CN201096841Y - A multimeter for accurate online measuring of part resistance - Google Patents
A multimeter for accurate online measuring of part resistance Download PDFInfo
- Publication number
- CN201096841Y CN201096841Y CNU2007201706296U CN200720170629U CN201096841Y CN 201096841 Y CN201096841 Y CN 201096841Y CN U2007201706296 U CNU2007201706296 U CN U2007201706296U CN 200720170629 U CN200720170629 U CN 200720170629U CN 201096841 Y CN201096841 Y CN 201096841Y
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- CN
- China
- Prior art keywords
- multimeter
- resistance value
- measurement point
- under test
- resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
The utility model provides a multi-meter in which the precise inline measurement of the device resistance value can be proceeded, which comprises a constant voltage source that one end is linked with a measuring point A, and an ammeter in series connection with the constant voltage source that one end is linked with a measuring point B. Between the constant voltage source and the ammeter, a measuring pin is arranged to be taken as a measuring point C. When in use, the measuring point A is connected to one end of the measured device, and the measuring point B is connected to the other end of the measured device. The measuring point C is connected to the end of the resistance in series connection with the measured device. Through an additional measuring pin i.e. the measuring point C provided between the constant voltage source and the ammeter, the inline measurement of the device resistance value is achieved. Therefore, the usefulness and convenience of the multi-meter are increased.
Description
Technical field
The utility model belongs to the technology of instrument and meter field, relate in particular to a kind of can be accurately at the multimeter of drive test measuring device spare resistance value.
Background technology
Multimeter also claims avometer, can measuring voltage, electric current and resistance since its have conveniently, multifunctionality, in the research of electron trade, production run, be extensive use of.When using traditional multimeter to measure the resistance value of a device in the loop, common way is this device under test and its peripheral circuit to be disconnected measure, and uses very inconvenience like this.Be illustrated in figure 1 as the cardinal principle of resistance grade survey device resistance value resistance on the present use multimeter, use constant pressure source that voltage U is provided, measurement point A, B are added in device under test R two ends respectively, can read the electric current I that flows through device under test R by reometer, can draw R=U/I according to Ohm law, but when in circuit loop, measuring the resistance value of individual devices, device under test and its peripheral circuit need be disconnected measurement.As shown in Figure 2, during measuring element R resistance value, need that R and R1 and R2 disconnection after the disconnection, are had only a loop in this circuit, promptly I can accurately measure the resistance value of device under test R from H → A → B → G; If do not disconnect, two loops are then arranged, as shown in Figure 3: I in the circuit
1From H → A → B → G; I
2From H → A → D → E → C → B → G, flow through the electric current I=I of reometer
1+ I
2, and the electric current that flows through on the device under test R is I
1, the voltage that is added on the R is U, can't measure the resistance value of R.
The utility model content
The purpose of this utility model be to provide a kind of easy to use can be accurately at the multimeter of drive test measuring device spare resistance value.
Technical solutions of the utility model be achieved in that a kind of can be accurately at the multimeter of drive test measuring device spare resistance value, include the reometer that an end is connected with measurement point A constant pressure source, connects with constant pressure source, reometer one end is connected with measurement point B, be provided with one between constant pressure source and the reometer and measure pin, be measurement point C.
Compared to prior art, this creation is measured pin by will increase by one between constant pressure source and reometer, and promptly measurement point C has realized having increased the practicality and the convenience of multimeter in drive test examination device resistance value.
Description of drawings
Fig. 1 is the circuit theory diagram that the prior art multimeter is surveyed single resistance;
Fig. 2 is the synoptic diagram that the prior art multimeter is measured resistance in the cutoff circuit;
Fig. 3 is a synoptic diagram of surveying resistance in the cutoff circuit not with the prior art multimeter;
Fig. 4 is this creation multimeter schematic diagram;
Fig. 5 is the synoptic diagram with resistance in this creation multimeter survey time road;
Fig. 6 is another diagram with resistance in this creation multimeter survey time road.
Embodiment
Please refer to shown in Figure 4, this creation a kind of can be accurately at the multimeter of drive test measuring device spare resistance value, include the constant pressure source that an end is connected with measurement point A, the reometer of connecting with constant pressure source, reometer one end is connected with measurement point B, lead to one between constant pressure source and the reometer and measure pin, as measurement point C.
When measuring the resistance value of individual devices independently, only need to use measurement point A and B, measuring method is same as the prior art, so repeat no more; And when measuring the resistance value of the device in the loop, measuring method is added in measurement point A, measurement point B respectively the two ends of device under test R as shown in Figure 5, and the 3rd measurement point C is added in resistance R 1 other end of connecting with device under test, at this moment, two loops, wherein I are arranged in this circuit
1From H → A → B → G, and I
2From H → A → D → E → C → F → G, the electric current that flow through reometer this moment has only I
1, the electric current that flow through device under test this moment also has only I
1, I
2Through directly getting back to voltage source behind the R2, so the R=U/I that measures through CFG
1, can accurately measure the resistance value of device under test R.
In the practical application, the resistance of connecting with device under test has more than and is limited to individual devices, also can be the circuit that several components and parts are formed, and the equivalent resistance etc. of this circuit was all the resistance of connecting with device under test and got final product this moment; In like manner the R2 in the loop has more than and is limited to individual devices, also can be the circuit that several components and parts are formed, and R2 is the equivalent resistance of this circuit, and as shown in Figure 6, circuit one in the circuit in device under test R and the frame of broken lines and the circuit two in the solid box are cascaded.At this moment, the circuit one that is cascaded with device under test R is composed in parallel by n device, when measuring the resistance value of device under test R, isolating points C can be extended and become 1,2,3 ... n point, respectively with n the device isolation that is connected in parallel, make the electric current that flows through circuit one and circuit two without reometer, thereby do not influence the resistance value of measuring device under test R, this circuit promptly is equivalent to circuit shown in Figure 5.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (3)
- One kind can be accurately at the multimeter of drive test measuring device spare resistance value, include the constant pressure source that an end is connected with measurement point A, the reometer of connecting with constant pressure source, reometer one end is connected with measurement point B, it is characterized in that: be provided with one between constant pressure source and the reometer and measure pin, as measurement point C.
- 2. as claimed in claim 1 can be accurately at the multimeter of drive test measuring device spare resistance value, it is characterized in that: described measurement point A connects an end of device under test, measurement point B connects the other end of device under test, and measurement point C connects resistance one end of connecting with device under test.
- 3. as claimed in claim 2 can it is characterized in that accurately at the multimeter of drive test measuring device spare resistance value: the resistance of connecting with described device under test is the circuit that a plurality of devices are formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201706296U CN201096841Y (en) | 2007-11-09 | 2007-11-09 | A multimeter for accurate online measuring of part resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201706296U CN201096841Y (en) | 2007-11-09 | 2007-11-09 | A multimeter for accurate online measuring of part resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201096841Y true CN201096841Y (en) | 2008-08-06 |
Family
ID=39923894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201706296U Expired - Fee Related CN201096841Y (en) | 2007-11-09 | 2007-11-09 | A multimeter for accurate online measuring of part resistance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201096841Y (en) |
-
2007
- 2007-11-09 CN CNU2007201706296U patent/CN201096841Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080806 Termination date: 20161109 |