For the maintenance of the magnetic flap thermometer megohmmeter

Magnetic flap thermometer, the study found ZC - Type 7 megohm meter is mainly composed of coil system flow meter and hand generator composed of two parts. Hand generator part of its structure is simple, low failure rate. Fault ascertained and ruled out more easily also. Here to test the agency is given priority to, introduce the maintenance megohmmeter. VoL magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

fault type 1: voL magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

incorrect pointer position of upper and lower voL magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

instrument pointer refers to when open & other; 00' Refers to the zero position, the short circuit. The cause of this is the common faults, megohmmeter is more, most institutions can detect first test coil resistance. 佐- Table 7 type current coil resistance is 15400:15001 - t 1, voltage coil resistance is 520 t 150, such as large difference, coil damage, should be replaced. If moving coil part no problem, should check the calibration of guide wire. Should be the normal operation of not energized the guide wire placed in without any torsion natural shape, moving coil part of the pointer instructions near infinity. Do have a good, can make the guide wire residual stress produced by the additional torque to measure your results of the impact of the minimum. Magnetic flap thermometer calibration are basic requirements of the guide wire, guide wire should be brought within the scope of the whole moving coil rotation and other fixed part touching one another. Especially when change the moving coil should be paid attention to this point. VoL magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

the guide wire is in after hard pulling or other causes damage should be to replace. In the absence of the finished product, can according to the original guide wire length, thickness and width to choose galvanometer wire hanging plate is made, such as ZC - 7 type guide wire can choose AC 15/3 by megger etc galvanometer system of wire hanging plate. Godet requirements after the plate making surface without injured trace, two head solder joint should be smooth and firm. VoL magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

when the coil with fuzz or the impurities such as iron filings, the pointer is easy card lag phenomenon, can't accurate instructions, can be used to wash ears ball blowing out, also can use thin steel needle carefully removed. VoL magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

the line resistance change, also can make a pointer on the lower limit position is not correct, cause all have great value for the error. When voltage loop resistance change, in the range limit of maximum error, instead of current loop resistance changes will cause significant error under the small reading limit. So when repair, must check the current and voltage loop resistance. VoL magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer above

ruled out the possibility of failure, and the lower limit on the meter indicates there is still a little wrong, can consider to use mechanical adjustment. If the pointer is a little less than & other; 0 ', or more than & other; 0' A, can gently pull (pointer to be correct. If the pointer is a little less than & other; ao” Position and turn the guide wire can use tweezers, use residual torque to make a pointer to point to in & other; 00' Position. VoL magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer fault type 2:

voL magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

the movable part of the balance feature bad voL magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

nonlinear error caused by megger, mostly because of the movable balance characteristics caused by the bad part. Due to the magnetic circuit of the magnetic field distribution inside the megohmmeter has a great deal of nonlinear, close to infinity the very weak magnetic field, in particular, minimal torque, so the error will be produced by its bigger, therefore megohmmeter must adjust balance characteristics after repair. Usually adjustment megohmmeter balance method is to use static, namely horizontal megohmmeter, pointer to point to in infinity position at this moment, and then the magnetic flap thermometer respectively before and after the megohmmeter tilt observation pointer from 300. When the pointer in the direction of the tilt of deflection displacement error is less than the accuracy of 1/2 by megger balance performance is qualified. Conversely carefully adjust the pointer end balance weight, make balance performance requirements. VoL magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

voL magnetic flap | | glass thermometer thermometer floating ball thermometer | | double color glass thermometer thermometer