Author Topic: REVIEW - Owon SDS7102 - A look at the SDS series from Owon  (Read 438327 times)

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Online marmad

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Re: Review of Owon SDS7102
« Reply #75 on: August 13, 2011, 09:56:55 PM »
Add 10% to price. If one of 10 unit fails. Put it to waste station or evacuate spare parts. And give new one to customer if can not easy repair immediately.

Sounds logical... and I think, as customer, worth that 10% for the first year insurance, since most of us know that electronics tend to fail right near the beginning - or else right near the end - of product life.

Eleshops current price (excl. VAT but including shipping in NL) is approx. $524 (buying $ at 3% credit card rate).  If Sergey's pricing is correct, than single unit from Owon is (with Russian market discount  ;) ) $390 plus $75 shipping = $465.  10% on top of that = $511.50 (not too far from the Eleshop price, which is ~12.5% on top) - cheaper than 2x shipping to Owon if something goes/is wrong.

And I did read in the group buy comments at samenkopen.nl that one or two people got units with malfunctioning fans - so, like any kind of insurance, you take a risk or pay more money.

P.S. No affiliation with Eleshop - other than buying my Owon from them.
« Last Edit: August 13, 2011, 10:09:17 PM by marmad »

Offline bertchai

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Re: Review of Owon SDS7102
« Reply #76 on: August 14, 2011, 11:11:34 AM »
@tinhead: "interessting, Owon told me 450$ per unit (+VAT+ ship.)"

Did Owon told you how to pay? I am located in Hong Kong, and Owon told me it is best to buy directly from them as there is no local distributor here.  I was told to TT $ directly to their HSBC bank.

Online marmad

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Re: Review of Owon SDS7102
« Reply #77 on: August 14, 2011, 04:21:50 PM »
www.messgeraete-chemnitz.de


Thanks for this link... they have a good price on the SDS battery - about € 13 cheaper than Eleshop; I think I will get it from them.

Online marmad

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Re: Review of Owon SDS7102
« Reply #78 on: August 14, 2011, 04:44:42 PM »
Here's the second part - a look at some of the faults and features of the firmware:

Edit: See Page 1
« Last Edit: May 04, 2012, 02:56:50 AM by marmad »

Offline rf-loop

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Re: Review of Owon SDS7102
« Reply #79 on: August 14, 2011, 06:03:46 PM »
@tinhead: "interessting, Owon told me 450$ per unit (+VAT+ ship.)"

Did Owon told you how to pay? I am located in Hong Kong, and Owon told me it is best to buy directly from them as there is no local distributor here.  I was told to TT $ directly to their HSBC bank.

I'm not tinhead but I know and answer "over" tinhead, sorry.

Afaik, payment method is "T/T advanced" directly to bank. You need they send proforma invoice to you and there is total. You pay it as T/T  directly on bank desk in HK or directly from your account using netbank. Write money tranfer note field your order identification what are also stated in proforma invoice. Also remember pay yourr and recipient bank possible fee.
« Last Edit: August 14, 2011, 06:33:42 PM by rf-loop »
Sales only in Finland: Siglent and some selected Owon models what we have adopted. All with our lab deep Q.C. + surplus.
>50 year hobby&profession with test gears, radio, industrial electronic and electric. In use, Siglent, Rigol, Owon, HP/Agilent, Tektronix, Rohde&Schwarz, etc
(aka: aghp, aghp55)

Offline FPGAcrazy

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Re: Review of Owon SDS7102
« Reply #80 on: August 14, 2011, 07:16:21 PM »
I like this review and I also bought the scope at the eleschop in the Netherlands a few weeks before marmad. Its quite hard to get the Rigol in the netherlands, for a decent price,  only one firm had it but it was not in stock.

I have one question for marmad. I noticed the following if the scope has a probe connected to one of its inputs it picks up the backlight inverters. The signal is approximately 4 to 8 mV. I also read in other threads that almost all cheap scopes suffer from this problem. How, does yours compare in this.

Some remarks.
The BW limit is only active at 1 and 2 mV/div not at 5 mv/div.
Large memory why/why not? Try to solve a power up problem with only 25 kpoints of memory. It is great to see your power supply switch on and capture the whole event.

P.s. Dave keep up the good work.

Offline bertchai

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Re: Review of Owon SDS7102
« Reply #81 on: August 14, 2011, 08:26:12 PM »
very nice review.  this scope looks like one for me.   :)

Offline rf-loop

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Re: Review of Owon SDS7102
« Reply #82 on: August 14, 2011, 09:09:02 PM »

Some remarks.
The BW limit is only active at 1 and 2 mV/div not at 5 mv/div.

My opinion is that it is only default. With all V/div you can shut  BW limit on or off.
1-2mV/div it go on by default but you can shut it off. (Rigol do this, Hantek do this etc)

Personally I do not like these automatic defaulting on the fly.  If I select BW limit on or off, scope need keep it as long as I change it by my self. This is normal in (all) "old" professional scopes, specially old good analog scopes.
User is master, scope is slave. User do settings, scope only follow users. Exept "auto setup".
I do not like that scope change my some settings if I change other setting.
If there come conflict settings scope must not change something itself for avoid conflict, it need only disable conflict setting and/or informate about conflict.
But some like apples some oranges.

