectrum-mode.html

 

[stajo]

Fabulous. Does this say anything? 10 Hz to 20 kHz

 

[Salas]

The horizontal is scaled in MHZ. Make that to 20kHz first and give it a -10dbV RMS gen feed at 1kHz. Don't auto sweep it.

 

[stajo]

Maybe this? But the highs and lows are moving constantly

 

[Salas]

Turn off the sweep mode. Take out that tick mark. Else its jitter.

 

[stajo]

I surely have to read up on this. Like this?

 

[Salas]

Better but too much noise floor. Read how it does log scale horizontal and how it goes to 16bit virtual mode. Maybe it boxcar averages bcs it should be 12dB natively.

 

[stajo]

I will. I had to undress some belgian consultants by phone and down some beers in the meantime to not go crazy. Sorry for my bad concentration.

One thing about me: im unreachable if only telling me what to do, you have to tell me why, otherwise my cognition doesnt work.

So excuse me fot the dumb question but I have to ask: What are we looking for and how does it show?

 

[Salas]

We are looking for a clean high signal line and low harmonics on a low enough noise floor. Something in the general looks of the attachment. That one comes from a KT88 power amp I did in the past. You can see the 50Hz hum level, the harmonics of 1kHz, the interference, the general noise level.

 

[stajo]

Ok thanks. Any hints on those settings?

 

[Salas]

See with 16k-32k bins so it can be fast, magnitude, Blackman Harris, dbV. It only does vertical log unfortunately so leave it to linear scale.

 

[stajo]

Seems like I can go up to 512 then it disappears

 

[Salas]

We already see portion of audio band at -92dbV DUT/instrument combined noise floor (0dbV=1VRMS), -72dBV hum at 50Hz. You only got a 100Hz portion though. There is a menu that selects bandwidth, and there is a generator menu that selects test frequency.

 

[stajo]

I am very pleased with this. I have had the pleasure to learn instrumenting and measurments from master degree teacher.

I will continue my struggle, maybe I will ask you again. Thank you so much for your help Salas. You are the best, we (I) are a little slow sometimes.

We are here for the reason of getting and sharing knowledge. There is no better place.

Thx

 

[Salas]

I am not particularly good in instrumentation, those are just basics I learned myself. But very useful. There are many members here that are very good in such. Chris (Anatech) was very good in it when he was posting. Has many top gear.

 

[stajo]

“If you can't explain it simply, you don't understand it well enough” Albert Einstein


and you can

 

[Salas]

Its because I did the Simplistic circuits.

 

[stajo]

I know what knowledge means, in my areas

Dont be shy

 

[Salas]

A countryman of yours put it that way:

If I have a thousand ideas and only one turns out to be good, I am satisfied.
Alfred Nobel

 

[stajo]

A countryman of yours put it that way:

If I have a thousand ideas and only one turns out to be good, I am satisfied.
Alfred Nobel

Explosive stuff