please can you explain how to calculate accuracy for the digital multimeter hmc8012? i found the tables in the data sheet, but am not sure how to interprete these values.
let's take a dc voltage measurement as example for the calculation. it is important to set the zero point of the measurement section (using the [null] key) for best accuracy. zeroing is done. we measure a voltage of 13,85 v. to perform the calculation we need to refer to the following table:
for a result of 13,85v the 40v range has been selected.
this leads into
if the environment temperature range is not within 18-28°c, an additional temperature coefficient must be factored in. in our example we choose the environment temperature to be 30°c, meaning a temperature deviation of 2 k.
for each kelvin below or above those 18-28 °c
must be added.
all in all we have an accuracy of 2,77 mv 0,8 mv 2* 0,1385 mv 2 *0,2 mv = 4,247mv (2 times temperature coefficient each because of 2 k deviation from 28 °c).
result: the real voltage value is in a range between 13.845753 and 13,854247 v.
please find a certainty calculator for the hmc8012 in the attachment of this article. this article was written according to fw version 1.400