Command Reference
R&S
®
ZNC
591
User Manual 1173.9557.02 ─ 13
If the stop frequency entered is smaller than the current start frequency, the start fre-
quency is set to the stop frequency minus the minimum frequency span.
6.3.14.9
[SENSe:]LPORt...
The
[SENSe:]LPORt...
commands define the reference impedances of the balanced
ports.
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[SENSe<Ch>:]LPORt<LogPt>:ZCOMmon
<RealPart>[, <ImaginaryPart>]
[SENSe<Ch>:]LPORt<LogPt>:ZDIFferent
<RealPart>[, <ImaginaryPart>]
These commands specify the complex common mode and differential mode reference
impedances for the balanced (logical) port numbered
<LogPt>
.
Suffix:
<Ch>
.
Channel number
<LogPt>
Logical port number. The logical ports must be defined using
<PhysicalPort1>,
<PhysicalPort2>
. An n port analyzer supports a maximum of
n/2 (n even) or (n - 1)/2 (n odd) logical ports.
Parameters:
<RealPart>
Real part of the port impedance.
Range:
1 mΩ to 10 MΩ
*RST:
ZCOMmon: 25 Ω; ZDIFferent: 100 Ω (real impedan-
ces)
Default unit: Ohm
<ImaginaryPart>
Imaginary part of the port impedance; may be omitted to define a
real impedance.
Range:
- 10 MΩ to 10 MΩ
*RST:
0 Ω (real impedances)
Default unit: Ohm
Example:
*RST; :CALC:PAR:DEL 'TRC1'
Reset the analyzer and delete the (default) trace for channel no.
1.
SOUR:LPOR1 1,2
Combine the physical ports no. 1 and 2 to define the balanced
(logical) port no. 1.
LPOR1:ZDIF 27, 2
Specify a complex differential mode reference impedance of
27Ω + j * 2Ω for the defined port.
Manual operation:
See
"Common Mode / Differential Mode"
SCPI Command Reference