[R-390] Suggested Test Equipment for R-390A Alignment ??

[Randy Zelick]

Hello all,

Speaking of generators, I have a very nice HP 8640B, the source that 
several folks have been praising. Indeed, I like mine very much and would 
agree that it is probably the best generator I have owned. 

One advantage of this design (a cavity resonator) is the high spectral
purity. It can be a plus when tuning selective filters. You can get high
output without a lot of spurs only 30 dB down that can lead to
misalignment.

But here is an issue with my unit: It leaks RF!!!

Has anyone else had this experience with an 8640?? I can't believe it is 
supposed to do this, yet I can find no fault with my specimen.

It is lot leaking out the attenuator, which is well calibrated down to 0.1 
microvolt. Rather it seems to be leaking out the case. Switching off the 
RF using the little slide switch next to the output connector does not 
affect the leakage. 

Thanks for any suggestions.

Cheers,

=Randy=

 -- 
R. Zelick				email: zelickr@pdx.edu
Department of Biology			voice: 503-725-3086
Portland State University		fax:   503-725-3888

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