Looks like a nice DMM Peter but at this price range u wouldnt expect any thing else. Nice easy to read display and very clear layout of the controls looks really good so far looking forward to seeing you put it through its paces.
Thank you so much for the review. I have one question for measurement using 34470A. Suppose we are measuring 5V DC and we want +- 100uV accuracy. What are the challenges we will face to measure that?
The biggest issue I would guess to deal with would be the elimination of external noise, the use of shielded probe leads, good grounds and keep noisy other lab equipment either off or far away. Also be aware of the impedance of the circuit your probing as with ohms law you are putting 10Meg Ohms in parallel with the test point, in most measurement scenarios this is not an issue but with this dynamic range, it can start to be significant.
The MSD (most significant digit) dictates counts. If it can only be a 1 or 0, then it's 10,000,000* counts with 7-1/2 digits. If the MSD can be a 5, then you get 50,000,000* counts with 7-1/2 digits. [* if DMM has "over ranging", you get a few more counts; usually 10% more]
Nice review. Also important to note temperature while doing absolute measurements, like those resistance and voltage sources.
Looks like a nice DMM Peter but at this price range u wouldnt expect any thing else. Nice easy to read display and very clear layout of the controls looks really good so far looking forward to seeing you put it through its paces.
Thanks Peter. Nice DMM, but I just can't get over that name, Keysight.
Thank you so much for the review. I have one question for measurement using 34470A. Suppose we are measuring 5V DC and we want +- 100uV accuracy. What are the challenges we will face to measure that?
The biggest issue I would guess to deal with would be the elimination of external noise, the use of shielded probe leads, good grounds and keep noisy other lab equipment either off or far away. Also be aware of the impedance of the circuit your probing as with ohms law you are putting 10Meg Ohms in parallel with the test point, in most measurement scenarios this is not an issue but with this dynamic range, it can start to be significant.
@@TheBreadboardca Thank you so much.
Is your question how to setup acceptance and disqualification limits? Or you simply want to measure a random, 5 VDC signal down to the 100μV digit?
why does 7 1/2 mean 10,000,000 and not 50,000,000 count ?
The MSD (most significant digit) dictates counts. If it can only be a 1 or 0, then it's 10,000,000* counts with 7-1/2 digits. If the MSD can be a 5, then you get 50,000,000* counts with 7-1/2 digits.
[* if DMM has "over ranging", you get a few more counts; usually 10% more]