A while ago I managed to acquire a? HP 85047A, unfortunately it has had an accident sometime in it's life and Port1 is loose and slightly bent. I have measured the directivity of the port and it seems to be in the right ballpark as far as performance is concerned. However the whole sensor moves.
Obviously being bent is not correct, but slight movement is by design. There are some accessories that fit directly onto the test sets, which have fixed spacing on the plugs. To allow for mechanical tolerances, the port 1 connector on the 85047A moves a little.
Opening up? the unit I see that whereas port2 is direct metal to metal contact where the mounting screws are located, port1 has plastic washers between the two surfaces. No matter what I try I cannot stop it moving. Anyone have any ideas?
Well there is a way. You take out the washers, and take about 0.2 mm off the thinner surface, but as I say, they are designed to move.?
Next week I should get an HP8753E opt 011 unit and I will then be able to see if the Port1 sensor needs replacing or not.?
- Charles G4GUO
If you need calibration kits, contact me. You can buy our kits on eBay, but obviously it is cheaper if you don't. See link in my signature.
Dr. David Kirkby Ph.D CEng MIET Kirkby Microwave Ltd Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Essex, CM3 6DT, UK. Registered in England and Wales, company number 08914892.
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