Why do high-frequency probes need to be gold-plated?
Release date:
2021-12-21
High-frequency needle materials typically include phosphor bronze, brass, and beryllium copper. After heat treatment, the components are nickel‑plated and then gold‑plated. The products exhibit high hardness, excellent wear resistance, and stable electrical conductivity.
The probe is manufactured using imported precision lathes or molds, delivering excellent performance. Selecting high‑quality test‑frequency probes is an effective way to address issues such as false open circuits, unstable resistance, short service life, poor contact, electrical arcing, rapid blackening of the probe tip, easy bending, and accelerated wear—thereby promptly boosting testing department efficiency and reducing production costs.
High-frequency needle assembly: The probe typically consists of a spring, a needle tube, and a needle tip.
High-frequency probe materials: Phosphor bronze, brass, and beryllium copper are commonly used. After heat treatment, the nickel‑plated surface is further gold‑plated. The products exhibit high hardness, excellent wear resistance, and stable electrical conductivity. Probe springs: Made from stainless steel wire, piano wire, and precision‑grade materials; probe assemblies are tested on testing machines. Probe quality is rigorously inspected using a probe life‑testing machine, a hardness tester, and an X‑ray thickness gauge.
High-frequency needle tube: The inner and outer walls are thickened and gold-plated, with select springs also gold-plated, reducing resistance, ensuring reliable contact, and preventing oxidation caused by prolonged high-frequency testing as well as adverse environmental influences.
Benefits of gold plating:
Gold-plated probes are corrosion-resistant and less prone to oxidation. The gold plating typically attains a specified thickness, with greater thickness correlating to improved electrical conductivity. When the inner bore of a needle is relatively small and deep, increasing the gold‑plating thickness is the only way to ensure a bright, polished surface; for high‑frequency needles, a thinner resistive layer translates into better conductivity. Additionally, for certain needles featuring blind holes, side ports can be added to allow the plating solution to circulate within the bore, thereby ensuring uniform gold‑plating thickness.
The thicker the gold plating on the probe, the better the product’s electrical performance, wear resistance, and service life. However, a thicker plating also comes at a higher cost. For high-frequency probes, the thinner the gold plating, the more prone it is to blackening and poorer conductivity.
To reduce costs, it is not recommended to choose products that are not gold-plated. To save expenses, there is no need to compromise the integrity of the circuit board. The thickness of the gold plating has no bearing on spring life; rather, spring life depends on test conditions such as the current and voltage applied to the probe, as well as ambient temperature and humidity. Depending on the probe’s installation location and operating requirements, its service life will vary. Factors influencing probe longevity include spring force, whether the operating stroke remains within or exceeds the recommended range, lateral loads, electrical loading, and external influences such as contamination and thermal effects. Regular inspections can help prevent downtime and extend the probe’s service life.
The following recommendations can help you inspect the high-frequency spring probe and ensure the reliability of your tests:
1. Piston wear
Mechanical wear reduces the probe’s service life. The deeper the penetration at the inspection point, the greater the spring force and the more severe the wear. Lateral loads exacerbate coating abrasion, thereby shortening the service life of high‑frequency probes.
2. Clean the probe regularly.
The cleaning pad may be used to clean the needle tip with a needle tip. All other needle shapes should be cleaned of debris using a brush or a cleaning brush. Lateral loads applied to each high-frequency needle during cleaning may cause piston deformation. Furthermore, metal-bristle brushes must not be used. Use an appropriate high-frequency needle cleaning pad. Cut the cleaning pad to the dimensions of the test specimen and place it in the tool rather than on the specimen. When the testing tool is closed, the high-frequency needle will pierce the cleaning pad.
3. Adhere to the mechanical and electrical specifications as well as the temperature range! Only in this way can the reliable testing and service life of the spring‑loaded high‑frequency probe be ensured.
4. Use the designated installation and insertion/removal tools.
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