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PNA Sliding load position reversal?

Question asked by tagmantazy on Aug 20, 2014
Latest reply on Sep 23, 2014 by Dr_joel
We received two new Agilent N5245A PNAs to replace our old 8510SX system, during the calibration of the PNA using an 85054B N-Type calibration kit it was immediately noticed that the calibration using the sliding load is reversed. The PNA indicates position 1 of at least 5 that the slide is shown in its fully out position (towards the pullback end), completely opposite to the manual for the 85054B which shows position 1 fully towards the connector end. The PNA then goes on to move the slide towards the connector end again completely opposite to the manual for the 85054B.

With the PNAs we received several 85056A 2.4mm calibration kits and a 85057B 2.4mm verification kit, so to check to see if this is a common problem with the PNAs I carried out a calibration of the PNA with the 85056A 2.4mm calibration kit. In accordance with the Agilent User’s Manual Page 3-18, Quote:-

“NOTE     After calibration has begun, always move the sliding ring towards the center conductor pullback end of the sliding load. If the sliding ring is moved toward the connector end of the load during the calibration sequence, the calibration may be unstable and poor measurements may result.”

Again the PNA indicates position 1 of at least 5 that the slide is shown in its fully out position, in direct contradiction with the manual.
Please could you confirm which is correct, the literature or the PNA?  

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