Explosion-proof Mining Current Tester
Darui Electric recommends for you:
I.Usage Methods and Precautions for Explosion-proof Mining Current Tester
1. Before measurement, screw the test leads onto the two binding posts respectively, and adjust the meter pointer to the zero scale line.
2. Place the test leads connected to the binding posts on the two points to be measured (e.g., steel 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 range 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. If no AC stray current is measured 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 highest range, then gradually decrease to the appropriate measuring range.
7. When the measured current exceeds 5A, the instrument should only be used for short-time measurements; when the measured current exceeds 10A, the instrument should only be used for instantaneous measurements to avoid burning out components and the meter due to high current.
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.
II. Completeness of the Stray Current Tester Product
1. Main unit: one unit
2. Test leads: one pair
3. Product manual: one copy
4. Product certificate of conformity: one copy
Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.
