Who is important between digital multimeter and analog multimeter
The multimeter is without a doubt the electronic measurement tool that electricians use the most frequently, but deciding between a digital multimeter and an analog (pointer) multimeter can be difficult. for use with analog multimeters, despite claims to the contrary made by some. Many experienced, older electricians are still more accustomed to it. What distinguishes an analog multimeter from a digital multimeter? Which one should you use?
The reading display is the primary distinction between a digital multimeter and an analog multimeter. The high resolution liquid crystal display used in the digital multimeter can virtually eliminate parallax when reading data. The reading is convenient and precise, relative speaking. The analog multimeter is unmatched in this regard, but it also has some special advantages of its own, such as the ability to reflect the property changes of the measured object extremely intuitively through the instantaneous deflection of the pointer.
The intermittent measurements and displays of the digital multimeter make it difficult to track the measured electric quantity's ongoing changing process and change trend. Digital multimeters, for instance, are less practical and user-friendly than analog multimeters when it comes to examining the way capacitors charge, the way resistor resistance changes with temperature, and the way photoresistor resistance changes with light.
The analog multimeter and the digital multimeter operate on distinct principles. The meter head, a resistor, and a battery make up the analog multimeter's internal components. Typically, a magnetoelectric DC microammeter is used as the meter head. Use the battery inside only while measuring resistance. The black test lead is linked to the battery's positive pole, which causes electricity to flow out of the black test lead and into the red test lead. Switching gears will shunt the current while measuring DC current by connecting parallel resistors. The meter head's very low full-bias current necessitates the use of shunt resistors to increase the range.When measuring DC voltage, series-connect resistors to the meter head and use different extra resistors to achieve range conversion.
An LCD display (liquid crystal display), an A/D converter, a function/range conversion switch, and a power supply make up a digital multimeter. The A/D converter often uses the ICL7106 dual-integral A/D converter. The ICL7106 performs two integrations: the sampling process is the first integration of the analog input signal V1, and the comparison process is the second integration of VEF, the reference voltage. The binary counter counts the two integration processes, converts the results into digital quantities, and displays the results digitally. A comparable converter must be added to transform the measured electricity into a DC voltage signal in order to evaluate electrical characteristics such AC voltage, current, resistance, capacitance, diode forward voltage drop, and transistor amplification factor.
The digital red test lead is attached to the positive pole of the battery, the black test lead is connected to the negative pole, and the analog multimeter is exactly the opposite. The polarity of the battery connected inside the digital multimeter and the pointer multimeter is different. While the pointer type is exactly the opposite, the diode measured by the digital meter is exactly in line with the real polarity of the diode.
Analog multimeters in use have mechanical knobs or adjustment screws for adjusting the zero point. You must use your fingers or a screwdriver if the hands are not pointing in the mechanical zero position, which is the infinity of the ohm scale and the zero point of the voltage scale. To get rid of zero point errors, slowly crank the mechanical zero point adjustment mechanism to reset the watch hands to zero. The automatic zero return feature on the digital multimeter is more practical.
In addition, many digital multimeters now include a variety of function gears compared to the pointer multimeter, including capacitance, frequency, temperature, triode measuring gear, etc. There have also been some advancements in sensitivity, accuracy, and overload capacity. Although digital multimeters generally offer advantages over analog multimeters, they cannot totally replace them. Different measurement scenarios still have benefits and drawbacks, so you must make your decision based on your real measurement requirements.
