hi,

How do you ensure that the linearity is correct? is it by looking at its expected weight and measured weight?

i see that the calibrating weights are like 100g,200g etc. what about the smaller weights like 50g? it should be more difficult to keep to the accuracy at smaller weights right?

thanks,
Yumei
Tg01

Hi.

Why after calibration, weight of 200g is placed on the analytical balance to test if it is calibrated properly?

Similarly for the top-pan balance. Why use the 4kg weight and not other amount of weight like 1oog(for analytical balance) or 2kg(for top-pan balance)?

Is it stated on the protocol that comes along with the weights used for calibration of the different balances?

Thanks.

Lyn
TG02

Hi

What do you mean by 'change its setup to calibration mode'? What setup are you refering to. I only manage to do calibration of micropipette so i'm quite interested to know about calibration of balances.

Justina
TG01

Hello..

How often is calibration carried out in your lab? I did calibration for pH meter too. As for our lab, we have to calibrate everyday before using it.

Thanks

Shihui
0607135A

hello andika

i did calibration of pH meter before, at my attachment site. here, we follow a reference range and when callibration, it can only fall between +/- 0.03. do you also refer to a reference range? and if so, what are the minimum and maximum ranges for each of the equpments you calibrated?

thanks

rusydiana
tg02

hey yumei..

To check the linearity of the analytical balance, I will look at the small bubble that can be viewed on the analytical balance. The bubble must be within the circle line to ensure that it's linearity is correct

Hey lyn..

To ensure the calibration, we can use any types of weights that is provided. The reason why i choose to use 200g is because previous calibration before me test the analytical balance at 200g. Hence to standardize the procedure, 200g is preferable.

justina..

setup refers to the menu in the analytical balance. For example, when we swtich on the analytical balance the display immediately shows the amount of weight. Hence to change the display menu to calibration mode, we will have to setup the display to calibration mode by following the protocols provided.

shihui

For pH meter, it is best to calibrate it before use to ensure accuracy. However, here all instruments are to be calibrated within 5 months

rusydiana

yes here we do follow the reference range. the reference range for pH meter calibration is +/- 0.02