GUI reference
R&S
®
ZNA
595User Manual 1178.6462.02 ─ 29
The Quickset functionality in the Noise figure setup dialog automatically chooses suita-
ble calibration settings. Manual configuration requires carefully chosen power levels,
depending on the active receiver step attenuator and internal preamplifier configura-
tion.
For a noise figure measurement, the power level at the test port input must not exceed
the values given in the table below.
Table 5-5: Max. power level
Receiving port coupler
standard reversed
Receiver Step Att. = 10 dB 10 dBm 0 dBm
"Receiver Step Att." = 0 dB 0 dBm -10 dBm
"Receiver Step Att." on page 527 = 20 dB -20 dBm -30 dBm
"Preamp. Gain" = 25 dB -25 dBm -35 dBm
"Preamp. Gain" = 30 dB -30 dBm -40 dBm
Choose a source power between -10 dBm and 0 dBm for reference receiver calibra-
tion, to ensure a high-quality calibration.
Values entered for "Calibration Power Settings" and "Ref Receiver Cal Power" are mir-
rored to the "Cal Power Settings" and vice versa. The detector times determine the
trace noise during measurement of the calibration standards and the receiver noise
measurement. Generally, a higher detector time results in a better measurement result.
However, a certain trade-off to the overall calibration and measurement time has to be
found.
If different power levels are configured for the cal standard and/or power meter steps,
the power level is reduced to the respective minimum before every calibration step.
Src Power Thru Meas
Source power for Through measurements during NF calibration.
Remote command:
SOURce<Ch>:NFIGure:CALibration:TPOWer
SOURce<Ch>:NFIGure:CALibration:TPOWer:STATe
Noise Det Meas Time
Defines the detector time of the RMS detector which is used for the noise measure-
ment during a noise figure calibration in channel <Ch>.
Remote command:
[SENSe<Ch>:]NFIGure:CALibration:NTIMe
Gain Det Meas Time
Defines the detector time of the AVG detector which is used for the gain measurement
during a noise figure calibration in channel <Ch>.
Cal softtool
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