Basic functions
The ST2742C automated powder resistivity tester is a measuring instrument that uses the four-probe method to test the "resistivity - pressure" and "compaction density - pressure" characteristics of powder.
2.2 Adopt the main national standards
"GBT 1552-1995 Determination of Resistivity of Silicon and Germanium Single Crystals by Straight-line Four-Probe Method", "GBT 30835-2014 Carbon Composite Lithium Iron Phosphate Cathode Materials for Lithium-ion Batteries"
"GBT 24521-2009 Method for Determining the Resistivity of Coke" and "GBT 40007-2021 Nanomaterials - Contact Method for Measuring the Resistivity of Nanomaterials - General Rules".
2.2 Instrument Set Composition:
The main components of the entire set of instruments include: the measurement and control host, the automatic pressure control console, the automatic height sensor, the feeder, the four-probe electrode, and the corresponding PC measurement and control software modules, etc.
2.3 Advantages and Characteristics:
As one of the formulating units of the national standard for powder resistivity testing, "GBT 40007-2021 Nanomaterials - Contact Measurement Method for Resistivity of Nanomaterials - General Rules", our company has the following
Advantageous features.
a. High-precision national standard four-probe algorithm.
Overcome the errors in contact resistance and test electrode line resistance in the two-electrode method.
The powder resistivity is tested by the national standard four-probe method, which overcomes the drawbacks of the traditional two-electrode method for measuring powder resistivity instruments. It can eliminate the contact resistance between the electrode and the sample as well as the connection between the electrode and the sample
The error caused by the resistance of the wire body is thus highly accurate and has good repeatability.
b. Reasonable and advanced dynamic synchronous pressure and resistivity measurement and control mode.
Overcome the problems of the asynchronous method of pressing the tablet first and then testing, such as the easy scattering of the tablet and the difficulty in forming, as well as the uncontrollable pressure attenuation.
c. Multi-point continuous testing and intelligent fitting of the "resistivity - pressure" curve.
Overcome the traditional single-point and single-chip testing mode to improve work efficiency;
Using a complete curve instead of a single-point representation is more intuitive and comprehensive.
d. Fully automatic multi-point continuous stepped pressure measurement and control conditions, with good repeatability, simplicity and high efficiency.
Overcome the drawbacks of easy fatigue and poor consistency in the manual pressure application mode, and improve work efficiency and testing
Precision.
e. The color screen simultaneously displays multiple parameters such as resistivity, conductivity, compaction density, pressure, and height.
Overcome the limitation of digital LED displays that multiple contents cannot be displayed synchronously.
f. Multi-channel high-precision ADC module ensures high-precision system testing.
It provides five-digit significant display for resistivity and conductivity, as well as four-digit significant display for pressure and height.
g. Human-machine dialogue measurement and control with multi-mode selection, simple and efficient.
In single-machine mode, all parameter Settings and function conversions of the instrument are achieved through touch keys and color screen display.
Online mode, with the corresponding PC software, provides parameter setting interface, measurement and control interface, historical query interface.
It features a complete and convenient online help interface and other functions. It is used to realize the measurement and control functions of the instrument and data query on the PC end
Functions such as viewing, editing, saving, printing, and historical query.
h. The instrument is equipped with self-calibration functions for height and pressure, ensuring that the client maintains high-precision measurement and control effects for a long time.
i. Easy to expand and multi-functional with one machine.
This machine can be directly used as a tablet press or expanded into a compaction density tester and a compaction density-resistivity spectrum tester.
2.4 Applicable Scenarios
This instrument features high measurement accuracy, rich measurement and control functions, simple operation, good stability, excellent repeatability, and multi-functionality in one machine. It is also a new feature that distinguishes it from the previous old models of similar testers
Click!
This instrument is suitable for lithium battery positive and negative electrode material factories, graphite and carbon factories, coking plants, powder metallurgy plants, colleges and universities, research institutes, metrology units, industrial and mining enterprises, etc. It is used for inspection and classification
An important and excellent tool for analyzing the resistivity parameters of powder samples.
Technical parameters
3.1 Characteristic parameters of measurable samples
a. Measurable resistivity range: 15.00×10 -6to 200.00×10 3Ω-cm
Resolution: 1.50×10 -6to 0.01×10 3Ω-cm
b. Measurable sample particle size requirements: It is recommended to be below 40 mesh, with a maximum not exceeding 10 mesh. Excessive fineness has no effect!
c. Measurable sample components: There are no special requirements. As long as there is no corrosive damage to the metal electrode and the plastic material cup, it is acceptable.
d. Selection of material cups and recommended sample quantities: As shown in Table 3.1-1/2/3 for selection of material cups and recommended sample quantities.
Table
3.1 Recommended Table for Cup Selection, Sample Usage and Pressure Range
| Serial number: |
Cup model/Cross-sectional area cm 2: |
ST2742B-FS10/1.0, |
ST2742B-FS20/2.0, |
ST2742B-FS30/3.0 |
| 1 |
Selection reference |
Generally |
the general-purpose type has a large compression ratio |
and the fluffy type has a larger particle size (coking coal type) |
| 2 |
Single dosage (ml) |
1~2 |
2~4 |
3~6 |
| 3 |
Recommended retest times |
2~3 |
2~3 |
2~3 |
| 4 |
Measurable pressure range (MPa) |
0~100 |
0~50 |
0~30 |
3.2 Test condition parameters can be provided
a. Eight-speed constant current source: 0.1uA, 1.0uA, 10uA, 100uA, 1.0mA, 10mA, 100mA, 1.0A.
Voltmeter: 20mV to 2.0V automatic range.
b. Selection of material cups and recommendation of pressure conditions
The system provides a rated pressure of 10000N(1T=1000KG), with selectable pressure ranges of 0 to 100MPa/50MPa/30MPa, which are related to the cross-section of the material cup. For detailed information, please refer to Table 3.1-4.
3.3 Data representation form and precision grade parameters of single-machine mode
a. Real-time synchronous display: resistivity ρ, conductivity σ, compaction density, using the scientific counting method of "5 significant figures + order of magnitude units".
b. Real-time synchronous display: pressure P, height W, 4 significant figures.
c. Real-time synchronous display: Test current magnitude and direction.
d. Result Output: Instrument color screen "Resistivity ρ- Pressure Pa" form.
3.4 Online mode data representation form and accuracy grade parameters
The software measurement and control interface and the instrument's color screen display relevant content in real time synchronously.
b. Synchronously record and output the result of the "resistivity ρ- pressure Pa" form.
c. After the test is completed, a test report can be printed, which includes the forms and curves of "resistivity ρ- pressure Pa" and "compaction density ρV - pressure Pa".
3.5 Instrument external dimensions and weight parameters
a. Dimensions: Length × Width × height =38cm×35cm×58cm
b. Weight: 50Kg
3.6 Instrument Power Supply Configuration parameters
a. Power Supply: Voltage U=220V±10V, frequency f=50Hz±5Hz.
b. Power: P<200W, fuse specification 250V1.0A
3.7 Instrument usage environment and storage method
a. Temperature: T=0-40℃, relative humidity: RH≤60%
b. There should be no strong electromagnetic field interference in the studio, and it should not share power with high-frequency equipment.
c. Store in a cool, dry place free from corrosive gases.
