Multimeter or Avometer is an electric measuring device that can be used to measure voltage (voltmeter), resistance (ohmmeter) and electric current (ammeters). As explained in the previous article, there are 2 types of multimeter or avometer, namely digital and analog. The difference is that for analog, the meter indicator uses a needle, while the digital one uses the numbers indicated by a led light. The image below shows the difference between a digital and analog multimeter or avometer:
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Analog Multimeter Digital Multimeter
The parts of the multimeter or avometer are as follows:
Step Switch
This section is used to select the type of quantity to be measured by the measurement range.
ZERO Control Screw
Before taking the measurement, the needle must indicate exactly ZERO, otherwise the control screw ZERO must be reset.
ZERO button
For each resistance measurement, the ZERO button must be adjusted so that the needle points exactly to ZERO.
Investigator Cables
The RED cable is attached to the Plus hole and the BLACK cable is attached to the MINUS or COMMON hole.
In using this tool, it is necessary to always pay attention to the selection of the right steps. The wrong line selection will cause damage to the avometer, for example measuring the voltage with a step on the OHM, then the consequences will be fatal. If the measured quantity cannot be estimated in advance, it must be accustomed to choosing the highest range. After each measurement, get accustomed to putting the step in the OFF or VDC position for the highest score.
Below is a schematic image of the following analog multimeter with a description of each item on the multimeter, which is as follows:
- Scale board
- Scale needle
- Needle scale control
- Zero ohm adjustment knob
- Limit measuring ohm meter
- Limit measuring DC volts (DCV)
- Limit measuring AC volts (ACV)
- The limit for measuring the DC ampere meter
- Selector switch (DCV, ACV, Ohm, DC ampere)
- Positive pin test (+)
- Negative pin test (-)
This is a brief explanation of the multimeter or avometer. The next article I will try to explain about how to use this tool. Hopefully this is useful and can provide an understanding for you, especially about your electronic science or engineering.