Four-range potentiometer utilizing branch line having four measuring plates
A technology of potentiometer and shunt branch, which is applied in the direction of AC/DC potential difference measuring device, etc.
Inactive Publication Date: 2010-09-15
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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[0011] 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 adjustable resistance RP 3 , then to resistor R 0 , adjustable resistance RP 2 and RP 1 After that, 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 the adjustable resistor RP 3 , and then to the negative pole of the standard battery is the standard circuit. When all four stepping disks are set to "0", the left resistance between the two brushes of the first stepping disk is equal to 2970Ω, and the resistance on the right is equal to 29700Ω. The total resistance between the two brushes of the first stepping disk is 2700Ω, so 10 / 11 of the total current between the tw...
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The invention provides a potentiometer with four measuring discs and diverting branch four range switching for voltage measurement, wherein 20X100 Omega is used as a No:1 measuring disc, 10X11 Omega is used as a No:2 measuring disc, 9-22 Omega is used as a No:3 measuring disc, 10X2.2 Omega is used as a No:2 measuring disc, wherein the on-off switch does not influence measurement result, the twomeasuring junction knobs and the four measuing discs are connected directly with cables, the contact resistance of the measurement step switch, the variable difference and thermoelectrical potential are eliminated outside the measurement result, and the zero potential can further raise negative potential for compensation, in X0.1 measuring range and X0.01measuring range, a common resistance is employed for dividing the current.
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 four step ...
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IPC IPC(8): G01R17/20
Inventor 骆乃光
Owner 骆乃光