R&S ZNB Series - 8.2.8 Fixture modeling

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R&S
®
ZNB/ZNBT
1527User Manual 1173.9163.02 ─ 62
8.2.8 Fixture modeling
We create and apply a fixture model for single-ended deembedding at ports 1 and 2
using the ISD tool.
Prepare the channel
*RST
:SENSe1:FREQuency:STARt MINimum
:SENSe1:FREQuency:STOP MAXimum
Perform a full two-port calibration at ports 1 and 2
For an example, see "// 2 port TOSM" on page 1516
Measure the test coupon
We are using a single-ended (2-port) "Symmetric 2x Thru" coupon (balanced). Connect
it to ports 1 and 2.
:CALCulate:FMODel:ISD1:COUPon:TYPE SYMMetric2x
:CALCulate:FMODel:ISD1:COUPon:STATe 1
:CALCulate:FMODel:ISD2:COUPon:STATe 1
:CALCulate:FMODel:ISD3:COUPon:STATe 0
:CALCulate:FMODel:ISD4:COUPon:STATe 0
:CALCulate:FMODel:ISD:COUPon:MEASure
Measure the DUT together with the test fixture
Connect DUT + test fixture to ports 1 and 2.
:CALCulate:FMODel:ISD1:DUT:STATe 1
:CALCulate:FMODel:ISD2:DUT:STATe 1
:CALCulate:FMODel:ISD3:DUT:STATe 0
:CALCulate:FMODel:ISD4:DUT:STATe 0
:CALCulate:FMODel:ISD1:DUT:MEASure
:CALCulate:FMODel:ISD1:RUN:STATe 1
:CALCulate:FMODel:ISD2:RUN:STATe 1
:CALCulate:FMODel:ISD3:RUN:STATe 0
:CALCulate:FMODel:ISD4:RUN:STATe 0
:CALCulate:FMODel:ISD:RUN:RUN
Measure the DUT together with the test fixture
Run the ISD tool and apply the generated s2p files to port 1 (unswapped) and port 2
(swapped).
:CALCulate:FMODel:ISD1:RUN:STATe 1
:CALCulate:FMODel:ISD2:RUN:STATe 1
:CALCulate:FMODel:ISD3:RUN:STATe 0
:CALCulate:FMODel:ISD4:RUN:STATe 0
:CALCulate:FMODel:ISD:RUN:RUN
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