The P-20A is a PASSIVE 10:1 RF VOLTAGE RF PROBE with a 50 Volt  DC BLOCK built in. It has been designed to allow users of RF test equipment to use standard signal tracing techniques. The P-20A makes it possible to conveniently and accurately monitor or inject signals up to 3 GHz into RF circuits without significantly loading or detuning them. The P-20A comes with Interchangeable Ground Clips that adapt to a wide range of applications.

   To obtain consistent and accurate RF amplitude measurements PROPER  
 RF grounding is  REQUIRED. 

    Measurements from 100 kHz to 1 GHz can be accurately measured by directly grounding the P-20A’s grounding barrel or by using the short pin or flexible ground clip. Frequencies from 1 to 2 GHz will require  direct grounding of the P-20A’s grounding barrel or the use of the short pin ground clip. Frequencies from 2 to 3 GHz will require direct grounding of the P-20A’s grounding barrel. See Typical P-20A RF probe response for more information.

   Ground clips can be changed by grasping the ring portion of the clip and twisting it,
while pulling to remove or pushing to assemble. Moderate force may be required.

   If a good RF ground is out of reach, a 6 inch metal ruler or similar item can often be 
used to extend the ground to the RF probe. To minimize inductance, it’s better to make 
direct contact with the grounding barrel of the RF probe. 

    Verification of a low inductance RF ground can be accomplished by slightly changing the P-20A ground contact position  while observing that there are no significant changes in readings.