Sales only in Finland: Siglent and some selected Owon models what we have adopted. All with our lab deep Q.C. + surplus.
>50 year hobby&profession with test gears, radio, industrial electronic and electric. In use, Siglent, Rigol, Owon, HP/Agilent, Tektronix, Rohde&Schwarz, etc
(aka: aghp, aghp55)

Online marmad

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Re: Review of Owon SDS7102
« Reply #83 on: August 14, 2011, 10:52:39 PM »
I have one question for marmad. I noticed the following if the scope has a probe connected to one of its inputs it picks up the backlight inverters. The signal is approximately 4 to 8 mV. I also read in other threads that almost all cheap scopes suffer from this problem. How, does yours compare in this.

Do you mean with probe floating - no connection to anything?

Offline FPGAcrazy

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Re: Review of Owon SDS7102
« Reply #84 on: August 14, 2011, 11:07:07 PM »
Three scenarios.
1. Probe floating (no problem)(not sure though need to check)
2. Probe ground clip connected to the circuit under investigation
3. Probe and ground shorted.

In the last two scenarios the problem arises. The inverter can be picked up easily with the pig tale, ground connected to the tip, just move the probe in front of the operation panel of the scope. I also saw Dave do this with a Tektronixs scope.

Offline tinhead

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Re: Review of Owon SDS7102
« Reply #85 on: August 14, 2011, 11:28:07 PM »
I noticed the following if the scope has a probe connected to one of its inputs it picks up the backlight inverters. The signal is approximately 4 to 8 mV. I also read in other threads that almost all cheap scopes suffer from this problem. How, does yours compare in this.


this depends on construction and backlight type,  it can be also coming from other components
like PSU here on Hameg HMO3524 (which is actually not cheap model)

Hameg HMO3524 with a bad power supply


Then of course third part EMV, as i tuned PSU on Hantek i had to shut down most everything here
to not pickup something what not produced by DSO itself, therefore only a test in controled EMV save
envoronment is something i trust.
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Re: Review of Owon SDS7102
« Reply #86 on: August 14, 2011, 11:46:51 PM »
If I select BW limit on or off, scope need keep it as long as I change it by my self. This is normal in (all) "old" professional scopes, specially old good analog scopes.
If I select BW limit on or off, scope need keep it as long as I change it by my self. Many analog scopes had less bandwidth at the highest vertical sensitivities, because an extra gain stage was switched in. The BW limit light might not come on, but that's just because the technology for this would be too complex. For example, the Tek 453A had 60MHz BW from 20mV/div, but only 40MHz at 5mV/div. And even less with both channels cascaded for higher sensitivity. The Tek 454 is similar.

Limiting the bandwidth is a nice way to hide your horrible noise performance at low signal levels. Plenty of big boys do the same.

Offline Thomas

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Re: Review of Owon SDS7102
« Reply #87 on: August 15, 2011, 12:20:43 AM »
Hm, my Rigol doesn't turn on BW limit on the highest sensitivities.
I am the Master :)

DS1052E software hacked to 100MHz, firmware 00.02.02 SP2

Offline saturation

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Re: Review of Owon SDS7102
« Reply #88 on: August 15, 2011, 12:29:11 AM »
You really showcase the usability very nicely.  A technique I use is my forefinger and thumb on my right hand in a kind of reverse "L", so I can use  my thumb for the buttons on the right screen side of the Rigol, while using my pointer finger for the buttons on the main face; I think with the Owon you can do similar between the buttons on the side of the screen and the bottom, this minimizes moving your hand around.

Given the Euro~ 60 difference between both, the Owon is a better deal given that at the very minimum its a match for the Rigol in measurement fidelity, plus natively 100 MHz.



Here's the second part - a look at some of the faults and features of the firmware:
[/url]
« Last Edit: August 15, 2011, 12:30:46 AM by saturation »
Best Wishes,


Saturation

Offline rf-loop

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Re: Review of Owon SDS7102
« Reply #89 on: August 15, 2011, 12:36:44 AM »
If I select BW limit on or off, scope need keep it as long as I change it by my self. This is normal in (all) "old" professional scopes, specially old good analog scopes.
If I select BW limit on or off, scope need keep it as long as I change it by my self. Many analog scopes had less bandwidth at the highest vertical sensitivities, because an extra gain stage was switched in. The BW limit light might not come on, but that's just because the technology for this would be too complex. For example, the Tek 453A had 60MHz BW from 20mV/div, but only 40MHz at 5mV/div. And even less with both channels cascaded for higher sensitivity. The Tek 454 is similar.

Limiting the bandwidth is a nice way to hide your horrible noise performance at low signal levels. Plenty of big boys do the same.

Yes. Example 2465 give (-3dB) 400MHz  5mV to 5V but "only" 350MHz with 2mV/div
Also temperature affect to BW.

But there is 20MHz (actually littlebit under) BW limiter button, user selectable setting. It follow My selection. I'm master and scope is just slave. This is scope settings. Amplifiers natural BW you can not select as user.
I mean user settings what user made as he use instrument. These need no change by scope,  I still keep right to think that people is more clever than oscolloscope who is designed with some peoples who have lot of lack of enough experience.
But this is my opinion just as I like more oranges than apples.
Sales only in Finland: Siglent and some selected Owon models what we have adopted. All with our lab deep Q.C. + surplus.
>50 year hobby&profession with test gears, radio, industrial electronic and electric. In use, Siglent, Rigol, Owon, HP/Agilent, Tektronix, Rohde&Schwarz, etc
(aka: aghp, aghp55)


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