IPETRONIK rolls high-speed, multi-input analog measurement module with sensor excitation

May 25, 2011 // By Christoph Hammerschmidt
IPETRONIK GmbH, supplier of mobile measurement technology in the automotive industry, has introduced a fast, eight-channel multi-input analog measurement module that offers sensor excitation. The Sx-STG was designed for mobile measurement applications that face stringent requirements for reliability, flexibility and high sample rates.

The Sx-STG measurement module It supports the user's choice of one of three different signals per measurement input: voltage, integrated circuit piezoelectric (ICP) sensors, and Strain Gauge (STG) sensors for measurements on 1/4, 1/2 and full bridge circuits. The eight analog inputs are galvanically isolated, and they cover measurement ranges with twelve unipolar and twelve bipolar voltages from ±0.01 V to ±50 V. They achieve a resolution of 16 bits and can withstand voltages of up to ±100 V. Each input has its own dual sensor excitation, which can be set individually up to a maximum of ±15 V with up to ±45 mA. An 8th-order, 4,800-Hz Butterworth filter that can be turned on and off has been integrated as the hardware filter.

The module offers channel sample rates between 1 Hz as and 40 kHz. Four different rates can be selected per module. Measurement data output is accomplished via Ethernet at a maximum speed of 100 MBit/s in accordance with IEEE 802.3 via XCPonEthernet (UDP/IP). Due to the use of a dual bus concept (CAN and Ethernet in a single cable), it will also be possible to output the measurement data directly to the CAN bus at a sample rate of up to 2 kHz once system integration is complete.

Beyond this, Mx modules and M or SIM modules can then be operated in a chain of systems. The two bus systems are decoupled to the notebook/PC using a special xBus2PC adapter cable. The data format has a 16-bit resolution (word format). Furthermore, the Sx-STG offers additional useful functions, such as adjustment of the offset and target values, shunt checks for evaluating sensor plausibility, supplementary bridge resistors that can be selected via software at 120 Ω, 350 Ω and 1000 Ω, as well as current-surge detection capabilities for the sensor excitation. As an optional extra, the module supports detection of TEDS sensors. The measurement inputs' wire breakage detection function