[SOLVED]Question about a datasheet - Page 1
Forum section: electronics / general

author: king.oslo
author_rank: Frequent Contributor
timestamp: February 17, 2012, 10:02:07 pm
content: A datasheet for an LCR meter states that it the accuracy at a specific functionality and test frequency of is 2.5% +-10. What does each of those two figures mean?Thanks.Kind regards,Marius

author: 8086
author_rank: Super Contributor
timestamp: February 17, 2012, 10:07:21 pm
content: 2.5% accuracy? What on earth... can you link to the datasheet?

author: king.oslo
author_rank: Frequent Contributor
timestamp: February 17, 2012, 10:10:38 pm
content: No, I cant. There is a problem with my browser. But if google "U1733C", you will find the figure several places in the sheetI just want to know that the numbers meanThanks.M

author: 8086
author_rank: Super Contributor
timestamp: February 17, 2012, 10:16:11 pm
content: Well it's right there in the datasheet:Quote

author: king.oslo
author_rank: Frequent Contributor
timestamp: February 17, 2012, 10:20:10 pm
content: QuotePlus counts of least significant digit of what relative to what? The sentence sounds incomplete.Can you please give an example?

author: 8086
author_rank: Super Contributor
timestamp: February 17, 2012, 10:23:31 pm
content: Quote from: king.oslo on February 17, 2012, 10:20:10 pmLeast significant digit of whatever range and unit you're measuring...

author: Unknown
author_rank: Unknown
timestamp: February 17, 2012, 10:24:49 pm
content: Dave did a tutorial about multimeter specifications, which usually use a similar format. Should be easy to find in the episode list, it was quite an early one. Least significant digit refers to the value on the display. It (usually) consists of multiple digits, one is the most significant, and one is the least significant. Multiply the least significant one by the counts you got from the datasheet and you've got your offset uncertainty.

author: king.oslo
author_rank: Frequent Contributor
timestamp: February 17, 2012, 10:30:36 pm
content: Thanks, I will watch it. The least significant digit of 120nF is 0.To me, it sound strange that there can be n counts of least significant digits. There will only be one least significant digit.

author: baljemmett
author_rank: Unknown
timestamp: February 17, 2012, 10:46:53 pm
content: Quote from: king.oslo on February 17, 2012, 10:30:36 pmIt refers to the value of the least significant digit on the display in whatever mode and range you're measuring -- so if you've got a spec of 5 counts and a reading of 1.23uF it means 0.05uF, a reading of 123nF it means 5nF, etc.. It doesn't change depending on the actual value of the reading, that's what the 'percentage of reading' spec is about.

author: IanB
author_rank: Super Contributor
timestamp: February 17, 2012, 10:48:48 pm
content: Quote from: king.oslo on February 17, 2012, 10:30:36 pmCounts is like counting. Start at 1.0001.001 - that's one count.1.002 - that's two counts.1.003 - that's three counts.etc.You count down the same way.0.999 - that's -1 count0.998 - that's -2 countsAnd so on...

author: king.oslo
author_rank: Frequent Contributor
timestamp: February 17, 2012, 10:50:59 pm
content: Thanks, I get it now.M