UGN350lT is a commonly used three-terminal linear Hall element. It consists of a voltage regulator, a Hall generator and an amplifier. With the UGN350lT, it is very convenient to form a Gauss meter. Its use is very simple, first make B=0, record the value of VOH in the table below, then stick the probe end face on the object to be tested, and write down the new indication value VOH1.
ΔVOH=VOH1-VOH
If ΔVOH "0", it means that the end face of the probe is measured as the N pole; otherwise, it is the S pole. The sensitivity of the UGN3501T is 7V/T, so that the corresponding measured magnetic induction B can be measured.
If a digital voltmeter (DVM) is used, the linear Gauss meter shown in Figure 1 can be obtained. The op amp uses the high-precision op amp CA3130. The specific zero adjustment mode of the circuit is: after turning on the power, let B=0, adjust W1 to make the value of DVM zero, and then attach a standard bismuth aluminum boron magnetic steel (B=0.1T) to the end face of the probe. Adjust W2 so that the DVM can be displayed as 1V. If the indication value of the Gauss meter is -200mV, the end face of the probe is detected as the S pole, and the magnetic field strength is 0.02T. The Gauss meter can also be used to measure alternating magnetic fields, but the DVM should be changed to an AC voltmeter. It is obvious that the function of the conventional digital multimeter can be easily extended by using the circuit of Fig. 1.
The UGN3501T can also be used to form a clamp-type ammeter as shown in Figure 2. The Hall element is placed in the gap of the clamped cold-rolled silicon steel sheet. When a current flows through the wire, a magnetic field is generated in the clamp ring, the magnitude of which is proportional to the number of ampoules flowing through the wire current; this magnetic field Acting on the Hall element, the corresponding Hall potential is induced, and its sensitivity is 7V/T. After the op amp μA741 is zeroed, it is linearly amplified and sent to the DVM to form a digital clamp-type ammeter. The debugging of this table is also very simple: when the current in the wire is zero, adjust W1 and W2 to make the value of DVM zero. Then input 50A of current, adjust W3 to make DVM read 5V; reverse input -50A current, the number indicates -5V. Repeatedly adjust W1, W2, W3, the reading can meet the requirements. This clamp-type ammeter has been tested and its sensitivity is not less than 0.1V/A. Similarly, this ammeter can also be used for AC current measurement. It is convenient to replace DVM with AC voltmeter.
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