KERN EMB Service Manual

Also see for EMB: Operating instructions Operating instructions Operating instructions

Contents

KERN EMB Service Manual Manual pdf 8 page image

6.2 Function Description1. Load cellThis is the heart of the whole system. The load cell itself is arranged as a bridge.The resistance change of the bridge elements is proportional to the load appliedon the load cell. Therefore, the output of the load cell is an analog signal,which is proportional to the load applied on the scale.2. AmplifierThe analog signal from the load cell is very small, of the order of micro-volt.Hence, a linear and stable amplifier is applied to amplify the analog signalto an appropriate level.3. A/D ConverterIn order for the analog signal can be input to the microprocessor, this partconverts the analog signal to its digital equivalent. The operation of the analogto digital converter is using a SIGMA DELTA technique and under the controlof the microprocessor.4. MicroprocessorThe microprocessor control all the functions of the scale, such as auto zero,A/D conversion, timings, weight calculation, display, overload indication,low battery indication, tare function, etc….5. DisplayThis is the part where the weight is shown out on the LCD display in digital form.The whole display is driven by the microprocessor.6. Power Regulator and Low Battery DetectorThis part contains the ON/OFF power control. In order for the external power canbe used by other parts of the scale, a regulator is used to regulate the supply.A low battery detector is employed to make sure that the power supply is strongenough for normal operation of the scale.7. KeyboardThe keyboard provides on user interface. [On/TARE], [OFF] keys are employedto operate the scale.EMB-SH-e-09338