Keysight Technologies L4490A, User Manual

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110 Keysight L4490A/L4491A User’s Guide
Introduction to Programming Switch and Attenuator Programming
Keysight 8490x Series / 849x Series Attenuators and 876xM Series
Switches
The Keysight 8490x series and 849x series attenuators, and the 876xM series
switches are supported on the following distribution board:
- Y1153A
- 8490x series (two attenuators - if no switch connected)
- 849x series (two attenuators - if no switch connected)
- 876xM series (two switches - if no attenuator connected
- one 8769M)
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.
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), ‘
Allow Full Control
’
(Figure 4-2) must be selected and the module’s channel drive must be off
(Configure Module... button).
To set the preset values for the 8490x series / 849x series attenuators and 876xM
series switches (Figure 4-13), select ‘
Preset Bank
’ in the Bank 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 L4491A Option 002 is installed, the channel drive source must be set to
EXTernal for the second 34945EXT - remote module 2.) 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”).