Teledyne LeCroy Passive Probe PP023 Passive probes are the standard probe provided with most oscilloscopes. They are also sold as separate items and as replacements. The PP023 (PP023-1 single pack, PP023-2 two pack) has 500 MHz bandwidth, 10 pF input capacitance and 2.5 mm probe tip diameter. It is typical of passive probes in that it provides a 10:1 attenuation and features a high resistance of 10 MΩ. Its high input resistance makes the passive probe a choice instrument for low frequency signals, because circuit loading at such frequencies is minimised. Passive probes are designed to handle voltages of at least 400 V. The PP023 handles up to 500 V. Teledyne LeCroy passive probes feature an attenuation sense pin which activates the oscilloscope to scale waveforms automatically, with no operator input.