KERN ECB Service Manual

Also see for ECB: Operating instructions

Contents

ECB/ECE-SH-e-0820 75.2 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 applied onthe load cell. Therefore, the output of the load cell is an analog signal, which isproportional 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 signal to anappropriate level.3. A/D ConverterIn order for the analog signal can be input to the microprocessor, this part converts theanalog signal to its digital equivalent. The operation of the analog to digital converteris using a SIGMA DELTA technique and under the control of 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 batteryindication, zero 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 can beused 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/Off] and [Tare] keys are employed tooperate the scale.