Electric potential difference meter of three measuring range conversion using converter branch having five digit reading
A potentiometer and range conversion technology, which is applied in the direction of AC/DC potential difference measurement devices, etc., can solve the problems of increasing the size of the instrument and the resolution of the potentiometer being as small as 0.1μv.
Inactive Publication Date: 2006-06-28
骆乃光
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Problems solved by technology
[0002] For the currently produced potentiometer, when there are more than three measuring discs, there will be switch contact resistance and variation between the two measuring terminals. Therefore, even if the working current is as small as 0.1mA, the brushes and contacts of the switch are not only made of silver copper. Composite materials, the contact area is also made quite large to reduce the impact of the variation of the measurement switch when switching step by step, which makes the volume of the instrument larger. Even so, the resolution of the potentiometer cannot be made as small as 0.1μv. In addition, there is also the influence of the thermoelectric potential of the switch and the variable thermoelectric potential of the contact.
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[0007] by "U x "The positive electrode passes through each measuring disc, and then passes through the switch K 2 to "U x "The negative pole is the measurement circuit, from the positive pole of the power supply through the measurement step switch to the setting resistance RN and RP 3 , then to resistor R 0 , adjustable resistor RP 2 and RP 1 Finally, back to the negative pole of the power supply is the working circuit, from the positive pole of the standard battery EN through the switch K 2 , to the setting resistor RN and RP 3 , and then to the negative pole of the standard battery is the standard circuit. When all four discs throw "0", the resistance on the left side between the two brushes of the first stepping disc is 1100Ω, and the resistance on the right is equal to 11000Ω. The total resistance between the two brushes of the first stepping disc is 1000Ω, so the first disc 10 / 11 of the total current between the two brushes flows on the left and 1 / 11 on the right. ...
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A three¿Crange switching potential difference meter with five digit reading and applying transposition branch is composed of three ranges and three measuring discs of 18x 50 omega, 9x 11 omega and 10x 1.1 omega as well as a slide wire disc of 0 ¿C 6.05 omega for providing five digit reading; connecting all measuring discs directly by conducting wire to exclude contact resistance and variation from measuring ¿C stepping switch out of measuring result; using integer power of one or two digit number multiplying by ten as value of resistance being used for range changeover.
Description
technical field [0001] The invention relates to an instrument for measuring DC voltage. Background technique [0002] For the currently produced potentiometer, when there are more than three measuring discs, there will be switch contact resistance and variation between the two measuring terminals. Therefore, even if the working current is as small as 0.1mA, the brushes and contacts of the switch are not only made of silver copper. Composite materials, the contact area is also made quite large to reduce the impact of the variation of the measurement switch when switching step by step, which makes the volume of the instrument larger. Even so, the resolution of the potentiometer cannot be made as small as 0.1μv. In addition, there is also the influence of the thermoelectric potential of the switch and the variable thermoelectric potential of the contact. Contents of the invention [0003] The problem to be solved by the present invention is that when there are three step dis...
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Inventor 骆乃光
Owner 骆乃光