FS: USB scopes

[nigelwright7557]

I have a couple of USB PC oscilloscopes up for grabs.
One is 10 mega samples/second the other is 20 mega samples/second.
These were prototypes so just looking to get back cost of components.
Time base max is 10uS for 20 meg part and 20uS for 10 meg part.
Bandwidth is around 3MHz so good enough for audio work.
Comes with PC software that includes analogue display plus FFT.
Usual +/- 3.3 volts max input but it can be vastly increased with x10 and x100 probes.
10 meg = £20 plus p+p
20 meg = £25 plus p+p
p+p is £4-20 to UK and £14 to rest of world.

 

[truepaul]

pm sent

 

[Kokanee]

Nigel,
What operating system on PC is recommended. You just plug and play, or is there more to do.
Myles

 

[nigelwright7557]

It runs under Windows, any after XP.
It is just plug and play, no special driver needed.

 

[nigelwright7557]

 

[nigelwright7557]

One off 20 meg/samples and 3 10 meg/samples pcb's left.

Selling to recoup components cost for next project.

 

[nigelwright7557]

Trigger modes are free run, positive and negative.
Display modes are single shot or run until escape key pressed.
Max speed for 20 meg is 10uS/ div and 10 meg 20uS / div.
Great for working on analogue amplifiers.

 

[nigelwright7557]

Many thanks to those who bought 20 megs version.
Just 10 mega samples/second scopes left now.

10 meg = £20 plus p+p
p+p is £4-20 to UK and £14 to rest of world. £17-50 to Australia due to distance.

 

[Kokanee]

Hi Nigel,

The package arrived safely to BC, Canada. Now I just have to learn how to use it.

Regards,

Myles

 

[nigelwright7557]

Thanks for letting me know.
If you have any questions dont hesitate to get in touch.

 

[nigelwright7557]

Click on "display mode" then "roll until escape pressed" to get the display rolling.
You can then click on time base and voltage ranges to set them.
Once you have a reasonable size signal you can set the trigger on it.

 

[spiggs]

I have the 20 meg board and loaded the software on an old Win 7 laptop. Everything seems to work. Hooking a probe up to the calibration points gives a square wave and feeding a sign wave from my phone looks good as well.

Nigel - For us newbies would you mind giving a few pointers on how you would use this scope to say measure the output of an amp that should be clipping around 5W?

 

[nigelwright7557]

You need to connect the scope to the output of the amplifier.
You then need to work what 5 watts is as a voltage on the output.
i.e. 5 watts into 8 ohms which is about 56 volts.
Put scope probe on x10 and scope on 500mV volts voltage range.
Click on display mode then run till escape pressed.
Clipping should occurr at +/- 1 division.

 

[lgreen]

>>>>i.e. 5 watts into 8 ohms which is about 56 volts.

56 volts seems a little high to me.

 

[nigelwright7557]

Slip of the keyboard should be 6 volts.

 

[nigelwright7557]

Just a couple left now.
Trigger modes are none, positive edge and negative edge.

 

[nigelwright7557]

Price update.

10 meg = £20 plus p+p
p+p is £4-20 to UK and £14 to rest of world. £17 to USA and Australia.
Postage is at cost to me tracked.

 

[nigelwright7557]

Only a couple left now.

 

[vacuphile]

Just to feed my curiosity.

So it is possible to spend more on shipping inside the UK, than to anywhere in the whole wide world. Secret moon base?

 

[nigelwright7557]

I only charge what it costs me.
You would need to look up Post Office(R) - Helping You Get Life's Important Things Done for postal charges.