Keysight N5227B Service Guide 3-43
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
rear panel.
3.
Verify the DVM measures
<
10
Ω
.
4.
Repeat these steps for each of the other test ports.
If the DVM value is 0
Ω
or
>
10
Ω
, then something is incorrectly installed or
there is an open or short somewhere in the LFE board/cable path:
—
Verify the gray DC bias cables installed in
Cables, All Options” on page 6-17
and the blue RF flexible cables
installed in
in the "Bottom Assemblies" section—for your
LFE option—are connected correctly and not open or shorted.
