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A-2 85330A Multiple Channel Controller
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:
• 85330A multiple channel controller
• One or more 85331A or 85332A pin switches (with supplied SCUs)
• Attaching cables