[SOLVED]Question about a datasheet

[king.oslo]

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

[8086]

2.5% accuracy? What on earth... can you link to the datasheet?

[king.oslo]

No, I cant. There is a problem with my browser. But if google "U1733C", you will find the figure several places in the sheet

I just want to know that the numbers mean

Thanks.M

[8086]

Well it's right there in the datasheet:

Accuracy is given as ±(% of reading + counts of least
significant digit) at 23 °C ± 5 °C, with relative humidity
less than 80% RH.

[king.oslo]

+ counts of least significant digit

Plus counts of least significant digit of what relative to what? The sentence sounds incomplete.

Can you please give an example?

[8086]

+ counts of least significant digit

Plus counts of least significant digit of what relative to what? The sentence sounds incomplete.

Can you please give an example?

Least significant digit of whatever range and unit you're measuring...

[alm]

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.

[king.oslo]

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.

[baljemmett]

To me, it sound strange that there can be n counts of least significant digits. There will only be one least significant digit.

It 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.

[IanB]

To me, it sound strange that there can be n counts of least significant digits. There will only be one least significant digit.

Counts is like counting. Start at 1.000

1.001 - 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 count
0.998 - that's -2 counts

And so on...

[king.oslo]

Thanks, I get it now.M