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In Reply to: RE: Keysight/Agilent U1241B - amp output noise measurement posted by 91derlust on August 26, 2015 at 03:36:43
All meters have limitations. Most don't make you aware of them. People assume because they see a number they can take it to the bank. Even understanding supposed accuracy can be difficult as most are a % of the meters Full scale range....and not the range you are set at.
And then that meter isn't really an Agilent. Their stuff was never cheap but it does what it claims. These days you might could get a basic 4.5-5.5 digit benchtop of theirs for 5-600$. Still your input generally has to be at least 5% of the range you set the meter at.
So yes, what you have is accurate to what it claims.....provided the input voltage is great enough. They do make that fact clear in their specs (unlike most).
Follow Ups:
I am hoping Keysight can provide some additional info so I know exactly what it can read and how accurately.
Their brochure states measurement from 0.1mV to 1000V. Their datasheet then introduces the 5 - 100% condition, which appears not to be clear going by the comments to this thread.
What I would expect is that it can read from 0.1mV to 1000mV (when ranged to mV), but its guaranteed accuracy is only applicable between 5% to 100% of that range. But, what I am seeing is that it may only read from 5%, which is misleading, whether intentional or not.
Otherwise, it seems like a nice (even extravagant) meter to have the kit for basic DIY.
Regards,
91.
"Confusion of goals and perfection of means seems to characterise our age." Albert Einstein
I think it just means that the "True RMS" reading is only valid in that range. (5% to 100% of the range selected)Your meter is accurate to 1% of 0.1mV (0.001mV)
However the last digit is accurate to 5 counts, so 0.001mV might actually read 0.005mV due to a resolution limit in the analog to digital converter for the display.That is probably why the true RMS readings are off a little bit when measuring under 50mV.
Hope that clears things up.
Infamous sockpuppet
Edits: 08/28/15
Yes, that is what I am hoping for.
"Confusion of goals and perfection of means seems to characterise our age." Albert Einstein
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