发明名称 |
Contact check for remote sensed measurement |
摘要 |
A contact resistance check circuit and method for verifying that a sufficient electrical connection is established between a source and a sense lead of a Kelvin connection. The circuit includes a microprocessor for driving a transformer that is connected to the source/sense probe (i.e., contact resistance) with an input pulse. The input pulse is altered in relation to the magnitude of the contact resistance to produce a check pulse. A comparator is used to compare the check pulse with a threshold voltage and for generating a fault indication signal. A flip flop then stores the fault indication signal so that the fault indication signal may be monitored by the microprocessor.
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申请公布号 |
US5999002(A) |
申请公布日期 |
1999.12.07 |
申请号 |
US19970948789 |
申请日期 |
1997.10.10 |
申请人 |
KEITHLEY INSTRUMENTS, INC. |
发明人 |
FASNACHT, GLENN;GOEKE, WAYNE |
分类号 |
G01R27/20;G01R31/04;(IPC1-7):G01R31/08 |
主分类号 |
G01R27/20 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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