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Keysight U3042AM20 User’s and Service Guide
U3042AM20
Theory of Operation
-
Theory of Operation
The following is a description of the operation of the Test Set. Reference the
Test Set block diagrams shown in
. This section assumes
the user has a general understanding of couplers, switches, and network
analyzers.
The module is a set of switches controlling source and receiver paths of the
PNA port and five couplers in the column under the PNA port. There are four
modules, one for each of the PNA ports and Test Set ports.
RF Coupler/Bridges
The Test Set uses twenty coupler/bridges (5087-7716 or 5087-7752 RoHS) on
the front panel for RF Test Ports 5 - 24. The coupler/bridges provide the signal
separation of the source and receiver paths, using resistor networks. The Test
Set ports can receive from or stimulate a signal to the DUT.
The RF Test Port connectors are male 3.5 mm. The coupling factor is
approximately
−
16 dB for the Coupled Arm (minimum
−
22 dB and max
−
12 dB
at 26.5 GHz). The insertion loss through the CPLR THRU path is typically
< 4 dB at 26.5 GHz. Do not use excessive RF power or DC voltage, or damage
may occur to the internal resistors.
RF Switch Components
The Test Set uses eight mechanical switches that have internal 50
Ω
termination. The switches select the RF paths from the PNA-X source and
receiver through interconnect cables to the Test Set. PNA-X Ports 1 thru 4 and
Test Set Ports paths 5 thru 24. If your Test Set includes Option 129 an
additional switch has been installed to provide the Ext Noise Source path to
Port 1, 5, 9, 13, 17 or 21.
PNA-X Switch Paths
S10 - Source to Ports (1, 5, 9, 13, 17 and 21)
Switch 10 provides control of the Source Output path to PNA-X Port 1 and Test
Set Ports 5, 9, 13, 17 and 21. In the state shown in the block diagram, switch
10 routes the RF Source back to the PNA-X Port 1, and the Test Set Source
path to Port 5, 9, 13, 17 and 21 are terminated.
S20 - Source to Ports (3, 6, 10, 14, 18 and 22)
Switch 20 provides control of the Source Output path to PNA-X Port 3 and Test
Set Port 6, 10, 14, 18 and 22. In the state shown in the block diagram, switch
20 routes the RF Source back to the PNA-X Port 3, and the Test Set Source
path to Ports 6, 14, 18 and 22 are terminated.
Summary of Contents for U3042AM20
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