LeCroy PP025-1 500 MHz Passive Probe, 5mm, 10:1, 10 MOhm

Passive probes are the standard probe provided with most oscilloscopes. Typical passive probes provide a 10:1 attenuation and feature a high input resistance of 10 MΩ. This high input resistance means that passive probes are the ideal tool for low frequency signals since circuit loading at these frequencies is minimized. Passive probes are designed to handle voltages of at least 400V, some as high as 600V. Teledyne LeCroy passive probes feature an attenuation sense pin which tells the oscilloscope to scale the waveforms automatically requiring no user input.

Each passive probe is recommended for a certain oscilloscope, using the right passive probe with the right oscilloscope means that the probe will be properly compensated across the entire bandwidth. Using probes with a different oscilloscope will only let you compensate for low frequencies.

The Teledyne LeCroy PP025 is a passive high impedance voltage oscilloscope probe designed and calibrated for use with general purpose oscilloscopes having an input impedance of 1 MΩ and can be compensated for use with instruments having an input capacitance between 14 to 25 pF. It is compatible with oscilloscopes that automatically detect probe attenuation and adjust their readout accordingly.
 

Probe Compensation

Proper compensation of the probe is required to assure amplitude accuracy of the waveform being measured by matching the probe to the oscilloscope’s input capacitance. Compensation should be adjusted whenever the probe is connected to or transferred between oscilloscopes.
 

Low Frequency

1. Apply a 1 kHz square wave to the probe or connect to the oscilloscope’s calibrator output.
2. Adjust the single LF trimmer located on the PP025 BNC Box until you achieve a flat-topped square wave (see figure below):

High Frequency

1. Apply a 1 MHz square wave to the probe (< 0.7 ns rise-time).
2. Remove the plastic caps from the two, high-frequency trimmers on the PP025 BNC Compensation Box.
3. Adjust HF2 then HF1 until you achieve a flat-topped square wave (see figure below).

Over-compensated, correct, and under-compensated waveforms