Products > Test Equipment
Agilent E8357A
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Forzaman:
Yes, I plan on performing the alignment with the proper equipment, but only for the existing 6GHz configuration for now.  I'm not going to do the frequency upgrade until after the warranty expires. I can round up all equipment except for the 8482A sensor so far... still asking around.

Will let you know the power level during calibration.
joeqsmith:
That's fine and will tell me what I want to know.  Because mine created the files even without anything attached to the GPIB, I wonder if it goes though the adjustments first.   I'll try that again while monitoring one of the ports. 

Just an FYI, if it wasn't clear, you can backout that range change or any other option if that was your concern about the warranty.   I was thinking changing the hard drive and battery would be more intrusive as you have to open it up where the range option is just software. 

Mine came with a return grace period.  Maybe a few months.  More than enough time to check it.  I hoped to ship it off to Caesar before they left KeySight.  They posted about having some of the CPU boards in stock and I knew that sending it in would solve the alignment and uncover any other potential problems.    Mine had been worked on before by some monkey in a cage which increased the risk.  By the time I was running down the clock on that grace period, I had used the PNA enough to be hooked.   No more 70's thumb wheel switches.   :-DD
 
Forzaman:
Thanks for the info Joe. I didn't realize you could revert back to the original HostID and frequency range after the upgrade. PA0PBZ provided me with the key for the time domain which I installed and is working well.  :-+ If I need to send it back, I can reinstall the original HDD. I doubt they will realize the battery has been changed. Even if they do, I don't think they would have expected me to ship the unit back just for that. There were no cal or warranty stickers on the case, so they shouldn't be able to tell if I opened-up the unit.


joeqsmith:
At least with mine, I am able to just copy the original license back into the PNA and it's resorted.   

I've been playing a bit more with the receiver alignment and reading what I am able to find.  Looking at the service guide for the N5221A, they use the power meter to measure the cable loss.  They don't mention measuring the power from port 2.  What's interesting about this is the data you both supplied, the second file has a slight loss.   

I had tried to run the alignment without the power meter and monitoring the signal from PORT1.  It seems to suggest that the run it at 0dB.   They do call the mxcal files, mixer calibration.   It would make some sense if they are using R1 as part of this measurement, we would see the 6dBish loss.

I wrote simple program to parse the ASCII characters from the alignment software.   I further filtered the data by showing only characters with adjacent ASCII characters (see attached).   

--- Quote ---Attach one end of  cable to Port Then attach )IJ(Rx sensor to other end of the cable. Use adapter if necessary.Please wait...measuring cable loss valuesAttach the  sensor to the end of the cable
--- End quote ---


*************
Receiver Adjustment
The receiver calibration is used to adjust the network analyzer receivers for a flat response across its full frequency range:
1. A power meter/sensor is connected to Port 1, as shown in Figure 3-16, to establish a reference for flatness.
2. A cable is inserted between the power sensor and the test port, as shown in Figure 3-17, to establish a reference for the cable.
3. The same cable is connected between test port 1 and test port 2, as shown in Figure 3-18, and a signal from Port 1 is used to adjust the “B” receiver at Port 2.

The adjustment is repeated using a signal from Port 2 to adjust the “A” receiver at Port 1.

Data obtained during this adjustment are stored in the mxcalfile_pxx files inflash memory on the test set motherboard, with a backup copy stored on the hard disk drive. The data are used in subsequent measurements.
********
joeqsmith:
Again, pure guess work...

Measured power directly at port1 and also R1.  Insert test cable on port1 and measure power at end of cable along with R1.   Subtract R1 and zero the phase.  This seems to get us very close on the two lower graphs for NOCAL.PNG.    Attach cable to port2 (thru).  Measure S21,12.    Compensate the mag only with new levels.

S21/12 with the cable used to align it is now very good.  S11/22 also seems decent but procedure could be totally wrong. 

Next step is to try a patent search.   
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