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Keysight Technologies
Considerations in Making
Small Signal Measurements


                                          Application Brief




    The ever-increasing demand for
    battery-powered mobile devices
    and more energy efficient green
    product development has triggered
    a rising demand for oscilloscope
    measurement solution that can
    accurately test and measure the
    small signals with higher accuracy.
02 | Keysight | Considerations in Making Small Signal Measurements - Application Brief



Probing considerations                                                                   Higher resolution and lower noise acquisition
If you are measuring the small amplitude of ripple and noise                             When measuring small signals with a large dynamic range, you
on your power rail or devices, you may need to use an oscillo-                           need a measurement resolution that is higher than the 8 bits
scope at or near its more sensitive V/div setting.                                       provided by conventional digitizing oscilloscopes. Rather than
First, try using a probe with a lower attenuation ratio such                             resorting to a high-resolution digitizer or other measuring instru-
as 1:1 probe, rather than using the standard passive probe                               ment, you can use the built-in high-resolution mode or averaging
with 10:1 attenuation ratio that shipped with your instrument.                           mode on your oscilloscope to measure a parameter with a resolu-
With a 10:1 probe, not only is the oscilloscope's base-line                              tion higher than 8 bits and lower noise. Each acquisition mode has
noise floor increased by a factor of 10, but the minimum V/                              pros and cons, but
div setting of scope is also ten times higher than with a 1:1
probe.                                                                                   Use averaging acquisition mode when:
                                                                                          

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