Introduction:

• This rotary resistance box which has low zero resistance, is used to adjust resistance in DC circuit. This equipment is commonly used in laboratories for schools, factories and scientific research units. 
• The temperature of the air around should be +10℃~+35℃ and the relative humidity 30~80%  when it is used .

Specifications:

Adjusting Range:

     ZX21： (0~9）×（0.1~10k）Ω  ＝0~99.9999 kΩ

     ZX21a:（0~10）×（0.1~10k）Ω ＝0~111.1110 kΩ

     ZX21b：（0~9）×（0.1~10k）Ω ＝0~99.9999 kΩ

     ZX21c：（0~10）×（0.01~1k）Ω＝0~11.11110 kΩ

     ZX21d：（0~10）×（1~100k）Ω ＝0~1.111110MΩ

     ZX21e：（0~10）×（10~1M）Ω   ＝0~11.11110MΩ

     ZX21f：（0~10）×（100~10M）Ω  ＝0~111.1110MΩ

     ZX21g：（0~10）×（1k~100M）Ω ＝0~1.111110GΩ

Zero resistance: （30±5）mΩ:

• The basic errors are regulated in Table 1.
• The allowable current of each group resistance are shown in Table 1
• The dielectric strength between resistance box circuit and shell can withstand 50 Hz frequency,2000V AC, which lasts 1 minute.
• The insulation resistance between resistance box circuit and shell is not less than 1000MΩ
• The weight of the resistance box is about 1.3 kg,and its size is 200×150×110mm3.