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HANGZHI 10mA High-precision Fluxgate Current Transducer Test Verification

Recently, HANGZHI's micro-current detection technology has made breakthrough progress. Our high-precision micro-current sensor can currently achieve a minimum recognition of 10uA, and can accurately identify the tiny current of 100uA without destroying the measured current line.

1.      Test Equipment:


             One set high-stability DC power supply, one set high-stability AC power supply, one set oscilloscope, one set multimeter Agilent 34461A, 100 Ohm high-power resistor.


2.      Equipment being tested


             One set of Hangzhi 10mA high precision current transducer, when calibration input 20mA, then output is 2V, the ratio of output voltage and input current is 0.1V/mA.


3.      Test method

             The measured current is outputted by high stability of the power supply. The outputted current flows through the round hole (pore size 26 mm) of Hangzhi precision


             current transducer, and its amplitude is measured by Agilent Multimeter 34461. At the same time, a 100 Ohm sampling resistance is series-connected in the current 


             loop under test, and the voltage waveform of the resistance can be observed through an oscilloscope. 


             The output voltage signal of the transducer is also connected to the oscilloscope through which the relationship between the input current and the output voltage signal of 


             the transducer can be observed. 


             In this experiment, the input AC 50Hz and 1000Hz micro current, as well as the input DC micro current are tested. The test environment and results are shown as follows:



1.      AC small current test waveform


             In the figures shown by the oscilloscope, each waveform represents the following Implication:


i)   Oscilloscope channel 1 (yellow): the waveform after the measured current flows through the resistance, which represents the actual output current of the power supply.


ii)  Oscilloscope channel 2 (green): the output voltage waveform after the measured current flows through the round hole of Hangzhi precision current transducer. The ratio of output voltage and input current is 0.1V/mA.


 


(a) The 20mA(50Hz) AC current flows through the round hole of current transducer, the amplitude of output voltage is 2V, and each cell of the oscilloscope is 5ms. The waveform is as follows:



Fig.2:Input 20mA (50Hz)

(b) The 10mA(50Hz) AC current flow through the round hole of current transducer, the amplitude of output voltage is 1V, and each cell of oscilloscope is 5ms. The waveform is as follows:



Fig.3:Input 10mA(50Hz)

(c) The 5mA(50Hz) AC current flows through the round hole of current sensor, the amplitude of output voltage is 0.5V, and each cell of oscilloscope is 5ms. The waveform is as follows:



Fig. 4:Input 5mA(50Hz)

(d) The 2mA(50Hz) AC current flows through the round hole of current transducer, the amplitude of output voltage is 0.2V, and each cell of oscilloscope is 5ms. The waveform is as follows:



Fig. 5:Input 2mA(50Hz)

 

(e) The 20mA(1000Hz) AC current flows through the round hole of current transducer, the amplitude of output voltage is 2V, and each cell of oscilloscope is 200us. The waveform is as follows:

Fig. 6:Input 20mA(1000Hz)

5.   DC small current test waveform

(a)  The 20mA DC current flows through the round hole of current transducer, the amplitude of output voltage is 2V. The waveform is as follows:



Fig. 7:Input 20mA (DC)

 

(b)  The 10mA DC current flows through the round hole of current transducer, the amplitude of output voltage is 1V. The waveform is as follows:



Fig. 8:Input 10mA (DC)

 

(c) The 5mA DC current flows through the round hole of current transducer, the amplitude of output voltage is 0.5V. The waveform is as follows:



Fig. 9:Input 5mA (DC)

 

(d) The 2mA DC current flows through the round hole of current transducer, the amplitude of output voltage is 0.2V. The waveform is as follows:



Fig. 10:Input 2mA (DC)


6.      Analysis of test results:

By comparing the test results in Fig.2~4, Hangzhi current transducer maintains good linearity and high response speed for the small AC current of 2mA~30mA with small output noise. By comparing the test results in Fig.5~9, Hangzhi current transducer maintains good linearity and high speed for the small DC current of 2mA~20mA with small noise.

At present, the minimum recognition of Hangzhi high-precision micro-current transducer achieved is 10uA, and it can accurately identify the micro current of 100uA, therefore, Hangzhi can realize the high-precision isolation measurement of the micro current without damaging the measured current line.


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