CN2116912U - Multi-functional test pencil with simulated indicator liquid crystal display - Google Patents
Multi-functional test pencil with simulated indicator liquid crystal display Download PDFInfo
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- CN2116912U CN2116912U CN 92208141 CN92208141U CN2116912U CN 2116912 U CN2116912 U CN 2116912U CN 92208141 CN92208141 CN 92208141 CN 92208141 U CN92208141 U CN 92208141U CN 2116912 U CN2116912 U CN 2116912U
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- liquid crystal
- voltage
- crystal display
- test pencil
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Abstract
The utility model relates to a multifunctional test pencil which uses the microelectronic technique. The voltage value and the phase sequence of the AC and the DC are measured and displayed quantitatively though an analog indicator LCD. A buzzer can decide the switching of the conducting wire without electricity, and the inducting pole of the LCD can decide the AC fire wire and check the yarn cutting. The tested voltage of phase sequence is converted through the A/D to drive the segment indicator on the LCD screen to display. The tested voltage valve can be known by the different locations of the indicator. The utility model is composed of a checkout contact, a hand-held pole, an LCD screen, an application-specific integrated circuit, a buzzing slice, an electronic device, etc. The utility model has the characteristics of simple circuit, little volume, convenient use, safety, low cost and easy implementation.
Description
The present invention relates to a kind of multi-functional survey electric tool, particularly can quantitatively show and measure AC/DC magnitude of voltage and phase sequence by liquid crystal display simulated pointer liquid crystal; And judge the on/off of live wire not by the hummer sound and judge the test pencil that exchanges live wire and look into broken string by the liquid crystal induction pole.
Existing test pencil is to be in series by test contact, current-limiting resistance, neon tube, metal spring and hand touched electrode.Test contact is contacted with measured object, the tentacle touched electrode that catches, whether the build-up of luminance measured object of deciding what is right and what is wrong is charged to observe neon tube.Such test lacks quantitative concept, uses and is limited to.
The patent No. 86203056 is that number shows electricity measurers, and it is to adopt the electric resistance partial pressure of biting, and drives the liquid crystal segmentation and shows, distinguishes 12,24,36,55,110, alternating voltage grade such as 220V.Yet segmentation has shown voltage range, and voltage digital offers the user but still can not have accurately, accurately quantitatively display voltage value, is subjected to the threshold characteristic limitations of liquid crystal, is difficult to accomplish 10 grades.
Purpose of the present invention: provide a kind of novel multifunctional test pencil, it is to use microelectric technique, quantitatively shows the measurement electrical quantity by the simulated pointer liquid crystal, as AC/DC magnitude of voltage and phase sequence; And judge that by the hummer sound on/off of live wire does not exchange live wire and looks into broken string with judging by the liquid crystal induction pole.Have rational in infrastructure, circuit is succinct, characteristics such as stable and reliable for performance and easy to use.
In order to realize this purpose, invention scheme of the present invention is: in Figure of description, Fig. 1 provides the structural representation of this test pencil.It is by test contact (1) (being yi word pattern driver bit φ 3), shell (2) (employing plastics), hold the utmost point (3) (for cap type), liquid crystal display (4), conductive rubber (5) (being 1 * 3 * 23), CMOS special IC Q2805(6), printed circuit board (PCB) (7), piezo (8) (being piezoelectric ceramic piece φ 11), little spring (9), electronic devices and components (10), power switch (11), AC/DC shift switch (12), additional jack (13), (14), external plug (15), (16), external probe (test pencil) (17), (18) and battery (41), (42) part constitutes.
As turning on the power switch (11), the people holds electrode (3), when surveying tested electrified body with test contact (1), measured body institute is with voltage to drive CMOS special IC Q2805(6 through dividing potential drop), this special IC of process Q2805(6) carries out the A/D conversion, drive liquid crystal display (4) and show tested magnitude of voltage, as the second hand in the simulated pointer liquid crystal wrist-watch.Same principle, when two phase lines were touched in two external probes (17), (18), its phase differential changed voltage into through phase shift and microelectric technique processing, shows phase sequence by liquid crystal display (4).
As when power switch (11) turn-offs, each is extremely all idiostatic by circuit and test contact (1) for other of liquid crystal display (4), has only liquid crystal display (4)
The utmost point is received and is held (3) and become zero potential, and impedance between the two is up to hundreds of megaohms, and the alternating current induction shows liquid crystal display (4)
Symbol comes, and so just can be used for induction and look into live wire, checks that the position of broken string takes place live wire.And for example when power switch (11) turn-offed, two external probes (17), (18) were by the hummer drive part in the electricity measurer, as long as the two poles of the earth short circuit, hummer just sends the toot-toot sound of reporting to the police, and is used to look into the on/off of lead.Fig. 2 provides the circuit working schematic diagram of this test pencil, and Fig. 3 provides CMOS special IC Q2805(6) the internal circuit configuration synoptic diagram, their architectural feature and being embodied in the Figure of description explanation is described respectively.
