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詳細介紹
The DO4002 digital microhmmeter offers true portability without any sacrifice to accuracy or functionality. This micro ohmmeter is a ruggedly constructed instrument is housed in a stylish plastic case with easy to use keyboard. The measured values are displayed on a large LCD screen which allows for ease of viewing. Automatic or manual range selection is available and many advanced features are included.
Cropico DO4002
Technical specification
| Measurement | 4 Terminal Kelvin/Thomson principle eliminates error due to lead resistance. Open circuit measurement voltage approx. 5V dc. |
| Display | 15mm LCD 4,000 count with automatic decimal point and polarity indication |
| Ranges | 6 Ranges with automatic or manual selection |
| Auto Zero | Permits the automatic zero of amplifiers and external circuits eliminating errors due to thermal emf. |
| Calibration | Digital |
| Protection | 415 rms maximum at input terminals |
| Battery | 5 AA size manganese Alkaline supplied with unit. Rechargeable battery pack option includes 5 AA size Ni/Mhd, housed in removable cassette plus docking station and charger. Automatic Power OFF ensures maximum battery life |
| Temperature Compensation | The model 4002 also includes temperature compensation which references the measurement to an ambient temperature of 20 Deg.C. Coefficients for copper and aluminium are pre programmed and a user coefficient facility enables coefficients for any material to be entered. |
| Temperature Measurement | The Model 4002 also include temperature measurement over the range -50...+800 Deg C. Using a Pt100 temperature probe which may be ordered as an option. |
| Terminals | 4mm safety sockets |
| Working Temperature | 0...40°C rel. humidity 80% max. non-condensing |
| Storage Temperature | -20 ... +50°C. |
| Charger Mains Supply | 100/120/220/240 Volts +10% -13%. 47 ... 63Hz. 20VA |
| Safety | EN61010-1 EMC - EN61326 |
| Dimensions | 215 x 130 x55mm （W H D） |
| Weight | 0.8kg |
| Accessories | Supplied complete batteries, measuring leads with Kelvin Clips, handbook, and calibration certificate |
Resistance ranges
| Range | Resolution | Typical Current | Uncertainly @ 20°C ±5°C, 1 year | Temperature Coefficient / °C |
| 400ohm | 100 mohm | 1mA | ±（0.05% Rdg + 0.02% FS） | 30 ppm Rdg + 1 ppm FS |
| 40ohm | 10 mohm | 1mA | ±（0.05% Rdg + 0.02% FS） | 30 ppm Rdg + 1 ppm FS |
| 4ohm | 1 mohm | 100 mA | ±（0.05% Rdg + 0.02% FS） | 30 ppm Rdg + 1 ppm FS |
| 400mohm | 100 µohm | 1A | ±（0.05% Rdg + 0.03% FS） | 30 ppm Rdg + 4 ppm FS |
| 40mohm | 10 µohm | 1A | ±（0.05% Rdg + 0.05% FS） | 30 ppm Rdg + 25 ppm FS |
| 4mohm | 1 µohm | 1A | ±（0.05% Rdg + 0.01% FS） | 30 ppm Rdg + 25 ppm FS |