Dc Continuity Test The Lfe Board And Test Ports (Available With Lfe Option 205/220/420/425) - Keysight N5224B Series Service Manual

2-port and 4-port pna microwave network analyzers 900 hz/10 mhz - 43.5/50 ghz

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Tests and Adjustments

Performance Tests

DC Continuity Test the LFE Board and Test Ports (Available with LFE

Option 205/220/420/425)

The DC continuity test verifies that the LFE board is installed correctly and

does not have any opens or shorts in the DC path.

1. Using a DVM, connect one test probe to the center conductor of the RF

port 1 on the front panel.

2. Connect the other test probe to the port 1 bias input (BIAS 1 IN) on the

3. Verify the DVM measures

4. Repeat these steps for each of the other test ports.

If the DVM value is 0Ω or

there is an open or short somewhere in the LFE board/cable path:

1. Your model PNA may not have all of the LFE Options listed.

Keysight N5224B/25B Service Guide

10Ω, then something is incorrectly installed or

Verify the gray DC bias cables installed in

Cables, All Options, Serial Number Prefixes <6021" on page 6-19

and the blue RF flexible cables installed in

Assemblies" section—for your LFE option—are connected correctly

and not open or shorted.

"Top Assemblies and

in the "Bottom

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Troubleshooting

N5225b series