发明名称 |
Improvements in or relating to frequency response analysis. |
摘要 |
<p>In a frequency response analyser capable of testing a system under test at a higher frequency F derived from a signal generator providing a relatively higher frequency F/K. A reference signal of frequency F-C is supplied to a mixer where it is multiplied with the return signal of frequency F to provide a fixed frequency output C. An analysing portion of the frequency response analyser is therefore required to operate only at this fixed frequency C and may provide an output in any suitable form, for example displays of magnitude and phase against frequency as F/K is varied. The present invention overcomes the problem of providing a VCO based signal generator capable of operation at very low frequencies.</p> |
申请公布号 |
EP0340021(A2) |
申请公布日期 |
1989.11.02 |
申请号 |
EP19890304271 |
申请日期 |
1989.04.28 |
申请人 |
SCHLUMBERGER TECHNOLOGIES LIMITED |
发明人 |
SAYERS, B;RYDER, ALAN;OUTRAM, STEVE |
分类号 |
G01R23/16 |
主分类号 |
G01R23/16 |
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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