I bought SDS7102 few weeks ago and my MATH button is light blue. I saw pictures on the internet and the MATH button is white. Is that sign of new version, i can see rf-loops sds7102 has light blue button too. BTW rf-loop very nice job .
4) No ferrite! The lady from Owon said that this ferrite is attached to the LCD and so she did not send it to me. Whatever that means!
Is there a warranty void sticker on these units?
OK, I present here a picture "before" and two "after". One picture was taken with the probe cable tucked under the screen - this is the worst interference position - also you can loop the probe cable around the Owon for similar "bad" results.
Maybe the missing ferrite might help, but as it is a flat shape, has anyone got a part number I can get it from somewhere?
OK, I present here a picture "before" and two "after". One picture was taken with the probe cable tucked under the screen - this is the worst interference position - also you can loop the probe cable around the Owon for similar "bad" results.
Maybe the missing ferrite might help, but as it is a flat shape, has anyone got a part number I can get it from somewhere?
I received today the replacement adapter and PSU from Owon in China. I have received:
1) adapter board v3.0 dated 2011.11.14
2) adapter board v3.2 dated 2012.07.24
3) PSU board , no version on it, however it is slightly different to the one I have, for one it does not have a hole and a TO-220 transistor through it.
4) No ferrite! The lady from Owon said that this ferrite is attached to the LCD and so she did not send it to me. Whatever that means!
During the tests I have seen the greatest noise when the looped probe cable is near the bottom of the LCD. Does that mean that the LCD emits more noise than the adapter and the PSU together?
OK, I am changing the boards over now and will take some pictures if there are any good results.
I am not sure if the ferrite would improve matters in that configuration?
Does anyone know the details of the company? Like how many employees and how many units produced, and the history of the company?
I received today the replacement adapter and PSU from Owon in China. I have received:
1) adapter board v3.0 dated 2011.11.14
2) adapter board v3.2 dated 2012.07.24
3) PSU board , no version on it, however it is slightly different to the one I have, for one it does not have a hole and a TO-220 transistor through it.
4) No ferrite! The lady from Owon said that this ferrite is attached to the LCD and so she did not send it to me. Whatever that means!
During the tests I have seen the greatest noise when the looped probe cable is near the bottom of the LCD. Does that mean that the LCD emits more noise than the adapter and the PSU together?
OK, I am changing the boards over now and will take some pictures if there are any good results.- Oh men, adapter board v3.2. akis please converts it to v3.3, just add a capacitor.
- No ferrite!
Hey Owon... Fail!I am not sure if the ferrite would improve matters in that configuration?Is not a question of believing or not, that ferrite reduce noise.
Another link:
http://www.ebay.es/itm/190837205693
What capacitor do I need on the v3.2 to make it v3.3 ?
I was charged $60 (US dollars), $10 for the parts and $50 for the shipping. The $50 for the shipping is so high to disguise the real price and try to avoid import duty.
I think it has made quite a lot of change and is well worth it. Yes the LCD screen also makes a lot of noise, but if you keep the probe cable directly away from the scope, at 90 degrees angle, and for at least one foot (30 cm) distance, then there is absolutely no noise.
I am not sure if the ferrite would improve matters in that configuration?
Ah I missed that photo. I will open the scope again tomorrow now. By the way, the new PSU had the power on off switch 2-3 mm to the right, and the button does not fit anymore! So I had to break the plastic tabs on the button to make it fit
If this ferrite is the genuine Wurth item, as shown here http://uk.farnell.com/wurth-elektronik/7427228/ferrite-core-flat-cable-34mm/dp/1890713?Ntt=7427228
then I am surprised he sells them for a fraction of the price we pay for them in the UK....
That configuration is avoiding the near field of the TFT panel, which results in less EMI picked up by the probe cable, so you see less noise. However, keep in mind that this strong field is still present, and although it isn't impacting the probe cables, there are other nearby components, such as the Z-plate, that are affected by this field. Some of this effect results in conductive common mode noise, which you see as GND noise when it's converted to differential mode noise by the long ground lead. Installing the flat ferrite on the TFT flat cable reduces the filed, so you have dual benefits, less radiated EMI, and less conductive common mode noise.
Also keep in mind that the probe cables are susceptible to EMI from any external source, not just the TFT panel, even the DUT may be a strong source, for example an SMPS. This is why I use ferrites on the probe cables themselves.
Your observations have true base and the Vpp or Vrms will be the best for comparative results, but here we have the same methodology, the same position, the same time, the same probe, the same vertical resolution (50mV) the same or very closed horizontal time (400/500usec) and the closer memory buffer 1-2M).
Additional from what I see there is stable optical depth of camera.
I think that they are comparable.
Mine after all modifications to this test with the BNC Shorting Cap has 12-16mV (10X) on CH1 and 14-18mV on CH2.
At the last yours mesurements as the wave demonstrated, they seem like the Average measurement of SDS7102. Here another sample with this average measuement (the average was set to 4) but I don't think so that is the right measurement for the comparison