An automatic weighing instrument is developed

which can automatically and immediately calculate the weight of material in bucket of a loader.Improving weighing accuracy plays an important role in designing automatic weighing instrument based on the hardware.Therefore

kinds of factors causing errors are discussed

and then elimination method

improved Akima interpolation and other related solving methods are presented.The choke points of the loader’s weighing system have been solved

and the weighing accuracy is up to 1 %.Moreover

a simple and feasible debugging method which fits the fieldwork of debugging is put forward.In real operation

it is show that the automatic weighing instrument has some good performances

such as high integration

high weighing accuracy and high reliability.