I. Application
ZX78DC Type Multi-Value ResistorSuitable for factories, schools, and research institutions, used in DC circuits as known resistors and precision adjustable resistors, or for calibrating complete DC single-bridge circuits and resistance thermometers, etc.
Section II: Main Technical Specifications of Resistors
1、7The resistance is at zero when all the readout disks are at zero position.10±2）mΩ。
2Increment value is greater than0.01Ω。
3Resistor adjustment range:0～111111.10Ω。
4The reference temperature and nominal temperature of resistors should comply with the following regulations:
Parameter Range:20±0.5℃
Named Range:20±5℃
5The reference relative humidity and nominal relative humidity range of the resistors should comply with the specifications.
Reference Range:40%～60%
Named Range:25%～75%
6The reference power rating for the resistor, with the nominal power being0.05WAnd0.1W。
7At reference conditions, the accuracy of each decimal dial should conform to the table for temperature, relative humidity, and power.1Requirements:
Table1
Decimal plate Ω | ×10k | ×1k | ×100 | ×10 | ×1 | ×0.1 | ×0.01 |
Accuracy% | 0.005 | 0.005 | 0.01 | 0.02 | 0.05 | 0.5 | 5 |
8At reference conditions, the temperature and power are within the standard range, although the relative humidity exceeds the reference range. The additional error caused by the change in relative humidity does not exceed the corresponding grade index value.
9At reference conditions, relative humidity and power, with temperature exceeding the reference range but within the rated range, the additional bit error rate difference caused by temperature variation does not exceed the corresponding one-grade index value.
10At reference conditions, the temperature and relative humidity shall exceed the reference power range but remain within the rated power range. The additional error caused by the power variation should not exceed the corresponding index value of one grade.
11The insulation resistance between the resistor's circuit and the metal housing should be greater than500MΩ。
12The resistor's circuit should be able to withstand the metal housing.45～65HZLine Voltage2000V, lasted for oneMinutes of test, no piercing.
13Dimensions:31×24×16cm3
14Weight:1.9kg
Section 3: Precautions
1Prior to using the resistor, rotate each switch a few times to stabilize the instrument's contact.
2Resistors should be securely connected with wires during use and should not exceed the rated power.
3Resistors should be stored in an environment with a temperature of10～30°C, relative humidity not exceeding75%Within the environment, the air should not contain corrosive gases; harmful gases can be detrimental to the instruments. The instruments should also not come into contact with impurities. Avoid direct sunlight exposure to the instruments.
I. Usage
ZX78Type DC Multi-value ResistorSuited for factories, schools, and research institutions, used in DC circuits as known resistances and precision adjustable resistances, or for calibrating complete DC single-bridge circuits and resistance thermometers, etc.
Section II: Main Technical Specifications of Resistors
1、7The resistance value is when only the readout disk is at zero.10±2）mΩ。
2Smaller step value0.01Ω。
3Resistor adjustment range:0～111111.10Ω。
4The reference temperature and nominal temperature of resistors shall comply with the following specifications:
Parameter Range:20±0.5℃
Named Range:20±5℃
5The reference relative humidity and nominal relative humidity range of resistors should comply with the specified requirements:
Reference Range:40%～60%
Nominal Range:25%～75%
6The reference power rating for the resistor is the nominal power.0.05WAnd0.1W。
7Temperature, relative humidity, and power accuracy for each decimal reading dial should meet the specifications in the table under reference conditions.1Requirements:
Table1
Decimal plate Ω | ×10k | ×1k | ×100 | ×10 | ×1 | ×0.1 | ×0.01 |
Accuracy% | 0.005 | 0.005 | 0.01 | 0.02 | 0.05 | 0.5 | 5 |
8Temperature and power are within the reference conditions; relative humidity exceeds the reference range but remains within the standard range. Additional errors caused by changes in relative humidity do not exceed the corresponding index value of one grade.
9At reference conditions, relative humidity and power, with temperature exceeding the reference range but within the rated range, the additional error rate difference caused by temperature variation does not exceed the corresponding grade index value.
10At reference conditions, the temperature and relative humidity should exceed the reference power range but remain within the rated power range. The additional error caused by the power variation should not exceed the corresponding grade index value.
11The insulation resistance between the resistor's circuit and the metal housing should be greater than500MΩ。
12The resistor's circuit should be able to withstand the metal housing.45～65HZAC Voltage2000V, lasted oneMinute test does not puncture.
13Dimensions:31×24×16cm3
14Weight:1.9kg
Section 3: Precautions
1Prior to using the resistor, rotate each switch a few times to ensure stable contact with the instrument.
2Resistors should be securely connected with wiring during use, and the power should not exceed the rated power.
3Resistors should be stored in an environment with a temperature of10～30°C, relative humidity not exceeding75%Within the environment, the air should not contain corrosive gases; harmful gases can be detrimental to the instruments. The instruments should also be free from contact with impurities. Avoid direct sunlight exposure to the instruments.
