FZY-3 Mining Stray Current Tester Technical Parameters:
Measurement Range Current Gear 0-50mA-250mA -1A-5A-10A
Voltage Gear 0-0.2V-1V -4V-20V-40V
Measurement Accuracy AC ±5%
DC ±2.5%
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 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 rotary switch to the appropriate gear, and the meter reading, after conversion, gives the corresponding current value.
3. During measurement, ensure the hard alloy tip of the measuring probe makes good contact with the object under test, and the meter should be placed horizontally to ensure accurate readings.
4. If 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 corresponding gears are: 50mA corresponds to 0.2V, 250mA to 1V, 1A to 4V, 5A to 20V, and 10A to 40V. (That is, the current value multiplied by 4 gives the voltage value.)
6. When the magnitude of stray current is unknown, first set to the maximum range gear, then gradually decrease until the appropriate measuring gear is found.
7. When the measured current exceeds 5A, only short-time measurement is allowed; when the measured current exceeds 10A, only instantaneous measurement is allowed to avoid burning out components and the meter.
