Dc Continuity Test The Lfe Board And Test Ports (Available With Low Frequency Extension (Lfe) Installed Option 205/220/405/420/425) - Keysight Technologies N5244/5B Service Manual

Tests and Adjustments
Performance Tests
DC Continuity Test the LFE Board and Test Ports (Available With Low
Frequency Extension (LFE) Installed Option 205/220/405/420/425)
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
rear panel.
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 available all of the LFE Options listed.
3-50
<
>
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.
10Ω.
"Top Assemblies and
Chapter 6
Keysight N5244B/45B Service Guide
1
in the "Bottom