Check patentability & draft patents in minutes with Patsnap Eureka AI!

Three-measuring range and five-reading DC potential difference meter

A potentiometer and range technology, which is applied in the field of instruments for measuring DC voltage, can solve the problems that the resolution of the potentiometer is as small as 0.1μV and the size of the instrument becomes larger.

Inactive Publication Date: 2008-06-11
骆乃光
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Three-measuring range and five-reading DC potential difference meter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[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 left resistance between the two brushes of the first step disc is 2200Ω, and the right resistance is equal to 22000Ω. The total resistance between the two brushes of the first step disc is 2000Ω, so the first disc 10 / 11 of the total current between the two brushes flows on the left and 1 / 11 on the right. When the second plate thro...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A three-range DC potential difference meter of conversion branch type with five digit reading is composed of three ranges ,three measuring plates of 20*80 omega and 9*17.6omega as well as 10*1.76 omega ,and slide-wire plate of 0-9.68 omega for providing five digit reading .It features that all measuring resistances are connected directly by wires and range conversion resistance value is integer power of one or two digit being multiplied by ten.

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 di...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01R17/20
Inventor 骆乃光
Owner 骆乃光
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com