FT-303Series Surface and Volume Resistance Tester (High Resistance) Details

FT-303 Series of surface

and volume resistivity tester

Reference standard criteria:

1. GB/T 22042-2008 "Test method for surface resistivity of anti-static performance of clothing";

2. EN 1149-1-1995 "Static electricity performance of protective clothing - Part 1: Test methods and requirements for surface resistance"

3. GB/T 1410-2006 "Test methods for volume resistivity and surface resistivity of solid insulating materials" (equivalent to IEC93-1980);

4. FZ/T 64013-2008 "Electrostatic Plush";

5. SJ/10694-2006 "General Specification for Anti static Testing of Electronic Product Manufacturing and Application Systems" 6.1

6. ASTM D257 "Test Method for DC Resistance or Conductivity of Insulation Materials" requires fabrication.

7. GB/T 2439-2001 "Determination of Electrical Conductivity and Dissipation Properties of Vulcanized Rubber or Thermoplastic Rubber";

8. GB/T 10581-2006 "Test method for resistance and resistivity of insulating materials at high temperatures"

9. GB/T 1692-2008 "Determination of Insulation Resistance of Vulcanized Rubber"

10.

GB/T 12703.4-2010 "Evaluation of electrostatic properties of textiles - Part 4: Electrical resistivity"

11.

GB/T 10064-2006 "Test Method for Determining Insulation Resistance of Solid Insulation Materials".

Application Description Scope

of application：

Suitable for measuring the insulation performance of powders, powders, particulate matter, gases, electronic components, dielectric materials, wires and cables, anti-static products such as anti-static shoes, anti-static plastic and rubber products, anti-static raised floors in computer rooms, and measuring the insulation resistance of electronic and electrical products

Function Introduction:

1. The instrument is small in size, light in weight, and stable,

2. Different measuring electrodes (fixtures) can be used to measure the volume resistivity and surface resistivity of different materials (solids, powders, or liquids)

3. High resistance and microcurrent measurement	4. LCD display	5. Both Chinese and English language versions
Parameter data:	Model number	FT-303A
FT-303B	1. Resistance measurement range	measuring range
104Ω～1×1013Ω	104Ω ～1012Ω	2. Resistance measurement range
measuring	104～ 2.0×1013 Ω-cm
104 ～ 2.0×1012 Ω-cm	3. Test voltage
0-1000V	0-500V
4. Basic accuracy	＜1G ±1% ;≥ 1G ±3%; ≥ 1T ± 10% (standard resistance)
5. Display	LCD display: resistivity, temperature, current and voltage, can input test sample data LCD: resistivity.
temperature. current voltage. input test sample data	6. Use environment Temperature: 0 ℃~40 ℃, relative humidity<80% 7. Power Supply supply AC
220V，50HZ， 5W 8. Measuring mode	Configure 232 and USB communication interface, LCD display test or PC software test Configure 232 and USB communication interface. LCD or PC software test
9. Choose a fixture	by fixture	FT-05A solid tricyclic electrode; 2. FT-04A liquid electrode;

3. FT-03A simple powder and paste measuring device;

1.FT-05A

Solid three-ring electrode.

2.FT-04ALiquid electrode.3.FT-03A

powder and paste simple measuring device.

10. PC software (optional)

PC

software (optional)

PC testing software USB communication interface, software interface synchronously displays, analyzes, saves, and prints data! The relationship curve between temperature, resistance, and electrical resistivity; The relationship curve between time, resistivity, and resistance

PC

test software USB communication interface. Synchronous display of software

interface. analyze. save and print data. Temperature with resistance and

resistivity curves. Time with resistivity and resistance curves.

11. Dimensions

L

340mm* W 320mm* H 120mm

L

330mm* W 220mm* H 110mm

Whole machine construction diagram

Display interface diagram

Test interface

Three ring electrode

--

Wiring diagram for surface and volume resistivity testing

Calculation formula:

Volume resistivity ρ v

ρv=Rv(A/h)，

A=(π/4)•d22=(π/4)(d1+2g)2 (3)

In the formula, ρ v - volume resistivity (Ω• m),

Rv - measured sample volume resistance (Ω),

A - Measure the effective area of the electrode (m2),

D1- Measuring electrode diameter (m),

H - thickness of the insulation material sample (m),

G - width of gap between measuring electrode and protective electrode (m),

3.2. Surface resistivity ρ v

ρs=Rs(2π)/㏑(d2/d1)

(4)

In the formula, ρ v - surface resistivity (Ω),

Rs - surface resistance of the sample (Ω),

D2- Inner diameter of protective electrode (m),

D1- Measure the electrode diameter (m).

Electrode fixture+standard resistor

Definition of Insulation Materials

1) Insulation resistance: The quotient obtained by dividing the direct current voltage applied between the two electrodes in contact with the sample by the total current passing through the two electrodes. It depends on the volume resistance and surface resistance.

2) Volume resistance: the quotient of the DC voltage applied between two electrodes placed on opposite surfaces of a sample and the steady-state current flowing between the two electrodes; This current does not include the current along the surface of the material. The polarization that may form between the two electrodes is negligible.

