Keysight 42941A Operation And Service Manual page 22

Operation
DUT Measurement
Adjusting the Pin-to-GND Gap
The gap between the pin and the GND contact is adjustable for DUT, ranging
from 0.5 mm to 13.5 mm. To adjust the gap, release the screw fastening the
GND contact and then rotate the contact
The probe is grounded 25 W (nominally). Do not connect the probe directly
to the circuit with a DC output. If you connect a circuit with a DC output,
resulting in as follows.
In the case of measuring a circuit that could output a DC signal, connect an
appropriate DC-blocking capacitor to the probe.
Figure 3-8 Adjusting the Pin-to-GND Gap
22
It may cause the probe to be damaged.
It may influence the circuit to not perform correctly or may damage it entirely.
Measurement value will be incorrect.
(Figure 3-8).
Keysight 42941A Impedance Probe Kit