I know from personal experience that, at least a few years ago, both Agilent in Loveland, CO, and Narda in Happauge, NY, had equipment to make PIM measurements.
Agilent used equipment designed and manufactured by Summitek in Colorado (http://www.summitekinstruments.com/
) had a custom in-house setup.
I do not have names for contacting either company, but you could just try calling the main phone numbers and ask. You might also try contacting Summitek to see if they can either do the testing or recommend a test facility.
- Kirt Blattenberger
RF Cafe Progenitor & Webmaster