Keysight NFA Series Noise Figure Analyzers Service Guide 313
Power Supply/Midplane Troubleshooting
A7 Midplane Description
Power Supply Dithering
A triangle wave of approximately 100 Hz is generated and goes directly to the
A6 Power Supply assembly. This is used to frequency modulate the power
supply switching frequency for the purpose of lowering any power supply
related interference. If for some reason the level of the power supply related
interference is higher than normal this circuitry, or the A6 Power Supply
assembly, could be suspect.
Miscellaneous Circuitry
Other circuitry on the A7 Midplane include a circuit to phase lock the CPU
clock to the analyzer's 10 MHz reference and a Complex Programmable Logic
Device (CPLD) used as an Instrument Local Bus (ILB) buffer to A16 Reference
Assembly connector at J21.
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