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Where can I find manuals for discontinued and obsolete Hewlett-Packard, Keysight and Keysight test equipment?
Most Keysight products have PDF manuals that can be found on product pages. Other vendors also supply old manuals.

FAQ 2014-08-01

On the Keysight NFA Series of Noise Figure Analyzers, is it possible to query the RF attenuator range while in the auto range mode?
The command to query the Keysight NFA RF attenuator while in the auto ranging mode is: DIAG:BLU:RF:RANG?

FAQ 2014-01-31

Is there a sample program for acquiring Noise Figure and Gain Data from the NFA Series of Noise Figure Analyzers?
Yes

FAQ 2014-01-31

What is the absolute output power level of the various Keysight noise sources?

FAQ 2012-11-06

Can the 346C-K01 be used below 1 GHz?
This special option is not calibrated or characterized below 1 GHz.

FAQ 2009-04-28

Is there a method to improve measurement data correlation between the 8970B and the N897xA Series Noise Figure Analyzers (NFA)?

FAQ 2009-02-04

How do I perform a User Calibration when utilizing a Keysight R347B or Q347B Noise Source with the N8975A Noise Figure Analyzer?
User calibration requires a second noise source as the operating frequency range for the R347B and Q347B is above the maximum input frequency for the N8975A...

FAQ 2009-02-04