Agilent Technologies service manual Fast Data Acquisition Modes, 85330A System

Glossary

Fast Data Acquisition Modes

Fast Data Acquisition modes (also called “Fast CW” modes) refer to a set of similar 8530A measurement modes where:

•All data processing except averaging is suspended to provide fastest possible measurement speed.

•All data is stored in a 100,000 point FIFO data buffer, which can be read by a computer controller.

As mentioned above, these modes are also referred to as the “Fast CW” modes. The term “Fast CW” is somewhat misleading, however, because with the proper equipment configuration, these modes can be used in multiple-frequency applications.

There are several versions of the Fast Data Acquisition feature; but for PIN switch applications, the recommended mode is the “Autoranged Data Collection” mode (FASAD). This mode accepts sudden changes in input power by autoranging. The changes in power can span the entire dynamic range of the receiver. Refer to the Automated Measurements chapter in the Agilent 8530A User’s Guide for a full description of this mode, including an BASIC programming example.

Fast Source Control

Fast source control speeds up frequency switching speed in multiple-frequency measurements. It is only available in systems that use two sources. This mode uses TTL signals to increment RF and LO source frequency, providing faster frequency switching speeds than are possible under 8530A control. In the fast source control configuration, the system’s computer must set up the sources with appropriate frequency settings, triggering mode, and so on. When automatic run-time measurement mode is engaged, the 85330A automatically increments the RF and LO source frequencies using TTL lines. More information is provided in Chapter 6, “Programming.” When being controlled by a computer, the SCPI language mode must be selected. This is shown in Figure 1-3 on page 1-5.

85330A System

This term describes the following products, used together in a functional switch control system:

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85330A multiple channel controller

One or more 85331A or 85332A pin switches (with supplied SCUs)

Attaching cables

A-2 85330A Multiple Channel Controller