The multimeter, megohmmeters and use clamp meter.
The commonly used specifications for Mega ohm watches include 250V, 500V, 1000V, 2500, V, and 5000V. The output voltage and its range of measurement shall be taken into account when choosing the ohmmeter. The detection of general high-voltage electrical equipment and circuits requires the use of a high voltage ohmmeter, and the detection of low voltage electrical equipment and circuits using a low voltage is sufficient. Electrical equipment and wiring is usually below 500V with 500 ~ l000V megohmmeter, and porcelain, bus, switch should be more than 2500V megameter.
Use megohmmeter megohmmeters called shake table, tramegger, high resistance meter, insulation resistance tester [/b], is a kind of measuring equipment and electrical circuit insulation resistance meter, its shape is shown in Figure 1 - 1.There are mainly three parts of a European Watch: hand DC generator (some with alternator plus rectifier), magnetoelectric current ratio meter and connection post (L, E, G).
Preparation prior to use1, check whether the European watch can work properly, place the watch horizontally, and empty the handle of the euro watch. The pointer should point to. O, and then slowly shake the handle, so that L and E two terminal pile output line instantaneous short, the pointer should quickly point to zero. Note that the L and E cannot be shorted too long when shaking the handle, otherwise it will damage the watch. ,2, check the electrical equipment and circuit being tested to see if all the power has been cut off. Never allow equipment and lines to be charged with a European watch.3, before measuring, deal with equipment and line the first discharge capacitor discharge equipment or line so as not to endanger the personal safety and damage megohmmeters, it can reduce the measurement error at the same time, attention will be the test point to wipe clean.
