Products > Test Equipment
REVIEW - Rigol DS2072 - First Impressions of the DS2000 series from Rigol
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Harvs:

--- Quote from: jsykes on June 04, 2013, 04:04:18 am ---I did experience what I thought was a problem with the 2202. After powering it up cold with channel 1 & 2 set at max sensitivity of 500uV/div, the DC balance takes about 10 minutes of warm-up to settle. (see attached screen shots) Performing a self cal did not correct the issue. I returned it to Rigol NA and they shipped another one again, with no questions asked. Sadly it exhibits the same behavior so I can only assume they all have this issue. :(
I haven't seen any posts about it so has anyone else noticed this?

--- End quote ---

Yes mine does the same, at least as bad as what you've described,and strangely enough only on channel 1.  CH2 is steady from boot.  Also I needed to do a self-cal on mine right from the outset, even after warm up it was off by at least 3 div on 500uV/div.

However, no big deal.  Just let it warm up before you use that range.
Wim13:

On power up at 500 uV:

On my 2072, ch 2 was steady, and ch1 was 1 div off after warm up. Not bad on 0.5 mV
and 1 dev noise on normal,  with terminator on.


a self-cal was done yesterday.
IanJ:

--- Quote from: neilhao on June 04, 2013, 06:36:22 am ---Rigol will give their Agents some discounts. This is why Tequipment.net could offer free shipping. The discounts to the Agents could even be 40% of the list price I think.
--- End quote ---

Many years ago I was in the electronics retail trade (as a trade supplier/importer) and the markup the shops we supplied made was in the order of 60% on average.
It was a real eye opener seeing what we actually purchased the goods for.

Ian.
marmad:

--- Quote from: jsykes on June 04, 2013, 07:08:04 am ---TENEYES
Thanks for the tips. For this test there was nothing connected to the inputs. I tried terminating the inputs with 50 ohms and there was no difference but I think the noise @ this 200MHz bandwidth is quite good and I am satisfied with the 2202. It was the 4022 that bothered me a bit with 3.5mV noise. The 3 division thermal drift on channel 1 is annoying but If I need to use the 500uV range I just let it warm up for 10 minutes. The trigger level doesn't seem to have any effect on the thermal drift.                                               

--- End quote ---

@jsykes: Welcome to the forum! Thanks for pointing this out (mine does the same), but I do have to wonder if it's really an issue. I was always taught to let T&M equipment warm up - granted, that was mostly in an analog era  ;) - but it still seems to be applicable nowadays (hence the 30 minute warm-up before calibration). And since the DS2000 has the extra sensitive front-end (500uV), it perhaps makes even more sense.
van-c:
I may have missed this from all the discussion about how self calibration clears the trial counters:  So, how does one calibrate a new scope yet preserve the counters?

--Van
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