LPT-3000 Remote User
’
s Guide
47
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[Figure 7-5] Signal Resolution where RBW is 100kHz
3. Measurement of a Small Signal
The small signal measuring capacity of the LPT-3000R is restricted by its internally generated noise level.
Small signals with low power level may become blocked by the LPT-3000R noise level. For sensitivity of
small signal measurement, equipment setup is the most important element. Setup status influences the
internal noise level of the LPT-3000R.
RBW setup places the most significant impact on the internal noise level of the LPT-3000R and the input
terminal attenuator influences the level of signals measured. Ultimately, S/N ratio (signal to noise ratio)
must be set high to be able to accurately measure small signals (RBW, Atten
Set relatively low). A
number of examples of how to measure small signals are listed below. In case it is still difficult to
distinguish between small signals and noise after RBW and attenuator setup, visibility can be improved
by using bandwidth reduction and the video average function. Video bandwidth reduction and average
function are used to average the irregularly generated noise.