I always wanted a HP 8970B noise figure meter to measure the noise figure of some amplifiers etc. However, these usually go for stiff prices, but recently I found an unit on eBay which was quite cheap.
My HP 8753C network analyser has options 010 and 006 installed, with 006 being the 6 GHz operation and 010 being time domain analysis. However, there is also option 002, which is called harmonic analysis.
UPDATE: I made a firmware dump & updated to the latest version!
I got a ‘new’ spectrum analyzer, which is a HP 8568B (100 Hz – 1.5 GHz). Unfortunately, it has some problems with the CRT, as well as some noisy traces.
With the lab power supply, the YTO worked fine, so I did some further investigations on the 8341A’s YO loop…
UPDATE: power flatness test!
Today, I decided to dismantle the YO loop of my HP 8341A to further search for the problem.
So, the HP 8341A which I recently got has several problems. Besides a bad YTO, it also has a burnt relay on the A62 motherboard. When fixing the generator, I decided to start with the easy things….
My employer wanted to throw away a HP 8341A signal generator. This is a 10 MHz to 20 GHz sweep generator! Of course I rescued that unit from trash….
I recently decided to calibrate my HP 4195A network/spectrum analyser. While I had the device open, I also dumped the firmware (28 EPROMS!)
At a former employer, they threw away a HP 4195A network analyser. The reason was because it had some problems with its internal source. I kept the unit for a few years and always was afraid of opening it and repairing it because I thought the potential to further damage it was too high. But now I tried to repair it and it worked 🙂
A few years ago, I bought a HP 8753C network analyser. The cool thing is: it has options 06 (6 GHz operation) and 02 (time domain). Unfortunately, recently it showed an annoying error message.