Oscilloscope

[green]

Connect a 36" piece of wire to the probe center conductor


Thanks, looks like a good experiment. With the probe connected to the wire the 100MHz is riding on some noise frequencies. Connecting shorted probe to the piece of wire kills the noise frequency, 100MHz still there didn't seem to change amplitude. Wire is taped to a wood yard stick, rotating where the wire is aimed changes the 100MHz amplitude with probe only or shorted probe. 100MHz is probably the FM station. With no wire, scope or probe lead is acting as the antenna?

[Old cart]

Yes, probes may pick up and not all are adequately shielded. I have seen poor quality probes pick up noise from the older CRT computer monitors up to 100 ft away. when you have radio station of 100's of KW a short distance away they can raise havoc.
Using the shortest leads possible helps. Using the lowest impedance possible also helps.
If you regulaly measure low amplitude low frequency devices it is best to build, or buy a low noise differential amplifier front end. most scopes are designed for wide bandwidth and that compromises their noise characteristics considerably.

A built unit like this is an example. https://www.alphalabinc.com/product/lna10/

For a more DIY approach you could use this demo board
http://www.thatcorp.com/datashts/THA..._Datasheet.pdf
or build you own from the preamp chip (1510) that this uses.

[Matt_Rowe]

Just picked this up, guy was selling it but decided to just give it tome, works fine, no probes but i had some i had purchased just in case, 60khz, 2 channel

[Carl-NC]

Just picked this up, guy was selling it but decided to just give it tome, works fine, no probes but i had some i had purchased just in case, 60khz, 2 channel

[ATTACH]53257[/ATTACH]

Can't beat free. Looks good.

[rickb]

It's 60 MHz.

[WM6]

Just picked this up, guy was selling it but decided to just give it tome, works fine, no probes but i had some i had purchased just in case, 60khz, 2 channel

Nice "purchase". Congrats.

Hold beam intensity low,
High intensity can left trace on CR screen as well precision of signal analysis can go worse.

[surfdetector]

Just picked this up, guy was selling it but decided to just give it tome, works fine, no probes but i had some i had purchased just in case, 60khz, 2 channel

[ATTACH]53257[/ATTACH]

Congrats. The price was definitely right.

[Matt_Rowe]

Can't beat free. Looks good.

hanks, we got to talking ane is a brain cancer survivor and im still taking my chemo, so he just said to take it and good luck, i tried to give him the money but he wouldn't take, great person. probably something i would do, i give things away also if i cant get much for them.

T

[Matt_Rowe]

Nice "purchase". Congrats.

Hold beam intensity low,
High intensity can left trace on CR screen as well precision of signal analysis can go worse.

irst thing i did was get a square wave on both channels and turned the beam down,zeroed every thing in, and adjusted probes.Never used one before so i had to go watch a beginners video on you tube, but i have an associates degree in agriculture and industrial mechanics, so, where good.
f

[Matt_Rowe]

It's 60 MHz.

ooooooops, your right. i wonder how come every time i post a reply the first letter of the first word always drops down, weird.
o

[Matt_Rowe]

Congrats. The price was definitely right.

Thanks, surf, now to buy some wire and build my first coil ,have some shells coming from Don.
T

[6666]

ooooooops, your right. i wonder how come every time i post a reply the first letter of the first word always drops down, weird.
o

You can overcome it by hitting enter then type