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  2. Current loop - Wikipedia

    en.wikipedia.org/wiki/Current_loop

    To allow the construction of hybrid systems, where the 420 mA is generated by the controller, but allows the use of pneumatic valves, a range of current to pressure (I to P) converters are available from manufacturers. These are usually local to the control valve and convert 420 mA to 3–15 psi (or 0.2–1.0 bar).

  3. Current clamp - Wikipedia

    en.wikipedia.org/wiki/Current_clamp

    Several jaw sizes are available for clamping around large conductors and bus bars up to 4 + 1 ⁄ 2 inches (110 mm) wide. [4] As the illustration shows, the scale is very non-linear and unsuitable for measuring low currents, with currents of less than half the full-scale deflection crammed into a short section of the dial.

  4. Electronic test equipment - Wikipedia

    en.wikipedia.org/wiki/Electronic_test_equipment

    Electronic test equipment is used to create signals and capture responses from electronic devices under test (DUTs). In this way, the proper operation of the DUT can be proven or faults in the device can be traced. Use of electronic test equipment is essential to any serious work on electronics systems.

  5. Instrumentation - Wikipedia

    en.wikipedia.org/wiki/Instrumentation

    Transistor electronics enabled wiring to replace pipes, initially with a range of 20 to 100mA at up to 90V for loop powered devices, reducing to 4 to 20mA at 12 to 24V in more modern systems. A transmitter is a device that produces an output signal, often in the form of a 420 mA electrical current signal, although many other options using ...

  6. Hitachi HD44780 LCD controller - Wikipedia

    en.wikipedia.org/wiki/Hitachi_HD44780_LCD_controller

    A 20×4-character display. In 8-bit mode, all transfers happen in one cycle of the enable pin (E) with all 8 bits on the data bus and the RS and R/ W pins stable. In 4-bit mode, data are transferred as pairs of 4-bit "nibbles" on the upper data pins, D7–D4, with two enable pulses and the RS and R/ W pins stable. The four most significant bits ...

  7. Teradyne - Wikipedia

    en.wikipedia.org/wiki/Teradyne

    In the 1980s, Teradyne expanded its sub-assembly test business by acquiring Zehntel, a leading manufacturer of in-circuit board test systems. In 1987, the company introduced the first analog VLSI test system, the A500, which led the market in testing integrated devices that provided the interface between analog and digital data .

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