Mine Stray Current Tester Factory Direct features:
Wide measurement range, with a total of twenty ranges, can separately measure AC/DC stray voltage and stray current, no power supply needed, safe and reliable. Suitable for testing current and voltage generated by rails, water pipes, cables, etc. in coal mines, preventing electric detonator premature explosion and other combustion and explosion accidents caused by stray current discharge, reducing fire sources in the mine to the lowest limit.
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., rails, water pipes, cable sheaths, coal, ground, etc.). The two measuring points should be on different conductors, with a distance of about 2 meters. Normally measure every 50-100M, or temporarily determine test points as needed. Set the 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 tip of the measuring probe and the object under test. The instrument should be placed horizontally to ensure accurate readings.
4. When AC stray current cannot be measured at a location, also test DC stray current, and vice versa.
5. When measuring stray voltage, the gears 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 gives the voltage value)
6. When the stray current magnitude is unknown, first set to the maximum range, then gradually decrease to the appropriate measuring gear.
7. When the measured current exceeds 5A, the instrument should only be used for short-term measurement; when it exceeds 10A, only for instantaneous measurement, to avoid large currents 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.
