CN207636643U - Portable calibration grade resistance source - Google Patents
Portable calibration grade resistance source Download PDFInfo
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- CN207636643U CN207636643U CN201721710050.4U CN201721710050U CN207636643U CN 207636643 U CN207636643 U CN 207636643U CN 201721710050 U CN201721710050 U CN 201721710050U CN 207636643 U CN207636643 U CN 207636643U
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Abstract
The utility model discloses a kind of portable calibration grade resistance sources, are related to the offer engineering device technique field of measuring resistance.The resistance source includes shell, it is embedded with usb interface module on the shell, the usb interface module is connected by the USB interface of connecting line and computer, USB power source conversion and data forwarding module and program-controlled resistor module are equipped in the shell, usb interface module is converted with the USB power source and data forwarding module is connect, the USB power source conversion and data forwarding module are connect with the power input of the program-controlled resistor module and control terminal, and the control command that the program-controlled resistor module is used to be passed down according to computer exports the standard electric resistance value of different resistance values.The resistance source has the advantages that small, light-weight, carrying is easy to use.
Description
Technical field
The utility model is related to the offer engineering device technique field of measuring resistance more particularly to a kind of portable calibration grade resistance
Source.
Background technology
In existing electrical quantities measurement verification technical field, the especially military standby measurement verification field of special installing, certain equipment
Carrying calibrating is needed to carry out in-situ test to equipment site with measuring resistance source when calibrating.And existing measuring resistance source body
Product and weight are excessive, it has not been convenient to carry either source the smaller either programmable variation range of covering scope is smaller or source essence
Spend it is relatively low measurement verification rank is not achieved, cannot be satisfied the technical conditions of tested equipment.
Utility model content
Technical problem to be solved in the utility model be how to provide it is a kind of it is small, light-weight, carry it is easy to use
Calibration step voltage source.
In order to solve the above technical problems, technical solution adopted in the utility model is：A kind of portable calibration grade resistance
Source, it is characterised in that：Including shell, usb interface module is embedded on the shell, the usb interface module passes through connecting line
It is connect with the USB interface of computer, being equipped with USB power source for the resistance source to be connect with computer, in the shell converts
And data forwarding module and program-controlled resistor module, usb interface module is converted with the USB power source and data forwarding module is connect,
The USB power source conversion and data forwarding module are used to the power supply that USB interface transmission comes being converted to the program-controlled resistor module
The working power needed, and the control data that usb interface module transmission comes are sent to the program-controlled resistor module, the USB
Power supply is converted and data forwarding module is connect with the power input of the program-controlled resistor module and control terminal, the program-controlled electric
The control command that resistance module is used to be passed down according to computer exports the standard electric resistance value of different resistance values.
Further technical solution is：The resistance source further includes resistance output interface, in the resistance output interface
It is embedding on the housing, and one end of resistance output interface is connect with the output end of program-controlled resistor module.
Further technical solution is：The program-controlled resistor module includes 0.5 Ω -100 Ω resistive modules and 100 Ω
~20M Ω resistive modules, the 0.5 Ω -100 Ω resistive modules are used to export 0-100 according to the control data that computer passes down
The measuring resistance of Ω, the control data that 100 Ω~20M Ω resistive modules are used to be passed down according to computer export 100 Ω~
The measuring resistance of 20M Ω.
Further technical solution is：0.5 Ω -100 Ω the resistive modules include difference amplifier U1-U3, described
Difference amplifier U1-U3 uses AD521 type amplifier chips, and the one of first resistor output interface and second resistance output interface
End is free end, and the other end of first resistor output interface is another through precision resister R0 and the second resistance output interface
End connection, the node of first resistor output interface and the resistance R0 are divided into two-way, the first via through a measuring resistance R with it is described
The output end of difference amplifier U2 connects, and the second tunnel is connect with the inverting input of the difference amplifier U1, and second resistance is defeated
The node of outgoing interface and the resistance R0 are divided into two-way, and the first via is through another measuring resistance R's and difference amplifier U3
Output end connects, and the second tunnel is connect with the in-phase input end of the difference amplifier U1, the output end and journey of the amplifier U1
Control one end connection of variable resistance R6 ', another terminals ground connection of the resistance R6 ', the variable resistance control of the resistance R6 '
End processed is divided into two-way, and the first via is connect with the positive input of the amplifier U2, the forward direction on the second tunnel and the amplifier U3
Input terminal connects, the reverse inter-input-ing ending grounding of the amplifier U2-U3, and the V- of the amplifier U1-U3 terminates VDD, described to put
The V+ of big device U1-U3 terminates VCC, the ends V- and the ends V+ and the corresponding power supply of USB power source conversion and data forwarding module is defeated
Outlet connects；The ends RS, the ends COMP, the ends REF and the ends SEN of the amplifier U1-U3 is the control terminal of amplifier, the amplification
The control terminal of device U1-U3 is converted with USB power source and the corresponding data output end of data forwarding module is connect.
