78 Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
Self Test
Self Test Descriptions
400 Output Self Tests
The Output Self Tests are designed to test the output RF section as well as the
ALC section of the A3 RF assembly.
401 Output Voltages
This test checks some supply voltages as well as bias voltages on the FET
amplifiers within the output section to ensure that they are properly biased.
402 ALC Detector Heater Voltage
This test checks the detector heater voltage to make sure that the heater is
operating properly.
403 ALC Temperature Compensation (Model N5166B, N5171B,
N5172B, N5181B, N5182B)
This test checks the ALC temperature compensation circuit to ensure that this
circuit is working properly.
404 ALC Reference (Model N5166B, N5171B, N5172B, N5181B,
N5182B)
This test checks the ALC reference DAC and circuitry.
405 ALC Mod Drive
This test checks the ability of the ALC Reference DAC and the ALC Mod Offset
DAC to control the Mod Drive reference voltage. During the test, the ALC is set
to open-loop mode and the power limit is effectively turned off.
406 ALC Mod Current
This test checks the ALC mod drive exponentiator and the mod current driver
circuitries which drive the ALC modulators on the RF path. The test runs in
open-loop mode so that the integrator does not contribute to this test. In
addition, the RF is turned off during this test using the pulse modulator so that
the RF signal is not large through the RF chain while this test is running.
407 ALC Detector
This test checks the ALC Detector as well as the RF power through the three
main signal paths. This test is performed in open-loop mode so that the ALC
does not try to correct (and corrupt) the measurements.
408 ALC Logger (Model N5166B, N5171B, N5172B, N5181B, N5182B)
This test checks the ALC logger circuitry. This test is performed in open-loop
mode. During this test, the RF power is adjusted to achieve a certain detected
voltage to get a known voltage into the logger circuit.
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