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MEWOI-QJ57P High Accuracy DC resistance Dual Bridge(Kelvin Bridge)
INTRODUCTION
MEWOI-QJ 57P is a portable high accuracy DC double bridge with Kelvin network (hereinafter referred to as “Bridge"). The instrument is provided with seven measure ranges from 0~ 1.1111kΩ and the minimum resolution is 0.01µΩ. it is suitable for high accuracy measurement of low-value resistance or DC resistance in the conductivity of metal conductor，DC current divider, the contact resistance of switch，wire and cable, motors and transformers, etc. |
MAIN FEATURES
| The main resistance element of the bridge is made by high-grade alloy material, and subjected to long-term high and low temperature aging test， as well as rigid technological treatment and adjustment so as to lower the temperature coefficient, increase the accuracy and improve the annual stability. By adopting the specific FangKe high accuracy switch, the contact resistance of the bridge is small and so does its variation:;by using model JZ28 zero indicator, the bridge features high sensitivity, Iow noise and less power dissipation. Therefore, the portable bridge is characterized by wide measurement range, high accuracy, well stability and reliability, compact and lightweight. |
TECHNICAL SPECIFICATION
2.1 All technical indicators of Model QJ57 conform to the standard 1EC564 - 77 ""DC Bnidge for Mleasuring Resistance". 2.2 Environment condition a.Temperature: Reference value: 20士0.5 c , nominal value:15 ℃~25 ℃. b.Relative humidity: Reference value:40%~60%,rnominal value:25%~75%.2.3 Main parameters are shown in Table 1. 2.3 Dimension:320mm*280mm*170mm |
Table 1
Multiple | Effective range | Resolution | Class index | Rn（Referance value） | lman（Test Current） |
×10-3 | 0～1.11110 mΩ | 0.01µΩ | 2% | 1mΩ | 3.4A |
×10-2 | 0～11.1110 mΩ | 0.1µΩ | 0.2% | 10mΩ | 1.1A |
×10-1 | 0～111.110mΩ | 1µΩ | 0.05% | 100mΩ | 500mA |
×1 | 0～1.11110Ω | 10µΩ | 0.05% | 1Ω | 100mA |
×10 | 0～11.1110Ω | 100µΩ | 0.05% | 10Ω | 15mA |
×102 | 0～111.110Ω | 1mΩ | 0.05% | 100Ω | 1.5mA |
×103 | 0～1.11110kΩ | 10mΩ | 0.05% | 1KΩ | 0.2mA |
Including Additional Accessories:
Attached with internal zero indicator, two sections of 9V power supply (6f22)
Double bridge test line cd22c one pair
One special 1.5V regulated power supply