Checking The Signal Separation Group - Keysight N5224B Series Service Manual

Troubleshooting
Measurement System Troubleshooting
Checking the A70/A75 Low Frequency Extension (LFE) Board and the Bias
Combiners
The 2-port and 4-port Low Frequency Extension (LFE) options add additional
hardware to extend the start frequency of the VNA down to 900 Hz.
Figure 4-13 LFE Block Diagram - Single Port Configuration Shown. Other Ports are
Similar.

Checking the Signal Separation Group

Before checking the signal separation group assemblies, you must open the
analyzer.
Use an antistatic work surface and wrist strap to reduce the chance of
electrostatic discharge for all of the procedures in this chapter.
1. Turn off the analyzer power.
2. Unplug the power to the analyzer and disconnect all front and rear panel
Keysight N5224B/25B Service Guide
connections except installed jumpers.
4-47