Search found 4 matches

by noname
Wed Aug 24, 2011 4:27 am
Forum: DSO
Topic: DSO Quad bandwidth
Replies: 117
Views: 124565

Re: DSO Quad bandwidth

The problem with the quad is that when you are only seeing an decent representation of the waveform you are supposed to see at about 1MHz or less, this is a great limitation to the usefulness of the device. The nano seems to have about the same useful bandwidth, I bought the quad hoping it would be ...
by noname
Mon Aug 22, 2011 3:53 am
Forum: DSO
Topic: DSO Quad bandwidth
Replies: 117
Views: 124565

Re: DSO Quad bandwidth

Noname, a square wave is not a good merit to justify that the mod does nothing. After the modification the analog BW rolloff is extended to around 10MHz... In other words, the effective sampling rate of the quad as well as the analog BW of the front end is not good enough to accurately display a sq...
by noname
Mon Aug 22, 2011 3:48 am
Forum: DSO
Topic: DSO Quad bandwidth
Replies: 117
Views: 124565

Re: DSO Quad bandwidth

Furthermore, although my B channel still worked after the mod, my A channel was nothing but static. I put C73 back on and this got rid of the static but then there was ZERO signal. Nothing but a flat line no matter what. If Seeedstudio has a spare board or suggestions, please let me know.
by noname
Mon Aug 22, 2011 12:44 am
Forum: DSO
Topic: DSO Quad bandwidth
Replies: 117
Views: 124565

Re: DSO Quad bandwidth

ATTENTION, DO NOT BOTHER PERFORMING THE MOD BELOW. I just did it and I still have a damn sine wave on my screen when wave out is set to square wave at 6-8MHz (no improvement). How disappointing. This scope is pretty much worthless above 1 MHz. So much for the quad :( I have modified my scope to incr...