Combining a Constellation transmitter with the Echelon receiver module, Constellation channels are seamlessly added to the full complement of Echelon analog, digital, video, vehicle data and GPS measurement channels. All channels are synchronized and can be viewed in real-time or stored and analyzed in a variety of data formats.

Extending DAQ Performance

Key Advantages

Up to 32 Constellation modules are supported by a single Echelon receiver
Dramatically simplifies sensor wiring and setup time and expense
Data is digitized at the source, improving measurement performance especially in longer signal runs and/or high EMI environments.
Uncompromising measurement performance with highly stable amplifiers featuring rates to 10 kS/s
Synchronized sampling between wireless modules as well as other analog, digital, vehicle data and video inputs.
Continuous recording, timed interval recording as well as average, peak hold, rainflow and peak/valley.
Supports 350 Ω or higher strain gage based sensors including strain gages, load cells and torque sensors
Low power architecture with high capacity battery, charging by mobile device Qi wireless or USB-C

Available in Two Varieties

Single Channel Up to 10 kS/s sample rate M8 field-wireable connector Supports ¼, ½ and full bridge devices
Eight Channel Up to 1 kS/s per channel 62 pin D-sub connector Supports ¼, ½ and full bridge devices

Expand traditional Data Acquisistion System capabilities

Previous generations of wireless sensor transmitter devices have been extremely limited in capabilities. Channel time delays are generally unspecified, there is no ability to closely synchronize multiple channels, and there are A-D and D-A converstions before reaching your DAQ system, where the signal is digitized yet again, each conversion adding noise and distortion.

The Constellation Receiver supports up to 32 simultaneous wireless sensor modules at sample rates up to 10 kS/s per channel. All data is synchronized between modules as well as with traditional wired sensor data at the echelon and streamed to SSD.

Constellation supports most 350 Ω or higher quarter, half, and full bridge devices including strain gages, load cells and torque transducers. An internal 350 Ω precision completion resistor simplifies quarter bridge connections. 3V fixed excitation provides the ability to resolve signals to less than ½ microstrain.

In addition to continuous streaming to the Echelon SSD at high or low sample rates, Constellation supports a number of data reduction capabilities including:

• Digital filtering for both time-domain and frequency-domain applications • Timer-based burst acquisition for quasistatic measurements, with low power sleep mode between acquisitions • Data reduction modes including average, peak hold, rainflow and peak/valley

Time Synchronous Data

Constellation Wireless Transmitters utilize a proprietary time synchronization capability similar to the IEEE 1588 Precision Time Protocol (PTPv2) which continuously measures and adjusts for delay times between sensors and between the Echelon receiver module to ensure transmitter modules remain synchronized with the receiver regardless of sensor position. The synchronization process involves time offset correction and sample rate correction between the Echelon master clock and the slave clocks on the Constellation Transmitters. The slave clocks synchronize with the master through event messages that are embedded with the sensor data. Acquired data is therefore continuously synchronous despite physical separation of measurements.

Timing uncertainty is also minimized due to the method of transmission to the Echelon Data Acquisition system. Competitive wireless transmitters digitize the data and subsequently send the data through a Digital to Analog Converter before digitizing the data again using a third party DAQ system. This method can cause significant time skew between wired and wireless sensors.

The Constellation Advantage

Constellation digitizes the data directly at the transmitter and sends digital data to the Echelon receiver, eliminating both time skew and induced noise on analog signal paths.

Particularly in the harsh EMI environment of electric vehicles where radiated noise can significantly affect measurement quality, a long cable is susceptible to radiated noise that overwhelms a microvolt-level strain gage signal. Constellation allows you to place the ADC close to the sensor and eliminate the long cable run!

To support a variety of installation requirements, Constellation transmitters include an internal antenna as well as a water resistant SMA connector for an external antenna. An optional cabled antenna provides coverage if the transmitter is located under a chassis or inside a compartment.

Setting up Constellation is fast and easy. During setup, the Receiver module is constantly in pairing mode searching for available Sensor Transmitters. Simply select available modules and drag them into the Channels dialog to pair them. Once Paired, the modules will continue to be wirelessly linked to the Receiver unless disconnected by the user.

Once the Transmitter is paired, it automatically appears in the Channels list with the other wireless channels, wired analog and digital channels, vehicle bus data, video, and GPS channels for display in Aspire ™software