公开(公告)号：US11994545B2

公开(公告)日：2024-05-28

申请号：US17728377

申请日：2022-04-25

Applicant: NATIONAL INSTRUMENTS CORPORATION

Inventor： Chin-Hong Cheah ,  Tatt-Wee Oong ,  Eric Hartner

IPC: G01R27/16 ,  G01R31/319

CPC classification number: G01R27/16 ,  G01R31/31924

Abstract: A test system may be used for obtaining accurate remote sense voltage and/or current values. A measurement instrument may provide a regulated stimulus signal to a device under test (DUT) and measure a DUT signal developed at least partially in response to the stimulus signal. A test circuit may superimpose a test signal over the stimulus signal to cause the DUT signal to be developed further in response to the test signal. The DUT signal may be used to derive a resistance of the path that couples the measurement instrument to the DUT. The measurement instrument may include a source measure unit, the stimulus signal may be a regulated voltage, and the DUT signal may be a sense voltage. The harmonics of the DUT signal may be analyzed to determine a correlation between an amplitude of a measured fundamental frequency of the DUT signal and the resistance of the path.

公开(公告)号：US20220365123A1

公开(公告)日：2022-11-17

申请号：US17728377

申请日：2022-04-25

Applicant: NATIONAL INSTRUMENTS CORPORATION

Inventor： Chin-Hong CHEAH ,  Tatt-Wee Oong ,  Eric Hartner

IPC: G01R27/16 ,  G01R31/319

Abstract: A test system may be used for obtaining accurate remote sense voltage and/or current values. A measurement instrument may provide a regulated stimulus signal to a device under test (DUT) and measure a DUT signal developed at least partially in response to the stimulus signal. A test circuit may superimpose a test signal over the stimulus signal to cause the DUT signal to be developed further in response to the test signal. The DUT signal may be used to derive a resistance of the path that couples the measurement instrument to the DUT. The measurement instrument may include a source measure unit, the stimulus signal may be a regulated voltage, and the DUT signal may be a sense voltage. The harmonics of the DUT signal may be analyzed to determine a correlation between an amplitude of a measured fundamental frequency of the DUT signal and the resistance of the path.