Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide 85
Self Test
Self Test Descriptions
otherwise cause offset errors. The Bulk R errors are most evident at high ALC
detector levels. Therefore, the RF power is set high for an ALC Detector voltage
of -1.5V by adjusting the ALC MOD Offset DAC.
1110 MW ALC Log BreakPoint
This test checks that the ALC Log Break Point DAC can properly adjust the ALC
logger circuitry, and ultimately, the RF power. This test is performed in
open-loop mode. The ALC Log Break Ponit DAC sets the point at which the
linear region moves into the square law region.
1111 MW ALC FET Drive
This test checks the ALC Integrator Hold FET Drive circuitry. This test is
performed in open-loop mode.
1112 MW ALC Integrator
This test checks that the ALC Integrator circuitry is working properly. This test
is performed with the ALC loop closed.
1113 MW ALC Unlevel Detector
This test checks that the ALC Unlevel detector circuitry is working properly. The
ALC Unlevel detector circuitry uses a window comparator to detect when the
integrator voltage is railed. This test is performed in ALC closed-loop mode
sine the microwave ALC integrator output cannot be zeroed in open-loop
mode.
1200 MW Multiplier Self Tests (Model N5173B, N5183B)
The MW Multiplier Self Tests are designed to test the operation of the A7A2 20
GHz Frequency Multiplier assembly. The main focus for these tests is to verify
that attenuators are functioning as expected, filters are functioning properly
and consistent across the frequencies of interest, and the Gain DAC is
controllable and functioning properly.
1201 MW Multiplier First Attenuator
This test checks the performance of the multiplier first attenuator by
referencing key attenuation states against the 0dB (thru) setting. The input
detector is switched in to measure the 0 dB state. This measured voltage is
then used as a reference for switching in and measuring subsequent
attenuations states. Once the six states are measured, two additional delta
attenuation states are measured to assure overall operation.
1202 MW Multiplier First RF Paths
This test verifies the operation of each bandpass filter located in the first
section of the A7A2 20GHz Frequency Multiplier. A reference voltage is
established, and filter edges are checked. The difference between the voltages
are corrected for temperature and then reported for each test point.
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