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发表于 2023-9-28 08:40:45
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应该说的是CAT等级吧。严格来说1000V以下都算低压,CAT等级高并且没有虚标的表,和等级低或者虚标的表,最直接就是特殊情况下会不会炸在手里。
EEVBLOG有视频,国内翻译:
【EEVblog #84 - 炸掉你的万用表】 https://www.bilibili.com/video/B ... are_source=copy_web
[color=var(--text-color)]CAT I | Electronic Devices
| Anything from a small circuit board to larger device with high-voltage but low-energy
| CAT II
| Single-Phase AC Loads
| Appliances or portable tools | CAT III
| Three-Phase Distribution
| Some large building lighting systems and polyphase motors | CAT IV
| Three-Phase Utility Connections or Outdoor Conductors
| Electrical meters, outdoor connections, any low-voltage and high-energy connection |
Measurement Category | Working Voltage | Transient Voltage | Test Source (Impedance) | Working Current | Transient Current | CAT I | 150V | 800V | 30 Ohms | 5A | 26.6A | CAT I | 300V | 1500V | 30 Ohms | 10A | 50A | CAT I | 600V | 2500V | 30 Ohms | 20A | 83.3A | CAT I | 1000V | 4000V | 30 Ohms | 33.3A | 133.3A | CAT II | 150V | 1500V | 12 Ohms | 12.5A | 125A | CAT II | 300V | 2500V | 12 Ohms | 25A | 208.3A | CAT II | 600V | 4000V | 12 Ohms | 50A | 333.3A | CAT II | 1000V | 6000V | 12 Ohms | 83.3A | 500A | CAT III | 150V | 2500V | 2 Ohms | 75A | 1250A | CAT III | 300V | 4000V | 2 Ohms | 150A | 2000A | CAT III | 600V | 6000V | 2 Ohms | 300A | 3000A | CAT III | 1000V | 8000V | 2 Ohms | 500A | 4000A | CAT IV | 150V | 4000V | 2 Ohms | 75A | 2000A | CAT IV | 300V | 6000V | 2 Ohms | 150A | 3000A | CAT IV | 600V | 8000V | 2 Ohms | 300A | 4000A | CAT IV | 1000V | 12000V | 2 Ohms | 500A | 6000A |
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