User's Manual

P7225 2.5 GHz 10X Active Probe User Manual

Configuration

The P7225 provides the host instrument with the probe model

number, serial number, and att enuation factor. When connected to a

host instrument with a TekConnect Interface, display rea douts are

corrected for the probe atte nuation factor, the instrument input is set

to 50 Ω, and the coupling is set to DC. The probe offset control is

controlled by the host i nstrument.

Probe Offset

The probe offset is adjustable to permit operation within the linear

range of the probe. Using the offset to cancel DC signal components

enables optimal probe performance. See Figure 4 on page 18 for

more information.

NOTE. See your host instrument manual for specific instructions on

its operation and offset control.

To set the probe offset, follow these steps:

1. Ground the input of the probe.

NOTE. The probe must be terminated with low impede nce (<100 Ω)

to correctly display offset voltage.

2. Use the vertical position control to set a zero reference level on

the host instrument display.

3. Set the host instrume nt t o 1 V/div.

4. Attach the probe to the circuit.

5. Adjust the probe offset to bring the trace to the host i nstrument

zero reference.