Further technical solution is：100 Ω~20M Ω resistive modules include 3rd resistor output interface,
Four resistance output interfaces, resistance R1- resistance R24 and relay K1-K47, the 3rd resistor output interface and the 4th electricity
The one end for hindering output interface is free end, and the other end of the 3rd resistor output interface is connect with one end of resistance R1, resistance
The other end of R1 is connect after resistance R2- resistance R23 with one end of the resistance R24 successively, the 4th resistance output interface
The other end connect with the other end of the resistance R24, the relay K1 is in parallel with the resistance R1, the relay K25
Termination the 4th resistance output interface and the resistance R24 node, another termination electricity of the relay K25
The node of R1 and resistance R2 are hindered, the relay K2 is in parallel with the resistance R2, a termination the described 4th of the relay K26
The node of resistance output interface and the resistance R24, the knot of another termination the resistance R2 and resistance R3 of the relay K26
Point, and so on, the relay K24 is in parallel with the resistance R24, termination the 4th resistance of the relay K47
The node of output interface and the resistance R24, the knot of another termination the resistance R23 and resistance R24 of the relay K47
Point, the resistance value of the resistance R2 are 2 times of resistance R1 resistance values, and the resistance value of the resistance R3 is 2 times of resistance R2 resistance values, successively class
It pushes away, the resistance value of the resistance R24 is 2 times of resistance R23 resistance values.
Further technical solution is：The computer is laptop or tablet computer.
It is using advantageous effect caused by above-mentioned technical proposal：The resistance source using USB interface and computer into
Row connection, realizes control by computer and takes electricity, is not necessarily to external power supply, and the resistance source need to only be passed through connecting line by when use
I.e. desirable electricity in the USB interface of computer is accessed, USB interface is used in combination to control output resistance amount.The resistance source is using miniaturization
Reduced Design, the measuring resistance source resistance value output area are：0.5 Ω~20M Ω, the least resolution under small resistance value state：10m
Ω。
Compared with prior art, the resistance source is because of the battery module built in not using so that and it is small, light-weight, it can
It realizes the design of palm grade, carries easy to use, direct connection when use, take electricity to be used as own power source from USB interface of computer, utilize meter
Calculation machine programming software can be automatically controled external output resistance, can optimize measurement verification operating process in this way, it is easier to grasp
Control reduces Portable device quantity and weight.
In addition, the resistance generative circuit sampling compared with low resistance is realized in the resistance source in the way of resistance simulation device
Program-controlled resistor exports, and the modes of improved 8421 coding are used for higher resistance value resistance, using less device obtain compared with
High-resolution, it is easy to control.
Description of the drawings
Utility model will be further described in detail below with reference to the attached drawings and specific embodiments.
Fig. 1 is the structural schematic diagram in resistance source described in the utility model embodiment；
Fig. 2 is the circuit diagram of 0.5 Ω -100 Ω resistive modules described in the utility model embodiment；
Fig. 3 is the circuit diagram of 100 Ω described in the utility model embodiment~20M Ω resistive modules；
Wherein：1, shell 2, usb interface module 3, USB power source conversion and data forwarding module 4, program-controlled resistor module 5, electricity
Hinder output interface.
Specific implementation mode
With reference to the attached drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out clear
Chu is fully described by, it is clear that and described embodiment is only a part of the embodiment of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
The every other embodiment obtained, shall fall within the protection scope of the present invention.
Many details are elaborated in the following description in order to fully understand the utility model, but this practicality is new
Type can also be implemented using other different from other manner described here, and those skilled in the art can be without prejudice to this reality
With doing similar popularization in the case of novel intension, therefore the utility model is not limited by following public specific embodiment.
