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High Accuracy DC Resistance Wheatstone Bridge Single Bridge DC Resistance Measurement（Wheatstone Bridge）
INTRODUCTION
MEWOI-QJ23E portable Wheatstone bridge is equipped with a built in galvanometer and batteries, designed for the measurement of resistance over the range of 1 ohm to 1110000ohms, All parts are mounted in an aluminum case And the instrument can be carried with ease. All the resistance elements are of well-aged manganin wire with low temperature coefficient and non-inductively wound, sharing a high stability & accuracy. The type V switches used in the instrument enjoy a long operating life. The contact elements are light stable, and good-repeatability. |
MAIN FEATURES
1, MEWOI-QJ23E is a portable two terminal DC bridge. The control range is 0 ~ 110m Ω, which is divided into seven ranges, and the accuracy is grade 01,It is suitable for measuring various DC resistance in laboratory, workshop and field without AC power supply |
2, The P Ⅲ high-strength plastic shell made of T300 polypropylene resin which has the advantages of beautiful appearance, corrosion resistance and corrosion resistance, Good extrusion performance, especially suitable for field use |
3, The bridge adopts jz8 high-performance electronic amplification zero pointing instrument, which is only set with mechanical zero adjustment without electrical zero adjustment, and has the function of automatically cutting off the power supply. The zero indicator has the characteristics of high sensitivity, good reliability and strong overload resistance. It is as simple to use as the tension wire galvanometer. |
4, The resistance element used in the bridge adopts low temperature coefficient manganese copper wire, which is wound on the porcelain tube in a non inductive way, and is subject to strict process treatment and long-term manual experience, so the resistance element has high accuracy and good stability |
SPECIFICATION
2.1 Measurement range: 0~11.110MΩ 2.2 Accuracy and measurement condition(See Table 1) 2.3 Environmental Parameters a. Temperature: Reference value: 20士0.5℃, nominal value: 15℃~25℃. b. Relative humidity: Reference value: 40%~60%, nominal value:25%~75%. 2.4, Built-zero indicator a. Sensitivity when the measuring plate deflects a grading index, the pointer of zero setting will at least deflect 2 graduations b. Dumping time∶ Not over 4seoonds 2.5, Dry cells(built-in): The 3pieces of 1.5V(R20) dry cells and the 2pieces of 9V(6F22) dry cells. 2.6, Dimensions:310*280*160mm |
Table 1
Multiple | Effective range | Resolution | Class index | Reference Value(Rn) | Power Supply |
×10-3 | 0～11.11Ω | 1mΩ | 0.5% | 10Ω | 4.5V(INT OR EXT) |
×10-2 | 0～111.10Ω | 10mΩ | 0.2% | 100Ω | |
×10-1 | 0～1.1110kΩ | 100mΩ | 0.1% | 1kΩ | |
×1 | 0～1.11110kΩ | 1Ω | 0.1% | 10kΩ | |
×10 | 0～111.10Ω | 10Ω | 0.2% | 100kΩ | |
×102 | 0～1.1110MΩ | 100Ω | 0.2% | 1MΩ | 9V EXT |
×103 | 5～11.110MΩ | 1KΩ | 0.5% | 10MΩ |
