Amphenol 112461 BNC Tee Adapter, Jk-Pl-Jk, 50 Ohm Impedance, 4Hz Max Frequency

for low-speed signals oscilloscopes typically use a high impedance input to make measurements this follows the concept of impedance bridging where the load in this case the scope is much higher impedance in the source the device under test this helps to maximize the voltage at the scope while limiting the current this maximizes signal integrity for the measurements as we said this works great for low-speed signals as waveforms get faster capacitance or inductance in the device under test add some reactance into the system which creates reflections in the signal to reduce reflections the load impedance source impedance and characteristic impedance of the cabling should all be the same by convention electronic engineers use 50 ohm impedance for most applications today 75 ohm is also used for some cable applications other values are also possible but 50 ohms is commonly used with oscillosc