Pjp 250mhz oscilloscope probe pjp t 2021 iec x1 x10 oscilloscope probe body black green 1 2m coaxial cable attenuation x1 25mhz bandwidth 14ns rise time attenuation x10 10mr input impedance 15pf capacitance 250mhz bandwidth 1 4ns rise time 10 to 60pf compensation oscilloscopes from 400vp to 600vp cat i basic insulation pollution degree 2 pjp t 2021 iec professional modular oscillo probe