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Tư vấn kỹ thuật
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Đồng hồ vạn năng Extech EX450 ( đo nhiệt độ hồng ngoại 270 độ C)
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Đồng hồ vạn năng Extech EX450
Hãng sản xuất : Extech
Model: EX450
Xuất xứ : Taiwan
Thông số kỹ thuật:
| Input Protection Limits | |
| V | DC or V AC 600V DC/AC, 200Vrms on 200mV range |
| mA | AC/DC 200mA 250V fast acting fuse |
| A | AC/DC 20A 250V fast acting fuse(30 seconds max every 15 minutes) |
| Resistance, Diode Test, Continuity | 250Vrms for 15sec max |
| General | |
| Diode Test | Test current of 0.3mA maximum, open circuit voltage 1.5V DC typical |
| Continuity Check | Audible signal will sound if the resistance is less than 150Ω (approx.), test current <0.7mA |
| IR Spectral response | 6 to 16μm |
| IR Emissivity | 0.95 fixed |
| IR distance | ratio 8:1 |
| Input Impedance | >7.5M Ω (VDC & VAC) |
| AC Response | Average responding |
| ACV Bandwidth | 50Hz to 1kHz |
| Display | 2000 count backlit liquid crystal |
| Overrange indication | “OL” is displayed |
| Auto Power Off | 15 minutes (approximately) |
| Polarity | Automatic (no indication for positive); Minus (-) sign for negative |
| Measurement Rate | 2 times per second, nominal |
| Low Battery Indication | “ ” is displayed if battery voltage drops below operating voltage |
| Battery | One 9 volt (NEDA 1604) battery |
| Fuses | mA, μA ranges; 0.2A/250V fast blow A range; 20A/250V ceramic fast blow |
| Operating Temperature | 41°F to 104°F (5°C to 40°C) |
| Storage Temperature | -4°F to 140°F (-20°C to 60°C) |
| Operating Humidity | Max 80% up to 87°F (31º°C) decreasing linearly to 50% at 104°F(40°C) |
| Storage Humidity | <80% |
| Operating Altitude | 7000ft. (2000meters) maximum. |
| Weight | 0.753lb (342g) (includes holster). |
| Size | 7.36” x 3.2” x 2.0” (187 x 81 x 50mm) (includes holster) |
| Safety | For indoor use and in accordance with the requirements for double insulation to IEC1010-1 (1995), EN61010-1 (1995) Overvoltage Category III, Pollution Degree 2. |
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