ocilliscope questions

[madscientist]

i am starting to build some metal detectors and have some experience and was looking for a ocilliscope and was just wondering how many channel would be effective i have been looking around and found some decent ones and was just wanting some opinions

[calebsone]

at least 2 channels and 40mhz its funny i asked the same thing and thats what i was told. and so far i have found nothing i cant check as far as with metal detectors

[madscientist]

i have been looking at some of the usb/pc based ocilliscopes and it looks like most of them are 20mhz will that be sufficient?

[bernte_one]

i have a poscope mega1+ its enough for me

[Reg]

It helps to have a dual channel scope but isn't absolutely necessary to get started. Fortunately, most scopes are dual channel so the helps with the decision. As for frequency range, to get started, a 10 mhz or higher scope will usually suffice for a beginner wanting to use the scope for basic settings and adjustments.

Now, depending upon what you want to do, the smaller the signal that is the base for the vertical the better. Usually, 5 mv works but on some more advanced detectors an adjustment down to 1mv might be necessary.

Again, to get started, the 1mv ability for the vertical isn't necessary. You can always upgrade in the future if it becomes necessary.

If you don't mind used and older, a decent scope that will work fine for most applications can be purchased for $50 to $100 or so.

As an example, I have a nice $500 battery scope but my old standby bench scope is an old 10 mhz Tektronix I often use I bought from a local college for $30.

Reg

[madscientist]

i have been looking at the

Hantek 6022BE

can anyone give some advice if this scope would be sufficient enough!

[joop]

Seems like a good offer for that price...

There is a review on EEVBLOG: http://www.eevblog.com/forum/testgea...-me/msg232007/

[mohandes]

http://www.geotech1.com/forums/showt...-digital-scope

[mohandes]

which

betwen WVGA and TFT in the oscope?
whih is better?
WVGA is 7inch and TFT 5.7inch.
explain please

[Tepco]

Obviously WVGA is larger and have better resolution, otherwise, be happy it is not CRT at 320x240 anymore. Concentrate on acquisition memory size on these things, 4K and 1M is not the same.

[mohandes]

Obviously WVGA is larger and have better resolution, otherwise, be happy it is not CRT at 320x240 anymore. Concentrate on acquisition memory size on these things, 4K and 1M is not the same.

otherwise, be happy it is not CRT at 320x240 anymore. Concentrate on acquisition memory size on these things, 4K and 1M is not the same.[/QUOTE]means TFT is better in this mode!!!

[Tepco]

Display size and resolution is one thing, larger is better usually, can be 480x640, or 800x600, it is TFT anyway, unless someone started using IPS panels. More important, from standpoint of usability and performance is acquisition memory size. For fast sampling scopes, with 250kSps to 1MSps only 4K memory is too shallow, at slower time base settings scope will reduce sampling rate to keep memory full. With 1M memory, sampling is practically always at full speed, all data and fast transients recorded and can be seen and recovered using delay and pre-trigger setting. Important difference.

[mohandes]

Display size and resolution is one thing, larger is better usually, can be 480x640, or 800x600, it is TFT anyway, unless someone started using IPS panels. More important, from standpoint of usability and performance is acquisition memory size. For fast sampling scopes, with 250kSps to 1MSps only 4K memory is too shallow, at slower time base settings scope will reduce sampling rate to keep memory full. With 1M memory, sampling is practically always at full speed, all data and fast transients recorded and can be seen and recovered using delay and pre-trigger setting. Important difference.

very good
thanks man , and i want know differrent between TFT and WVGA , and if we DISREGARD the resolution TFT better work with memory and transient recording.so i thing you r means TFT is better
see in under scopes :
DSO-5200V
GDS-1152A-U
can you say me , which is better work ?
regards

[Tepco]

Don't be confused wit this: TFT (LCD) is display panel type, same on both models. WVGA is display resolution, stands for Wide VGA, (800x480), on 5200 model, also larger 7in screen, on 1152 model screen is 5.7in, with nearly QVGA resolution (234x320 actually, should be 240x320 for QVGA). So obviously display on 5200 is better, otherwise similar (BW, sampling speed, memory...), but what is the price difference?

[mohandes]

Hmmm
if i know WVGA better i buy that
thanks man but this question for my friends and he says gds not good for example in input 50MG Hertz this lc work very bad and i think you agree to that.