Back Probing

Back-probing terminals is done when live circuit measurements are required. It is always better to back-probe a terminal than it is to pierce a wire's insulation to obtain a measurement.

CHECKING THE METER’S RESISTANCE.

METER READING OHMS WITH WIRES NOT CONNECTED

I set the meter at ohms and made sure that the leads were not touching anything. Then I took the reading and it came out to be (0.L.). This meant there was an open circuit and the probes were not connected together and thus the reading was this which means infinity.

METER READING OHMS WHEN WIRES CONNECTED

Again I set the meter at ohms and then connect the wires together i.e. both the probes in contact with each other. The meter was reading 0.3 ohms which mean the meter had an internal resistance of 0.3 ohms and the reading meant that the circuit was closed.

PRACTICING BACK PROBING CONNECTORS

I took a hard shell connector, with the attached terminals and wires. Then I back probed a wire on one side and probed gently from the front on the other side. Then I measured the resistance and the reading was 0.3 ohms. The reading showed me that the circuit was closed and thus I had made a good connection.