As shown in Figure 1, the utility model embodiment discloses a kind of portable calibration grade resistance source, including shell 1, it is described
Usb interface module 2 is embedded on shell 1, the usb interface module 2 is connected by the USB interface of connecting line and computer, is used
It is connect with computer in by the resistance source.USB power source conversion and data forwarding module 3 and program-controlled electric are equipped in the shell 1
Module 4 is hindered, usb interface module 2 is converted with the USB power source and data forwarding module 3 is connect, the USB power source conversion and number
It is used to the power supply that the transmission of usb interface module 2 comes being converted to the work electricity that the program-controlled resistor module 4 needs according to forwarding module 3
Source, and the control data that the transmission of usb interface module 2 comes are sent to the program-controlled resistor module 4.USB power source conversion and
Data forwarding module 3 is connect with the power input of the program-controlled resistor module 4 and control terminal, the program-controlled resistor module 4
Control command for being passed down according to computer exports the standard electric resistance value of different resistance values, it is preferred that the computer is notes
The portable computer such as this computer or tablet computer.
The resistance source is attached using USB interface with computer, is realized control by computer and is taken electricity, without outer
Connect power supply, when use, which only need to be accessed in the resistance source by connecting line in the USB interface of computer, can use electric, and USB is used in combination
Interface Controller output resistance amount.The resistance source is using miniaturization Reduced Design, the measuring resistance source resistance value output area：
0.5 Ω~20M Ω, the least resolution under small resistance value state：10mΩ.
Further as shown in Figure 1, the resistance source is connect with other devices for convenience, the resistance source further includes electricity
Output interface 5 is hindered, the resistance output interface 5 is embedded on the shell 1, and one end of resistance output interface 5 and program-controlled electric
The output end connection of module 4 is hindered, the device that the other end of resistance output interface 5 is connect with needs connects.
Further, the program-controlled resistor module includes 0.5 Ω -100 Ω resistive modules and 100 Ω~20M Ω resistance
Module, the standard electric for the control data output 0-100 Ω that the 0.5 Ω -100 Ω resistive modules are used to be passed down according to computer
Resistance, 100 Ω~20M Ω resistive modules are used to export the standard of 100 Ω~20M Ω according to the control data that computer passes down
Resistance.
As shown in Fig. 2, the 0.5 Ω -100 Ω resistive modules include difference amplifier U1-U3, the difference amplifier
U1-U3 uses AD521 type amplifier chips, and one end of first resistor output interface and second resistance output interface is freely
End, the other end of first resistor output interface are connect through precision resister R0 with the other end of the second resistance output interface,
First resistor output interface and the node of the resistance R0 are divided into two-way, and the first via is put through a measuring resistance R with the difference
The output end connection of big device U2, the second tunnel are connect with the inverting input of the difference amplifier U1, second resistance output interface
It is divided into two-way, output end of the first via through another measuring resistance R Yu the difference amplifier U3 with the node of the resistance R0
Connection, the second tunnel are connect with the in-phase input end of the difference amplifier U1, the output end and Programmable and Variable of the amplifier U1
One end of resistance R6 ' connects, another terminals ground connection of the resistance R6 ', the variable resistance control terminal point of the resistance R6 '
For two-way, the first via is connect with the positive input of the amplifier U2, the positive input on the second tunnel and the amplifier U3
The V- of connection, the reverse inter-input-ing ending grounding of the amplifier U2-U3, the amplifier U1-U3 terminates VDD, the amplifier U1-
The V+ of U3 terminates VCC, the ends V- and the ends V+ and connects to the corresponding power output end of USB power source conversion and data forwarding module
It connects；The ends RS, the ends COMP, the ends REF and the ends SEN of the amplifier U1-U3 is the control terminal of amplifier, the amplifier U1-
The control terminal of U3 is converted with USB power source and the corresponding data output end of data forwarding module is connect.
0.5 Ω -100 Ω the resistive modules use the mentality of designing of resistance generator, and the groundwork of the circuit is former
Reason is：For measured resistance in acceptance test, the constant current for necessarily having measuring apparatus application flows through measured resistance, due to described
The other parts of the 0.5 Ω -100 Ω resistive modules form feedback loop, are shunted to the electric current, to make to flow through ginseng
The proportional reduction of electric current for examining resistance reaches the lower requirement of resistance value, and the precision of the 0.5 Ω -100 Ω resistive modules is most
The precision and stability of each feedback resistance are depended on eventually, it is outstanding in selection（Extremely low noise low maladjustment voltage amplifier, advanced accurate mark
Quasi- resistance）In the case of can reach very high precision.Its resolution ratio is finally decided by the resolution ratio of variable resistances by program controlling R6 '.
