The :CALCulate{1-16}:FSIMulator:NETWork subsystem commands use existing calibration files with a simulated network of various types to evaluate predicted performance. The commands apply to the active network.
Calibration Simulation Subsystems
These subsystems are used to create a calibrated state in the instrument which is followed by adding the required error correction coefficients for the required calibration type. If this approach is used, each error correction coefficient is entered by separate commands. Simulated calibration subsystems are:
Set the current network other dielectric even value on the indicated channel.
Output the current network dielectric even value on the indicated channel.
For the purposes of entering line information, the MS4640A VNAs use an even/odd mode formalism as is consistent with many circuit simulators. The central concept is that a coupled line pair can be driven in phase (the even mode) or 180 degrees out of phase (the odd mode) or any combination of those modes. The term “common-mode” is also used for even mode. The term “differential-mode” is also used for odd mode. In the case of very weak coupling where Cx is close to 0, these modes see the same impedances, same losses, and same phase velocities so there is no need to use this mode separation. As the coupling increases, at the very least, the impedances seen by these two modes diverge requiring two impedance entries where the effective capacitances seen by the conductors in the two modes are clearly different. That is the end of changes for symmetric TEM systems, where this approach will work for common coax, stripline and some microstrip cases.
Set the current network other dielectric odd value on the indicated channel.
Output the current network dielectric odd value on the indicated channel.
For the purposes of entering line information, the MS4640A VNAs use an even/odd mode formalism as is consistent with many circuit simulators. The central concept is that a coupled line pair can be driven in phase (the even mode) or 180 degrees out of phase (the odd mode) or any combination of those modes. The term “common-mode” is also used for even mode. The term “differential-mode” is also used for odd mode. In the case of very weak coupling where Cx is close to 0, these modes see the same impedances, same losses, and same phase velocities so there is no need to use this mode separation. As the coupling increases, at the very least, the impedances seen by these two modes diverge requiring two impedance entries where the effective capacitances seen by the conductors in the two modes are clearly different. That is the end of changes for symmetric TEM systems, where this approach will work for common coax, stripline and some microstrip cases.
Set the current network line loss even value on the indicated channel.
Output the current network line loss even value on the indicated channel.
For the purposes of entering line information, the MS4640A VNAs use an even/odd mode formalism as is consistent with many circuit simulators. The central concept is that a coupled line pair can be driven in phase (the even mode) or 180 degrees out of phase (the odd mode) or any combination of those modes. The term “common-mode” is also used for even mode. The term “differential-mode” is also used for odd mode. In the case of very weak coupling where Cx is close to 0, these modes see the same impedances, same losses, and same phase velocities so there is no need to use this mode separation. As the coupling increases, at the very least, the impedances seen by these two modes diverge requiring two impedance entries where the effective capacitances seen by the conductors in the two modes are clearly different. That is the end of changes for symmetric TEM systems, where this approach will work for common coax, stripline and some microstrip cases.
Set the current network line loss odd value on the indicated channel.
Output the current network line loss odd value on the indicated channel.
For the purposes of entering line information, the MS4640A VNAs use an even/odd mode formalism as is consistent with many circuit simulators. The central concept is that a coupled-line pair can be driven:
• In phase (the even mode, also called common-mode) or
• 180 degrees out of phase (the odd mode, also called differential-mode) or
• Any combination of those modes.
The term “common-mode” is also used for even mode. The term “differential-mode” is also used for odd mode. In the case of very weak coupling where Cx is close to 0, these modes see the same impedances, same losses, and same phase velocities so there is no need to use this mode separation. As the coupling increases, at the very least, the impedances seen by these two modes diverge requiring two impedance entries where the effective capacitances seen by the conductors in the two modes are clearly different. That is the end of changes for symmetric TEM systems, where this approach will work for common coax, stripline and some microstrip cases.
Cmd Parameters
<NRf> The input parameter is in dB/mm.
Query Parameters
NA
Query Output
<NR3> The output parameter is in dB/mm.
Range
MPND
Default
0.00000000000E+000
Syntax Example
:CALC1:FSIM:NETW:LOSS:ODD 3.0E0
:CALC1:FSIM:NETW:LOSS:ODD?
:CALCulate{1-16}:FSIMulator:NETWork:MODe <char1>
:CALCulate{1-16}:FSIMulator:NETWork:MODe?
Description
The command sets the current network embed/de-embed mode on the indicated channel.
The query outputs the current network embed/de-embed mode on the indicated channel.
Cmd Parameters
<char1> EMBed | DEEMbed
Query Parameters
NA
Query Output
<char1> EMB | DEEM
Range
NA
Default Value
EMB
Syntax Example
:CALC1:FSIM:NETW:MOD EMB
:CALC1:FSIM:NETW:MOD?
:CALCulate{1-16}:FSIMulator:NETWork:PORT <char1>
:CALCulate{1-16}:FSIMulator:NETWork:PORT?
Description
The command sets the current network port number on the indicated channel. The use of Port 3 and/or Port 4 requires a 4-Port VNA instrument.
The query outputs the current network port number on the indicated channel.
The command sets the current R network resistance value on the indicated channel.
The query outputs the current R network resistance value on the indicated channel.
Cmd Parameters
<NRf> The input parameter is in Ohms.
Query Parameters
NA
Query Output
<NR3> The output parameter is in Ohms.
Range
MPND
Default Value
0.00000000000E+000
Syntax Example
:CALC1:FSIM:NETW:R 7.5E1
:CALC1:FSIM:NETW:R?
:CALCulate{1-16}:FSIMulator:NETWork:S2P <string>
:CALCulate{1-16}:FSIMulator:NETWork:S2P?
Description
The command sets the current network S2P filename on the indicated channel. The query outputs the current network S2P filename on the indicated channel.
This command requires a 4-Port VNA instrument. Sets the port assignments for the current S4P network to be embedded/de-embedded on the channel indicated.
Output the port assignments for the current S4P network to be embedded/de-embedded on the channel indicated.
The port assignments are set by four <char> values where:
• The <char1> value sets the Port 1 assignment.
• The <char2> value sets the Port 2 assignment.
• The <char3> value sets the Port 3 assignment.
• The <char4> value sets the Port 4 assignment.
• When considered as a set, the value of each <char> must be unique.
This command requires a 4-Port VNA instrument. The command sets one or more S-Parameter terms to ignore from the current S4P network to be embedded/de-embedded on the channel indicated. At least one S-Parameter must be specified. Up to 16 S-parameters can be specified.
The query outputs the S-Parameter terms to ignore from the current S4P network to be embedded/de-embedded on the channel indicated.
The command sets the current network swap S2P file data flag on the indicated channel.
The query outputs the current network swap S2P file data flag on the indicated channel.
Cmd Parameters
<char1> TRUE | FALSe | 1 | 0
Query Parameters
NA
Query Output
<char1> 1 | 0
Range
NA
Default Value
FALS
Syntax Example
:CALC1:FSIM:NETW:SWAP TRUE
:CALC1:FSIM:NETW:SWAP?
:CALCulate{1-16}:FSIMulator:NETWork:TYPe <char1>
:CALCulate{1-16}:FSIMulator:NETWork:TYPe?
Description
The command sets the current network type on the indicated channel. The query outputs the current network type on the indicated channel. The available network choices depend on whether the instrument is in 2-Port or 4-Port VNA mode. All 2-Port networks are available for 4-Port VNAs. The following network types are available:
Types Available for 2-Port VNA Instruments
If the instrument is in two-port mode, the following types are available:
• LS = 2-Port or 4-Port VNAs. Series inductance
• LP = 2-Port or 4-Port VNAs. Parallel inductance
• CS = 2-Port or 4-Port VNAs. Series capacitance
• CP = 2-Port or 4-Port VNAs. Parallel capacitance
• RS = 2-Port or 4-Port VNAs. Resistive series network.
• RP = 2-Port or 4-Port VNAs. Resistive parallel network.
• TLine = 2-Port or 4-Port VNAs. A defined transmission line with specifications for Impedance (Ohms), Length (Meters), Loss (dB/mm), @ Frequency (GHz), and Dielectric Value. Note that programmatically, length is entered in Meters. From the user interface, length is usually entered in millimeters.
