Agilent Technologies 85330A Receiver System, Remote, Return Loss, Run-Time Control Mode

Glossary

Receiver System

All of the instruments in the system that act as the RF downconverter and IF receiver.

Remote 1

The mode a 85330 operates in when it is being controlled by another 85330A in the Controller mode. Refer to “RUNTime: CONTroller” command and Chapter 6, “Programming” for more information.

Remote 2

The mode a 85330 operates in when it is being controlled by another 85330A in the Controller mode. Refer to “RUNTime:CONTroller” command on page 7-8and Chapter 6, “Programming” for more information.

Return Loss

Reflection measurements determine how much RF energy bounces off of a cable connector or the input of a device. This reflected energy is measured in “return loss” units. Reflected energy travels back toward the RF source.

For example. If you send a 0 dBm signal into a cable with 14 dB of return loss, a lower-level signal (−14 dBm) will reflect off the input of the cable and travel back toward the source. A low return loss value is bad because it shows that too much power is being reflected back out of the system. This indicates a bad connection somewhere in the system.

Run-Time

Refer to “Run-Time Control Mode.”

Run-Time Control Mode

This is an automatic mode where the 85330A can be pre-programmed to run a measurement. Using GPIB commands, the 85330A must set up prior to run-time. Then, an GPIB command is issued to pass run-time control to the 85330A. Refer to Chapter 6, “Programming” for details.

SCU

Refer to “Switch Control Unit” on page A-5.

SCU Address

Each Switch Control Unit can be assigned a unique address called an SCU address. When commands are sent to the SCUs, they only affect SCUs with the specified SCU address. SCU addresses are set using DIP switches inside the SCU, and can be set to 0, 1, 2, or 3. The factory default setting is 0. If you daisy-chain several SCUs together, they may use the same SCU address.

A-4 85330A Multiple Channel Controller