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31
May
2017
Protection Circuit Of Digital Multimeter
1. Automatic recovery protection. Some watch circuitry, when an overload is detected, protects the watch until the condition no longer exists. After the overload is removed, the...
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19
May
2017
Causes Of Damage To Digital Multimeters
1. When the probe is still in the current jack, use it to measure the AC voltage 2. In resistance mode, measure the AC power 3. Withstand too high transients 4. Exceeding the ma...
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09
May
2017
Certification Tests For Digital Multimeters
To use the multimeter safely, you must first select a digital multimeter that is suitable for the application and meets the application environment. Once you have selected the a...
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27
Apr
2017
Safety Certification For Digital Multimeters
When you see symbols like UL, CSA, TUV, etc. or read phrases like "Designed to Satisfy...", independent testing and certification bodies tend to come to mind. Of cours...
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08
Apr
2017
Current Testing Of Digital Multimeters
Sometimes, the current value you want to measure exceeds the range of the digital multimeter or the field conditions do not allow you to open the circuit to measure the current....
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22
Mar
2017
Input Protection Of Digital Multimeters
A common mistake is to put the test leads in the current jacks while trying to test the voltage. Small value resistors in DMMs can short-circuit the voltage source. A large curr...
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06
Mar
2017
How A Digital Multimeter Measures Current
Current measurement is not the same as measuring other quantities with a DMM. The direct current measurement method is to connect the digital multimeter directly to the circuit ...
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24
Feb
2017
Diode Test For Digital Multimeters
A diode is like an electronic switch. If the voltage is above a certain value, the diode will conduct. Typically a silicon diode turn-on voltage is 0.6V. And diodes only allow c...
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25
Jan
2017
On-off Measurement Of Digital Multimeter
Continuity is the distinction between a circuit or a short by a quick resistance measurement. On-off measurement is simpler and faster with a DMM with on-off beep. When a short ...
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06
Jan
2017
Measuring Resistance With A Digital Multimeter
Resistance is measured at the electrical barrier. Resistance values vary widely, from a few milliohms (mΩ) for contact resistance to billions of ohms for insulation resistance. ...
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20
Dec
2016
Measurement Accuracy Of Digital Multimeter
Accuracy refers to the maximum allowable error in a specific use environment. In other words, precision is used to indicate How close the DMM's measurement is to the actual ...
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15
Dec
2016
Resolution Of A Digital Multimeter
Resolution is to judge the quality of the measurement results of a watch. Knowing the resolution of a meter lets you know if you can see small changes in the signal being measur...
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08
Dec
2016
What Is A Digital Multimeter
Digital multimeter, a multi-purpose electronic measuring instrument, generally includes functions such as ammeter, voltmeter, ohmmeter, etc., sometimes also called multimeter, m...
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01
Dec
2016
Digital Analog Display Of Digital Multimeter
In terms of accuracy and resolution, digital displays have great advantages, and measurements can be displayed with three or more digits. Analog pointers are slightly inferior i...