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| REVIEW - Rigol DS2072 - First Impressions of the DS2000 series from Rigol |
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| neslekkim:
Similar behaviour on my ds2202a-s, did not let the scope warm up though, but ch1 moves a tiny bit. Since I have 10x probes i set my scope to adjust for that, so I adjusted to 30v when testing. (Don't know how to turn on those labels at the bottom that shows the measurements yet though, but visually, the line moves) I'm not worried though, far outside my usage-range I guess. |
| Circlotron:
--- Quote from: marmad on January 25, 2014, 12:37:12 pm --- To check if there is an offset between the pointer and what the DSO perceives as ground, set the coupling to GND. --- End quote --- When I set the coupling to ground there is ZERO offset between the pointer and the trace, both channels, and turning one channel on and off has no effect on the other channel. If I wind the sensitivity right up and set to X1 then CH1 has no offset and CH2 has +250uV offset. Using averaging to get good trace. If I short the BNC connector with a small screwdriver the CH2 offset goes down to 150uV, not zero like with GND coupling. |
| Circlotron:
What I will do next (not now, it's 1AM here ) is set the trace pointer to vertical midpoint on screen then put in a DC voltage of say +4 divisions worth and note the voltage the scope displays, then reverse polarity and see if it goes down exactly 4 divisions and what voltage is displayed. |
| JDubU:
--- Quote from: Circlotron on January 25, 2014, 11:55:26 am ---Not sure if anyone else has seen this yet - Each trace has a pointer at the edge of the screen identifying it as CH1 or CH2. With no signal in, CH2 trace lines up perfectly with CH2 pointer and so the offset reading of the trace (if any) corresponds with the trace position. For CH1 the pointer and the trace are offset by several pixels so the offset reading and the trace position are different. For example the pointer might be offset three divisions and the reading shows 3.00 volts offset but the trace is not directly over the graticule line. This is after the scope has calibrated itself after running about 6 hours. What's more, this offset of CH1 trace varies as you turn CH2 off and on. --- End quote --- On my DS2072, I found that the lineup between marker and zero input trace changed slightly with each self calibration. I got the best result by performing a self calibration in an area as far away from potential sources of EMI as possible. |
| Circlotron:
Having a further look at this offset business - at about 1 or 2 pixels below halfway up the screen there is a point where the pointer and the trace line up perfectly. The further you go up or down the screen the greater the offset between the pointer and the trace, positive offset up the screen and negative offset down the screen. What's more, if you have the peak voltage reading turned on, at 1V/div it shows 40mV at 1 div, 80 mV at 2 div etc. So the scope is actually reading some kind of voltage. Another probably related thing, if you wind the trace off the top of the screen it gets to where it says "adjustment overrange" or some words to that effect, can't remember now. But if you wind the trace off bottom of the screen, at say -20v offset position the peak voltage reading shows about 15v when there is no actual input. Hmmm.... |
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