Hey Yves,?
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Thanks once more for all your fast and helpful replies! Many (paid) customersupport isn't as helpfull as you are.
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There is no jumper on a14W1, option 130 is installed and the jumper was missing on the option module, to get it working I took the jumper from A14w1 and installed it on the opt 130 card.?
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I did quite some measurements with the instrument both in factory default cal and after it had done it's selfcal.?
Factory default cal:
I used the TinySa generator function to generate 300MHz @-71dBm
8591E set to 300MHz, 0Hz Span, Ref level 0dBm
Levels measured:
| Ref level |
Mrkr |
| -50 |
-65 |
| -40 |
-66,5 |
| -30 |
-68,2 |
| -20 |
-69,6 |
| -10 |
-70,7 |
| 0 |
-71,5 |
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There seems to be more than 50dB of range but I might misinterpret.?
I also did the 1dB steps, seemed to show 10 steps with the measured level changing about 1dB.?
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Next I connected the 8591E Cal signal directly to the input, span 0 Hz, freq 300MHz, measured level -22.5dBm. Connected TinySA to the Aux IF output which measured 21.4MHz, -49.8dBm. Quite a difference from your -38dBm.
I also connected the TinySA to the 2nd converter LO Out, measured 1.799GHz, -17.3dBm
And the 600MHz out: 600MHz, 0dBm.
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After selfcal:
Then I did a full Selfcal, did again notice strange behaviour during 3dB BW Cal, checked a vid online of a full selfcal, there the levels seem to be properly on the screen, during this 8591E selfcal it looks like this:
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After selfcal I redid the previous measurements
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| Ref level |
mrkr |
| -50 |
-55 |
| -40 |
-56 |
| -30 |
-57 |
| -20 |
-60 |
| -10 |
-70 |
| 0 |
-70 |
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There is a jump with the -20dB level as can be seen in the pictures too.
I also checked the IF out after cal
8591E Cal signal directly to the input, span 0 Hz, freq 300MHz, measured level -5dBm. Connected TinySA to the Aux IF output which measured 21.4MHz, -39.2dBm. A lot closer to your -38dBm. Is the too low IF output causing an overcompensation during calibration?
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Btw, i bought a nullmodem cable and a usb to serial adapter. I can now receive the plotter/printer output from the 8591E in serial terminal on my pc. I'll see if I can make a plot out of it with some of the online hpgl plot software.
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