Rotating resistance box

1Rotating resistance boxstructural characteristics

The resistance box support has a potential lead out terminal that can be calibrated according to the components. The contact ring, contact piece, and brush in the switch are all tightly pressed with micro springs, so the contact resistance deteriorates less after use. The support is made of high insulation polystyrene material with good insulation performance. The readings on the panel are arranged in two straight lines for clear and concise reading. When all the conversion switches in the resistance box are placed in the zero position, the zero resistance is 0.01 ohms.

IIRotating resistance boxtechnical indicators
1. When all three read-only disks are at zero position, the measured resistance value is (30 ± 5) m Ω.
2. The maximum small step value is 1 Ω.
3. Resistance box adjustment range: 0-1110 Ω.
4. The reference temperature and nominal temperature range of the resistance box shall comply with the following regulations:
Parameter range: 20 ± 0.5 ℃
Nominal range: 20 ± 5 ℃
5. The reference relative humidity and nominal relative humidity range of the resistance box should comply with the following regulations:
Reference range: 40% to 60%
Nominal range: 25% to 75%
6. The reference power and nominal power of the resistance box are specified in Table 1:
Table 1
Ten inch disk Ω× 100 × 10 × 1
Reference power 0.05W0.05W0.005W
Nominal power 0.1W0.1W0.01W
7. Under reference conditions of temperature, relative humidity, and power, the accuracy of each ten inch reading dial should meet the requirements of Table 2:
+Table 2
Ten inch disk Ω× 100 × 10 × 1
Accuracy% ± 0.1 ± 0.1 ± 0.5
8. Temperature and power under reference conditions, relative humidity exceeds the reference range but remains within the standard range. The additional error caused by changes in relative humidity shall not exceed the corresponding level index value.
9. Relative humidity and power under reference conditions, when the temperature exceeds the reference range, but within the nominal range, the additional error rate difference caused by temperature changes does not exceed the corresponding level index value.
10. Under reference conditions, the temperature and relative humidity exceed the reference power range, but within the nominal power range, the additional error caused by power changes should not exceed the corresponding level index value.