3 Spectrum Analyzer Mode
3.2 Swept SA Measurement
Remote
Command
:DISPlay:WINDow[1]:TRACe:Y[:SCALe]:RLEVel <real>
:DISPlay:WINDow[1]:TRACe:Y[:SCALe]:RLEVel?
Example Set the reference level to 20dBm, which displays in the current Y axis unit. For example, if the Y axis
unit is dBmV, then 126.99dBmV is displayed:
:DISP:WIND:TRAC:Y:RLEV 20 dBm
Couplings If you reduce the attenuation, the instrument may have to lower the reference level to keep it below its
allowed maximum. This allowed maximum level is specified in the “Max” row, below, along with other
variables that affect it
When you increase attenuation, the reference level does not change
Note that there is no coupling in N9042B
Preset 0 dBm
State Saved Saved in instrument state
Min/Max The minimum Ref Level is -170 dBm + RefLevelOffset - ExtGain
The maximum Ref Level is typically:
N9042B +250, Note this value does not change
EXA (except N9010N), CXA and
CXA-m
+23dBm + RL Offset – External Gain
VXT model M9421A +33dBm + RL Offset – External Gain
VXT models M9410A/11A/15A +30dBm + RL Offset – External Gain
M8920A Ant Port: +30dBm + RL Offset – External Gain
T/R Port, Low Power Mode: +33dBm + RL Offset – External
Gain
T/R Port, High Power Mode: +47dBm + RL Offset –
External Gain
All other models +30dBm + RL Offset – External Gain
The maximum may be further limited by the current value of other parameters, including Mech Atten,
Int Preamp Gain, Swept IF Gain, FFT IF Gain, Max Mixer Level, and the total attenuation currently
available. This maximum value is determined by the maximum power that can be safely applied to the
input circuitry
Note that the maximum reference level is unaffected by the input choice of external mixing
Annotation The reference level is displayed above and to the left of the graticule with the title “Ref”
Amplitude Representations
The following is an illustration of the reference level and Y-Axis scales under various
conditions:
Spectrum Analyzer Mode User's &Programmer's Reference 203
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