Jump to content
ELFORUM - Forumul electronistilor
maxente

Pareri osciloscop digital

Recommended Posts

Imi cer scuze daca am postat gresit si rog un moderator sa mute subiectul

Am vazut acest osciloscop digital si as vrea sa stiu daca e bun de ceva sau e chiar o jucarie

Vad ca merge decat pana la 1Mhz, are sonda x1,x10

Pot vedea eu o forma de semnal in primarul trafului unei susre ATX cu sonda x10?

N-am avut osciloscop pana acum si asta pare interesant ma bate gandul sa imi iau, vad ca da mura-n gura pe ecran

Cateva date despre el

 

Features:

 

Display 2.8″ Color TFT LCD

Display Resolution 320×240

Display Color 65K

Analog bandwidth 0 - 1MHz

Max sample rate 1Msps 12Bits

Sample memory depth 4096 Point

Horizontal sensitivity 1uS/Div~10S/Div (1-2-5 Step)

Horizontal position adjustable with indicator

Vertical sensitivity 10mV/Div~10V/Div (with ×1 probe)

0.5V/Div~100V/Div (with ×10 probe)

Vertical position adjustable with indicator

Input impedance >500KΩ

Max input voltage 80Vpp (by ×1 probe)

Coupling DC

Trig modes Auto, Norma, Single, None and Scan

Functionalities: Automatic measurement: frequency, cycle, duty, Vpp, Vram, Vavg and DC voltage

Precise vertical measurement with markers

Precise horizontal measurement with markers

Rising/falling edge trigger

Trig level adjustable with indicator

Trig sensitivity adjustable with indicator

Hold/run feature

Test signal Built-in 10Hz~1MHz (1-2-5 Step)

Waveform storage SD card

PC connection via USB as SD card reader

Upgrade by boot loader via USB

Power supply 3.7V Chargeable Lithium battery / USB

Dimension (w/o probe) 105mm X 53mm X 8mm

post-41498-139829586871_thumb.jpg

Link to comment
Share on other sites

Analog bandwidth 0 - 1MHz Max sample rate 1Msps 12Bits

De la 1Msps or ajungs la 1MHz bandwidth? :ras: Astia nu or auzit de Nyquist?Depinde de pret. Daca e peste 100 lei, nu merita.Asa ca jucarie e interesanta. In functie de ce faci, poate avea o oarecare utilitate sau poate sa nu valoreze nimic (de cele mai multe ori - nimic).
Link to comment
Share on other sites

Analog bandwidth 0 - 1MHz Max sample rate 1Msps 12Bits

De la 1Msps or ajungs la 1MHz bandwidth? :ras: Astia nu or auzit de Nyquist?Depinde de pret. Daca e peste 100 lei, nu merita.Asa ca jucarie e interesanta. In functie de ce faci, poate avea o oarecare utilitate sau poate sa nu valoreze nimic (de cele mai multe ori - nimic).
Latimea de banda analogica nu are nici o treaba cu rata de esantionare.
Link to comment
Share on other sites

Nu? Atunci cu ce?

 

Si un citat de pe wiki:

In analog instruments, the bandwidth of the oscilloscope is limited by the vertical amplifiers and the CRT or other display subsystem. In digital instruments, the sampling rate of the analog to digital converter (ADC) is a factor, but the stated analog bandwidth (and therefore the overall bandwidth of the instrument) is usually less than the ADC's Nyquist frequency. This is due to limitations in the analog signal amplifier, deliberate design of the Anti-aliasing filter that precedes the ADC, or both.

 

For a digital oscilloscope, a rule of thumb is that the continuous sampling rate should be ten times the highest frequency desired to resolve; for example a 20 megasample/second rate would be applicable for measuring signals up to about 2 megahertz. This allows the anti-aliasing filter to be designed with a 3 dB down point of 2 MHz and an effective cutoff at 10 MHz (the Nyquist frequency), avoiding the artifacts of a very steep ("brick-wall") filter.

Link to comment
Share on other sites

Mai exact teorema spune ca pentru ca un semnal sa poata fi refacut, rata de esantionare trebuie sa fie de 2 ori mai mare decat latimea de banda a semnalului. Latimea de banda analogica e data de viteza circuitului de S/H, de exemplu am convertoare de 30MSPS cu ABW de 180 MHz, acest lucru face posibil un lucru destul de interesant cu aplicatii in radiofrecventa, adica esantionarea Super-Nyquist sau Subesantionarea. A nu se confunda termenii "Latime de banda a osciloscopului" cu "Latime de banda", textul spune doar

is usually less than the ADC's Nyquist frequency.

Link to comment
Share on other sites

Asta pentru ca exista un mod care nu e real-time si e util doar la semnale repetitive (adica... rar de tot).Pentru ca in real-time/one-shot nu au cum sa obtina mai mult de 100 kHz analogic (poate chiar mai putin).Apropo, am vazut ca exista si DSO Quad care pare mai util, desi nu stiu la ce pret:

Two 36MS/s analog channels, Upto 72MS/s if configured to single channel. (Upgrade to Two 72MS/s analog channels, Upto 144MS/s if configured to single channel from .sys version v1.31)

Link to comment
Share on other sites

Întâmplător am avut de a face cu asemenea jucărie... Vezi că există și schemă pe net și update de firmware. Merge bine până la semnale de 100Khz după care începe să aibe erori prea mari pentru cerințele mele.

 

Cel mai bine te poți uita aici și te poți decide :

 

E o jucărie foarte bună dar are limitări...

Link to comment
Share on other sites

Banuiesc ca va referiti la acesta de jos care e de la 162$

The AD9288-40 Over clocking to achieve 72M+72M sampling frequency, so that the maximum single-channel sampling rate up to 144M.Analog channel circuit using unity gain> 150MHz op amp, so the actual 30MHz analog bandwidth is expected to do more.

 

Textul de jos la ce se refera?

 

As low power, low-cost, QFP package and other conditions of the FPGA, storage capacity is not large, so DSO203 sampling depth of the current situation for the multi-channel 4096 points per channel, single-channel work cases, 8192 points.

post-41498-139829587476_thumb.jpg

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.



×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.Terms of Use si Guidelines