Spider DSA User’s Manual
73
Figure 24: The Charge Converter
When using a charge-mode sensor connected to an inline charge converter, use
the In-Line Charge mode.
Notice that some in-line charge converters change the polarity of the signal. Do
some initial testing to verify this before running a shaker test.
TEDS
The IEEE P1451.4 "Standard for smart transducer interface for mixed mode
sensors and actuators" describes a mixed-mode communication protocol based
on existing analog connections. Mixed-mode means that both analog and digital
signals are sent over a single coaxial cable. IEEE P1451.4 also specifies the
Transducer Electronic Data Sheets (TEDS) format where transducer-specific
digital information such as transducer identification, sensitivity, location,
calibration values, and other parametric data can be stored.
Front-end hardware that can communicate with TEDS sensors can read the
digital data from the sensors and automatically configure the input settings. The
Spider systems can use TEDS to automatically import the measurement quantity
and sensitivity of connected sensors.
Figure 25: IEPE and TEDS Circuitry
Choosing the Correct Input Coupling
Accelerometers and other sensors that require the IEPE current source must have
that mode enabled to operate properly. Note that the analog high-pass filter is
enabled when IEPE is on, so measurements below 1 Hz cannot be made with
these sensors.
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