OperatingBasics
20 P7225 2.5 GHz 10X Active Probe UserManua 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 linearity error increases to
±1.0%.
Use the DCoffset adjustment to maintain the probewithin 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 errorspecification does not apply to
input voltages exceeding ±14.0 V (including any DC offset). See
Figure 4 on page 18.
Electrical Effects of Ad apters
The probe tip adapters included with your probe help c onnect to
different types of components. While these adapters make connec-
tions easier, be aware that the adapter you choose may affect the
signal that you are measuring, depending on a vari ety of factors,
including signal frequency, source impedance, and lead l ength.
Use the probe without adapters to optimize step and frequency
response. Using the probe tip adapters adds inductance and
capacitance, which increase step re sponsea nd aberrations, and leads
to increased ripples in frequency response. These effect sinc rease as
the sourceimpedance increases and measured waveformrisetimes
decrease.
Figure 5 onpage 21 illustrates the typical effects on a given signal
using some of the adapters included with your probe.