Keysight E6640A, Measurement Applications User & Programmer Reference

Page: 1702 / 2870

12 Code Domain Measurement
Meas
Do Spur Suppression
Example CALC:FPOW:POW1:DEF "DoSpurSuppression=True"
Notes When measuring very low level signals, or when large out-of-band inputs are input into the analyzer,
sometimes unwanted spurs and residuals can appear in the measured spectrum. Spur suppression is a
method to help minimize the levels of these internally generated spurs and residuals.
When spur suppression is enabled, the analyzer will automatically take two acquisitions using two different
internal analog LO frequencies. The FFT spectrums from both acquisitions are combined by taking the
minimum power between both traces on a per FFT bin basis. External signals will have the same amplitude
for both traces and therefore will return the expected amplitudes. However, low level spurs and residuals
generated internally to the analyzer tend to move to different FFT bins depending on the internal analog LO
frequency used, and therefore tend to be suppressed using this spur suppression method.
Because two acquisitions, rather than a single acquisition, are made when spur suppression is enabled, the
measurement time will always be slower when spur suppression is enabled.
Preset False
Range True (enable spur suppression) or False (disable spur suppression)
Default Unit Boolean
Initial S/W
Revision A.14.00
Electronic Attenuator Bypass
Example CALC:FPOW:POW1:DEF "ElecAttBypass =False"
Notes The electronic attenuation bypass parameter allows the user to either utilize or bypass the electronic
attenuator. The electronic attenuator is only available for frequencies up to 3.6 GHz. Set parameter to true
when using frequencies above 3.6 GHz and set the parameter to false when using the preamp.
Preset True
Range True (bypass electronic attenuator) or False (use electronic attenuator)
Default Unit Boolean
Initial S/W
Revision A.14.00
Electronic Attenuation
Example CALC:FPOW:POW1:DEF "ElecAttenuation=10"
Notes Option EA3 is required.
The electronic attenuation value parameter sets the amount of electrical attenuation from 0 to 24 dB (1
dB steps).
Set "ElecAttBypass=False" to make sure the electronic attenuator path is enabled.
Preset 0 dB
Range 0 – 24 dB (1 dB steps)
1702 W-CDMA & HSPA Measurement Applications Reference