Bridge Excitation Systems for Civil Engineering Transducers
Amplifiers used in conjunction with civil engineering transducers are available in 2 bridge excitation systems: constant voltage and constant current. These two systems have their respective features shown in the table below, to permit selection according to measurement purposes and applications.
All KYOWA strain gage transducers, including those for civil engineering, are calibrated at the factory using the constant voltage system.
|Bridge Excitation System||Constant-voltage Bridge Excitation System||Constant-current Bridge Excitation System|
|Civil engineering transducers||Measurement of physical quantity possible||Measurement of physical quantity possible|
|T series transducers||Measurement of physical quantity(only engineering quantity) possible||Temperature measurement together with physical quantity possible ※|
|Applicable gage bridge||60 to 1000Ω||350Ω|
|Calculation for compensation of declined sensitivity due to cable extension||Required||Not required|
|Applications||Measurement with cable not extended too long.
Mainly for experimental measurement
|Measurement via extension cable Mainly for field measurement|
※T series is provided with temperature measuring function
The reason why constant-current bridge excitation is used for civil engineering measurement with cable extended
If a 100 m long cable with cross-section 0.5 mm 2 is used for connection between a KYOWA civil engineering transducer with bridge resistance of 350Ω and an amplifier of the constant-voltage bridge excitation system, sensitivity declines by approximately 2%. To avoid such inconvenience, it is recommended to use an amplifier of the constant-current bridge excitation system, which ensures measurement with less error.
- Reason Why Constant Current Bridge Voltage is used for Civil Enginnering Measurement with Cable Extended
※For use under corrosive liquid or gaseous environment, contact us
For use under corrosive liquid or gaseous environment, contact us
|Cable||Temperature Measurement with T Series||Bridge Excitation of Cable Measuring Instrument|