Instructions and precautions for FZY-III Mining Stray Current Tester:
1. Before measurement, screw the test rod wires tightly into the two binding posts, 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 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 switch to the appropriate range, and the meter reading will give the corresponding current value after conversion.
3. During measurement, ensure the hard alloy tip of the measuring probe makes good contact with the object under test, and keep the meter level to ensure accurate readings.
4. If no AC stray current is detected at a location, also test for DC stray current, and vice versa.
5. When measuring stray voltage, the ranges correspond as follows: 50mA corresponds to 0.2V, 250mA to 1V, 1A to 4V, 5A 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 highest range, then gradually decrease until an appropriate measuring range is found.
7. When the measured current exceeds 5A, only short-time measurements are allowed; when it exceeds 10A, only instantaneous measurements are allowed to avoid 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.
Note: The above information and technical parameters are compiled and released by Yangzhou Dary Electric Co., Ltd.
