CN2196308Y - Portable pointer universal avometer with function of measuring frequency - Google Patents
Portable pointer universal avometer with function of measuring frequency Download PDFInfo
- Publication number
- CN2196308Y CN2196308Y CN 94204431 CN94204431U CN2196308Y CN 2196308 Y CN2196308 Y CN 2196308Y CN 94204431 CN94204431 CN 94204431 CN 94204431 U CN94204431 U CN 94204431U CN 2196308 Y CN2196308 Y CN 2196308Y
- Authority
- CN
- China
- Prior art keywords
- frequency
- avometer
- multimeter
- function
- pointer
- 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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Abstract
The utility model relates to a portable pointer universal avometer with the function of measuring frequency, on the basis of the ordinary pointer avometer, the utility model is additionally provided with a shaping and amplifying circuit, a frequency divider, a converting switch, etc., and thus the avometer has the function of measuring frequency with little change of the internal circuit of the original avometer. The utility model can be allocated with an output driver, an oscillator, etc. to be served as a square signal generator, and the function of the utility model is expanded with strong practicability the pointer avometer simple circuits, low price, portability and easy maintenance, volume, weight or peripheral mechanism.
Description
The utility model relates to a kind of electronic measuring instrument, particularly a kind of pointer multimeter.
The pointer multimeter of Shi Yonging in the past, compare with digimer have low price, characteristics that circuit structure is simple, easy to maintenance.But in today of digital circuit and pulsing circuit widespread use, the measurement of frequency or the use of square-wave signal source are become frequent day by day, and existing general portable pointer multimeter does not possess these functions, pointer multimeter is used still be subjected to great limitation.Though there are some to possess the pointer multimeter of frequency measurement or square wave signal generator function through change, but they complicate the structure of pointer multimeter, element increases, volume increases, and some also will add the peripheral hardware annex, has lost characteristics simple, portable, that be easy to repair.
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art part and provides a kind of circuit simple, keeps the portable pointer multimeter that original function and characteristics have the frequency measurement function again.
The purpose of this utility model is achieved by the following technical solution: the portable pointer multimeter with frequency measurement function, comprise gauge outfit, internal circuit, test pencil, internal electric source of conventional pointer multimeter etc., the signal input part of internal circuit is connected to a shaping amplifier, the output terminal of shaping amplifier links to each other with the input of frequency divider, and the output of frequency divider is connected with gauge outfit through the frequency division selector switch.Be connected to a switch between the signal input part of internal circuit or shift switch and the shaping amplifier, stir switch, can select different duties.When selecting frequency measurement, pulse signal is imported by test pencil, through switch input shaper amplifier, pulse signal through shaping and amplification is sent into frequency divider, frequency divider is generally many grades very frequently, low frequency pulse signal behind frequency division is sent into the gauge outfit of multimeter by the frequency division selector switch, drives the beat of pointer.When the frequency of selected fractional frequency signal is higher, the pointer of gauge outfit is transfixion because vibration frequency is too high, the class that optional divide ratio is bigger, can debate not clear until the swing of meter pointer, note the frequency of the multimeter beat of pointer, multiply by divide ratio again, can roughly measure the frequency of pulse signal.
The utility model is on the basis of original common pointer multimeter, and newly-increased circuit merging forms, and keeps original internal circuit, does not change substantially.Both kept the inner original function of multimeter, volume is little, is easy to carry, and has the function that the frequency of utilizing the meter pointer swing shows the measured signal frequency again.Make the purposes of pointer multimeter more extensive.
Fig. 1 is a circuit block diagram of the present utility model;
Fig. 2 is an electrical schematic diagram of the present utility model.
Below in conjunction with drawings and Examples the utility model is further elaborated.
Embodiment one:
See figures.1.and.2, present embodiment is on the basis of MF-47 type pointer multimeter, increases the circuit that connects shaping amplifier, ten frequency dividers etc. and realizes the frequency measurement function.Newly-increased circuit is serially connected on the multimeter direct current 10V shelves, and for not influencing the measurement function of direct current 10V shelves, the input end of newly-increased circuit is connected to third gear open and shut valve K
1, output terminal is connected to frequency division selector switch K
2Work as K
1Be allocated to " a " " a ' ", K
2When being allocated to " 1 ", measuring-signal passes through K switch
1, K
2Return in the multimeter, multimeter is measured state for direct current 10V.
