Agilent Technologies Signal Analyzer N9030a - Manual (Page 590)

6 RLC Swept SA Measurement Front-Panel & SCPI Reference
Input/Output
YY is AC or DC
ZZ is 50Ω or 75Ω
Initial S/W Revision Prior to A.02.00
Input Z Correction
Sets the input impedance for unit conversions. This affects the results when the y-axis unit is
voltage or current units (dBmV, dBµV, dBµA, V, A), but not when it is power units (dBm, W). The
impedance you select is for computational purposes only, since the actual impedance is set by
internal hardware to 50 ohms. Setting the computational input impedance to 75 ohms is useful
when using a 75 ohm to 50 ohm adapter to measure a 75 ohm device on an analyzer with a 50
ohm input impedance.
There are a variety ways to make 50 to 75 ohm transitions, such as impedance transformers or
minimum loss pads. The choice of the solution that is best for your measurement situation
requires balancing the amount of loss that you can tolerate with the amount of measurement
frequency range that you need. If you are using one of these pads/adaptors with the Input Z Corr
function, you might also want to use the Ext Gain key. This function is used to set a correction
value to compensate for the gain (loss) through your pad. This correction factor is applied to the
displayed measurement values.
Key Path Input/Output, RF Input
Remote Command [:SENSe]:CORRection:IMPedance[:INPut][:MAGNitude] 50|75
[:SENSe]:CORRection:IMPedance[:INPut][:MAGNitude]?
Example CORR:IMP 75 sets the input impedance correction to 75 ohms.
CORR:IMP?
Couplings In the N9000A option C75, when RF Input 2 is selected, the Input Z Correction will automatically
change to 75 ohms. The user may then change it to whatever is desired. When the main RF
Input is selected, the Input Z Correction will automatically change to 50 ohms. The user may
then change it to whatever is desired.
Preset This is unaffected by a Preset but is set to 50 ohms on a "Restore Input/Output Defaults" or
"Restore System Defaults->All"
Some instruments/options may have 75 ohms available.
State Saved Saved in instrument state
Readback 50 Ω or 75 Ω. Current setting reads back to the RF key.
Initial S/W Revision Prior to A.02.00
590 Remote Language Compatibility Measurement Application Reference