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  2. Multimeter - Wikipedia

    en.wikipedia.org/wiki/Multimeter

    Thus a meter with a 50 μA movement will have a "sensitivity" of 20,000 Ω/V. "Per volt" refers to the fact that the impedance the meter presents to the circuit under test will be 20,000 Ω multiplied by the full-scale voltage to which the meter is set. For example, if the meter is set to a range of 300 V full scale, the meter's impedance will ...

  3. Electrical isolation test - Wikipedia

    en.wikipedia.org/wiki/Electrical_isolation_test

    Isolation resistance measurements may be achieved using a high input impedance ohmmeter, digital multimeter (DMM) or current-limited Hipot test instrument. The selected equipment should not over-stress sensitive electronic components comprising the subsystem.

  4. List of projects published in Radio-Electronics magazine

    en.wikipedia.org/wiki/List_of_projects_published...

    This concluding part describes how to recover the video and audio signals from the satellite signal and then display them on your TV set. Robert B. Cooper, Jr. 51/4 April 1980 Portable electronic organ [4] Learn to play a keyboard instrument on either one of the two inexpensive organs described. One plays melody, the other plays melody and chords.

  5. High impedance - Wikipedia

    en.wikipedia.org/wiki/High_impedance

    In analog circuits a high impedance node is one that does not have any low impedance paths to any other nodes in the frequency range being considered.Since the terms low and high depend on context to some extent, it is possible in principle for some high impedance nodes to be described as low impedance in one context, and high impedance in another; so the node (perhaps a signal source or ...

  6. Ammeter - Wikipedia

    en.wikipedia.org/wiki/Ammeter

    An ammeter (abbreviation of ampere meter) is an instrument used to measure the current in a circuit. Electric currents are measured in amperes (A), hence the name. For direct measurement, the ammeter is connected in series with the circuit in which the current is to be measured.

  7. Ohmmeter - Wikipedia

    en.wikipedia.org/wiki/Ohmmeter

    First, the meter needs to be zeroed by shorting the measurement points together and performing an adjustment for zero ohms indication prior to each measurement. This is because as the battery voltage decreases with age, the series resistance in the meter needs to be reduced to maintain the zero indication at full deflection.

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    mail.aol.com

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  9. Voltmeter - Wikipedia

    en.wikipedia.org/wiki/Voltmeter

    For example, a meter with a sensitivity of 1000 ohms per volt would draw 1 milliampere at full scale voltage; if the full scale was 200 volts, the resistance at the instrument's terminals would be 200 000 ohms and at full scale, the meter would draw 1 milliampere from the circuit under test. For multi-range instruments, the input resistance ...