10
PW20i
HBM
A1269-2.0 en/de/fr
5
Electrical configuration and function
The electronics of the digital PW20i load cell basically comprises the following
function groups:
•
Single point load cell
•
Amplifier
•
Analog/digital converter (A/D)
•
Evaluation unit (
µ
P)
•
Power failsafe parameter storage (EEPROM)
•
Serial interface
•
Control input (trigger/stop dosing)
5.1
Function
Fig.5.1
Block diagram
The analog transducer signal is first amplified, then filtered and converted to a
digital value in the analog/digital converter. The digitized signal is conditioned
in the microprocessor and forwarded via the serial interface. All the parameters
can be stored power failsafe in the EEPROM.
The PW20i load cell is adjusted at the factory with zero load and maximum
capacity. The electronics determine a factory characteristic curve from these
measured values and use this characteristic curve to map the subsequent
measured values. Depending on the output format (COF), the following
measured values are returned:
