KERN 440 Operating Instruction

Also see for 440-21A: Service manual Operating manual

KERN 440 Operating Instruction Manual pdf 13 page image

6.5 Connection of peripheral devicesBefore connecting or disconnecting of additional devices (printer, PC) to the datainterface, always disconnect the balance from the power supply.With your balance, only use accessories and peripheral devices by KERN, as theyare ideally tuned to your balance.6.6 Initial CommissioningIn order to obtain exact results with the electronic balances, your balance must havereached the operating temperature (see warming up time chap. 1). During thiswarming up time the balance must be connected to the power supply (mains,accumulator or battery).The accuracy of the balance depends on the local acceleration of gravity.Strictly observe hints in chapter Adjustment.6.7 AdjustmentAs the acceleration value due to gravity is not the same at every location on earth,each balance must be coordinated - in compliance with the underlying physicalweighing principle - to the existing acceleration due to gravity at its place of location(only if the balance has not already been adjusted to the location in the factory). Thisadjustment process must be carried out for the first commissioning, after eachchange of location as well as in case of fluctuating environment temperature. Toreceive accurate measuring values it is also recommended to adjust the balanceperiodically in weighing operation.6.8 AdjustmentThe adjustment should be made with the recommended adjustment weight (seechap. 1 "Technical data"). Adjustment is also possible with the weights of othernominal values (see table 1), but not the optimum for measuring technique.Procedure when adjusting:Observe stable environmental conditions. A warming up time (see chapter 1) isrequired for stabilization.Switch on the balance using the key.Press key and keep it pressed, after the acoustic signal there appears in thedisplay for short time „CAL“. After that the exact size appears flashing in the display(chapter.8.4) of the adjustment weight.Now set the adjusting weight in the centre of the weighing plate.Now press the key. Short time later there appears „CAL F“, then the automaticreturn to the normal weighing mode. In the display there appears the value of theadjustment weight.An error during adjustment or the use of an incorrect adjusting weight will result in anerror message „CAL E“. Repeat adjustment.Keep the adjustment close to the balance. Daily control of the weighing exactness isrecommended for quality-relevant applications.440-BA-e-0941 13