50 ohms = 5 volts Peak

75 ohms = 10 volts Peak

1K ohms = 15 volts peak

1 Meg ohms = 20 volts peak

Is there a relationship between the input load resistance and Voltage Peak input on bench equipment like frequency counter inputs?

Why is it 50 ohms at 5 volts peak? and 1 meg ohms 20 volts peak

What is the relationship between the input resistance and input load , i don't get it?