Replacement - HBM PACEline CMA-Serie Bedienungsanleitung

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6.2 Replacement

When replacement is necessary, in principle, both the piezoelectric transducer
and the charge amplifier can be replaced.
Example:
Only ever replace a CFT/5KN force transducer with a CFT/5kN one, or a
CMA39 charge amplifier with a CMA39 one. This ensures that there are the
same levels of sensitivity at the charge amplifier.
Charge amplifiers are adjusted individually. This ensures that when the
amplifier is replaced, the series variation is < "0.5%.
If the charge amplifier is not deployed as a measuring chain, TEDS is not
described.
ATTENTION
Replacing one of the components makes the information in
TEDS no longer valid. But it is possible, by means of the
values specified in the calibration certificate, to write the
required valid values to TEDS.
To do this, you must have write authorization for writing to TEDS and have the
relevant hardware and software available.
The correct output span can be calculated by simple multiplication from the
characteristic values of the charge amplifier and force transducer components
( see additional information in the test certificate ).
Example:
CFT/20kN force transducer
CMA158 charge amplifier
Output span Ua[V] = working force [N] x (force transducer sensitivity [pC/N]) x
(charge amplifier sensitivity [mV/pC]) /1000
Output span:
Ua= 20000 N x (−7.779 pC/N) x (−0.064 mV/pC) /1000= 9.957 V
HBM
sensitivity −7.779 pC/N
sensitivity −0.064 mV/pC
CMA
A2559−1.0 en/de/fr