Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 79
Self Test
Self Test Descriptions
409 ALC Detector Offset (Model N5166B, N5171B, N5172B, N5181B,
N5182B)
This test checks that the ALC Detector Offset DAC can properly adjust the ALC
logger circuitry. This test is performed in open-loop mode. The RF is minimized
by setting the ALC Mod DACs appropriately. Then the ALC Detector Offset DAC
is set to both minimum and maximum while the LOG Det node is measured.
The delta is reported back.
410 ALC Bulk R (Model N5166B, N5171B, N5172B, N5181B, N5182B)
This test checks that the ALC Bulk R DAC can properly adjust the ALC logger
circuitry. This test is performed in open-loop mode. The RF is set high by
adjusting the ALC Mod Offset DAC until the ALC detector voltage is -1.0V.
411 ALC Integrator (Model N5166B, N5171B, N5172B, N5181B,
N5182B)
This test checks that the ALC integrator circuitry is working properly. For this
test the ALC loop is closed.
412 ALC Unlevel Detector (Model N5166B, N5171B, N5172B, N5181B,
N5182B)
This test checks that the ALC unlevel detector circuitry is working properly. The
ALC unlevel detector circuitry uses a window comparator to detect the
integrator voltage. This test is performed in openloop mode.
413 ALC Power Limit (Model N5166B, N5171B, N5172B, N5181B,
N5182B)
This test checks that the ALC power clamp circuitry is working and that the
power limit DAC can clamp the power as expected. The ALC loop is opened in
this test.
500 Modulation Self Tests
The Modulation Self Tests are designed to test the different modulation
circuitry available for the A3 RF assembly. These include AM, FM, PM, pulse, LF
output, and the external modulation inputs.
501 AM DAC (Option UNT)
This test checks that the AM DAC is working. Note that the AM DAC supplies
the analog AM signal as well as the op-amp band signal. The test sets the AM
DAC to output various DC levels and measures the resultant voltage.
502 AM To ALC (Option UNT)
This test checks that the AM Path to the ALC section is working properly.
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