JDR Series Ground Resistance Tester is based on the International Electrotechnical Commission IEC335-1 standard and national standard GB4706.1-98 in the design and manufacture of the relevant provisions, the dc constant current source and composition of the smart SCM system ground resistance testing system. 
 Model JDR-5B JDR-5A 
 Test current DC10A/25A DC25A 
 Form of constant current 
 Current Accuracy ± 1% of reading ± 2% of reading 
 Display the current resistance resistance resistance 
 Set the alarm can be set arbitrarily 0.1Ω 
 Time setting continuous / 1 ~ 99s arbitrarily set ~ 6 seconds 5 seconds 
 Resistance Accuracy ± (2% of reading +1 mΩ) ± (2% of reading +1 digit) 
 Dimensions (mm) 340 × 395 × 110