eBridge: Strain gauge sensor simulator, DAQ-calibrator and much more...

Brüggen-Bracht, (PresseBox) - Data acquisition systems for strain gauge sensors and other millivolt signal devices are used in most testing laboratories. Whereas many specialized devices were needed for testing the various aspects of such systems so far, this is now covered by just one self-contained device that even costs less than each of currently existing devices: The eBridge. The eBridge can be used to test both the signal conditioning instrumentation and the sensors themselves.

Simulator mode - use as calibrator:

In this mode the ebridge is used to test and calibrate electronics by replacing the sensor. Here the ebridge is excited - as would be the sensor - by the instrumentation. Sensors with sensitivities of up to 20mV/V can be simulated.

The ebridge is based - as are strain gauge based sensors - on imbalancing the built in Wheatstone bridge circuit. The bridge of a sensor is imbalanced by loading it, eBridge does this with a potentiometer. Just as in sensors, this imbalance is continuous and not - as has been general practice until now - in discrete steps.

Using the internal display, the signal of the eBridge is set such that it corresponds exactly to the signal given on the calibration sheet at a defined load - usually the full scale load. The display switch is then set to 'off', leaving nothing but the Wheatstone bridge circuit active. The resulting simulated sensor signal can be used to test, set and calibrate the instrumentation.

Excitation display: Measure voltage drop due to long cables:

Long cables cause a drop in the excitation voltage of the sensor. Until now, two additional sensor sense cables were required to regulate and compensate this drop with expensive electronics. The eBridge can display the voltage that actually reaches the sensor and the reading can be used to correct the voltage at the excitation source accordingly.

Precision mV Source - using internal bridge excitation:

The eBridge works as a self-contained mV source if the internal excitation is used instead of the external excitation. Output signals in the range of +/- 200mV can be generated precisely using the lockable 10-turn potentiometer to test the instrumentation.

Display mode: Strain gauge sensor tester:

In the display mode, strain gauge based sensors are connected to the eBridge, internally excited and the output signal is displayed in millivolts. This can be used to test whether the sensor operates as specified. The eBridge uses two internal 9V batteries to provide a precise 5V or 10V excitation source for that.

The eBridge is more than just a better strain gauge simulator. It can replace a complete strain gauge laboratory in one device. The eBridge simplifies and shortens the weary search for faults in strain-gauge based systems dramatically.

For further information visit our website: www.sensors.de

For sensor know-how, visit our online sensor compendium www.sensoren.info (in German)

disynet GmbH will be exhibiting at Sensor+Test show: 22nd-24th May 2012, Exhibition Centre Nuremberg

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