Explosion-proof Mining Current Tester 

Precautions for Explosion-proof Mining Current Tester

    Before measurement, insert the test leads into the internal test lead holes respectively, and insert both ends of the connecting wire into the two jacks respectively, and adjust the meter pointer to indicate zero line.

    Place the test rods connected to the binding posts on the two points to be measured (such as rails, cable sheaths, coal, etc.) and set the switch to the appropriate gear. The meter reading is the stray current value between the two points. When the pointer turns right, it is positive; when it turns left, it is negative.

    When measuring stray voltage, the connecting clips in the two color posts can be separated. At this time, the meter reading is the voltage value, with mA corresponding to mV and A corresponding to V.

    When the magnitude of stray current is unknown, first set to the maximum range gear, then gradually decrease until the appropriate measurement gear. The instrument should be placed horizontally.

    When the measured current is greater than 5A, the instrument is only suitable for short-time measurement. When the measured current is greater than 10A, only instantaneous measurement is allowed.

    When the instrument is not in use, it should be placed in the (off) position.

I. 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 (such as 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 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 the hard alloy tip of the measuring probe makes good contact with the object being measured, and the instrument should be placed horizontally to ensure accurate readings.

4. When AC stray current cannot be measured at a location, DC stray current should also be tested, and vice versa.

5. When measuring stray voltage values, the gears are: 50mA corresponds to 0.2V, 250mA corresponds to 1V, 1A corresponds to 4V, 5A corresponds to 20V, 10A corresponds 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 reduce until the appropriate measurement gear.

7. When the measured current is greater than 5A, the instrument is only suitable for short-time measurement. When the measured current is greater than 10A, the instrument is only suitable for instantaneous measurement to avoid large currents burning out components and the instrument.

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, it should be placed in the "off" position.

II. Completeness of 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