132 Keysight N9038A MXE Service Guide
Input Selection & Level Control
Input Selection & Level Control Section Purpose
Input Selection & Level Control Section Purpose
Input Selection & Level Control Section Purpose
The assemblies covered in this section are responsible for the routing of the
signal being measured by the instrument, whether it is from one of the two
front panel inputs or one of the internal calibration signals, to the RF
Downconverter section of the instrument. There are also two input attenuators
that are used to optimize the signal level applied to the downconverter section.
This section also contains a limiter assembly that will protect the Front End of
the instrument from transient signals that are often present when performing
conducted emissions testing.
Input Selection & Level Control Section Description
The components discussed in this chapter are:
— A9 Input Attenuator A
— A10 Input Attenuator B
— A23 Limiter Assembly
—SW1 Cal Switch
—SW2 Transfer Switch
Refer to Chapter 15, “Block Diagrams.”.
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