Agilent Rf Signal Generator

#37 - A look inside of an Agilent E4400B signal generator

Agilent Rf Signal Generator

Another lucky find from eBay. This Agilent E4400B generator has some problem with fractional PLL. It seems to be unstable, so the instrument periodically shows error 508 "Frac-N Loop Unlocked". The synthesizer was inspected, the block diagram was discussed and the blocks were located on the board...

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