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Electromechanical relay refers to an electrical device that conducts or disconnects the controlled output circuit when the input quantity (such as voltage, current, temperature, etc.) reaches a specified value. A relay is an automatic control device that changes its output in a jumping manner when the input quantity (electricity, magnetism, sound, light, heat) reaches a certain value. The relay characteristics of the relay. The input signal x of the relay continuously increases from zero to the action value xx when the armature starts to close, and the output signal of the relay immediately jumps from y=0 to y=ym, that is, the normally open contact goes from open to on. Once the contact is closed, the input x continues to increase, and the output signal y will not change again. When the input quantity x drops from a value greater than xx to xf, the relay begins to release and the normally open contact opens. We refer to this characteristic of relays as relay characteristics, also known as the input output characteristics of relays. The ratio of the release value xf to the action value xx is called the feedback coefficient, that is, the ratio of the control power Pc output on the contact Kf=xf/xx to the minimum power P0 absorbed by the coil is called the control coefficient of the relay, that is, Kc=PC/P0 Test 1. Measure the contact resistance Use the resistance range of a multimeter to measure the resistance between the normally closed contact and the moving point. The resistance value should be 0 (using a more accurate method, the contact resistance value can be measured within 100 milliohms); The resistance between the normally open contact and the moving point is infinite. From this, it can be distinguished that is a normally closed contact and that is a normally open contact 2. Measure the coil resistance A universal meter R can be used × Measure the resistance of the relay coil at 10 Ω to determine if there is an open circuit in the coil 3. Measure the pull-in voltage and pull-in current Find an adjustable voltage regulator and ammeter, input a set of voltage to the relay, and connect an ammeter in series in the power supply circuit for monitoring. . Slowly increase the power supply voltage, and when you hear the relay closing sound, note the closing voltage and current. For accuracy, you can try multiple times to find the average value4. Measure the release voltage and release current Function of testing report:1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report 2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problems100% inspection and testing process:1. Telephone communication and confirmation of requirements 2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:1. The testing industry is fully covered, meeting different testing needs 2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate 4. Free initial testing, with no testing fees charged 5. Self service order delivery for free on-site sampling 6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China
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