Hand (unit) radix numbering system, where a hand is four inches. The hand, sometimes also called a handbreadth or handsbreadth, is an anthropic unit, originally based on the breadth of a male human hand, either with or without the thumb, or on the height of a clenched fist. On surviving Ancient Egyptian cubit-rods, the royal cubit is divided into seven palms of four digits or fingers each. Five digits are equal to a hand, with thumb; and six to a closed fist. The royal cubit measured approximately 525 mm, so the length of the ancient Egyptian hand was about 94 mm. In
Source measure unit cells, or other energy generating devices. SMUs also offer greater speed and precision and typically support wider operating ranges. The built-in sourcing capabilities of an SMU work with the instrument’s measurement capabilities to reduce measurement uncertainty and support low current and more flexible resistance measurements. In voltage measurements system-level leakage can be suppressed more easily than with separate instruments. In current measurements, the SMU’s design reduces voltage burden. For resistance measurements, SMUs provide programmable source values, useful for protecting the device being tested. Notable features of SMUs include the following: Source measure unit The Source measure unit (SMU) is a