Signal Conditioning
Electronic measurement hardware uses balanced resistance networks to capture the minute electrical variations produced by physical board deflection. Integrating a dynamic bridge amplifier into the testing circuit allows the millivolt-level output of a strain gauge rosette to be converted into a high-resolution voltage signal suitable for digitization. This instrument supplies a stable excitation voltage to the Wheatstone bridge circuit while monitoring the differential output voltage across the active arms.
The amplification occurs close to the sensor to prevent signal degradation over long cable runs.
Frequency Response
Measurement of rapid transient strain events during board separation or drop testing demands high operational bandwidth. A dynamic bridge amplifier maintains a flat frequency response from direct current up to fifty kilohertz to prevent the attenuation of high-frequency strain spikes. This performance allows the test engineer to record the exact acceleration forces and subsequent vibration profiles of the circuit board assembly during mechanical shock.
Lower bandwidth devices cannot capture the true rise time of these transient events, which leads to underestimating the stress on the solder joints.
Noise Reduction
Differential input filters and shielded cabling protect the low-level signal from electromagnetic interference during operation. Passive filtering inside the dynamic bridge amplifier removes high-frequency noise without introducing phase shift into the measured strain data.
