FZY-3 Stray Current Tester



The FZY-3 Stray Current Tester has a wide measurement range, with a total of twenty ranges, capable of measuring AC and DC stray voltage and stray current respectively. It does not require its own power supply and is safe and reliable.



 FZY-3 Stray Current Tester

 



I. Purpose



   



         The FZY-3 Mine Stray Current Tester is a portable rectifier instrument with high sensitivity and a multi-range protection circuit. Its characteristics are: wide measurement range, with a total of twenty ranges, capable of measuring AC and DC stray voltage and stray current respectively. It does not require its own power supply and is safe and reliable. It is suitable for testing the current and voltage generated by steel rails, water pipes, cables, etc. in coal mines, preventing premature detonation of detonators and other explosion accidents caused by stray current discharge, and reducing fire sources in mines to the lowest level.



    



II. Performance



    



            Measurement range and accuracy class of the instrument



      



      


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


 



      



     III. Usage Methods and Precautions



Before measurement, screw the test lead connectors onto the two binding posts respectively, and adjust the meter pointer to the zero scale line.



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 position, and the meter reading, after conversion, gives the corresponding current value.



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.



When AC stray current cannot be measured at a location, also test for DC stray current, and vice versa.



When measuring stray voltage, the corresponding ranges are: 50mA corresponds to 0.2V, 250mA to 1V, 1A to 4V, 5A to 20V, 10A to 40V. (i.e., current value multiplied by 4 gives the voltage value)



When the magnitude of stray current is unknown, first set to the maximum range, then gradually decrease to the appropriate measurement range.



When the measured current exceeds 5A, the instrument should only be used for short-time measurement. When the measured current exceeds 10A, the instrument should only be used for instantaneous measurement to avoid burning out components and the instrument.



When measuring DC stray current, if the meter pointer deflects in the reverse direction, swap the test leads.



When the instrument is not in use, set it to the "OFF" position.



 



IV. Product Completeness



 



Main unit                    One



Test leads                   One pair



Product manual              One copy



Product certificate           One copy