Below in conjunction with instructions is attached Fig. 2, Fig. 3 among the present invention are done further to implement to describe:
Fig. 2 provides the circuit working schematic diagram of this test pencil, wherein the tested voltage of test contact (1) is by divider resistance (55), (56), arrive bridge rectifier diode (19), (20), (21), (22) (adopting IN4148 or 2CK1), go up in resistance (23), (24) through overcommutation and produce sampled voltage.Another of bridge rectifier diode exchanges knee-joint and holds the utmost point (3).Bridge rectifier voltage send divider resistance (25), (26), (27) on the one hand, send CMOS special IC Q2805(6 on the other hand) (IN) end import.Device as a comparison, this Q2805(6) reference voltage input terminal (VR) is arranged, take from the central potential of battery (41), (42), also can produce by stabilivolt, to realize better accuracy, process CMOS special IC Q2805(6) after the processing, signal is connected liquid crystal display (4) by conductive rubber (5).At this moment liquid crystal display (4) is gone up the pointer that moves and can be indicated diverse location according to magnitude of voltage, and is retained in maximum position, till outage.
As when surveying direct current, AC/DC Gear-shift switch (12) is to the thruster of DC position, at this moment switch contact (43), (44), (45) closure, and switch contact (46), (47) disconnect.Resistance (56) and bridge rectifier diode (19), (20), (21), (22) are jumped over by short circuit.Resistance (26) is used for regulating zero point, and resistance (24) is used for regulating full scale.
As when measuring phase sequence, AC/DC Gear-shift switch (12) is to the AC thruster, and at this moment switch contact (43), (44), (45) disconnect switch contact (46), (47) closure.Because test contact (1) does not have voltage, external probe (17), (18) are delivered to signal on additional jack (13), (14).Behind the RC phase shift networking through (28), (29), (30) and (31), (32), (33), go up generation φ at resistance (58)
1And φ
2Signal.Process CMOS special IC Q2805(6) after the processing, output φ
0Signal arrives this Q2805(6 through resistance (34), diode (35)) (IN) end, electric capacity (36) strobes.So just realized that phase differential changes voltage into, reached the purpose of measuring phase sequence.
As when test cross flows, owing to additional jack (13), (14) do not have signal, φ
1And φ
22 equipotentials, φ
0The high level that output continues is isolated by diode (35), so be independent of each other.
As when surveying break-make, it is to push the OFF position to by power switch (11) that interior circuit battery (41), (42) disconnect, and switch contact (48), (49), (50), disconnects and realizing.Switch contact (51), (52) are connected simultaneously.Power supply (+3V) through additional jack (13), (14), arrive transistor (40) (adopting C9013 or 3DG201) the input utmost point by resistance (37), (38), resistance (39) is to be used for guaranteeing that transistor (40) effectively ends, and prevents mistake sound.In case external circuit is connected, can pass through transistor (40) and open CMOS special IC Q2805(6) inner oscillator (125), promptly send the warning sound.At battery (41), when (42) disconnect, hold on the utmost point (3) and the liquid crystal display (4)
The utmost point communicates through electric capacity (54), in order to survey ac induction voltage.When being provided with, considered tested person's safety at AC/DC Gear-shift switch (12), where rung, held between the utmost point (3) and any one rapier and do not have the resistance that is lower than 1 megaohm no matter switch (12) is dialled.
The start reset function is at battery (41), when (42) are connected, power switch (11) is pushed the ON position side to, and at this moment switch contact (48), (49), (50) are connected, and switch contact (51), (52) disconnect, electric capacity (57) is charging slowly, and counter (122) is resetted.
