This subsystem controls the True Differential Mode (with option R&S ZVA-K6).
Command tree: SOURce<Ch>TDIF
Selects a logical (balanced) port for the amplitude imbalance sweep in true differential mode. A balanced port configuration must be defined and an amplitude imbalance sweep must be active to use this command; see program example.
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<Ch> |
Channel number.
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<Log Port> |
Logical port number of the balanced port. The balanced port must be defined using SOURce<Ch>:LPORt<log_port> before it can be selected. |
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Range [def. unit] |
Depending on the number of balanced ports defined. [–]
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SCPI, Command Types |
Device-specific, command or query
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Example: |
*RST; SOUR:LPOR1 1,3 Reset the analyzer and combine the physical ports 1 and 3 to the logical port 1. SWE:TYPE IAMP; :SOUR:TDIF? Select an amplitude imbalance sweep. This sweep type automatically activates the true differential mode (the query returns 1). CALC:TDIF:IMB:COMP ON Use imbalance-compensated wave quantities to calculate S-parameters, ratios and derived quantities. SOUR:TDIF:IMB:AMPL:LPOR 1; STAR -20; STOP 0 Configure the amplitude imbalance sweep, selecting the logical port no. 1 and a swept power range between -20 dBm and 0 dBm at the physical port no. 3 (i.e. at the physical port with the highest port number that belongs to the selected logical port). CALC:PAR:SDEF 'Trc1', 'SDS12' Create a new trace named 'Trc1' to measure the mixed mode S-parameter Sds12. DISP:TRAC:FEED 'Trc1' Display the result
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Defines the start power for an amplitude imbalance sweep, which is equal to the left edge of a Cartesian diagram. A balanced port configuration must be defined and an amplitude imbalance sweep must be active to use this command; see program example.
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<Ch> |
Channel number.
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<Start Power> |
Start power of the sweep. |
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Range [def. unit] |
–40 dBm to +9.99 dBm. The exact range depends on the analyzer model; refer to the data sheet [dBm]. UP and DOWN increment/decrement the source power in 0.01-dB steps. The start power must be smaller than the stop power (SOURce<Ch>:TDIF:IMBalance:AMPLitude:STOP). |
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*RST value |
–10 dBm
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SCPI, Command Types |
Device-specific, command or query
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Example: |
See SOURce<Ch>:TDIF:IMBalance:AMPLitude:LPORt
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Defines the stop power for an amplitude imbalance sweep, which is equal to the right edge of a Cartesian diagram. A balanced port configuration must be defined and an amplitude imbalance sweep must be active to use this command; see program example.
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<Ch> |
Channel number.
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<Stop Power> |
Stop power of the sweep. |
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Range [def. unit] |
–39.99 dBm to +10 dBm. The exact range depends on the analyzer model; refer to the data sheet [dBm]. UP and DOWN increment/decrement the source power in 0.01-dB steps. The stop power must be larger than the start power (SOURce<Ch>:TDIF:IMBalance:AMPLitude:STARt). |
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*RST value |
+10 dBm
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SCPI, Command Types |
Device-specific, command or query
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Example: |
See SOURce<Ch>:TDIF:IMBalance:AMPLitude:LPORt
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Selects a logical (balanced) port for the phase imbalance sweep in true differential mode. A balanced port configuration must be defined and a phase imbalance sweep must be active to use this command; see program example.
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<Ch> |
Channel number.
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<Log Port> |
Logical port number of the balanced port. The balanced port must be defined using SOURce<Ch>:LPORt<log_port> before it can be selected. |
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Range [def. unit] |
Depending on the number of balanced ports defined. [–]
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SCPI, Command Types |
Device-specific, command or query
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Example: |
*RST; SOUR:LPOR1 1,3 Reset the analyzer and combine the physical ports 1 and 3 to the logical port 1. SWE:TYPE IPH; :SOUR:TDIF? Select a phase imbalance sweep. This sweep type automatically activates the true differential mode (the query returns 1). SOUR:TDIF:IMB:PHAS:LPOR 1; STAR -20; STOP 0 Configure the phase imbalance sweep, selecting the logical port no. 1 and a swept phase range between -20 deg and 0 deg at the physical port no. 3 (i.e. at the physical port with the highest port number that belongs to the selected logical port). CALC:PAR:SDEF 'Trc1', 'SDS12' Create a new trace named 'Trc1' to measure the mixed mode S-parameter Sds12. DISP:TRAC:FEED 'Trc1' Display the result
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Defines the start phase for a phase imbalance sweep, which is equal to the left edge of a Cartesian diagram. A balanced port configuration must be defined and a phase imbalance sweep must be active to use this command; see program example.
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<Ch> |
Channel number.
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<Start Phase> |
Start phase of the sweep. |
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Range [def. unit] |
–180 deg to +179.99 deg [deg]. UP and DOWN increment/decrement the phase in 1-deg / 0.1-deg / 0.01-deg steps. The start phase must be smaller than the stop phase (SOURce<Ch>:TDIF:IMBalance:PHASe:STOP). |
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*RST value |
–180 deg
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SCPI, Command Types |
Device-specific, command or query
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Example: |
See SOURce<Ch>:TDIF:IMBalance:PHASe:LPORt
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Defines the stop phase for a phase imbalance sweep, which is equal to the right edge of a Cartesian diagram. A balanced port configuration must be defined and a phase imbalance sweep must be active to use this command; see program example.
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<Ch> |
Channel number.
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<Stop Phase> |
Stop phase of the sweep. |
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Range [def. unit] |
–179.99 deg to +180 deg [deg]. UP and DOWN increment/decrement the phase in 1-deg / 0.1-deg / 0.01-deg steps. The stop phase must be larger than the start phase (SOURce<Ch>:TDIF:IMBalance:PHASe:STARt). |
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*RST value |
+180 deg
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SCPI, Command Types |
Device-specific, command or query
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Example: |
See SOURce<Ch>:TDIF:IMBalance:PHASe:LPORt
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Switches the true differential mode on or off. This command is available only if a suitable balanced port configuration is active.
Balanced
port configurations for true differential mode
The true differential mode requires at least one balanced port. The two physical ports of the balanced port must be supplied by different power sources. This means that the analyzer port combinations 1/2, 3/4 are forbidden.
The number of possible port configurations increases with the number of analyzer ports:
For 2-port analyzers, no suitable balanced port configuration is possible.
For 3-port analyzers, either ports no. 1 and 3 or ports no. 2 and 3 can be combined to form a single balanced port. The third port is single-ended (unbalanced).
For 4-port analyzers, the port combinations 1/3, 1/4, 2/3, 2/4 are allowed. The analyzer may contain either one or two balanced ports.
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<Ch> |
Channel number.
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<Boolean> |
ON - True differential mode active |
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*RST value |
OFF
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SCPI, Command Types |
Device-specific, command or query
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Example: |
*RST; SOUR:LPOR1 1,3 Reset the analyzer and combine the physical ports 1 and 3 to the logical port 1. Defining a balanced port configuration deletes the default trace. SOUR:TDIF ON Switch true differential mode on. CALC:PAR:SDEF 'Trc1', 'BD1D2S' Create a new trace to measure the differential received wave quantity bd1, using the single-ended analyzer port no. 2 as a source port.
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Qualifies whether the source power (SOURce<Ch>:POWer<Pt>[:LEVel][:IMMediate][:AMPlitude]) is equal to the power of each single-ended wave or to the balanced waves in true differential mode.
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<Ch> |
Channel number.
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SENDed | |
Single-ended: Same Differential and Common Mode Voltages
as in Single-Ended Mode. |
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*RST value |
– (a reset leaves the setting unchanged)
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SCPI, Command Types |
Device-specific, command or query
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Example: |
*RST; SOUR:LPOR1 1,3 Reset the analyzer and combine the physical ports 1 and 3 to the logical port 1. Defining a balanced port configuration deletes the default trace. SOUR:TDIF ON Switch true differential mode on. SOUR:TDIF:WAV SEND Select single-ended source power mode.
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