Shimadzu UW-2200H [123/129] A 6 performance checks

Appendices

107

A-6. Performance Checks

Not applicable to a verified balance as a legal measuring instrument in the EU

Repeatability

1 Allow the balance to warm up sufficiently by

turning ON the power and leaving it at the gram-

display at least two hours before starting the per-

formance checks.

2 Choose a weight that is near half the capacity

of the balance. Load and unload the weight five

successive times and record the following items:

Xi: Displayed value when the weight is loaded.

Yi: Displayed value when the weight is unloaded.

3 Use the formulas shown below to calculate the

values Rx and Ry.

4 Balance repeatability is considered normal

when both Rx and Ry are within five counts.

* One count corresponds to one minimum dis-

play unit of the balance model.

Notes

• Performance checks should be conducted in a room where there are no

sudden temperature changes. Refer to the installation guidelines for the

environmental factors that assure optimal performance.

• The following is a standard method used to determine whether the bal-

ance is working properly.

• The specific criterion should be set according to each user’s quality goal.

Load and unload a weight which is

near the capacity of the balance five

successive times.

Load : X1, X2, .....Xi, .....X5

Unload : Y1, Y2, .....Yi, .....Y5

Rx = X (max) − X (min)

Ry = Y (max) − Y (min)

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