Re: HP 8664A signal generator repairability
|
For a decent power meter you do NOT want a Bird.? They are pretty sloppy.
I use my HP410B for example.? I calibrate it with my HP 3456A in the audio range and then it's good up to at least 500 MHz.? My HP 8657B isn't all that accurate and I have to use the Offset to get more accurate readings.? The spectrum analyzers are, as you say, not too accurate.
On the other hand, I don't need precision amplitude.? All I do is calibrate S meters and you can barely see 1 dB on them, and most aren't too accurate over the range.? So as long as I have 50 microvolts I am happy.? Flatness is another issue but then the SA does a good job.
Bob
On Wed, Mar 20, 2019 at 03:03 PM, alwyn.seeds1 wrote:
Dear All,
?
Measuring signal generator output accuracy with a spectrum analyser, even as nice a one as the 8566B, does not make a lot of sense since the amplitude accuracy is limited. The 8566B flatness is +/- 2.2 dB to which has to be added the calibrator accuracy of +/- 0.3 dB. A good signal generator has much better accuracy.?
?
What you need for the job is a decent RF power meter, which will give you a total measurement uncertainty of about +/- 0.4 dB.
?
Regards,
?
Alwyn ?
Hi, I am looking into getting one. The purpose of the above exercise is simply to make sure there are no gross problems with the 8664. Of that I am quite sure now, so I am keeping the instrument and getting a bit of a refund from the seller. Sean
|
