Linear Technology DC2460A Demo Manual page 3

NOTES ON TEST EQUIPMENT AND SETUP
High performance signal generators with low harmonic
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outputs should be used for 2-tone measurements. Oth-
erwise, low pass filters at the signal generator outputs
should be used to suppress harmonics.
High quality combiners should be used to present a
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broadband 50Ω termination on all ports as well as
provide good port-to-port isolation. Adding attenuator
pads further improves source isolation and helps prevent
the signal generators from producing intermodulation
products.
Spectrum analyzers can produce significant internal
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distortion products if they are overdriven. Generally,
DEMO MANUAL DC2460A
spectrum analyzers are designed to operate at their
best with about –30dBm to –40dBm at their input. The
spectrum analyzer's input attenuation setting should be
used to avoid saturating the instrument.
Set the spectrum analyzer's input attenuation depending
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on the spectrum analyzer used.
Before performing measurements on the DUT, the sys-
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tem performance should be evaluated to ensure that
a clean input signal is obtained and that the spectrum
analyzer's internal distortion is minimized.
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