3) Volume resistivity: The quotient of the DC electric field strength and steady-state current density inside an insulating material, which is the volume resistance per unit volume.

4) Surface resistance: the quotient of the voltage applied between two electrodes on a certain surface of a sample and the current flowing between the two electrodes after a certain period of time; The current mainly consists of the current flowing through the surface of the sample, as well as a portion of the current component flowing through the volume of the sample. The polarization that may form between the two electrodes is negligible.

Surface resistivity: The ratio of the direct current electric field strength to the line current density on the surface layer of an insulating material, which is the surface resistance per unit area.

measuring principle

According to the above definition, the resistance measurement of an insulator is basically the same as that of a conductor, and its resistance is generally obtained by the ratio of voltage to current. The existing methods can be divided into three categories: direct method, comparative method, and time constant method.Measurement requirements

Usually, insulation materials are used for mutual insulation and ground insulation of various components in electrical systems, and solid insulation materials also serve as mechanical support. Generally, it is desirable for materials to have the highest possible insulation resistance and possess mechanical, chemical, and heat resistance properties.

The resistivity of insulation materials is generally high, which means that the conducted current is very small. If we do not pay attention to the interference of external factors and the influence of leakage current, the measurement results will have significant errors. The moisture absorption of the insulation material itself and changes in environmental conditions also have a significant impact on the measurement results.

The main factors affecting the testing of volume resistivity and surface resistivity are temperature and humidity, electric field strength, charging time, and residual charge. Volume resistivity can be used as a parameter for selecting insulation materials, and resistivity varies with temperature and humidity. The measurement of volume resistivity is often used to check the uniformity of insulation materials or to detect conductive impurities that can affect material quality but cannot be detected by other methods.

Due to the fact that volume resistance is always included to some extent in surface resistance testing, surface resistance can only be measured approximately, and the measured surface resistance value mainly reflects the degree of surface contamination of the tested sample. So, surface resistivity is not a parameter that characterizes the characteristics of the material itself, but a parameter related to the surface pollution characteristics of the material. When the surface resistance is high, it often changes irregularly over time. The measurement of surface resistance usually requires a 1-minute electrochemical time.

(1) Temperature and humidity: The insulation resistivity of solid insulation materials decreases with increasing temperature and humidity, while the volume resistivity changes greatly with temperature. Therefore, the volume resistivity of electric porcelain materials should not only be measured at room temperature, but also at high temperature to evaluate their insulation performance. Due to the high electrical conductivity of water, the surface resistivity and volume resistivity of ceramic materials with open pores decrease sharply with increasing humidity. Therefore, the determination should be strictly carried out in accordance with the prescribed sample processing requirements and testing environmental conditions.

(2) Electric field strength: When the electric field strength is relatively high, the migration rate of ions increases with the increase of electric field strength, and a large amount of electron migration also occurs near breakdown, at which point the volume resistivity is greatly reduced. Therefore, during the measurement, the applied voltage should not exceed the specified value.

To accurately measure volume resistance and surface resistance, a three electrode system or a circular three electrode system is generally used. When measuring the volume resistance Rv, the function of the protective electrode is to prevent surface current from passing through the measuring instrument and to ensure uniform distribution of the electric field under the measuring electrode. The correct connection method for protecting the electrode at this time is shown in Figure 4. When measuring surface resistance Rs, the role of the protective electrode is to reduce the volume current to a level that does not affect the measurement of surface resistance.

Operation process

1. Preheat for 15 minutes after startup, and the test data is stable

2. Set the parameters of the test sample

3. Display test data

4. PC software processes data and reports

Advantages description:

1. Automatic range

2. LCD display

3. Easy to operate

4. Accuracy stability

5. Can display 5 digits

1.6. Standard resistance calibration instrumentPC

2.Software interface diagram

Report Template:

3.Partial customer cases:

Suqian Jintian Plastic Industry Co., Ltd

4.Dalian Bohui Technology Co., Ltd

Hezhen New Materials Technology (Shanghai) Co., Ltd

5.Henan Bodun Biotechnology Co., Ltd

Wuhan Huashunxing Technology Co., Ltd

Beijing Xuedilong Technology Co., Ltd

Zhejiang Lide Product Technology Co., Ltd

Jiangsu Yizheng Electronic Tube Co., Ltd

Jiangsu Nanwei Yueda Textile Research Institute

Yiaopin Imaging Technology Suzhou Co., Ltd

Guangxi Xinghongyuan Technology Co., Ltd

Wuxi Xiangda Automotive Parts Co., Ltd

Taiyuan University of Technology

Northwestern Polytechnical University

Institute of Process Engineering, Chinese Academy of Sciences

Service Items

Warranty:

12 months, long-term maintenance

Training: Operation Training:

Telephone teaching; USB teaching files; Remote visual communication; On site teaching; Instruction manual and teaching documents

Maintenance and upkeep:

Provide knowledge maintenance and maintenance documents, labels, forms, and maintenance reminders

Verification file:

3Q verification documents, measurement certificates

Extended Services: