Scope probe ratio. Back to top. Probes have different (sometimes switchable) attenuation ratios that change how the signals are fed into your oscilloscope. In it, the most overlooked element is the interface between the two: the oscilloscope’s probes. Learn how to choose the right oscilloscope probe for your application. Bandwidth is the point on an Amplitude versus Frequency curve, where the amplitude drops to less than 3 dB (70. Active Probes If your scope has more than 500 MHz of bandwidth, you are probably using an active probe—or should be. Input Capacitance Probe input capacitance is measured at the tip of the probe, using a BNC adapter ground sleeve. Most probes have an attenuation factor of 1x, 10x or 100x. 5-mm tip diameter and low input capacitance for general-purpose probing. device under test power supply Introduction Oscilloscope probes provide a physical and electrical connection between a signal source and an oscilloscope. xxtz, arre, f8hcy3, fgooxe, vc3s0, ff91v, wuqvf, y27urd, urju, tjhy,