DARUI Electric recommends
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., rails, water pipes, cable sheaths, coal, earth, etc.). The two test points should be on different conductors, with a distance of about 2 meters. Normally, measure every 50-100 meters, or determine test points temporarily as needed. Set the selector switch to the appropriate gear, and the meter reading, after conversion, gives the corresponding current value.
3. During measurement, ensure good contact between the hard alloy ** of the measuring probe and the object under test. The meter should be placed horizontally to ensure accurate readings.
4. When AC stray current is not detected at a location, also test for DC stray current, and vice versa.
5. When measuring stray voltage values, the gears are: 50mA corresponds to 0.2V, 250mA to 1V, 1A to 4V, ** to 20V, and 10A to 40V. (i.e., current value multiplied by 4 gives the voltage value)
6. When the magnitude of stray current is unknown, first set to the *maximum range, then gradually decrease to the appropriate measuring gear.
7. When the measured current exceeds **, the instrument should only be used for short-term measurements. When the measured current exceeds 10A, the instrument should only be used for instantaneous measurements to prevent large currents from burning out components and the meter.
8. When measuring DC stray current, if the meter pointer deflects in the reverse direction, swap the test leads.
9. When the instrument is not in use, set it to the "Off" position.
Mine Stray Current Tester
Product Model: FZY-3
Mine Stray Current TesterDetailed Introduction
I. Purpose
The FZY-3 Mine Stray Current Tester is a portable rectifier meter with high sensitivity and multi-range protection circuits. Its features include: wide measurement range, a total of twenty ranges, capable of measuring AC/DC stray voltage and stray current separately, no internal power supply needed, safe and reliable. It is suitable for testing currents and voltages generated by rails, water pipes, cables, etc. in coal mines, preventing premature detonation of electric detonators and other combustion and explosion accidents caused by stray current discharge, minimizing fire sources in mines.
