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This paper introduces a custom digital lock-in amplifier for detecting the imbalance signal of a precision audio frequency bridge. The lock-in amplifier is designed with a PXI measurement system which is equipped with a signal generator and simultaneous data acquisition adapters. The advantage of this design is that the demodulation algorithm can be flexibly reconfigured when the imbalance signal...
This paper introduces an electromagnetic rail inspection method using excitation and detection coils in an AC bridge configuration. The differential output and summing output of two detection coils in the bridge can be used to evaluate rail defects and lift-off distance, respectively. When the sensor scans a non-defective rail track, the differential output will be near zero and the summing output...
The Andeen-Hagerling AH2700A Ultra-Precision 50 Hz-20 kHz Capacitance Bridge is used to determine the magnitude and phase errors of Texas Instrument's DAC8811 16-bit Multiplying DAC. An automated testing method using a USB-SPI interface and LabViewTM to control the DAC is presented. The DAC output magnitude and phase errors are dependent on input code, input frequency, and the input voltage magnitude,...
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