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Last Updated
03/31/2019
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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION. |
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AMMETER x MILLIAMMETER xx ELECTRONIC TESTING xx METER (ELECTRONIC) xx VOLTMETER & MULTIMETER How voltmeters, ammeters and other meters work. Linear AC measurements using a "diode". Using a synchronous rectifier circuit to measure AC voltage and current with DC meters. Meter shunts and how to make them. Build a "snap on" RF current probe (meter) to check the operation of radial antennas. Convert milliammeter to measure voltage or higher currents. Build a novel LCD ammeter (100 to 400 milliamperes) and RF power meter (an indicating 50-ohm RF dummy-load wattmeter) incorporating the "Duracell" battery testing strips (a thin-film resistor combined with a liquid-crystal bargraph display). Method for determining the correct resistance for a meter shunt. Using the 7107 integrated circuit chip. It is a combination analog-to-digital converter, reference voltage, timing clock, and decoder/driver circuit for 7-segment LED displays. Circuits shown for a digital voltmeter, DC current meter, resistance meter, capacitance meter, frequency meter, etc. Make your own shunts for measuring current using a multimeter. Explanation and use of meters. Volt, Ohm, Milliammeters, Meggars, and Galvanometers. Multi-range milliammeter is provided with an easy access fuse so that it can be easily changed to one specifically rated for the circuit under test. Basic course in electricity and electronics. How to measure electricity. Different types of meters and how to use them to measure voltage and current. Build a large-scale operating moving coil meter to learn how they work. Convert a DC milliammeter to read higher values of current by adding a shunt. Solar-cell tester. Measures both the voltage and amperage output under a variable load. Meter demonstrator for classroom use can illustrate the function of a voltmeter or an ammeter. Tips on calibrating ammeters, ohmmeters, wattmeters, etc. 100,000-megohm-input meter indicates static electricity. Ultrasensitive electrometer-type voltage/current meter (picoammeter) expands your measurement world to one-trillionth of an ampere and a trillion ohms. Est. cost: $38. High-current shunt for DMMs (digital multimeters) extends current-measuring capability beyond the usual 10 amperes. Variable shunt increases the range of a milliammeter up to five times. Modify a milliammeter to be a microammeter with this circuit. AC ammeter measures up to five amperes. Est. cost: $3. Surplus D'Arsonval movement meters are easily converted to special-purpose voltmeters and ammeters. Printed circuit board tester which uses an op amp can determine the presence of current flow in a printed circuit board without breaking the foil trace. It gives an estimate of the amount of current. How to modify a basic 1-mA movement to measure currents from milliamperes to hundreds of amperes. Precision references for current and voltage are used to check the accuracy of test instruments. Low-cost op-amp system can measure weak direct currents such as solar-cell output. Measures from 0 to 50 microamps. Estimated cost: $15. Measuring large currents with a DMM. Use a high-current shunt to measure tens or hundreds of amperes. How to make the shunt. Current-detection circuits. (1) High-gain current sensor can be used to detect the presence of low-level current circulating through a printed-circuit board's copper traces. (2) Inductive current sensor is designed to seek out AC current flow in electrical wiring and electronic circuitry. Meter-range extender circuits that increase the sensitivity of an analog current meter. (1) Amplified DC microammeter. (2) Low-voltage voltmeter. (3) Meter-calibration circuit. (4) Low-range ohmmeter. All about meters. What you need to know to design ammeters, voltmeters, and ohmmeters. Simple transistor circuit, configured as an RF oscillator, is used to detect changes in DC current flow. A modification allows linear responses to relatively small current changes. Increase the range of an ammeter with this simple add-on. Using digital panel meters to enhance the look and performance of your next project. Circuits include: (1) AC power supply, (2) DC-to-DC supply, (3) DC ammeter, (4) automobile voltage monitor, (5) digital DC voltmeter, and (6) low-ohms meter. Build an AC amp meter (ammeter). Automobile electrical system tester plugs into your car lighter socket. This meter supplies all the information of an ammeter while your car is operating. Est. cost: $10. Nine-in-one troubleshooter does the work of nine individual test meters by means of one universal meter coupled with six interchangeable test modules. Part 3. Storage battery cell tester and AC ammeter. Electrical appliance tester you can build. Check for shorts, continuity, current leakage and measure current draw. How to use split-core ammeters to test home appliances. Servo current monitor. This electronic circuit is inserted between the output from a radio control receiver and a servo. The amount of current drawn is displayed on an LED bargraph. How to modify the full-scale reading of an existing voltmeter or ammeter. How to use digital panel meters to measure voltage, current, resistance, capacitance, frequency, temperature, etc. Part 1. Voltage, current and resistance meters. Build this clamp-on DC ammeter. This ammeter uses Hall-effect transducers to let you measure DC current using a clamp-on probe. Circuit for a low-current ammeter uses the new OP-41 op-amp from Precision Monolithics Inc. Op-amps show their versatility in instrumentation circuits. Includes circuits for rectifier, peak detector, AC/DC converter, voltmeter, ammeter, ohmmeter, voltage reference, and power supply. Tips on accurately sensing or measuring an electrical current. AC ammeter with three ranges: 0-50 ma, 0-500 ma, 0-5 amps. Includes male and female AC sockets. Est. cost: $14. Build a hot-wire ammeter which will measure up to two amperes. An iron vane ammeter will indicate from 0 to 1 ampere, AC or DC. A simple project built of wood, wire and a tin can. A large-size hot wire ammeter. Moving vane ammeter works on AC and DC indicates 0 to 1 ampere. Build an electrostatic microammeter capable of measuring current from 25 millionths of an ampere to 5 billionths of an ampere in circuits that carry potential of up to 500,000 volts. The Model A Ford ammeter. Understanding the role of an ammeter in the electrical system of an automobile. How to read and interpret what an ammeter is telling you. Checking your airplane's ammeter. Includes construction of a meter movement calibration test set. | |||||||||
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