Interpolation - Keysight x-series User Reference Manual

10 Monitor Spectrum Measurement
Meas Setup
Couplings
Preset
State Saved
Range
Initial S/W Revision

Interpolation

Accesses a menu that lets you set the frequency and amplitude interpolation of the selected limit.
Key Path
Readback
Initial S/W Revision
Frequency Interpolation
Sets the interpolation between frequency points, allowing you to determine how limit trace values are
computed between points in a limit table. The available interpolation modes are linear and logarithmic. If
frequency interpolation is logarithmic (Log), frequency values between limit points are computed by first
taking the logarithm of both the table values and the intermediate value. A linear interpolation is then
performed in this logarithmic frequency space. An exactly analogous manipulation is done for logarithmic
amplitude interpolation.
Note that the native representation of amplitude is in dB.
For linear amplitude interpolation and linear frequency interpolation, the interpolation is computed as:
For linear amplitude interpolation and log frequency interpolation, the interpolation is computed as:
For log amplitude interpolation and linear frequency interpolation, the interpolation is computed as:
For log amplitude interpolation and log frequency interpolation, the interpolation is computed as:
792
This matters when testing a trace or limit line for failure, via :CALC:MON:LLIN3:FAIL? or
:CALC:MON:TRAC2:FAIL?
1|1|2|2|3|3
Saved in instrument state
1|2|3
A.13.00
Meas Setup, Limits, Properties
In square brackets, the state of Frequency Interpolation then the state of Amplitude Interpolation,
separated by commas, as [Lin Frequency, Log Amplitude]
A.13.00
EMI Receiver Mode Reference