Variable resistances by program controlling R6 ' resistance values are slightly larger, and can reduce switch internal resistance caused by circuit using conventional disconnecting switch mode influences.
The module is tested on current direction because of the form using difference channel at positive and negative two kinds unlike common resistance generator
The function of low resistance generator can be achieved.
As shown in figure 3,100 Ω~20M Ω resistive modules include 3rd resistor output interface, the 4th resistance output connect
Mouth, resistance R1- resistance R24 and relay K1-K47.The 3rd resistor output interface and the 4th resistance output interface
One end is free end, and the other end of the 3rd resistor output interface is connect with one end of resistance R1, the other end of resistance R1 according to
It is secondary to be connect with one end of the resistance R24 after resistance R2- resistance R23, the other end of the 4th resistance output interface and institute
The other end connection of resistance R24 is stated, the relay K1 is in parallel with the resistance R1, described in a termination of the relay K25
The node of 4th resistance output interface and the resistance R24, another termination resistance R1 and resistance R2 of the relay K25
Node, the relay K2 is in parallel with the resistance R2, termination a 4th resistance output interface of the relay K26
With the node of the resistance R24, the node of another termination the resistance R2 and resistance R3 of the relay K26, and so on,
The relay K24 is in parallel with the resistance R24, a termination the 4th resistance output interface of the relay K47 and institute
State the node of resistance R24, the node of another termination the resistance R23 and resistance R24 of the relay K47, the resistance R2
Resistance value be 2 times of resistance R1 resistance values, the resistance value of the resistance R3 is 2 times of resistance R2 resistance values, and so on, the resistance
The resistance value of R24 is 2 times of resistance R23 resistance values.
100 Ω~20M Ω resistive modules are by controlling relay（One or more of relay K1-K47）'s
It opens or ends, realize the resistance of different resistance values（One or more of resistance R1- R24）It is connected in series with, is made described
100 Ω~20M Ω resistive modules export different standard electric resistance values as needed.It is set in 100 Ω~20M Ω resistive modules
Resistance direct short-circuit relay is counted（K1-K24）, low resistance uncertainty is made with reducing multiple relay contacts resistance series connection
At influence, further increase the circuit low state precision.
Claims (6)
1. a kind of portable calibration grade resistance source, it is characterised in that：Including shell（1）, the shell（1）On be embedded with USB and connect
Mouth mold block（2）, the usb interface module（2）It is connected, is used for the resistance source by the USB interface of connecting line and computer
It is connect with computer, the shell（1）It is interior to be equipped with USB power source conversion and data forwarding module（3）With program-controlled resistor module（4）,
Usb interface module（2）With USB power source conversion and data forwarding module（3）Connection, the USB power source conversion and data turn
Send out module（3）For by usb interface module（2）The power supply that transmission comes is converted to the program-controlled resistor module（4）The work needed
Power supply, and by usb interface module（2）The control data that transmission comes are sent to the program-controlled resistor module（4）, the USB power source
Conversion and data forwarding module（3）With the program-controlled resistor module（4）Power input and control terminal connection, it is described program-controlled
Resistive module（4）Control command for being passed down according to computer exports the standard electric resistance value of different resistance values.
2. portable calibration grade resistance source as described in claim 1, it is characterised in that：The resistance source further includes resistance output
Interface（5）, the resistance output interface（5）It is embedded in the shell（1）On, and resistance output interface（5）One end with it is program-controlled
Resistive module（4）Output end connection.
3. portable calibration grade resistance source as described in claim 1, it is characterised in that：The program-controlled resistor module includes 0.5
Ω -100 Ω resistive modules and 100 Ω~20M Ω resistive modules, the 0.5 Ω -100 Ω resistive modules are used for according to calculating
The measuring resistance for the control data output 0-100 Ω that machine passes down, 100 Ω~20M Ω resistive modules are used for according to computer
The measuring resistance of the control data output 100 Ω~20M Ω passed down.
