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85330A Multiple Channel Controller A-3
Glossary
Insertion Loss
A transmission measurement determines how much RF energy is lost as it
passes through the device under test (DUT). Energy loss is measured in units
called “insertion loss” and is measured in dB units. It is important to be
aware of transmission losses in the system so you will not attribute them to
the antenna or device under test.
For example: If you send 0 dBm down a cable with 10 dB of insertion loss,
−10 dBm will come out the other end.
LO/IF Unit
Name for the Agilent 85309A LO/IF Distribution Unit.
Operating Characteristic
The term “operating characteristic” refers to performance that is based on
design parameters, but is not actually measured.
Port
One of the two control ports on the back of the multiple channel controller
(PORT 1 and PORT 2). Each port provides independent control over one or
more SCU/switch module pairs. In standard systems, one of the following
configurations is used:
• Standard system with one SCU/switch module pair: The SCU can be
connected to either port 1 or port 2.
• Standard system with two SCU/switch module pairs: One SCU is
connected to port 1, and the other is connected to Port 2.
Ratio
The default type of measurement made with the 8530A is a ratioed
measurement. Ratioed measurements divide the test signal input by the
reference signal input. (For example, selecting b1/a1 would divide the test
signal at b1 by the reference signal at a1.) A ratioed measurement provides
common-mode rejection of errors caused by the transmitter or transmit
antenna.
Receive Switch
Any switch set up on the receiver-side of the range. This is the switch that
you have set up to select different antennas under test, or different polarity
outputs from the same antenna, and so on.
Receiver
The 8530A. The 8530A receives the IF signal, digitizes it and processes the
digital signals.