Work as K switch
1Be allocated to " b " and " b ' ", K
2Be allocated to " 2 "-during " 6 " arbitrary retaining, multimeter is the frequency measurement state.From the high-frequency pulse signal to be measured of test pencil input through K
1" b " send into by resistance R
1-R
3, capacitor C
1-C
2, triode BG
1, BG
2The shaping amplifier of forming, output signal is through Sheffer stroke gate F
3, F
4Further input 6 grade of ten frequency divider (CM4518) after the shaping, the operating voltage of frequency divider by the multimeter internal electric source through K
1" b " and diode D
5Provide; The operating voltage of shaping amplifier equally by internal electric source through K
1" b ' " be added to resistance R
2, R
3Parallel connected end.6 groups of low frequency pulse signals through the frequency divider frequency division pass through resistance R respectively
13-R
17And frequency division selector switch K
2In the corresponding arbitrary shelves in " 2 "-" 6 " deliver to the gauge outfit of multimeter, read the hunting frequency of meter pointer, multiply by frequency division selector switch K
2Last corresponding divide ratio can be measured the frequency of input pulse signal.
Embodiment two:
Consider that except the measurement of frequency the generation of square-wave signal also is a measurement function commonly used.And general square wave signal generator volume is big, heavy, is not easy to carry, and brings some inconvenience for the detection of circuit, maintenance.Present embodiment utilizes frequency divider on the basis that possesses the frequency measurement function, increase an oscillator and output driver, makes the pointer multimeter also possess the function of square wave signal generator.
See figures.1.and.2, the circuit of the frequency measurement part of present embodiment is identical with embodiment one, and just the signal input part at frequency divider (CM4518) also is connected to by resistance R
8-R
10, capacitor C
3, Sheffer stroke gate F
1-F
4(CM4011) the impedance type ring oscillator of Zu Chenging; The output terminal of frequency divider is through frequency division selector switch K
2One the road inserts the multimeter gauge outfit, and another road connects by resistance R
5-R
7Triode BG
3, BG
4, diode D
4With stabilivolt D
3The input end of the output driver that constitutes, the output terminal of output driver is through the stabilivolt D of parallel connection
2(3.5-5V) and D
7(9-10V), K switch
1" C " be connected with the multimeter test pencil.Work as K
1When being allocated to " C " and " C ' ", multimeter is a square-wave signal generation state.The multimeter internal electric source is through K switch
1" C ' " pass through resistance R
5Provide operating voltage to output driver; Pass through resistance R
8Provide operating voltage to oscillator.The operating voltage of frequency divider is then through diode D
6Provide.The high-frequency square-wave signal that oscillator produces is divided into 6 groups of different low-frequency square-wave signals through frequency divider, by frequency division selector switch K
2, the one tunnel sends into the multimeter gauge outfit shows; Another road is exported by test pencil through output driver.Select frequency division selector switch K
2The different shelves in " 2 "-" 6 ", test pencil is promptly exported the square-wave signal of different frequency (0.1Hz-1KHz).In the present embodiment, the impedance type ring oscillator also can adopt conventional crystal oscillator to substitute and produce high-frequency square-wave signal.
Claims (3)
1, a kind of portable pointer multimeter with frequency measurement function, comprise gauge outfit, internal circuit, test pencil, internal electric source of conventional pointer multimeter etc., it is characterized in that: the signal input part of internal circuit is connected to a shaping amplifier, the output terminal of shaping amplifier links to each other with the input of frequency divider, and the output of frequency divider is connected with gauge outfit through the frequency division selector switch.
2, multimeter according to claim 1 is characterized in that the input end of frequency divider also is connected to an oscillator, and the output of frequency divider another road behind step switch is connected with output driver, and the output driver output terminal is connected with test pencil.
3, multimeter according to claim 2 is characterized in that oscillator can adopt impedance type ring oscillator or crystal oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94204431 CN2196308Y (en) | 1994-02-24 | 1994-02-24 | Portable pointer universal avometer with function of measuring frequency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94204431 CN2196308Y (en) | 1994-02-24 | 1994-02-24 | Portable pointer universal avometer with function of measuring frequency |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2196308Y true CN2196308Y (en) | 1995-05-03 |
Family
ID=33823668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94204431 Expired - Fee Related CN2196308Y (en) | 1994-02-24 | 1994-02-24 | Portable pointer universal avometer with function of measuring frequency |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2196308Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101247614B (en) * | 2008-03-22 | 2012-03-21 | 华为终端有限公司 | Method, system and device for testing mobile terminal power-on and power-off |
| CN104535823A (en) * | 2015-01-19 | 2015-04-22 | 吴圣铎 | Pointer multimeter adapter for detecting high-frequency signals |
-
1994
- 1994-02-24 CN CN 94204431 patent/CN2196308Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101247614B (en) * | 2008-03-22 | 2012-03-21 | 华为终端有限公司 | Method, system and device for testing mobile terminal power-on and power-off |
| CN104535823A (en) * | 2015-01-19 | 2015-04-22 | 吴圣铎 | Pointer multimeter adapter for detecting high-frequency signals |
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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 |