U3020AD01
Controller Module
Inside the controller module there are two main components, the AC-DC power supply and
controller board. The AC-DC power supply is a 12V/65W power supply that is converted to
various voltages by means of DC-DC converter inside the module. It provides regulated
voltages to all assemblies in the Test Set as well as following voltages to drive programmable
step attenuator in the Test Set. The internal DC voltage has the following specification:
•
+24V/0.6A
•
+12V/3A fuse
•
+5V/1A
The controller board is the “brain” of the Test Set, it handles all the communication between the
Controller and the Test Set via LAN or GPIB connectivity. Refer to
39495EXT Module
This module drives the programmable step attenuators. The attenuators are connected to the
Test Set through the distribution board (Y1153A), which is installed on the 34945EXT module.
The 34945EXT is divided into four banks, organized by channel number.
We only use Bank 4
.
Distribution Board
(PCB3)
The distribution board
(Y1153A)
provides an interface between the 34945EXT
switch/attenuator
driver m
odule and the programmable step attenuator.
LED Indicator Board
(PCB2)
This board provides an LED indication of the
step
attenuator
value
setting in the Test Set. The
LED indicator board is driven by the digital
port of the controller module
.
Service Information
19
Keysight U3020AD01 User's and Service Guide
