Tektronix P7225 User Manual
Operating Basics
20
P7225 2.5 GHz 10X Active Probe User Manual
Input Linear Dynamic Range
The probe head amplifier used by the P7225 has a limited linear
operating range. The usable dynamic range is
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 DC offset adjustment to maintain the probe within the
dynamic range. The nominal offset adjustment range of the P7225 is
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
damage; however, the linearity error specification does not apply to
input voltages exceeding
±14.0 V (including any DC offset). See
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 that the adapter you choose may affect the
signal that you are measuring, depending on a variety of factors,
including signal frequency, source impedance, and lead length.
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 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.
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.
using some of the adapters included with your probe.