Consequently, a one-meter direct ( 1X ) coaxial probe will load a circuit with a capacitance of about 110 pF and a resistance of 1 megohm.
22.
A typical probe uses a 9 megohm series resistor shunted by a low-value capacitor to make an RC compensated divider with the cable capacitance and scope input.
23.
The probe cables usually have a characteristic impedance of 50 ohms and connect to oscilloscopes with a matched 50 ohm ( rather than a 1 megohm ) input impedance ).
24.
Consequently, a one-meter high-impedance direct ( 1?) coaxial probe may load the circuit with a capacitance of about 110 pF and a resistance of 1 megohm.
25.
The cable capacitance of 90 pF in parallel with the scope input of 20 pF and 1 megohm ( total capacitance 110 pF ) also gives a time constant of 110 microseconds.
26.
If your resistance ( including dry boots ) was . 5 megohm, then the leakage through the fence would be a small factor and you would get a pretty good jolt.
27.
If one fence insulator has a resistance of, say 50 megohms to ground, then 10 would have a combined resistance of 5 megohms ( the leakages would be in parallel ).
28.
If one fence insulator has a resistance of, say 50 megohms to ground, then 10 would have a combined resistance of 5 megohms ( the leakages would be in parallel ).
29.
Adding humidity might allow the static to discharge naturally, or you might prefer to add a slow discharge circuit ( experiment with a connection to earth through a resistor of many megohms ).
30.
A modern digital voltmeter such as the Fluke 87V has a 10 megohm input impedance, so is if is measuring say a 1.5 volt emf, it would draw 0.15 microamperes.
