Test probes are precision electronic components used in the testing fields of semiconductor chips, consumer electronics, automotive electronics, new energy, and other precision electronics. They mainly play a key role in signal connection and electrical signal transmission. Whether the selection of probes is appropriate and whether daily maintenance is standardized directly determines the accuracy and stability of test data, while also affecting the service life of probes and the yield of production line testing.

Many problems such as testing errors, frequent probe damage, and false test failures are mostly caused by improper selection, non-standard operation, and inadequate maintenance. This article will comprehensively explain the basic definition, selection points, daily maintenance and upkeep techniques of testing probes, helping everyone to use probes scientifically, reduce losses, and optimize testing results

‌A test probe is a type of electronic component used for testing and measurement, usually formed by three basic components: a needle, a needle tube, and a spring, which are pre pressed and riveted by precision instruments. In electronic testing scenarios, probes are mainly responsible for conducting circuits and transmitting electrical signals: one end precisely contacts the testing point of the product to be tested, and the other end is docked with the testing equipment to build a stable signal transmission channel, providing accurate data support for product functional testing, aging testing, etc. They are essential core components of automated testing fixtures and detection equipment.

Test requirements and characteristics of the tested object

Select the appropriate probe type and specifications based on the physical and chemical properties of the tested object, such as hardness, conductivity, size, etc.

Clarify the specific testing requirements, such as the purpose of testing (aging testing/functional testing), to determine the performance requirements of the probe.

Probe head shape

Select the appropriate probe head type based on the shape, size, and spacing of the measured points. For example, when testing dirty surfaces, it is required that the needle tip has high penetrability, and a pointed probe can be chosen; For testing smaller planes, it is necessary to have multiple points of contact with the object being tested. If the contact is good, small four claw heads can be selected.

Probe elasticity

rootChoose the appropriate elasticity according to the required probe elasticity. In the Centalic product catalog, the size, head shape, electrical parameters, and other specifications of conventional probes are described in detail.

Strictly control the testing environment to prevent oxidation and corrosion

Wet, dusty, and fluctuating temperature conditions can accelerate the oxidation and corrosion of probe metal, increase contact resistance, and cause signal distortion. Especially in high humidity coastal areas, it is necessary to strictly control the temperature and humidity of the testing area, maintain a clean and dry environment, and reduce issues such as probe oxidation and corrosion.

 
 

Preferred fixture board

Based on years of testing experience at Suntory, a large number of probes will be installedUsed on fixtures for rapid testing of circuit boards on automated production lines. Generally speaking, fixture boards made of excellent fixture materials can be very helpful for probes. Firstly, they can reduce the presence of glass fibers. If small powder particles enter the inner wall of the probe, it will cause the reverse effect of the blocking spring; Secondly, precise drilling can greatly help test the verticality of the probe, thereby reducing the risk of unilateral pressure during the testing process and extending the service life of the probe, especially the concentric drilling process is very important.

 

Strictly adhere to the recommended work schedule

At 2/3 of the stroke, the probe has the best testing effect,When more than 2/3 of the journey is completedThe probe spring will experience a significant decrease in service life if it is subjected to high stress for a long time;When less than 2/3 of the journey is completedInsufficient contact pressure can easily cause fluctuations or false measurements in test data due to poor contact.It is recommended to strictly follow the recommended itinerary in the product specification sheet for setting.

The quality of welding accessories is often overlooked, but it has a profound impact on the lifespan of probes. Hard particles or high hardness impurities mixed in inferior solder paste may damage the coating of the probe tip at the moment of contact. By using high-quality solder paste and flux, the physical damage and chemical corrosion of probes caused by pollutants can be reduced from the source.

Regular cleaning of probes

Create a suitable probe replacement schedule

Centalic recommends customers to develop their own probe replacement schedule, using the recommended lifespan of the probes. If any abnormal phenomena occur, it is necessary to replace the probes reasonably.

Although the testing probe is small, it is a big deal related to product quality. From precise selection to refined maintenance, every step affects the final accuracy and long-term reliability of measurement. Mastering the correct "opening method" mentioned above can not only make the best use of the probe, but also safeguard your testing system. As a professional manufacturer with 40 years of experience in the probe industry, Suntory has always been committed to providing customers with technical guidance on probe selection and maintenance through solid research and development and production experience.