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| multimeter |
One of the most useful equipment for an electrician is the multimeter.
The name "Multimeter" shows that are many instruments together in the same case.
In this photo we have:
1. Voltmeter to measure voltage in volts ac and dc to dial numbers in black-choice and switch ac - dc in proper position. Measured by the voltage present in the test circuit in parallel connection.
2. Ohmmeter and diode controller to measure resistance in ohms and voltage threshold in volts for the diode in green numbers. Measuring without voltage in the concerned circuit.
3. Frequency meter to measure frequency in Hz in white numbers. In a parallel connection.
4. Ammeter to measure current in amperes in orange numbers. Measuring under voltage connected in series in the cable that we want to measure the amps.
5. Capacitance meter to measure capacity in farad at the blue numbers. No voltage. The ends of the capacitor goes into the slots with the symbol of the capacitor. If the capacitor is electrolytic correct in the write polarity.
The black connector is permanently attached to the connector COM (From the word common). The red probe goes into the slot with the same color you choose on the rotary knob.
In position control knob channels there is also the function of "pager", in which between terminals if the resistance is less than 20 ohms the buzzer sounds
In all options the rotary switch knob shows the number of the maximum value that can measure the multimeter. E.g. position 2 volt for up to two volt, if the voltage is greater displayed is displaying 1 with a dot (1.) to notify us that the voltage is greater than 2 volts and choose the next larger scale. It is best to start for an unknown expected value measure from the widest possible choice (p, e.g. for voltage 600 volts) and descending scale if needed, so we achieve the greatest possible accuracy.
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