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Xtester-Selection Guide for DC Resistance Box

2025-03-28 15:03:06 Billy

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DC Resistance Box Selection Guide

No.

Model

开关组数Groups of switch

Accuracy

Range

Min Step Value 

10*

1010Ω

10*

109Ω

10*

108Ω

10*

107Ω

10*

106Ω

10*

105Ω

10*

104Ω

10*

103Ω

10*

102Ω

10*

10Ω

10*

1Ω

10*

10-1Ω

10*

10-2Ω

10*

10-3Ω

1

ZX21

6

0.1

0-99999.9Ω

0.1Ω

-

-

-

-

-

-

0.1

0.1

0.5

1

2

5

-

-

2

ZX21A

6

0.1

0-111111.0Ω

0.1Ω

-

-

-

-

-

-

0.1

0.1

0.1

0.1

0.5

2

-

-

3

ZX25A.P

6

0.02

0.01-11111.11Ω

0.01Ω

-

-

-

-

-

-

-

0.02

0.02

0.05

0.2

1

5

-

4

ZX36

4

0.1

0-9999Ω

1Ω

-

-

-

-

-

-

-

0.1

0.5

1

2

-

-

-

5

ZX54

7

0.01

0.01~111111.11Ω

0.01Ω

-

-

-

-

-

-

0.01

0.01

0.01

0.05

0.2

1

5

-

6

ZX74E,A,P

6

0.01

0.100-1111.210Ω

0.001Ω

-

-

-

-

-

-

-

-

0.01

0.01

0.05

0.5

2

5

7

ZX74B

7

0.01

0.100-11111.210Ω

0.001Ω

-

-

-

-

-

-

-

0.01

0.01

0.01

0.05

0.5

2

5

8

ZX75E、A

6

0.01

0.01~11111.11Ω

0.01Ω

-

-

-

-

-

-

-

0.01

0.01

0.02

0.05

0.5

5

-

9

ZX76E、A

6

0.01

0-111111.0Ω

0.1Ω

-

-

-

-

-

-

0.01

0.01

0.01

0.02

0.1

1

-

-

10

ZX76B

7

0.01

0-1111111.0Ω

0.1Ω

-

-

-

-

-

-

0.01

0.01

0.01

0.02

0.1

1

-*

-

11

ZX77E、A

6

0.05

0-1111110Ω

1Ω

-

-

-

-

-

-

0.05

0.05

0.05

0.05

1

-

-

-

12

ZX78

7

0.005

0.01-111111.10Ω

0.01Ω

-

-

-

-

-

-

0.005

0.005

0.005

0.01

0.05

0.5

5

-

13

ZX79C+D

8

0.2

0-121111.110MΩ

1kΩ

5

2

1

0.2

0.2

0.2

0.2

0.2

-

-

-

-

-

-

14

ZX83E、P

6

0.05

0~11.11110MΩ

10Ω

-

-

-

-

0.05

0.05

0.05

0.05

0.05

0.05

-

-

-

-

15

ZX83D

7

0.05

0-11.111110MΩ

1Ω

-

-

-

-

0.05

0.05

0.05

0.05

0.05

0.1

1

-

-

-

16

ZX84E、P

6

0.05

0~111.1110MΩ

100Ω

-

-

-

0.1

0.05

0.05

0.05

0.05

0.05

-

-

-

-

-

17

ZX84D

7

0.05

0-111.11110MΩ

10Ω

-

-

-

0.1

0.05

0.05

0.05

0.05

0.05

0.1

-

-

-

-

18

ZX92E.A

5

0.1

0-1111.10Ω

0.01Ω

-

-

-

-

-

-

-

-

0.1

0.1

0.5

2

5

-

19

ZX94E、A

5

0.1

0-111110Ω

1Ω

-

-

-

-

-

-

0.1

0.1

0.1

0.1

0.5

-

-

-

20

ZX95E、A

6

0.1

0-11111.10Ω

0.01Ω

-

-

-

-

-

-

-

0.1

0.1

0.1

0.5

2

5

-

21

ZX96E、A

6

0.1

0-111111.0Ω

0.1Ω

-

-

-

-

-

-

0.1

0.1

0.1

0.1

0.5

2

-

-

22

ZX97E、A

6

0.1

0-1111110Ω

1Ω

-

-

-

-

-

-

0.1

0.1

0.1

0.1

0.5

-

-

-

23

ZX98E、A

7

0.1

0-111111.10Ω

0.01Ω

-

-

-

-

-

-

0.1

0.1

0.1

0.1

0.5

2

5

-

24

ZX99E.A

7

0.1

0-1111111.0Ω

0.1Ω

-

-

-

-

-

-

0.1

0.1

0.1

0.1

0.5

2

-

-

25

ZX99-IA

8

0.1

0-1111111.10Ω

0.01Ω

-

-

-

-

-

-

0.1

0.1

0.1

0.1

0.5

2

5

-

26

ZX99-IIA

8

0.1

0-11111111.0Ω

0.1Ω

-

-

-

-

0.2

0.1

0.1

0.1

0.1

0.1

0.5

2

-

-

Note: 1000000ohm=1MΩ,  100000ohm=0.1MΩ

1,ZX99 DC Resistance Box: Range:0-1111111.0Ω Accuracy:0.1Ω 7Gears

图片关键词

2，ZX74 DC Resistance Box: 0.100-1111.210Ω,0.001Ω accuracy 6Gears

图片关键词

3，ZX99A DC Resistance Box: Range: 0-1111111.0Ω,Accuracy: 0.001Ω accuracy  7Gears

图片关键词

4，ZX95 DC Resistance Box: Range: 0-11111.10Ω,Accuracy: 0.01Ω accuracy 6Gears

图片关键词

5，ZX99-1A DC Resistance Box: Range: 0-1111111.10Ω,Accuracy: 0.01Ω accuracy 8Gears,1000000ohm=1MΩ

图片关键词

6,ZX99-IIA  8Gears Range:0-11111111.0Ω（0-11.111111MΩ）,Accuray 0.1 DC Resistance Box, 35*35*18CM, 2.5KG.

