P7225 2.5 GHz 10X Active Probe UserManua l 17
Configuration
The P7225 provides the host instrument with the probe model
number, serial number, and attenuation factor. When connected t o a
host instrument with a TekConnect Interface, display readouts are
corrected for the probe attenuation factor, the instrument input is set
to 50 Ω,and the c oupling is set to DC. The probe offset control is
controlled by the host instrument.

Probe Offset

The probe offsetis adjustable to permit operation withinthe linear
range of the probe. Using the offset to cancel DC signal components
enables optimalprobe performance. See Figure 4 on page18 for
more information.
NOTE. See your host instrument manual for specific instructionson
its operationand offset control.
To set the probe offset, follow these steps:
1. Ground the input of the probe.
NOTE. The probe mustbe te rminated with low impedence (<100 Ω)
to correctlydisplay offset voltage.
2. Use the verticalposition control to set a zero reference level on
the host instrument display.
3. Set the host instrument to 1 V/div.
4. Attach the probeto the circuit.
5. Adjust the probe offset to bring the trace to the host instrument
zero reference.