Anyone who has done measurement and testing knows that accurate data is mainly determined by the design and measurement capabilities of the test instrument. But very few people understand that the design quality, manufacturing process, compatibility and performance specifications of test lines and connectors are as important as test instruments. Next, Tyco Hanze will explain to you the specific criteria for the correct selection of test wires and spring thimble.
Same as the power supply requirements, the instrument test line and spring thimble must meet strict safety requirements because they are directly in contact with large voltages, especially in line with the international IEC1010 voltage and category requirements, namely CATI, CAT II, CAT III or CATIV. Other requirements of IEC1010 are also related to transient testing, dielectric withstand voltage, or testing to verify that the product has sufficient insulation while meeting current, electrical clearance, exposed metal spring thimble and impact resistance requirements. Good quality test needles and important personal protective equipment such as gloves and eye protection form part of the personal protective measures defined in the NFPA70E standard.
Second, robustness and durability:
High-quality test leads and connectors will not cause performance degradation due to daily friction such as pulling, pressing and puncturing. The two changes of the test line must have a well-designed anti-stress sheath. If the test spring thimble is hardened metal, it can withstand repeated connections and can convey accurate data every time.
Compared with cheap materials, specially manufactured multi-strand tinned beryllium copper wire can provide flexibility, long-term durability, excellent conductivity and precision. Other factors include the internal welding quality of the pogo pin and the connector and the temperature range of the material.
Third, design performance and indicators:
It is very important that the design of test spring thimble and test clip is comfortable or not. The comfortable and easy-to-grab grip surface is conducive to holding the needle firmly in the hand, and the strong spring clamp can ensure a firm connection. The connection should be simple, and the matching parts can slide together effortlessly without stress. The contacts on high-quality connectors should be nickel-plated or gold-plated machined brass connectors, not just cast brass. The use of gold-plated contacts can provide accuracy and oxidation resistance to provide a durable, safe and reliable connection.
The design index of the test line and spring thimble should be consistent with the matching test instrument. If its index is smaller than the test instrument, the true value of the instrument will shrink to a great extent. For example, if the bandwidth of the oscilloscope is 100M and the bandwidth of the matching oscilloscope needle is only 50M, then the oscilloscope becomes 50M.