The FZY-3 mining stray current tester is a portable rectifier instrument with high sensitivity, multi-range protection circuit. Its characteristics are: wide measurement range, with a total of twenty ranges, capable of measuring AC/DC stray voltage and stray current separately, no power supply needed, safe and reliable. It is suitable for testing the current and voltage generated by steel rails, water pipes, cables, etc. in coal mines, preventing electric premature detonation and other combustion and explosion accidents caused by stray current discharge, minimizing fire sources in mines.
Usage methods and precautions:
1. Before measurement, screw the test rod wires into the two binding posts respectively, and adjust the meter pointer to the zero scale line.
2. Place the test rods connected to the binding posts on the two points to be measured (e.g., steel rails, water pipes, cable sheaths, coal, ground, etc.). The two test points should be on different conductors, with a distance of about 2 meters. Normally, measure every 50-100 meters, or temporarily determine test points as needed. Set the switch to the appropriate range, and the meter reading, after conversion, gives the corresponding current value.
3. When measuring with the stray current tester, ensure good contact between the hard alloy tip of the measuring probe and the object under test, and place the instrument horizontally to ensure accurate readings.
4. If no AC stray current is measured at a location, also test for DC stray current, and vice versa.
5. When measuring stray voltage values, the ranges are: 50mA corresponds to 0.2V, 250mA to 1V, 1A to 4V, 5A to 20V, 10A to 40V. (i.e., current value multiplied by 4 equals the voltage value)
6. When the magnitude of stray current is unknown, first set to the maximum range, then gradually decrease until the appropriate measuring range is found.