Fig. 3 provides the CMOS monograph and becomes circuit Q2805(6) the internal circuit configuration synoptic diagram.CMOS special IC Q2805(6) be by electric resistance array (59), (60)～(119), multi-way switch (120), voltage-phase comparer (115), counter (112), scrambler (123) is formed A/D converter, two separate oscillators (124), (125) and phase comparator compositions such as (126).Wherein the electric resistance array of 60 identical sizes (59)～(119) are to produce 1/60,2/60～60/60 of reference voltage (VR).When external signal (IN) is input to voltage-phase comparer (121) "+" end, when the impressed voltage value is higher than the input end " " of voltage-phase comparer (121), multi-way switch (120) clockwise rotates, increase counting, and when impressed voltage is lower than voltage-phase comparer (121) input end " ", multi-way switch (120) rotates counterclockwise, and reduces counting, can unidirectional or reversible counting.This test pencil adopts and progressively reduces to the unidirectional counting of VEE mode from (VR) level, and counter (122) keeps last count value, and the back output of encoded device (123) coding.Because adopt equidirectional to arrange when make 60 resistance in series arrays (59)～(119), relative error is smaller, the intrinsic standoff ratio error is less than 5%.Oscillator (124) produces liquid crystal display (4) and shows the necessary clock of sum counter (122).Oscillator (125) is to drive piezo (8), is chosen in the optimum frequency scope, realizes the purpose that little power consumption audio oscillation is reported to the police.Phase comparator (126) is a biconditional gate, works as φ
1With φ
2The same phase time of phase place, the output high level.Has only φ
1With φ
2Phase differential is enough big, make the output low level time be longer than height be at ordinary times between, output is just arranged.RC phase shift network (28), (29), (30) and (31), (32), (33) are effective equally for different voltages, realize that phase voltage is converted to voltage.Show phase place by liquid crystal display (4), can be variant for 50HZ and 60HZ different frequency, but can not adjust phase shifting component (28), (29), (30), (31), (32), (33) as qualitatively judging phase sequence.
Below provide this test pencil in concrete enforcement, the specification (illustrating in proper order) of relevant electronic devices and components (10) by code name among the figure:
(19), (20), (21), (22) are silicon diodes, adopt IN4148 or 2CK1.
(23), (25), (27), (37), (38), (39) are chip resistors 473.
(24), (26) are sheet trimmer potentiometers 103.
(28), (29) are chip capacitors 152.
(30), (58) are chip resistors 205.
(31), (32) are chip resistors 105.
(33) be chip capacitor 302.
(34) be chip resistor 104.
(36) be chip capacitor 104.
(40) be transistor, adopt C9013 or 3DG2013.
(41), (42) are button cell G8.
(53) be chip capacitor 101.
(54) be ceramic disc capacitor device 5PF1000V.
(55) be carbon resister 1/8W2M.
(56) be carbon resister 1/8W8M.
(57) be flaky electric capacity 103.
The present invention uses microelectric technique, quantitatively shows by the simulated pointer liquid crystal and measures AC/DC voltage and value phase sequence; And judge that by the hummer sound on/off of live wire does not exchange live wire and looks into broken string with judging by the liquid crystal display induction pole.Have rational in infrastructure, circuit is succinct, volume is little, be easy to carry, stable and reliable for performance, multi-functional, easy to use, safe, characteristics such as the cost cost is lower and easy to implement.
This Q2805(6) is scale special IC among the CMOS, provides the source of goods by Jiangsu Province's Changzhou Semiconductor Factory production at present.The structure of supporting with it liquid crystal display (4) is similar to simulated pointer liquid crystal wrist-watch, and electron tube group provides the source of goods by Shanghai.The ultrathin piezo of φ 11mm (8) provides the source of goods by producers such as Shanghai radio component one factories.
Claims (2)
1, a kind of multifunction test pencil with simulated pointer liquid crystal display, it is to use microelectric technique, quantitatively shows by the simulated pointer liquid crystal and measures AC/DC magnitude of voltage and phase sequence; And judge that by the hummer sound on/off of live wire does not exchange live wire and looks into broken string with judging by the liquid crystal induction pole, is characterized in that it is by test contact (1), insulation crust (2), hold the utmost point (3), liquid crystal display (4), conductive rubber (5), CMOS special IC Q2850 (6), piezo (8), little spring (9), electronic devices and components (10), power switch (11), AC/DC Gear-shift switch (12), additional jack (13), (14), external plug (15), (16), external probe (17), (18) and battery (41), (42) part constitutes.
2, test pencil according to claim 1, it is characterized in that CMOS special IC Q2805(6), independently oscillator (124), (125) and phase comparator (120) part are constituted for the A/D converter that its internal circuit structure constitutes by resistance in series array (59), (60)～(119), multi-way switch (120), voltage-phase comparer (121), counter (122), scrambler (123) and two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92208141 CN2116912U (en) | 1992-05-04 | 1992-05-04 | Multi-functional test pencil with simulated indicator liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92208141 CN2116912U (en) | 1992-05-04 | 1992-05-04 | Multi-functional test pencil with simulated indicator liquid crystal display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2116912U true CN2116912U (en) | 1992-09-23 |
Family
ID=4953706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92208141 Granted CN2116912U (en) | 1992-05-04 | 1992-05-04 | Multi-functional test pencil with simulated indicator liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2116912U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110632841A (en) * | 2019-09-12 | 2019-12-31 | 上海联捷消防科技有限公司 | Multifunctional intelligent tool watch |
-
1992
- 1992-05-04 CN CN 92208141 patent/CN2116912U/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110632841A (en) * | 2019-09-12 | 2019-12-31 | 上海联捷消防科技有限公司 | Multifunctional intelligent tool watch |
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| 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 |