CN2394229Y - Universal test meter with two input channels - Google Patents
Universal test meter with two input channels Download PDFInfo
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- CN2394229Y CN2394229Y CN 99248711 CN99248711U CN2394229Y CN 2394229 Y CN2394229 Y CN 2394229Y CN 99248711 CN99248711 CN 99248711 CN 99248711 U CN99248711 U CN 99248711U CN 2394229 Y CN2394229 Y CN 2394229Y
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- input channel
- multiplex
- selected cell
- ammeter
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Abstract
The utility model relates to a universal test meter with two input channels. The utility model is mainly characterized in that a handle tool type electric meter is provided with two groups of detecting input channels used for respectively getting two groups of detection signals; the inner part of the electricity meter is also provided with processing units which can be used for reading the signals of the first and second detecting input channels, and then the functions of memory or straight forward calculation are chosen, making the power detecting operation more convenient.
Description
The utility model relates to a kind of dual input channel multi-functional ammeter, refers to a kind of multifunction electric meter that two groups of electric power sense channels is provided simultaneously and can stores computing respectively especially.
Electric power is that modern life institute can not or lack, because electric power and life are closely bound up, so the repair and maintenance of electric power i.e. nothing to be surprised at, and " multifunction electric meter " can be used to detect AC/DC electric current, magnitude of voltage, resistance value, capacitance and semiconductor element polarity etc., so for detecting the indispensable essential tool of electric power.Yet, the existing multi-functional single sense channel that all only possesses, particularly, therefore only possess a pair of probe lead, can only detection obtain one group of signal at every turn, when needs detect voltage and current signal more than two groups, after the technician must pull down original probe lead, change another tested end again, the beginning can be obtained and organize detection signal separately, in the use very inconvenience.But though there is at present the go forward side by side Multifunction ammeter of row operation of storing memory detected value to come out again, but still can only provide single passage measuring ability, though, can not solve the puzzlement of electrotechnics personnel on detecting fully on practicality so novel ammeter promotes much.
Therefore, the utility model fundamental purpose promptly possesses two groups and detects input channels and can detect two groups of signals row operation dual input channel multi-functional ammeter relatively of going forward side by side simultaneously providing a kind of.
The purpose of this utility model is achieved in that making aforementioned ammeter be provided with two groups detects input channel, supplies to connect two tested ends simultaneously, and obtains two groups of measured signal in regular turn, and ammeter inside is provided with processing unit again, and it includes: a microprocessor; The one function button group that is connected with microprocessor; The one A/D conversion processor that is connected with microprocessor; One channel selecting unit; One display that is connected and is driven by it with microprocessor; Corresponding first detects first multiplex's selected cell of input channel; Corresponding second detects second multiplex's selected cell of input channel; Wherein:
Aforementioned first, second multiplex's selected cell is to be connected with the A/D conversion processor through the channel selecting unit simultaneously;
When testing, the first/the second detection input channel is to be connected with tested end with the probe lead respectively, select test function and read order by first or second multiplex's selected cell subsequently, as when selecting the work earlier of first multiplex's selected cell, first multiplex's selected cell will be sent a signal and give microprocessor, after microprocessor is obtained message, make the A/D conversion processor read by first the control channel selected cell and detect the signal that input channel is sent into through first multiplex's selected cell, after conversion, detected value is presented on the display, this moment, the user can see through function button group selection execution memory function, to store this detected value;
Make first multiplex's selected cell restore subsequently, select measuring ability by second multiplex's selected cell, this message is delivered to microprocessor simultaneously, after microprocessor is obtained this message, be that the switching channel selected cell makes the A/D conversion processor read the signal of being sent into by the second detection input channel through second multiplex's selected cell, after conversion, detected value is presented on the display again, this moment the user can see through the function button group selection store this detected value or and last storage values convert, the value after it converts still can be stored.
The utility model relates to a kind of dual input channel multi-functional ammeter, mainly be to be provided with a display in the ammeter outside of a hand tool form, place, display below is provided with a function button group, this function button group below is set up first multiplex's selected cell and second multiplex's selected cell separately, and this first, second multiplex's selected cell includes a knob and an inner corresponding multistage contact thereof in the ammeter outside respectively;
The punishment of ammeter external bottom end is provided with a big current probe socket, two anodal probe socket receptacles and a minus earth end probe socket receptacle again, this two anodal probe socket receptacle cooperates the negative pole probe socket receptacle to constitute the first detection input channel and the second detection input channel respectively, and this first, second detection input channel is to be connected with first, second multiplex's selected cell respectively; Ammeter inside is provided with a processing unit again, and it is connected with aforementioned display, function button group, first and second multiplex's selected cell respectively.
