Faulty Rigol DS1052E Receive - Page 1
Forum section: electronics / general

author: EdoReTora
author_rank: Newbie
timestamp: January 28, 2013, 10:55:37 pm
content: Hello everyone!I just got my Rigol DSO from batronix and I think they have sent a faulty one. Here is the reason;This is the photo of a xr2206 sine generator. As you can see there is a lot of unexplained distortion (2.5% max according to the datasheet).This is a pic of the following simple oscillator. This is even more blatant. So much distortion when everything should be LOW or HIGH.And finally, the photo of the oscilloscope's internal square wave generator. As you can see, not even that is a clean waveform.Any suggestions about how do i proceed for repair?

author: flolic
author_rank: Frequent Contributor
timestamp: January 28, 2013, 11:43:08 pm
content: Did you tried other channel?

author: tom66
author_rank: Super Contributor
timestamp: January 29, 2013, 02:24:19 am
content: Also, what does the internal probe calibrator look like? Could be a noisy ground... though I agree, looks a lot like some kind of odd fault...

author: PA4TIM
author_rank: Super Contributor
timestamp: January 29, 2013, 07:36:26 am
content: On both channels and with both probes ? It looks like ringing on the squarewaves. If the 7414 is on a breadboard it can give this sort of ringing. Uses the XR FG a triangle as basis ? A bad adjusted Tek FG 503 ( or something) also shows those peaks.Can you compare the signals with an other scope ?I had a Rigol DS1102E and i tossed it out because the high noise level and jitter. I really hated that scope at the end so much I gave it away.But if you are shure its the scope just bring it back. Rigol now has 3 years warranty, to bad they did not when i bought mine for 2x the price they are now. (I bought it the first year it came out, after 2 years two probes died, one button stopped working and one broke off)

author: poorchava
author_rank: Super Contributor
timestamp: January 29, 2013, 02:58:53 pm
content: XR2206 likes to generate distorted sines. I've worked with it several times and I believe it uses ordinary approach of feeding ramped voltage into diode-resistor network and adding nonlinear fragments of characteristics. I have seen some nasty voltage spikes on maxima and minima of the sine. Problems start for XER at around 300-500kHZ, so 10k should be generated totally fine. That looks disturbing.

author: EdoReTora
author_rank: Newbie
timestamp: January 29, 2013, 07:17:16 pm
content: Thank you for your responses.Now, yes, I have tried both probes and both channels and they show me the same things. I made the 7414 oscillator on a normal board, not the solderless as before, and placed the capacitor and the resistor as close as I could. The thing is that when it is free-running i get a mess. Only when i press the run/stop button I can see the square wave. Even then, sometimes, are just as much distorted as in my first post picture. Too bad, I have no other oscilloscope. That's my first.

author: PA4TIM
author_rank: Super Contributor
timestamp: January 29, 2013, 07:28:44 pm
content: Have you put the trigger source also at channel 2 ?Did you use the 10X position of the probe ?If you have to do one shot it could be a user fault.

author: EdoReTora
author_rank: Newbie
timestamp: January 29, 2013, 07:59:03 pm
content: Yes and Yes. Sorry, i don't understand your third phrase.By the way, i made a simple arduino program, where one output is being turned on and off with 1mSec delay and shows up very good. No distortion and, the most important, no trembling or dither. Which means i don't have to press the run/stop button in order to read my signal.Now i really don't know if it is my fault or the oscilloscope's.

author: 64bitDOS
author_rank: Newbie
timestamp: January 30, 2013, 11:58:04 pm
content: Make sure that the digital filter is turned off as this can sometimes introduce anomalies in the displayed waveform.HTH