HP 84125C, User Manual

Page: 46 / 101

4
T est Set Hardware Congurations
This chapter describes how to set up and congure your test set with
the appropriate antenna and lters needed to make measurements
over the entire frequency range of the HP 84125C system. When
making measurements from 1 to 18 GHz, a high-pass lter can be
installed. If testing an intentional radiator product, this helps to
avoid an RF overload condition by ltering out the fundamental
frequency . There are three lters supplied with the system: 1.5 GHz,
3.5 GHz, and 8.25 GHz. These lters provide 60 dB of rejection at the
fundamental frequency . Measurement of harmonics above 18 GHz do
not require the use of a high-pass lter; the 18 to 26.5 GHz and 26.5
to 40 GHz waveguide horn antennas serve as high-pass lters .
Figure 4-1 shows the possible antenna and lter congurations
available .
Figure 4-1. T est Set Diagram
1 to 18 GHz Conguration
Note
If an antenna is already installed, you may need to remove the
antenna and any associated cables or lters before installing
another antenna.
When performing the following antenna installation, only nger
tighten connectors keeping all connections loose until the last step .
T o ensure good cable connections , refer to \Cable and Connector
Care " found later in this chapter .
T est Set Hardware Congurations 4-1