Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 83
Self Test
Self Test Descriptions
902 Quadrature DAC
This test checks the quadrature loop circuitry on the A2 Baseband Generator
assembly.
903 IQ Modulation
This test checks the ability of the IQ modulator to modulate a signal on the RF
path. For this test, all signals are passed through the 6 GHz low pass filter path
to keep the path consistently independent of RF frequency.
While this test tries to check the power on the A2 Baseband Generator
assembly, faults on the A3 RF assembly may influence the results. The primary
reason for this is that the output of the A2 Baseband Generator assembly is
expecting a 50 ohm load. When this is not the case (due to faults), then the RF
signal will reflect back into the A2 Baseband Generator assembly causing
unpredictable results.
904 BB Board Frequency Band
This test checks the RF power through the different filters on the A2 Baseband
Generator assembly. The power is detected right before the RF signal leaves
the assembly.
While this test tries to check the power on the A2 Baseband Generator
assembly, faults on the A3 RF assembly may influence the results. The primary
reason for this is that the output of the A2 Baseband Generator assembly is
expecting a 50 ohm load. When this is not the case (due to faults), then the RF
signal will reflect back into the A2 Baseband Generator assembly causing
unpredictable results.
905 RF To Main Board
This test checks to ensure that the RF power from the A2 Baseband Generator
assembly makes it to the A3 RF assembly. The power is detected using the ALC
detector.
1100 MW ALC Self Tests (Model N5173B, N5183B)
The MW ALC Self Tests are designed to test the functionality of the A7A1
Microwave ALC assembly.
1101 MW ALC Voltages
This test checks the power supply voltages used by the A7A1 Microwave ALC
assembly.
1102 MW ALC FPGA
This test checks the ability to communicate properly with the FPGA on the
A7A1 Microwave ALC assembly.
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