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6-8 85330A Multiple Channel Controller
Programming
Fast Source Control
Fast Source Control
Description Fast source control speeds up frequency switching speed in
multiple-frequency measurements. It is only available in 85309A-based
systems. This mode uses TTL signals to increment RF and LO source
frequency, providing faster frequency switching speeds than are possible
under 8530A control.
Refer to the programming “Example 3” on page 6-29.
To Use this
Configuration
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. When being controlled by a computer, the SCPI language mode must
be selected. This is shown in Figure 1-3 on page 1-5.
Fast Data Acquisition can be used in this configuration. Use the 8530A Fast
Autoranging Data Mode (GPIB command:
FASAD), as explained in Chapter 8
of the Agilent 8530A User’s Guide.
8530A settings
In the 8530A Local menu, the addresses for Source 1 and Source 2 must be
set to 31. This tells the 8530A that it cannot communicate with the sources.
85330A settings
Since the 8530A does not control the sources, set the multiple channel
controller to TTL triggering mode:
RUNT:SOUR:SOURCE1:TRIG TTL;
RUNT:SOUR:SOURCE2:TRIG TTL;
Source settings
• Use Frequency List or Step mode.
• Sweep Point Trigger must be set to EXT:
SWE:TRIG:SOUR EXT;
• Start Sweep Trigger must be set to AUTO:
TRIG:SOUR IMM;
The Sweep Point Trigger and Start Sweep Trigger settings allow external
triggers from the 85330A to trigger the sources.