• S2Pfile = 2-Port or 4-Port VNAs. Allows an S2P calibration file to be used.
Types Available for 4-Port VNA Instruments
If the instrument is in four-port mode, all of the network types above are available with the addition of the following network types:
• S4Pfile = 4-Port VNAs only. Allows an S4P calibration file to be used.
• LCKTFour = 4-Port VNAs only. A four-node inductance L circuit. Port assignments are defined in separate commands.
• CCKTFour = 4-Port VNAs only. A four-node capacitance C circuit. Port assignments are defined in separate commands.
• TLINEFour = 4-Port VNAs only. Allows two separate through (“thru”) lines to be used. In separate commands, each line is defined by Length (Meters), @ Frequency (GHz), Z0-Odd (Ohms), Loss-Odd (dB/mm), Dielectric Odd (unitless number), Z0Even (Ohms), Loss-Even (dB/mm), and Dielectric Even (unitless number). Note that programmatically, length is entered in Meters. From the user interface, length is usually entered in millimeters.
• RCKTFour = 4-Port VNAs only. A four-node resistive R circuit. Port assignments are defined in separate commands.
The command sets the current T-Line network impedance Z0 (Z zero) value on the indicated channel. The query outputs the current T-Line network impedance value on the indicated channel.
Cmd Parameters
<NRf> The input parameter is in Ohms.
Query Parameters
NA
Query Output
<NR3> The output parameter is in Ohms.
Range
MPND
Default Value
50.00000000000E+000
Syntax Example
:CALC1:FSIM:NETW:Z0 7.5E1
:CALC1:FSIM:NETW:Z0?
:CALCulate{1-16}:FSIMulator:NETWork:Z0:EVEN <NRf>
:CALCulate{1-16}:FSIMulator:NETWork:Z0:EVEN?
Description
Set the current network impedance Z0 (Z zero) even value on the indicated channel. Output the current network impedance even value on the indicated channel. For the purposes of entering line information, the MS463xA/MS464xA Series VNAs use an even/odd mode formalism as is consistent with many circuit simulators. The central concept is that a coupled line pair can be driven in phase (the even mode) or 180 degrees out of phase (the odd mode) or any combination of those modes. The term “common-mode” is also used for even mode. The term “differential-mode” is also used for odd mode. In the case of very weak coupling where Cx is close to 0, these modes see the same impedances, same losses, and same phase velocities so there is no need to use this mode separation. As the coupling increases, at the very least, the impedances seen by these two modes diverge requiring two impedance entries where the effective capacitances seen by the conductors in the two modes are clearly different. That is the end of changes for symmetric TEM systems, where this approach will work for common coax, stripline and some microstrip cases.
Cmd Parameters
<NRf> The input parameter is in Ohms.
Query Parameters
NA
Query Output
<NR3> The output parameter is in Ohms.
Range
MPND
Default
50.00000000000E+000
Syntax Example
:CALC1:FSIM:NETW:Z0:EVEN 7.5E1
:CALC1:FSIM:NETW:Z0:EVEN?
:CALCulate{1-16}:FSIMulator:NETWork:Z0:ODD <NRf>
:CALCulate{1-16}:FSIMulator:NETWork:Z0:ODD?
Description
Set the current network impedance odd value on the indicated channel. Output the current network impedance odd value on the indicated channel. For the purposes of entering line information, the MS463xA/MS464xA Series VNAs use an even/odd mode formalism as is consistent with many circuit simulators. The central concept is that a coupled line pair can be driven in phase (the even mode) or 180 degrees out of phase (the odd mode) or any combination of those modes. The term “common-mode” is also used for even mode. The term “differential-mode” is also used for odd mode. In the case of very weak coupling where Cx is close to 0, these modes see the same impedances, same losses, and same phase velocities so there is no need to use this mode separation. As the coupling increases, at the very least, the impedances seen by these two modes diverge requiring two impedance entries where the effective capacitances seen by the conductors in the two modes are clearly different. That is the end of changes for symmetric TEM systems, where this approach will work for common coax, stripline and some microstrip cases.