Performance:
Measurement range and accuracy class
Measurement Range Measurement Accuracy Remarks
Current range 0-50mA-250mA
-1A-5A-10A AC ±5%
DC
±2.5% Before use, the pointer must be adjusted to zero position, i.e., zero adjustment.
Voltage range 0-0.2V-1V
-4V-20V-40V
FZY-III Mining Stray Current Tester 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 selector switch to the appropriate range, 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 is not detected at a location, also test for DC stray current, and vice versa.
5. When measuring stray voltage values, the corresponding ranges are: 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 maximum range, then gradually decrease until the appropriate measuring range is found.
7. When the measured current exceeds 5A, only short-term measurement is allowed; when it exceeds 10A, only instantaneous measurement is allowed to avoid burning out components and the meter.
8. When measuring DC stray current, if the 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.