图片关键词

7,ZX78, 7Gears Range:0.01-111111.10Ω,High Accuracy:0.005 DC Resistance Box

图片关键词

图片关键词

Introduction to DC Resistance Box

DC Resistance Box is a laboratory instrument used to provide precise and adjustable resistance values in DC circuits. It is widely applied in electronic measurements, equipment calibration, and circuit experiments. Below are its key details

1. Structure and Components

1，Resistor Elements: Contains multiple precision resistors (e.g., wire-wound resistors, metal foil resistors) with low temperature coefficients and high stability.
2，Adjustment Mechanism: Utilizes knobs or switches to combine different resistance values, typically designed in a decimal format (e.g., ×1Ω, ×10Ω, ×100Ω ranges) for quick adjustments.
3，Terminals: Provides input/output interfaces, usually labeled with "+" and "-" polarities to ensure proper circuit connection.

2. Working Principle

1，Series Combination: Rotating switches select resistors in series across different ranges, with the total resistance being the sum of selected values.
2，Contact Control: Internal switches or knobs toggle resistor paths, requiring minimal contact resistance (typically <0.01Ω) to maintain accuracy.

3. Core Functions

1，Resistance Adjustment: Delivers precise adjustable resistance (e.g., 0.1Ω–10MΩ) to simulate various loads
2，Calibration and Testing: Calibrates ammeters, voltmeters, or multimeters to verify measurement accuracy.
3，Education and Experiments: Demonstrates circuit fundamentals like Ohm’s law and voltage/current division principles.

4. Key Specifications

1，Resistance Range: Common models cover 0.1Ω to 10MΩ, depending on range design.
2，Accuracy Class: High-precision models achieve ±0.01% (e.g., Class 0.01), while standard models range from ±0.1% to ±1%.
3，Rated Power: Individual resistors typically handle 0.25W–1W; overload must be avoided to prevent damage.
4，Temperature Coefficient: High-quality units feature coefficients as low as ±5ppm/℃ (parts per million per °C).

5. Usage Precautions

1，Safe Operation: Confirm resistance settings before power-on to avoid exceeding current limits (e.g., max. allowable current ≤0.1A).
2，Overload Protection: Do not exceed rated power (e.g., 10Ω range at 1W allows max. current of 0.316A).
3，Maintenance: Clean contacts regularly to prevent oxidation-induced poor connectivity.
4，Calibration: Periodically recalibrate, especially before precision measurements.

6. Typical Applications

1，Lab Calibration: Serves as a standard resistance source for calibrating bridges, digital multimeters, etc.
2，Circuit Debugging: Simulates loads or adjusts voltage division in power supply designs or sensor circuits.
3，Educational Demos: Used in student experiments for building voltage dividers or verifying Kirchhoff’s laws.

7. Selection Guidelines

Choose accuracy classes based on needs (e.g., Class 0.05 for metrology, Class 0.5 for education).

Ensure maximum allowable current/voltage ratings match circuit requirements.

Opt for shielded designs or four-terminal (Kelvin) connections to minimize lead resistance effects.

With high precision and flexibility, the DC resistance box is essential for electronics engineers, researchers, and educators. Proper usage and maintenance ensure longevity and reliable performance.


Lable: ZX74_ZX99_ZX98_ZX95_DC_Resistance_Box Selection Guide

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