Operation 4Keysight 85024A User’s and Service Guide 33Operating InstructionsGrounding the probeProper grounding is important when making measurements with any probe. Theprobe is supplied with two grounding devices: an alligator-type ground clip and aslip-on type ground tip. Use the shortest ground path possible. Proper groundingbecomes more important as frequency increases. For optimum measurements in afactory environment, design your circuits with ground-plane feedthroughs next toevery test point.Retracting and extending the protective sleeveHold the probe wand in one hand, pointing the tip away from yourself. Grasp theprobe sleeve in the other hand and turn about 1/4 turn counter-clockwise. Now,pull the sleeve toward you while slowly turning it counter-clockwise. The sleevewill now retract quickly with little counter-clockwise rotation. Reverse thisprocedure to extend the sleeve.CAUTION Discharging the Probe Between MeasurementsMeasuring a node having a DC voltage potential charges blocking capacitorsinside of the probe. Ground the probe tip after measuring such nodes todischarge the probe capacitors.Failure to do this can result in damage to sensitive circuits in the DUT,especially if it is an active device.