U3020AS62
Service Information
Theory of Operation
This section provides a general description of the U3020AS62 Test Set, followed by a more
detailed operating theory. The operation of each component group is briefly described to the
assembly level only.
If you need to disassemble the instrument, be sure to work at an anti-static
workstation and use a grounded wrist strap to prevent damage from electrostatic
discharge (ESD). See
"Electrostatic Discharge Protection" on page 24
Test Set System Operation
Figure 10
illustrates the components and interconnects of the Test Set. The main function of this
Test Set is Dual Channel Signal Distribution. The Test Set consists of six main components: a
controller module, a 39495EXT module, distribution board for RF switches, two SP6T RF
switches and a front panel LED indicator. There are no adjustments required for the Keysight
U3020AS62 Test Set.
Figure 10
Test Set Block Diagram
I/O
Dist. Bd
GPIB
Controller Module
and
Power Supply
Cntrl
Bus
I/O
SW A
AC IN
LAN
34945EXT
Switch / Atten
Driver
Distribution Bd
Y1151A
SW
A
L4490A
P101
P102
SW
B
Bank 1
SW B
A
B
1
2
3
4
5
6
-- Input Ports
Channel B
1
2
3
4
5
6
Input Ports --
Channel A
Front Panel
ATTN
LAN
PWR
---OUT---
Channel
Stdby
Port LEDs
(Frt Pnl)
J1
J2
C
C
Keysight U3020AS62 User's and Service Guide
25
