Κοινή ψηφιακή πολύμετρο παρανοήσεις
Digital multimeters are popular among radio enthusiasts due to their advantages of accurate measurement, convenient value taking, and complete functions. The most common digital square meters generally have resistance measurement, on-off sound detection, and diode forward conduction voltage measurement. AC/DC voltage and current measurement, transistor amplification factor and performance measurement, etc. Some digital multimeters have added functions such as capacitance measurement, frequency measurement, temperature measurement, data memory, and voice reporting, which bring great convenience to practical testing work. However, improper use of digital meters can easily cause damage to the components inside the meter and result in malfunctions during actual testing. Based on the actual situation that caused damage to the digital multimeter, I have summarized the precautions for using a digital multimeter for beginners to refer to, in order to prevent damage to the digital multimeter as much as possible.
Some digital multimeters are damaged due to the measured voltage and current exceeding the range. If measuring the mains power in the 20V range, it is easy to cause damage to the AC amplifier circuit of the digital multimeter, causing the multimeter to lose its AC measurement function. When measuring DC voltage, if the measured voltage exceeds the measurement range, it can also easily cause circuit faults in the meter. When measuring current, if the actual current value exceeds the range, it usually only causes the fuse in the multimeter to burn out and will not cause any other damage. So when measuring voltage parameters, if you don't know the approximate range of the measured voltage, you should first set the measurement gear to the highest gear, measure its value, and then shift gears to obtain more accurate values. If the voltage value to be measured far exceeds the maximum range that the multimeter can measure, a high resistance measuring probe should be provided separately.
Σε περισσότερες περιπτώσεις, ζημιά σε α ψηφιακό πολύμετρο είναι προκαλείται από μέτρηση ταχύτητα σφάλματα. Για παράδειγμα, πότε μέτρηση AC ισχύς, if the μέτρηση γρανάζι είναι set to the resistance gear, once the probe contacts the power, it can instantly cause damage to the internal components of the multimeter. Επομένως, before using a multimeter for measurement, it is necessary to check if the measurement gear is correct. After use, place the measurement selection at AC 750V or DC 1000V, so that no matter what parameter is mistakenly measured in the next measurement, it will not cause damage to the digital multimeter.
Το DC τάση ανώτερο όριο εύρος από α ψηφιακό πολύμετρο is 1000V, so when measuring DC voltage, the highest voltage value is below 1000V, which general does not damage the multimeter. If it exceed 1000V, it is highly likely to cause damage to the multimeter. Ωστόσο, the upper limit of measurable voltage may vary among different digital multimeters. If the measured voltage exceed the range, the method of resistance τάση μείωση μπορεί να είναι χρησιμοποιείται για μέτρηση. In προσθήκη% 2c όταν μέτρηση υψηλή DC τάσεις διακύμανση από 40O έως 1000V % 2c ο ανιχνευτής πρέπει να είναι καλό επαφή με το μέτρηση σημείο και εκεί πρέπει να είναι όχι ανακίνηση. Διαφορετικά% 2c in προσθήκη έως πρόκληση ζημιά στο το πολύμετρο και ανακριβείς μετρήσεις , in σοβαρές περιπτώσεις % 2c το πολύμετρο μπορεί επίσης έχουν όχι οθόνη.