4. portable calibration grade resistance source as claimed in claim 3, it is characterised in that：0.5 Ω -100 Ω the resistive modules
Including difference amplifier U1-U3, the difference amplifier U1-U3 uses AD521 type amplifier chips, first resistor output interface
And one end of second resistance output interface is free end, the other end of first resistor output interface is through precision resister R0 and institute
The other end connection of second resistance output interface is stated, first resistor output interface and the node of the resistance R0 are divided into two-way, the
It is connect all the way with the output end of the difference amplifier U2 through a measuring resistance R, the second tunnel is with the difference amplifier U1's
Inverting input connects, and second resistance output interface and the node of the resistance R0 are divided into two-way, and the first via is through another standard
Resistance R is connect with the output end of the difference amplifier U3, and the second tunnel is connect with the in-phase input end of the difference amplifier U1,
The output end of the amplifier U1 is connect with one end of variable resistances by program controlling R6 ', another wiring termination of the resistance R6 '
The variable resistance control terminal on ground, the resistance R6 ' is divided into two-way, and the first via is connect with the positive input of the amplifier U2,
Second tunnel is connect with the positive input of the amplifier U3, the reverse inter-input-ing ending grounding of the amplifier U2-U3, the amplification
The V- of device U1-U3 terminates VDD, the V+ of the amplifier U1-U3 terminate VCC, the ends V- and the ends V+ converted with USB power source and
The corresponding power output end of data forwarding module connects；The ends RS, the ends COMP, the ends REF and the ends SEN of the amplifier U1-U3
Control terminal for the control terminal of amplifier, the amplifier U1-U3 is converted with USB power source and the corresponding data of data forwarding module
Output end connects.
5. portable calibration grade resistance source as claimed in claim 3, it is characterised in that：100 Ω~20M Ω resistive modules
Including 3rd resistor output interface, the 4th resistance output interface, resistance R1- resistance R24 and relay K1-K47, described
One end of three resistance output interfaces and the 4th resistance output interface is free end, the other end of the 3rd resistor output interface
It is connect with one end of resistance R1, the other end of resistance R1 connects after resistance R2- resistance R23 with one end of the resistance R24 successively
It connects, the other end of the 4th resistance output interface is connect with the other end of the resistance R24, the relay K1 and the electricity
Hinder that R1 is in parallel, the node of termination the 4th resistance output interface and the resistance R24 of the relay K25, it is described after
The node of another termination the resistance R1 and resistance R2 of electric appliance K25, the relay K2 is in parallel with the resistance R2, it is described after
The node of termination the 4th resistance output interface and the resistance R24 of electric appliance K26, the other end of the relay K26
The node of the resistance R2 and resistance R3 are connect, and so on, the relay K24 is in parallel with the resistance R24, the relay
The node of termination the 4th resistance output interface and the resistance R24 of K47, another termination institute of the relay K47
The node of resistance R23 and resistance R24 are stated, the resistance value of the resistance R2 is 2 times of resistance R1 resistance values, and the resistance value of the resistance R3 is
2 times of resistance R2 resistance values, and so on, the resistance value of the resistance R24 is 2 times of resistance R23 resistance values.
6. portable calibration grade resistance source as described in claim 1, it is characterised in that：The computer be laptop or
Tablet computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721710050.4U CN207636643U (en) | 2017-12-11 | 2017-12-11 | Portable calibration grade resistance source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721710050.4U CN207636643U (en) | 2017-12-11 | 2017-12-11 | Portable calibration grade resistance source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207636643U true CN207636643U (en) | 2018-07-20 |
Family
ID=62862137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721710050.4U Active CN207636643U (en) | 2017-12-11 | 2017-12-11 | Portable calibration grade resistance source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207636643U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110865325A (en) * | 2019-11-17 | 2020-03-06 | 北京东方计量测试研究所 | Calibration device and calibration method of instantaneous interruption tester |
-
2017
- 2017-12-11 CN CN201721710050.4U patent/CN207636643U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110865325A (en) * | 2019-11-17 | 2020-03-06 | 北京东方计量测试研究所 | Calibration device and calibration method of instantaneous interruption tester |
| CN110865325B (en) * | 2019-11-17 | 2022-03-04 | 北京东方计量测试研究所 | Calibration device and calibration method of instantaneous interruption tester |
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