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Sniffing the Rigol's internal I2C bus
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linux-works:
I did notice the built in counter stopped being reliable at 100mhz or just a bit above that, maybe 110.  it certainly did not count much above that range.

the waves did show up (I did not have square or triable, only sine) well beyond the 100mhz point.

and again, I was not talking about the 3db point, I was referring to a visual drop-off as you slowly bring the freq up and watch for vertical deflection changes.  this will be well below the '3db point' but I wanted to see where any falloff starts to happen.  it was the same point on the pre-mod and post-mod scope.

I'll see if 125mhz ends up being about 3db down.  it may very well be; but if so, then it probably was that way before the mod, as well.
marmad:

--- Quote from: linux-works on May 18, 2014, 04:53:35 pm ---I did notice the built in counter stopped being reliable at 100mhz or just a bit above that, maybe 110.  it certainly did not count much above that range.

the waves did show up (I did not have square or triable, only sine) well beyond the 100mhz point.

and again, I was not talking about the 3db point, I was referring to a visual drop-off as you slowly bring the freq up and watch for vertical deflection changes.  this will be well below the '3db point' but I wanted to see where any falloff starts to happen.  it was the same point on the pre-mod and post-mod scope.

I'll see if 125mhz ends up being about 3db down.  it may very well be; but if so, then it probably was that way before the mod, as well.

--- End quote ---

As mentioned many times before in regards to the DS2000 series (and is likely applicable to DS1000Z series as well - unless it's not using the same LMH6518 gain amp), there very well could be ZERO difference between the 70 and 100MHz models (aside from the model number, marketing, and price). There is no 70MHz BW cutoff possible with the LMH6518 chip - only 20, 100, 200, etc...
linux-works:
200+ pages of topic, sorry, can't keep up ;)

are you saying that a stock, out of the box 70mhz scope and the 100mhz version are going to test the same at the falloff point and/or 3db points?

(1000z series; I don't have the 2000 and that's a totally different scope anyway).
marmad:

--- Quote from: linux-works on May 18, 2014, 06:23:16 pm ---are you saying that a stock, out of the box 70mhz scope and the 100mhz version are going to test the same at the falloff point and/or 3db points?

(1000z series; I don't have the 2000 and that's a totally different scope anyway).

--- End quote ---

That's my guess, based on what Rigol did with the DS2000. But I don't have one, so I can't test it.
Wim13:

--- Quote from: Orange on May 18, 2014, 04:49:13 pm ---I have an original DS1104Z, and the B/W is about 125MHz (-3dB). The build in hardware counter works OK till 110Mhz, if you go higher it gives unreliable results.

Perhaps RIGOL has done some other limiting to prevent B/W upgrades on the 70MHz model.....

I still think this is an amazing piece of test gear for the money....especially if you add the triggers, decoding and memory options :)

--- End quote ---

I measured an upgraded 1074 ( with Marconi sig.gen. 2019a, level -20 dBm)

 10 Mhz  0 db
 70 Mhz -1.1
 80 Mhz -1.5
 90 Mhz -1.7
100 Mhz -2.0
110 Mhz -2.4
120 Mhz -2.7 counter still working
130 Mhz -3.0 counter not working
160 Mhz -4.0
200 Mhz -5.4

300 Mhz -10 dB
400 Mhz -16 dB

So thats well within specs for a 100 Mhz DSO. no complains.
And seems to be the same as Orange measured on his 1104
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