How to read an analog multimeter: operation guide combined with hot topics
Analog multimeters (analog multimeters) are commonly used tools in electronic measurements. Although digital multimeters are gradually becoming more popular, analog meters are still widely used in specific scenarios because of their intuitiveness and reliability. This article will combine the hot topics on the Internet in the past 10 days to analyze in detail how to use the pointer multimeter, and attach structured data for reference.
1. Basic operating steps of pointer multimeter
1.Range selection: Select the appropriate gear according to the measured physical quantity (voltage, current, resistance) to avoid over-range damage to the instrument.
2.Zero calibration: Before measuring resistance, you need to short-circuit the test leads and adjust the "zero ohm knob" so that the pointer points to the 0 mark on the right.
3.Reading method: Pay attention to the scale lines corresponding to different ranges. For example, AC/DC voltage shares a black scale, and resistance reads a green scale.
| Measurement items | gear selection | tick marks | unit |
|---|---|---|---|
| DC voltage | DCV (such as 10V, 50V gear) | Black scale (0-10) | V |
| AC voltage | ACV (such as 250V gear) | Red scale (0-250) | V |
| resistance | Ω (×1k level) | Green scale (right → left) | Ω |
2. Applications related to recent hot topics
1.New energy vehicle maintenance(Search volume in the past 7 days +35%): The pointer meter can quickly determine the status of the 12V battery. Select the DCV 20V range when measuring. The normal voltage should be ≥12.6V.
2.Household circuit troubleshooting(TikTok-related videos have been played more than 5 million times): Use the ACV 250V level to detect the socket voltage. If the pointer shakes violently, it may indicate poor contact.
3.Electronics DIY boom(Related tutorials at Station B increase by 120% every week): Use the Ω×1 gear to test the LED polarity. When forward conduction, the pointer deflects about 15kΩ.
| Hot scenes | Recommended gear | Typical readings | Fault diagnosis |
|---|---|---|---|
| Electric vehicle charger detection | DCV 200V | 54-58V (48V charger) | The pointer is unstable → the capacitor is aging |
| Old socket detection | ACV 500V | 210-230V | <180V→virtual line connection |
| Lithium battery health | Ω×10k | ∞ (full state) | There is resistance → battery leakage |
3. Top 3 high-frequency problems in using pointer tables
1.What should I do if the pointer is reversed?: Stop the measurement immediately and check whether the polarity of the test leads is reversed (the red test lead should be connected to the positive pole when measuring DC).
2.How to solve blurry readings?: It may be due to the reflection of the mirror scale. Adjust the viewing angle so that the pointer coincides with the image in the mirror and then read.
3.How to calibrate if the measurement is inaccurate?: Most instruments have a calibration potentiometer at the bottom, which needs to be adjusted with a standard voltage source.
4. Comparative advantages with digital multimeters
| Comparative item | pointer multimeter | digital multimeter |
|---|---|---|
| Response speed | Visually display trend changes | Need to wait for the numbers to stabilize |
| Capacitance detection | Observe charging and discharging through pointer swing | Requires special capacitor file |
| Immunity to interference | More reliable in strong electromagnetic environment | Vulnerable to interference hops |
5. Safety precautions
• When measuring high voltage, you need to maintain the habit of using one hand to avoid electric shock due to circuit formation.
• Recalibrate the resistance level after replacing the battery (the recent battery leakage incident of a certain brand caused an error of +12%)
• When not in use for a long time, turn the gear to "OFF" or the highest voltage level.
combined with current#electronicsrepairhotand#retrotechtideAnd other topics, mastering the skills of analog multimeter can not only cope with daily needs, but also is an essential ability for professional and technical personnel. It is recommended to save the comparison table in the article for quick reference.
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