Aforesaid dual input channel multi-functional ammeter, this processing unit includes at least: a microprocessor; One A/D conversion processor is to be connected with microprocessor, for its input signal is done simulation/numerical digit formal transformation person; One channel selecting unit is to be connected between aforementioned A/D conversion place device and first, second multiplex's selected cell, and controls its switching by microprocessor; Wherein: this microprocessor input end is that the contact that sees through a scrambler and aforementioned functional key groups, first, second multiplex's selected cell respectively is connected; The output terminal of microprocessor is to be connected with display again.
Aforesaid dual input channel multi-functional ammeter, this first multiplex (MUX) selected cell can see through the switching of knob, selects the first detection input channel to make measuring ability projects such as combined-voltage value, current value, resistance value, capacitance, frequency or semiconductor element polarity test.
Aforesaid dual input channel multi-functional ammeter, this second multiplex (MUX) selected cell then can see through the switching of knob, select the second detection input channel to do magnitude of voltage, current value detection.
Aforesaid dual input channel multi-functional ammeter, this function button group include zero key (ZERO), calculation keys (MATH), data key (DATA), alert ring key, record key (REC), ac/dc switch key (AC/DC) and the highest/minimum locking key (MAX MIN Pk) etc. at least.
Aforesaid dual input channel multi-functional ammeter, this channel selecting unit is made up of two groups of electronic switches, and it is connected between first, second multiplex's selected cell and A/D conversion processor.
Aforesaid dual input channel multi-functional ammeter, this first, second multiplex's selected cell further is provided with some protective devices, and each protective device is connected respectively between corresponding contact and earth terminal.
Aforesaid dual input channel multi-functional ammeter, this protective device is to be made of positive temperature coefficient resistor.
Aforesaid dual input channel multi-functional ammeter, this protective device is made up of two windings ground electric crystal.
Further specify architectural feature of the present utility model and purpose below in conjunction with accompanying drawing.
Brief Description Of Drawings:
Fig. 1 is the planar appearance figure of the utility model one preferred embodiment.
Fig. 2 is the calcspar of the utility model one preferred embodiment.
Fig. 3 is the microprocessor portion of a detailed circuit diagram of the utility model one preferred embodiment.
Fig. 4 is the another detailed circuit diagram of the utility model one preferred embodiment.
Fig. 5 is the planar appearance figure of the another preferred embodiment of the utility model.
Fig. 6 is the calcspar of the another preferred embodiment of the utility model.
At first, as shown in Figure 1, can find out outward appearance kenel of the present utility model, mainly be to be provided with a display 11 in ammeter 10 outsides of a hand tool form, do the demonstration of various detected values and set-up function, a function button group 12 is located to be provided with in ammeter 10 outsides below display 11 again, make various function selecting and set, as zero key (ZERO), calculation keys (MATH), data key (DATA), alert ring key, record key (REC), ac/dc switch key (AC/DC) and the highest/minimum locking key (MAX MIN Pk) etc.
The punishment of ammeter 10 external bottom end is provided with big current probe socket 15, two anodal probe socket receptacles 16,17 and a minus earth end probe socket receptacle 18 again, in the present embodiment, two anodal probe socket receptacles the 16, the 17th, shared negative pole probe socket receptacle 18 also is commonly and holds, and identical reference voltage is arranged; Two anodal probe socket receptacles 16,17 cooperate negative pole probe socket receptacle 18 to constitute the first detection input channel CH1 and the second detection input channel CH2 respectively again.
This first detection input channel CH1 and second detects input channel CH2 and can be connected with different tested objects with two groups of probe leads simultaneously, utilize the priority work of aforementioned first multiplex's selected cell 13 and second multiplex's selected cell 14 again, can with two groups of detected values under the prerequisite that does not change the probe lead, deliver to ammeter 10 demonstrations simultaneously or give the storage computing.
How to read first, second respectively as for ammeter 10 inside and detect the detected value that input channel CH1, CH2 send into, and give demonstration, storage exclusive disjunction etc., performed by the interior processing unit of establishing, the structure of relevant this processing unit sees also shown in Figure 2:
One microprocessor 20;
One A/D conversion processor 21 is to be connected with microprocessor 20, for its input signal is done simulation/numerical digit formal transformation person;
One channel selecting unit 22 is to be connected between aforementioned A/D conversion processor 21 and first, second multiplex's selected cell 13,14, and by microprocessor 20 its switchings of control; Wherein:
These microprocessor 20 input ends are that the contact that sees through scrambler 201～203 and aforementioned functional key groups 12, first, second multiplex's selected cell 13,14 respectively is connected;
The output terminal of microprocessor 20 then is connected with aforementioned display 11 again, and in the present embodiment, this display 11 is to be made of a LCD.
