MaTestLab > Test Standards > ASTM F390 Standard Test Method for Sheet Resistance of Thin Metallic Films With a Collinear Four-Probe Array
Last updated 17th March 2025
ASTM F390 Standard Test Method for Sheet Resistance of Thin Metallic Films With a Collinear Four-Probe Array
Using a collinear four-probe array, this test method measures the sheet resistance of metallic thin films. It is designed to be used with rectangular metallic films with thicknesses between 0.01 and 100 µm, created through material deposition or thinning and supported by an insulating substrate, and with sheet resistances ranging from 10−2 to 10 4 Ω/□. By delivering a measured direct current through the specimen between the outer probes and detecting the consequent potential difference between the inner probes, a colinear four probe array is utilized to estimate the sheet resistance. Using correction factors related to the specimen's geometry and probe spacing, the sheet resistance is computed from the measured current and potential data.
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ASTM F390 Introduction
Using a collinear four-probe array, this test method measures the sheet resistance of metallic thin films. Procedures for inspecting the electrical measuring device and the probe assembly are part of this test technique. MaTestLab is one of the best testing service providers, with the best network of testing laboratories in the USA to carry out ASTM F390 tests for our clients. By measuring the indentations that the points make on an appropriate surface, the distances between the four probe tips are determined. The state of the tips is also assessed using this technique.
ASTM F390 Test Method
Probe Function
In ASTM F390, a collinear four-probe array is used to compute the sheet resistance by passing a measured direct current through the specimen between the outer probes and measuring the resulting potential difference between the inner probes.
Resistor Function
The accuracy of the electrical measurement apparatus is evaluated using an analog circuit that consists of a known standard resistor and additional resistors that mimic the resistance at the contacts between the probe tips and the film surface.
ASTM F390 Equipment and Sample Preparation
Specimen Detail
ASTM F390 is used to determine metallic thin-film sheet resistance.
Specimen Size
Conditioning the specimen at a thickness variation of less than 10% is recommended.
ASTM F390 Test Result and Interpretation
With a collinear four-probe array, ASTM F390 provides a standardized method for assessing the sheet resistance of metallic thin films. This technique is crucial for thin-film sectors like electronics, semiconductor fabrication, and coatings, where accurate electrical conductivity measurements are necessary for quality assurance and product performance.
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ASTM F390
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Tests Related to ASTM F390
ASTM F390 is related to tests including ASTM E2251 for liquid in glass thermometer specification and ASTM F388 for measurement of oxide thickness on silicon wafers.
Use of ASTM F390 in Various Industries
It is an important standard in the electronics, semiconductor, and photovoltaic industries for characterizing thin metallic films. It ensures consistent evaluation of sheet resistance, which impacts microelectronic components, conductive coatings, and thin-film resistors, and is essential for quality control and device optimization.
Materials Commonly Tested with ASTM F390
It tests thin metallic films such as aluminum, copper, gold, silver, and alloys on substrates like silicon wafers, glass, or flexible polymers, allowing for the precise measurement of electrical properties in microelectronics and flexible electronics.
Importance of ASTM F390
For high-performance applications, the standard is critical as it provides a standardized method to measure sheet resistance for the reliable functionality of thin metallic films and ensures that there is no deficiency in material selection and process optimization, thereby minimizing defects.
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FAQ's
Where can I get the astm f390 tested?
You can share your astm f390 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm f390 test to various testing techniques.
How much do I need to pay for the astm f390 test?
Please contact us for a detailed quote for your astm f390 testing needs. Cost incurred to carry out different astm f390 testing methodology depends on the type of raw material; number of samples, coupons, or specimens; test conditions, turn around time etc. Costs of some ASTM testing methods start from $100 and the final value depends upon the factors listed above. Please contact us for the best and latest prices.
How many samples are required for astm f390?
The required number of samples or specimens should comply with the procedure given in the astm f390 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.
How much discount can I get on the astm f390 test?
MaTestLab has a vast testing laboratory network, hence we bring you the best testing facilities in a cost-effective way. We offer considerable discounts (15-20%) to our returning customers based on test volume and frequency.
How many days will it take to complete the astm f390 test?
The turnaround time for astm f390 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.
Where can I get the astm f390 tested?
You can share your astm f390 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm f390 test to various testing techniques.
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