NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Author: Noyafa–POE checker
How to check and verify the cable fault tester in the field? Cable fault tester manufacturers Cables and wires are widely used at present. As we all know, these are indispensable now, so how to solve their problems? How to check and verify the cable fault tester in the field? Cables and wires are widely used at present. As we all know, these are indispensable now, so how to solve their problems? Cable fault tester millivolt transmitter calibration steps Cable fault tester manufacturer 1) Wiring.
Select the temperature compensation resistor Rcu according to the type of galvanic couple. 2) Check the upper bridge current. Adjust w: make the upper bridge current 1mA.
Connect an ammeter between terminals ④ and ⑥ to check whether it is 1mA. 3) Open loop magnification check and anti-signal check. Adjust wl to make the feedback voltage zero.
Since the potential may have a certain initial resistance, the feedback voltage is not completely zero.—·A short-circuit line will short-circuit R2 and Rm, resulting in an open-loop state of the whole machine. Then input a signal to make the output current be 0.5-1mA, and then add 50KvDC signal, the output current is more than 10mA, it is qualified as 1; when it reaches 10mA, it is necessary to adjust the wd—60mv. If it is an automatic adjustment system, it is allowed to switch the adjuster to manual operation, and then the cable fault tester's“work-check”Switch to check gear.
The non-automatic adjustment system can directly set the switch to the check position. If the output current is 4—Any value between 6mA, the cable fault tester is working properly. If the temperature sensing element is a thermocouple, when it needs to be verified on site, a portable cable fault tester can be used instead of the thermocouple to send the m number to check whether the output current is correct. At this time, the temperature compensation resistor should be short-circuited.
Then, the military point, range and accuracy can be calibrated according to the indoor calibration method. If the temperature sensing element is a thermal resistance, a portable resistance box can be used instead of the thermal resistance. Check and adjust the zero point, range and accuracy according to the resistance value of each point temperature given on the resistance box.
Cable fault tester manufacturer Shenzhen Noyafa Electronic Technology Co., Ltd.
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