This first multiplex (MUX) selected cell 13 can see through the switching of knob 130, selects the first detection input channel CH1 to make measuring ability projects such as combined-voltage value, current value, resistance value, capacitance, frequency or semiconductor element polarity test.
14 switchings that can see through knob 140 of this second multiplex (MUX) selected cell select the second detection input channel CH2 to do magnitude of voltage, current value detection.
When actual the test, first, second detects input channel CH1, CH2 is connected with tested object with the probe lead respectively, see through first subsequently, second multiplex's selected cell 13,14 select first or second to detect input channel CH1, the measuring ability project of CH2 and read the order, when reading the signal of the first detection input channel CH1 earlier as selection, the knob 130 that promptly rotates first multiplex's selected cell 13 is to the section that will carry out test item, for example detect dc voltage value V, first multiplex's selected cell 13 will be sent a signal to microprocessor 20 this moment, differentiate user's selection function and passage order for microprocessor 20, microprocessor 20 will start channel selecting unit 22 and make first multiplex's selected cell 13 and 21 formation paths of A/D conversion processor subsequently, and after making the measured signal that enters by the first detection input channel CH1 send into A/D conversion processor 21 and be converted to the numerical digit signal, deliver to microprocessor 20 again, the user can see through the 12 selection demonstrations of function button group or store this detected value this moment.
After finishing demonstration or storing the detection signal of the first detection input channel CH1, the knob 130 that is about to first multiplex's selected cell 13 goes back to the OFF position, on second selected cell 14, heavily cover abovementioned steps subsequently, promptly can read the detection signal of the second detection input channel CH2.Finish the reading operation of two groups of detection signals when ammeter 10 after, except that giving store recording, also can see through the function selecting of function button group 12, carry out computing two groups of detection signals, the difference of the two for example, and operation values still can be stored.
Can find out the basic framework and the principle of work of set processing units in this ammeter 10 by above-mentioned explanation, as for its detailed circuit structure, detailed as described below:
At first see also shown in Figure 3, it is the detailed circuit structure of microprocessor 20 and peripheral many group codings device 201～203, in the present embodiment, this microprocessor 20 is to be made of the integrated circuit of numbering 16C924, and its output connecting pin RD0/SEG00 ~ RG7/SEG28 is for connecting display 11 (this is not shown in the figures); Its pin RB0～RB7 is connected with A/D conversion processor 21 again, to receive its output signal and to exchange read write command; Its pin RA0～RA5 is connected with scrambler 201～203 respectively again, is connected with first multiplex's selected cell 13, second multiplex's selected cell 14 and function button group 12 respectively so that see through scrambler 201～203; Its pin RC2 is connected with channel selecting unit 22 in addition, to control its switching channel.
See also shown in Figure 4 again, it is the detailed circuit structure of A/D conversion processor 21, channel selecting unit 22 and first, second multiplex's selected cell 13,14, wherein: A/D conversion processor 21 is to be made of the integrated circuit of numbering FS97OX, this A/D conversion processor 21 is connected with an ac/dc electric pressure converter 210 (RMS/DC) again, mainly be that the AC signal that first, second detection input channel CH1, CH2 send into is converted to d. c. voltage signal, be converted to the numerical digit signal by A/D conversion processor 21 again.
First, second multiplex's selected cell 13,14 is except that aforementioned knob 130,140 again, other has the multiple tracks road of many winding point A1 A1 '～A8 A8 ', B1 B1 '～B4 B4 ' formation corresponding to each test item, indicate test item performed when each junction closure is arranged in the drawings, please Jing is capable consult.
Moreover; first; second multiplex's selected cell 13; 14 further include many group protective devices 131～133; 141～143; and be connected corresponding each contact A1 A1 '～A8 A8 '; on B1 B1 '～B4 B4 '; prevent that processing unit is subjected to big voltage; big electric current invasion and attack; wherein protective device 131; 141 are made of posistor; protective device 132; 133; 142; 143 respectively by the electric crystal Q1～Q4 on two windings ground; Q6～Q9 constitutes; as first; second detects input channel CH1; CH2 sends into big electric current; during big voltage; the protective device 131～133 of aforementioned correspondence; 141～143 with rapid ground connection; and with big electric current; big voltage is isolated, and avoids its invasion and attack processing unit and causes damage.
22 of this channel selecting unit are that 4053 electronic switch U1A, U1B constitute by two group #, it is to be connected 21 of first, second multiplex's selected cell 13,14 and A/D conversion processors, and is controlled the change action of its contact by the pin CH-SEL of microprocessor 20.
