A test system includes a signal generator, a plurality of transmission/reception circuits and a voltage generator. The signal generator generates a test signal. The transmission/reception circuits are connected to a plurality of transmission lines. The transmission lines each include a main line and at least one branch line connected to the main line. The transmission/reception circuits provide the test signal to the transmission lines. The transmission/reception circuits detect a response signal corresponding to the test signal. The voltage generator supplies a first reference voltage and one of the second reference voltage greater than the first reference voltage and a third reference voltage between the first reference voltage and the second reference voltage to at least one of the transmission/reception circuits.

The present disclosure provides a method for operating a measurement system that comprises at least one measurement application device and at least one device under test, the method comprising centrally configuring the measurement system for a test measurement, centrally verifying the correct setup of the measurement system, and performing the test measurement with the measurement system. In addition, the present disclosure provides a respective central test control unit and a respective measurement system.

A battery monitoring system includes a plurality of battery monitoring devices connected in series, such that each battery monitoring device is in communication with at least one adjacent battery monitoring device, and each battery monitoring device monitors battery cells. First and second interface devices are located along first and second communication paths including the battery monitoring devices. A controller controls the first and second interface devices to switch transmission modes between transmitting along the first communication path via the first interface device and the battery monitoring devices, transmitting along the second communication path via the second interface device and the battery monitoring devices, and transmitting along a third transmission mode in which a direction of the communication signals outputted from the first interface device and the second interface device to the plurality of battery monitoring devices are reversed.

Methods and apparatus for self test of safety logic in safety critical devices is provided in which the safety logic includes comparator logic coupled to a circuit under test (CUT) in a safety critical device and the self test logic is configured to test the comparator logic. The self test logic may be implemented as a single cycle parallel bit inversion approach, a multi-cycle serial bit inversion approach, or a single cycle test pattern injection approach.

A technique for testing an electronic UUT by a test apparatus includes obtaining multiple DFTs of a test signal received from the UUT with the test apparatus configured differently for obtaining each DFT. The resulting DFTs include both valid content representing the test signal and invalid content introduced by the test apparatus. The improved technique suppresses the invalid content by generating a corrected DFT, which provides minimum magnitude values for corresponding frequencies relative to the test signal across the multiple DFTs.

Test apparatus measuring relative frequency response of first and second microphones includes a rotatable carrier. First and second microphones are sealingly clamped against a mounting surface of the carrier aligned with first and second apertures therein, such apertures lying equidistant from, and on opposite sides of, the carrier's axis of rotation. The carrier initially positions the first microphone closest to an audible signal source, and the responses of the microphones to an audible excitation signal are measured. The carrier is rotated 180 degrees, and the measurements are repeated. Elongated strips of gasket material are used to align the microphones and to form a seal with the carrier. When microphones are mounted deep within an audio device, the audio device is sealingly clamped against a mounting plate, sequentially aligning the mounting plate aperture with first and second apertures of the audio device housing corresponding to first and second microphones disposed therein.

Methods and apparatus for self test of safety logic in safety critical devices is provided in which the safety logic includes comparator logic coupled to a circuit under test (CUT) in a safety critical device and the self test logic is configured to test the comparator logic. The self test logic may be implemented as a single cycle parallel bit inversion approach, a multi-cycle serial bit inversion approach, or a single cycle test pattern injection approach.

A test system includes a signal generator, a plurality of transmission/reception circuits and a voltage generator. The signal generator generates a test signal. The transmission/reception circuits are connected to a plurality of transmission lines. The transmission lines each include a main line and at least one branch line connected to the main line. The transmission/reception circuits provide the test signal to the transmission lines. The transmission/reception circuits detect a response signal corresponding to the test signal. The voltage generator supplies a first reference voltage and one of the second reference voltage greater than the first reference voltage and a third reference voltage between the first reference voltage and the second reference voltage to at least one of the transmission/reception circuits.

Embodiments of the present disclosure relate to methods of finding optimized analog measurement hardware settings of a measurement system for a target measurement. The method can include one or more of the following steps: applying initial settings to the measurement system; varying the settings over a power sweep while processing a test signal used for the target measurement or a representative signal; performing the target measurement during the power sweep, thereby determining a hardware contribution of the measurement system over the power sweep; and identifying the respective settings that lead to a minimum hardware contribution of the measurement system at various powers.

Methods and apparatus for self test of safety logic in safety critical devices is provided in which the safety logic includes comparator logic coupled to a circuit under test (CUT) in a safety critical device and the self test logic is configured to test the comparator logic. The self test logic may be implemented as a single cycle parallel bit inversion approach, a multi-cycle serial bit inversion approach, or a single cycle test pattern injection approach.