Two-range potentiometer having five measurement disks and employing transposition branch
A potentiometer and measuring disc technology, 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: 2008-02-27
骆乃光
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Problems solved by technology
[0002] For the potentiometer currently produced, 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 small To 0.1mA, the brushes and contacts of the switch are not only made of silver-copper composite materials, but the contact area is also made quite large to reduce the impact of the measurement switch step change, which makes the volume of the instrument larger, even if In this way, the resolution of the potentiometer cannot be made as small as 0.1μV, and 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] In the figure, represented 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 the temperature compensation plate RP 4 , then to resistor R 0 , adjustable resistor RP 3 、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 resistance RN and the temperature compensation plate RP 4 , and then to the negative pole of the standard battery is the standard circuit. When all five discs throw "0", the left resistance between the two brushes of the first step disc is equal to 330Ω, and the right resistance is equal to 3300Ω. The total resistance between the two brushes of the first step disc is 300 total Ω, so the first step d...
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The invention provides a potentiometer with five measuring discs and shift branch double range switching for DC voltage measurement, wherein 20X10 Omega is used as a No:1 measuring disc, 9X2.2 Omega is used as a No:2, 3 measuring disc, 10X0.022 Omega is used as a No:4, 5 measuring disc, all the measuring resistors are connected with wires, thus good repeatability can be achieved even the minimum resolution is 0.1 uV, according to the invention, the resistance for range switching is the arithmetic product of a uni-digit or bi-digit and the integral power of 10.
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 five step swi...
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IPC IPC(8): G01R17/20
Inventor 骆乃光
Owner 骆乃光