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4
Introduction to Programming
Agilent 8490x Series / 849x Series Attenuators and 876xM Series Switches
The Agilent 8490x series and 849x series attenuators, and the 876xM series
switches are supported on the following distribution board:
• Y1153A
The bank diagram shown in Figure 4-13 represents attenuators that have four
sections of attenuation. See Figures 2-7 and 2-8 for attenuation guides. In this
example, the 34945A is in 34980A slot 1.
Presetting the Bank
In order to preset any of the banks on the 34945EXT module (the programming
of any switch or attenuator must begin with the preset state), '
(Figure 4-2) must be selected and the module's channel drive must be off (Con-
figure Module... button).
To set the preset values for the 8490x series / 849x series attenuators and
876xM series switches (Figure 4-13), select '
Configuration window. All attenuators supported on this distribution board
have the same preset settings. Presetting the bank is equivalent to sending the
SCPI commands shown, or to configuring the attenuators to the settings
indicated in the bank, module, and channel configuration windows.
Changing Settings and Enabling the Channel Drive
Following the preset, use the bank configuration and channel configuration
windows (Figure 4-13) to change the preset settings as required. The SCPI
Command Interface window can also be used to send commands to the
instrument.
When complete, use the module configuration window to enable the channel
drive. (If using more than one 34945EXT, the channel drive source must be set
to EXTernal for all 34945EXT modules other than the master.) Use the bank
diagram to control the levels of attenuation (see "Y1153A Switch Control" in
Chapter 5 for more information).
Settings (commands) from any of these sources can be logged for transfer
to other programming environments (see "Logging SCPI Commands").
78
- 8490x series
(two attenuators - if no switch connected)
- 849x series
(two attenuators - if no switch connected)
- 876xM series
(two switches - if no attenuator connected
Agilent 34945A Microwave Switch/Attenuator Driver Module User's Guide
- one 8769M)
' in the Bank
Preset Bank
Allow Full Control
'
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