Can find out by above-mentioned explanation, the detailed construction and the principle of work of the utility model one preferred embodiment, in addition, the utility model also can be another preferred embodiment, its exterior structure as shown in Figure 5, its external structure and last embodiment are roughly the same, in the present embodiment two groups of anodal probe socket receptacles 16 only do not exist together, 17 have independently negative pole probe socket receptacle 18 respectively, 19, meaning promptly, the first detection input channel CH1 and second detects input channel CH2 and is not total to ground wire, its reference voltage also is indivedual independent, and in response to being a change, the processing unit of ammeter 10 inside is also done relative adjustment, as shown in Figure 6, this first, second multiplex's selected cell 13,14 output terminals are to connect an A/D conversion processor 21 independently respectively, 21 ', two A/D conversion processors 21,21 ' again are connected with microprocessor 20 respectively, and by microprocessor 20 according to first, second multiplex's selected cell 13,14 signals of sending into, decision selects to read two A/D conversion processors 21, the order of 21 ' output signal.
The utility model has the advantages that: possess two groups and detect input channels, can detect simultaneously two groups of signals and carry out Computing relatively makes electric power detection operation more simple and easy.
Claims (9)
1. dual input channel multi-functional ammeter, it is characterized in that being provided with a display in the ammeter outside of a hand tool form, place, display below is provided with a function button group, this function button group below is set up first multiplex's selected cell and second multiplex's selected cell separately, and this first, second multiplex's selected cell includes a knob and an inner corresponding multistage contact thereof in the ammeter outside respectively;
The punishment of ammeter external bottom end is provided with a big current probe socket, two anodal probe socket receptacles and a minus earth end probe socket receptacle again, this two anodal probe socket receptacle cooperates the negative pole probe socket receptacle to constitute the first detection input channel and the second detection input channel respectively, and this first, second detection input channel is connected with first, second multiplex's selected cell respectively;
Ammeter inside is provided with a processing unit again, and it is connected with aforementioned display, function button group, first and second multiplex's selected cell respectively.
2. dual input channel multi-functional ammeter according to claim 1 is characterized in that this processing unit includes at least:
One microprocessor;
One A/D conversion processor is to be connected with microprocessor, for its input signal is done the formal transformation of simulation/numerical digit;
One channel selecting unit is to be connected between aforementioned A/D conversion place device and first, second multiplex's selected cell, and controls its switching by microprocessor; Wherein:
This microprocessor input end is that the contact that sees through a scrambler and aforementioned functional key groups, first, second multiplex's selected cell respectively is connected;
The output terminal of microprocessor is to be connected with display again.
3. dual input channel multi-functional ammeter according to claim 1 and 2, it is characterized in that first multiplex's selected cell can see through the switching of knob, select the first detection input channel to make measuring ability projects such as combined-voltage value, current value, resistance value, capacitance, frequency or semiconductor element polarity test.
4. dual input channel multi-functional ammeter according to claim 1 and 2 is characterized in that second multiplex's selected cell then can see through the switching of knob, selects the second detection input channel to do magnitude of voltage, current value detection.
5. dual input channel multi-functional ammeter according to claim 1 and 2 is characterized in that the function button group includes zero key ZERO, calculation keys MATH, data key DATA, alert ring key, record key REC, ac/dc switch key AC/DC and the highest/minimum locking key MAX MIN Pk etc. at least.
6. dual input channel multi-functional ammeter according to claim 2 is characterized in that this channel selecting unit is made up of two groups of electronic switches, and it is connected between first, second multiplex's selected cell and A/D conversion processor.
7. dual input channel multi-functional ammeter according to claim 2 is characterized in that first, second multiplex's selected cell further is provided with some protective devices, and each protective device is connected respectively between corresponding contact and earth terminal.
8. dual input channel multi-functional ammeter according to claim 7 is characterized in that protective device is to be made of positive temperature coefficient resistor.
9. dual input channel multi-functional ammeter according to claim 7 is characterized in that protective device is made up of two windings ground electric crystal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99248711 CN2394229Y (en) | 1999-10-18 | 1999-10-18 | Universal test meter with two input channels |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99248711 CN2394229Y (en) | 1999-10-18 | 1999-10-18 | Universal test meter with two input channels |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2394229Y true CN2394229Y (en) | 2000-08-30 |
Family
ID=34033836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99248711 Expired - Lifetime CN2394229Y (en) | 1999-10-18 | 1999-10-18 | Universal test meter with two input channels |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2394229Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108020699A (en) * | 2016-11-04 | 2018-05-11 | 翔熙实业股份有限公司 | Automobile circuit detection device |
-
1999
- 1999-10-18 CN CN 99248711 patent/CN2394229Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108020699A (en) * | 2016-11-04 | 2018-05-11 | 翔熙实业股份有限公司 | Automobile circuit detection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |