I have been working on an automated step calibrator project in recent months, so I was excited when I saw the device shown above on eBay. The descriptions calls it the NF-1000 SZ, but you won't find that model number anywhere on the device. The NF-1000 SZ contains a broadband radio frequency noise generator in conjunction with a 31.5 dB step attenuator. The rated output is -10 dBm to -40 dBm however my units maximum output was only -47 dBm! Obviously, this is way out of spec! I could just send it back, but I just had to look inside to see if there might be some simple problem.
|Noise generator block diagram.|
|Shielded rf sections in the RF-1000.|