HBM CMD Serie Bedienungsanleitung Seite 80

Tips for piezoelectric measurement technology
78
S Load the device with a suitable force and make a note
of the charge displayed and the force applied.
To provide appropriate accuracy, the force used for
calibration should not be less than 30% of the maxi­
mum force to be measured with the CFW. Avoid over­
loading the sensors.
Example:
You are using force transducers under load to calibrate
your measuring chain. At a force of 10500 N, you obtain
a charge of 38600 pC.
S Calculating sensor sensitivity:
Divide the charge by the force:
38600 pC / 10500 N = 3.676 pC/N
S Adjusting the amplifier:
- In the CMD Assistant, enter the sensitivity in the
"Sensor sensitivity" field.
Now you can also define the "Physical input range".
This is the measuring range. Enter here the maxi­
mum force you want to measure.
- The CMD is scaled accordingly and your measure­
ment system is parameterized.
Once you have made all the settings, we recommend
making a further comparison with the reference measu­
ring chain.
S Load the measurement system once again and com­
pare the two measuring chains.
A2781-3.1 HBM: public
CMD