Nanosecond (ns): A unit of time equivalent to 10-9 seconds.
Negative Feedback: Feedback fron the output of an analogue circuit that tends to oppose the input. This has the effect of stabilising the circuit.
Network: A group of computers that are connected to each other by communications lines to share information and resources.
Nibble: One half of a byte.
Ni-cad: Nickel-Cadmium cell. Type of rechargeable battery.
NMR (Normal-Mode Rejection): The ability of a panel meter to filter out noise superimposed on the signal and applied across the SIG HI to SIG LO input terminals. Normally expressed in dB at 50/60 Hz.
Noise: An unwanted voltage or current in an electrical circuit.
Nor gate: Gate whose output is 0 if any of its inputs is a 1.
Normal-mode Rejection Ratio: The ability of an instrument to reject interference usually of line frequency (50-60 Hz) across its input terminals.
Not gate: Logic element that acts as an inverter.
NPN: Type of bipolar transistor using n-type p-type n-type material in its manufacture.
Null: A condition, such as balance, which results in a minimum absolute value of output.