© 2018 imc Test & Measurement GmbH
imc C-SERIES - Manual, Version 4 R 3 - 2018-10-19
52 Properties of the imc C-SERIES
4.8 Measure with IEPE/ICP expansion plug
For the purpose of accomplishing a broad scope of measurement tasks, imc provides a variety of
measurement amplifiers, each appropriate for particular measurement requirements. It is necessary to
realize how the properties of the measurement amplifier used are modified by the expansion plug
connected. The measurement software must be notified of the modified measurement amplifier.
4.8.1 IEPE/ICP-Sensors
The IEPE/ICP-channels are specially designed for the use of current-fed sensors in 2-wire-configuration.
IEPE, Integrated Electronics Piezo Electric, is the standard for piezoelectric transducers. IEPE (ICP)-sensors
are typically employed in vibration and solid-borne sound measurements and are offered by various
manufacturers as solid-borne sound microphones or accelerometers under different (trademarked)
product names, such as:
The commonly used name ICP (Integrated Circuit Piezoelectric) is actually a registered trademark of the
American manufacturer "PCB Piecotronics".
This sensor type is fed with a constant current of typically 4 mA and delivers a voltage-signal consisting of
a DC-component (typ. +12 V) superimposed with an AC-signal (max. ±5 V). Typical source resistance
values (internal resistance) of ICP sensors are on the order of magnitude of max. 100 Ω.
Find here notes to the measurement with current-fed sensors.
4.8.2 ACC/DSUB-ICP2 and ACC/DSUB-ICP4
As a special accessory for voltage channels, an ICP expansion connector is available. This connector can
be used to directly connect current-fed ICP-sensors also at voltage channels. The ACC/DSUB-ICP4 is
equipped with four channels and the ACC/DSUB-ICP2 with two channels.
This (active) expansion connector having the same dimensions as the imc DSUB-plug, comes with
additional conditioning equipment built into its housing and having the following features:
·
Individual current sources for the current-fed IEPE/ICP-sensors
·
Each source: 4.2 mA (typ.), voltage swing: max. 25 V
·
Differential AC-coupling to block the signal's DC-component (approx. +12 V), typical with IEPE/ICP
·
Each channel can be switched to DC-coupled voltage measurement or current-fed IEPE/ICP
measurement (AC-coupled); ex-factory the DIP-Switch for each channel inside the connector is
switched to IEPE/ICP measurement (AC-coupled)
·
For the supply of this expansion connector, the amplifier used provides a voltage of 5 V. This voltage
is short-circuit proof and independent of the voltage supply . The maximum load is 1.35 W. The
ICP2 connector requires a maximum of 500 mW for its internal needs, the ICP4 connector requires
1 W. This means that the 5 V pin has 0.85 W or respectively 0.35 W available.
Find here the DSUB-15 pin configuration .
Technical Details: ACC/DSUB-ICP
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