How much is the domestic volume surface resistance tester

Volume surface resistance testerMain Features

Resistance measurement range: 1 × 104 Ω~1 × 1018 Ω;

Current measurement range 2 × 10-4A to 1 × 10-16A;

Small size, light weight, high accuracy;

*The dual display of the measured resistance and the current flowing through the resistance makes the operation and measurement more convenient;

Stable performance and convenient reading;

Can measure both resistance and current;

There are six voltage options for testing: DC10V, 50V, 100V, 250V, 500V, and 1000V;

Easy to use and operate, it can directly read and display digital results at any resistance range and test voltage, eliminating the trouble of multiplying by a coefficient, making measuring ultra-high resistance as simple as measuring ordinary resistance samples with a multimeter.

Volume surface resistance tester

Three electrode wiring instructions

Two electrodes can be used to measure resistance, one connected to the high voltage electrode and the other to the current electrode. The ground wire of the instrument is used for shielding, and when measuring high resistance, it should be connected to the ground of the shielding box to prevent interference. It is not necessary to measure low resistance. A three electrode measurement method is recommended in the national standard GB1410 "Test Method for Volume and Surface Resistivities of Solid Insulation Materials":

It is composed of three independent electrodes:

1. The center is a cylinder with a diameter of 50mm. The standard does not specify a height, but it is generally 40mm

2. The cylinder is surrounded by a circular ring with an inner diameter of 60mm and an outer diameter of 80mm. The standard does not specify a height, but it is generally 40mm

3. The bottom is a flat plate and a circular plate with a diameter of 100mm There is no specified thickness in the standard, but it is generally 5mm

If using this three electrode method to measure the surface resistance or volume resistance of materials, the wiring can be done as shown in the following diagram:

4. Measuring surface resistance: (the resistance measured when current flows through the surface of the object being measured)

Instrument high voltage output (red) connected to circular electrode

Instrument current input terminal (core wire) connected to cylindrical electrode

Instrument ground (black, shielded wire) connected to disk electrode

5. Measuring volume resistance: (the resistance measured when current flows through the body of the object being measured)

Instrument high voltage output (red) connected to disk electrode

Instrument current input terminal (core wire) connected to cylindrical electrode

Instrument ground (black, shielded wire) connected to circular electrode

Please place the measured material on top of the circular electrode and the cylindrical electrode in the middle of the circular electrode. First, turn the switch on the shielding box to the middle 0 position. If there is no high voltage output at this time, cover the shielding box and then connect it to the instrument.

If the switch is in the Rv position on the left, the volume resistance Rv is measured. At this time, the voltage is applied to the bottom disk electrode, and the current flows from the disk electrode through the measured material to the column electrode.

If the switch is in the Rs position on the right, the surface resistance Rs is measured. At this time, the circular electrode changes to voltage, the circular electrode is connected, and the current flows from the circular electrode through the material surface to the cylindrical electrode.

meet the standards

GB/T 1410-2006 Solid insulation materials - Test methods for volume resistivity and surface resistivity

Working principle

According to Ohm's Law, the measured resistance R is equal to the applied voltage V divided by the current I passing through

V

R= -----

I

Insulation resistance tester (digital megohmmeter)

Accuracy: The accuracy is better than the following table

Effective display range of range: 20-30 ℃ RH<80%<>

104 0.01~19.99 5%

105 0.01～19.99 5%

106 0.01～19.99 5%

107 0.01～19.99 5%

108 0.01～19.99 5%

109 0.01～19.99 5%

1010 0.01~19.99 5%+2 words

1011 0.01~19.99 5%+2 words

1012 0.01~19.99 5%+5 words

1013 0.01~19.99 10%+5 words

1014 0.01~19.99 10%+5 words

Above 1014, 0.01~19.99, 10-15%+5 words

When the effective display range is exceeded, the error may increase. The accuracy of the test current is the same as that of the resistance, and the accuracy of the test voltage is 10%

GB 12014 Anti static Work Clothes

GB/T 20991-2007 Test Methods for Personal Protective Equipment Shoes

GB 4385-1995 Technical Requirements for Anti static Shoes and Conductive Shoes

GB 12158-2006 General Guidelines for Preventing Static Electricity Accidents

GB 4655-2003 Safety Regulations for Static Electricity in Rubber Industry

GB/T 12703.4-2010 Evaluation of Electrostatic Properties of Textiles Part 4: Electrical Resistance

GB/T 12703.6-2010 Evaluation of Electrostatic Properties of Textiles Part 6 Fiber Leakage Resistance

GB 13348-2009 Safety Regulations for Static Electricity of Liquid Petroleum Products

GB/T 15738-2008 Test Method for Electrical Resistance of Conductive and Antistatic Fiber Reinforced Plastics

GB/T 18044-2008 Carpet Static Behavior Evaluation Method Walking Test

GB/T 18864-2002 Limits of electrical resistance for antistatic and conductive products used in vulcanized rubber industry

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

GB/T 22043-2008 Test Method for Antistatic Performance of Clothing by Resistance (Vertical Resistance) of Materials

GB/T 24249-2009 Anti static Clean Fabric

GB 26539-2011 Antistatic Ceramic Tiles

GB/T 26825-2011 Anti static and Anti corrosion Adhesive

GB 50515-2010 Code for Design of Conductive (Anti static) Grounds

GB 50611-2010 Code for Design of Anti static Electrical Engineering for Electronic Engineering

GJB 105-1998-Z Electronic Product Anti static Discharge Control Manual

GJB 3007A-2009 Technical Requirements for Anti static Working Areas

GJB 5104-2004 General Requirements for Anti static Coatings and Static Performance of Radio Fuze Wind Hats

(Digital megohmmeter) where ρ is the resistivity, L is the length of the material, and S is the area. It can be seen that the resistance of a material is directly proportional to its length, that is, when the material and cross-sectional area remain constant, the longer the length, the greater the resistance of the material; and inversely proportional to the cross-sectional area of the material, that is, when the material and length remain constant, the larger the cross-sectional area, the smaller the resistance.

The formula for calculating resistivity is:

ρL

R= —

S

ρ is the resistivity - commonly used unit Ω· mm2/m

S is the cross-sectional area - commonly measured in square meters

R is the resistance value - commonly used unit Ω

L is the length of the wire - commonly measured in meters