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Operating Basics
20
P7225 2.5 GHz 10X Active Probe User Manua l
Input Linear Dynamic Range
The probe head amplifier used by the P7225 has a limited linear
operating range. The usable dynamic range is ±4.0 V however, to
keep the input linearity error less than ±0.1%, you must limit the
apparent signal input voltage to ±3.75 V. If you use the full signal
input voltage of ±4.0 V, then the input lineari ty error increases to
±1.0%.
Use the DC offset adjustment to maintain the probe within the
dynamic range. The nominal offset adjustment range of the P7225 is
±10.0 V.
NOTE. The probe can tolerate input voltages of ±30 V without
damage; however, the linearity error specification does not apply to
input voltages exceeding ±14.0 V (including any DC offset). Se e
Figure 4 on page 18.
Electrical Effects of Adapters
The probe tip adapters included with your probe help connect to
different types of components. While these adapters make connec-
tions easier, be aware tha t the a dapter you c hoose may affect the
signal that you are measuring, depending on a variety of factors,
including signal frequency, source impedance, and lead length.
Use the probe without adapters to optimize step and frequency
response. Using the probe tip adapters adds inductance and
capacitance, which increase step response and aberrations, and leads
to increased ripples in frequency response. These effects increase as
the source impedance increases and measured waveform risetimes
decrease.
Figure 5 on page 21 illustrates the typical effects on a given signal
using some of the adapters included with your probe.