Hi folks,
I am new to the forum, and new to the Rigol Scope DS2072A, just got this puppy, so I am learning how to use it. One thing I notice so far is that the voltages reading are wrong, or I could be wrong. Anyway, I have one of those DC voltage reference device(cheap one, I think I paid 10 dollars or so), my Fluke 28II less than a year old indicates the correct voltages, the scope is way off. Out of four reading, one voltage(10V) is the only reading that is correct. The other three are way off.
7.5V the scope shows 7.78V
5.0 V the scope shows 5.28V, wow!
2.5 V the scope shows 2.77V
Who is wrong here? I dont think is the Fluke. I got the voltage reference right after I got the Fluke, the Fluke has not changed the reading.
To have a better idea what I am talking about, I attached some pics to this post. Yes, I recalibrate the scope after I got it. I noticed the same with A/C voltages, etc.
The scope reference voltage seems to be correct, I mean the square wave signal.