Instrument Interface Section; Rear Panel Bnc Input / Output Section - Keysight Technologies X Series Service Manual

RF Assembly
A3 RF Assembly Troubleshooting
Sweep Out Interface
See the
Section"

Instrument Interface Section

For problems with the instrument communication, see the
Issues"

Rear Panel BNC Input / Output Section

There are multiple rear panel BNC connectors on the A3 RF assembly. Some of
these rear panel connectors can be configured to perform many different tasks,
some both inputs and outputs, and some for optional functionality. The
procedures for verifying the functionality of these ports will use the most basic
functionalities that can be used without the existence of optional features if
possible. To verify the functionality of these connectors, follow the procedures
below.
EXT 1 and EXT 2
This procedure is only applicable with option UNT, AM, FM, Phase Modulation.
This procedure will verify that each of the two external modulation inputs are
functioning properly. It will use the two external modulation inputs to
amplitude modulate the instrument output. It assumes that the internal
amplitude modulation is working properly. If there is a problem with amplitude
modulation when the modulating source is internal, resolve that issue before
proceeding with this procedure.
This procedure will require the use of a function generator and a spectrum
analyzer.
1. Return the instrument to a known state by pressing Preset.
2. Turn both the output power and modulation on by pressing RF On/Off and
3. Connect the source RF output to the input of a spectrum analyzer.
4. Setup the spectrum analyzer with the following settings:
5. Tune the instrument to 1 GHz by pressing FREQ, 1 GHz.
Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
"SWEEP OUT" section of the Rear
later in this chapter.
section in Chapter 6, "Troubleshooting"
Mod On/Off so that the LEDs below them come on.
— Center frequency = 1 GHz
— Span = 0 Hz
— Resolution Bandwidth = 3 MHz
— Scale Type = Linear
— Reference level = 300 mV
— Sweep Time = 5 ms
"Rear Panel BNC Input / Output
"Communication
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