Cầu đo điện trở 1 chiều, máy đo điện trở tiêp xúc Seaward DO4002 Digital Micro-Ohmmeter
| Seaward DO4002 Specification | ||||
| Measurement: | 4 Terminal Kelvin / Thomson principle eliminates errors due to lead resistance. | |||
| Display: | 15mm LCD 4000 count with automatic decimal point and polarity indication | |||
| Ranges: | 6 automatic or manual selection with LED indication | |||
| Terminals: | 4mm safety sockets | |||
| Working temperature: | 0°C to +45°C rel. humidity 80% max. non-condensing | |||
| Storage Temperature: | -20°C to +60°C | |||
| Safety: | EN 61010-1 EMC - EN 61236 | |||
| Dimensions: | 215mm x 130mm x 55mm (W H D) approx 467mm x 374mm x 216mm packed in carton | |||
| Mass: | 0.8kg approx | |||
| Zero: | Button to null measurement offsets | |||
| Protection: | 415 Vrms maximum at the measuring terminals will blow internal protection fuse | |||
| Calibration: | Digital pass code protected | |||
| Battery: | Removable pack with 5 1.5V non-rechargeable batteries. Separate rechargeable pack, charger and docking station as optional extras | |||
| Resistance Measurement: | ||||
| Range | Resolution | Typical Current | Accuracy @ 20°C ±5°C 1 year | Temperature Coefficient/°C |
| 4k Ω | 1 Ω | 100µA | ±(0.05% Rdg +0.02% FS) | 30ppm Rdg + 1ppm FS |
| 400 Ω | 100m Ω | 1mA | ± (0.05% Rdg +0.02% FS) | 30ppm Rdg + 1ppm FS |
| 40 Ω | 10m Ω | 10mA | ± (0.05% Rdg +0.02% FS) | 30ppm Rdg + 1ppm FS |
| 4 Ω | 1m Ω | 10mA | ± (0.05% Rdg +0.03% FS) | 30ppm Rdg + 4ppm FS |
| 400m Ω | 100µ Ω | 10mA | ± (0.05% Rdg +0.05% FS) | 30ppm Rdg + 25ppm FS |
| 40m Ω | 10µ Ω | 100mA | ± (0.05% Rdg +0.1% FS) | 30ppm Rdg + 25ppm FS |
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