Re: Agilent 346A and N9069A reading high?
Hi Conradtoggle quoted messageShow quoted text
I have also seen abnormally high NF readings on an example of the HA8ET preamp. This preamp includes narrow band filtering, and it could be that the noise bandwidth of the preamp is narrower than the Agilent test set bandwidth. I recollect that you might be able to configure the Agilent box for a narrower measurement bandwidth, but I don't have the manual to check. The 8970A will suffer from the same problem and is not configurable, the only way to test such preamps with the 8970 series boxes is to build a low loss narrow band 144MHz filter, then calibrate the instrument with the filter in circuit and then test the preamp via the filter (bear in mind that the filter won't look like a flat 50 ohm source so there will be errors due to changes in the impedance seen by the preamp input unless you include an isolator after the filter).
On 18/07/2013 13:44, Conrad Farlow wrote:
I have access to an Agilent 346A head with an N9069A noise figure