I bought mine from a dealer on E-Bay (SMTZONE) that shipped the unit directly from Hong Kong. Mine is from the new June batch and is very good.
I bought one recently on E-Bay (SMTZONE) with serial SDS7102 1312 517
Is this a new batch?
As I am a newbe I dont know what to think. Where is the explaination of the spring test?
What kind of capacitor is the 1000pF SDM: ceramic, metal, etc.?
See attached the noise test as described in msg #1332
As far as I know the first 2 digits of the s/n, in this case 13, is the year (2013 in this case). The next 2 digits, in this case 12, is the week of the year. So your scope was built during the 12th week of 2013. Not quite the June batch, but scopes built during this period have been reported by other members to have lower GND noise than earlier batches. Member dgmoore78@yahoo.com's scope is 1319, so it was built during the 19th week of 2013, which is not quite June, but it's very close. We don't know exactly when Owon started phasing in the PSU and Adapter board changes, judging by dgmoore78@yahoo.com test results, it probably was a little earlier than June.
On your noise test you have the probe connected as you would to perform the compensation adjustment, this doesn't give you a good idea of the GND noise. You need to connect
both the probe and the long ground wire to the scope's probe compensation
GND lug. You also need to make sure that the scope's bandwidth is not limited, the image you posted shows BW where the Volts/Div setting is displayed, this indicates that you had the 20MHz bandwidth limit turned on. The noise is a low level signal, so you need to set the scope to the lowest Volt/Div setting that doesn't automatically limit the bandwidth, this is 50mV/Div when you tell the scope that you are using a X10 probe. Finally, you have to set the probe's switch to X10, this is because the X1 setting changes the bandwidth of the probe to about 6MHz. Post #1330 summarizes what you have to do, if you want more details see post #1066.
The package where you received the probes contains a small spring clip that can be used instead of the long ground wire. If you use this spring for your ground connection the GND noise issue should just about disappear. You can test this the same way as explained above, just use the spring clip instead of the long ground wire.
The 1000pF SMD capacitor is most likely a ceramic capacitor, I just received the shipment from Owon, so I'm going to take a look and see what's in there.
Good luck with your new scope, and post the test results again.