CN2363285Y - Digital multimeter with communication table distance-measuring function - Google Patents
Digital multimeter with communication table distance-measuring function Download PDFInfo
- Publication number
- CN2363285Y CN2363285Y CN 98246027 CN98246027U CN2363285Y CN 2363285 Y CN2363285 Y CN 2363285Y CN 98246027 CN98246027 CN 98246027 CN 98246027 U CN98246027 U CN 98246027U CN 2363285 Y CN2363285 Y CN 2363285Y
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- CN
- China
- Prior art keywords
- cable
- measured hole
- utility
- multimeter
- model
- 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
Links
- 238000005259 measurement Methods 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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Abstract
The utility model discloses a digital multimeter which can be used for measuring the length of communication cables. On the basis of the existing digital multimeters, the utility model is additionally provided with a circuit converting unit T, so that the existing digital multimeters have the communication cable distance measuring function, and achieves the goals of fast and accurately looking up the concrete position of broken cables. The utility model is composed of a casing, a transfer switch, a measuring hole and a liquid crystal display. During use, the transfer switch is turned to a communication cable grade, and the value displayed in the liquid crystal display is the physical length of the cable.
Description
The utility model relates to a kind of detecting instrument of telecommunication cable.
Along with the develop rapidly of electronic information, the consumption of telecommunication cable increases year by year, because nature or artificial, the phenomenon that line interruption and cable are stolen happens occasionally.In case cable break is searched ten minutes because of difficulty, does not still have this type of instrument at present and solves this difficult problem.
The purpose of this utility model provides a kind of digital multimeter with distance measurement function, with the on-call maintenance that guarantees circuit with communicate by letter unimpeded.
Scheme of the present utility model is on the basis that keeps the existing digit multimeter, increases by one capacitor's capacity between Capacitance Unbalance in Telecom Cables or loop resistance be converted to the circuit conversion unit T of relevant voltage value, makes the existing digit multimeter possess the telecommunication cable distance measurement function.It comprises compositions such as shell, internal circuit, function switch, LCD, measured hole, battery and cable jack.Its structure is on the top of box-shaped shell LCD to be housed, and the following survey of display is provided with switch, and the switch bottom is provided with measured hole, and the upper right side of measured hole is provided with cable jack.Internal circuit is installed in the inboard of cable jack.Power-supply battery is installed in the inner end of measured hole.
The principle of telecommunication cable distance measurement function is: the telecommunication cable that uses both at home and abroad generally uses unified standard at present, wherein some electrical parameter is basic identical, and the proportionate relationship of basic fixed is all arranged as the capacitance between a pair of cable or loop resitance value and its length.Therefore adopt such electronic circuit, sort circuit can convert the line capacitance capacity of telecommunication cable or resistance and the corresponding magnitude of voltage of its cable length to, this magnitude of voltage is directly shown by the liquid crystal display on the digital watch, the numerical value that this display shows is the physical length of telecommunication cable.
The utility model has the advantages that simple in structurely, easy to use, increase cost hardly, just can make a-table-multi-purpose.
Be described further below in conjunction with accompanying drawing:
Fig. 1 is a digital versatile watch circuit block diagram;
Fig. 2 is the digital multimeter structural representation;
T is for holding the resistance conversion circuit unit among Fig. 1, and its effect is that the line capacitance appearance value of telecommunication cable or resistance are converted to the correspondent voltage value; S is a function switch, when needing to measure, it is turned on " telecommunication cable " gear; D is the multimeter LCDs.
Among Fig. 2, LCD 7 is equipped with on the top of shell 1, and the downside of display is equipped with switch 2, the bottom of switch is provided with measured hole 5, the upper right side of measured hole is provided with cable jack 3, and internal circuit 4 is installed in the inboard of cable jack 3, and power-supply battery 6 is equipped with in the inner end of measured hole.
Another program of the present utility model is not possess the telecommunication cable distance measurement function existing, but have in the digital multimeter of measuring capacitance capacity, can not increase converting unit T, just change in the existing multimeter in the capacitance measurement circuit unit Resistor-Capacitor Unit and adjust the wherein parameter value of element, the displayed value of display screen is consistent with the physical length of telecommunication cable, can becomes the multimeter of telecommunication cable distance measurement function.
Claims (1)
1, a kind of digital multimeter with telecommunication cable distance measurement function, by shell (1), function switch (2), LCD (7), measured hole (5), internal circuit (4), battery (6), cable jack (3) is formed, it is characterized in that: be on the basis that keeps the existing digit multimeter, increase a circuit conversion unit T who capacitor's capacity between telecommunication cable or loop resistance is converted to the relevant voltage value, make the existing digit multimeter possess the telecommunication cable distance measurement function, its hydraulic pressure display (7) is installed in the top of shell (1), switch (2) is located at the downside of display, the bottom of switch is provided with measured hole (5), the upper right side of measured hole is provided with cable jack (3), internal circuit (4) is installed in the inboard of cable jack, and battery (6) is installed in the inner end of measured hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98246027 CN2363285Y (en) | 1998-11-03 | 1998-11-03 | Digital multimeter with communication table distance-measuring function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98246027 CN2363285Y (en) | 1998-11-03 | 1998-11-03 | Digital multimeter with communication table distance-measuring function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2363285Y true CN2363285Y (en) | 2000-02-09 |
Family
ID=33991608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98246027 Expired - Fee Related CN2363285Y (en) | 1998-11-03 | 1998-11-03 | Digital multimeter with communication table distance-measuring function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2363285Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014043592A3 (en) * | 2012-09-14 | 2014-07-31 | Flir Systems, Inc. | Measurement device for electrical installations and related methods |
| US9716843B2 (en) | 2009-06-03 | 2017-07-25 | Flir Systems, Inc. | Measurement device for electrical installations and related methods |
-
1998
- 1998-11-03 CN CN 98246027 patent/CN2363285Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9716843B2 (en) | 2009-06-03 | 2017-07-25 | Flir Systems, Inc. | Measurement device for electrical installations and related methods |
| WO2014043592A3 (en) * | 2012-09-14 | 2014-07-31 | Flir Systems, Inc. | Measurement device for electrical installations and related methods |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |