254 Keysight Technologies N9040B UXA Signal Analyzer Service Guide
Hardware Options
Option H1G, 1 GHz Analysis Bandwidth Assembly
7. If you do not change the -20 dBm amplitude of the signal source, but you
change the frequency of the source, and the center frequency of the UXA;
the rear panel IF 2 Out amplitude will change erratically due to the fact
this is not a calibrated output.
Here is the performance of one instrument:
Input Frequency Rear Panel IF2
Output Amplitude
If you turn off IF2 Out, expect this signal level on the UXA
screen:
1 GHz −20.2 dBm −20.5 dBm
5 GHz −2.9 dBm −20.9 dBm
10 GHz −5.00 dBm −21.3 dBm
20 GHz −7.0 dBm −22.0 dBm
30 GHz −8.4 dBm −22.6 dBm
40 GHz −8.7 dBm −23.0 dBm
50 GHz −15.0 dBm −24.0 dBm
At stop frequencies less than 3.6 GHz, the analyzer is in Low Band path, and the there is a 1 GHz
bandpass filter and switches connected to a metal plate on the Front End Assembly. See the
block diagram for 50 GHz UXA with Option B5X, and notice SW4, the BPF, and SW5.
If the measurement at input frequency 1 GHz is incorrect, but the 5 GHz (or greater) input
frequency measurement is correct, suspect a fault with the switches or band pass filter.
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