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calculation of output scaling
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The 422E contains a high-gain, low-noise amplifier connected in a charge amplifier configuration. The
charge output of the transducer is transferred to the feedback capacitor of the amplifier to develop a
voltage which may be calculated using the following equation.
V
out
= 422E Scaling (mV/pC) x Transducer Sensitivity (pC/Engineering Unit)
where:
V
out
= Output of 422E in mV/Engineering Unit
the Engineering Unit may be g’s, Newtons, psi, etc., depending on the sensor
Example: A 357A12 (3 pC/g) is used with a 422E02 (10 mV/pC). Calculate the output in mV/g.
Answer: 10 mV/pC x 3 pC/g = 30 mV/g
TEDS functionality
422E units with a “T” prefix incorporate TEDS (Transducer Electronic Data Sheet) technology. Using a
TEDS capable signal conditioner, or TEDS reader, the user is able to read calibration data stored in the
sensor. Some systems allow the user to also write user data and calibration information to the 422E.
All data is formatted in accordance with IEEE 1451.4.
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