CN220858162U - Portable test equipment suitable for built-in call system - Google Patents
Portable test equipment suitable for built-in call system Download PDFInfo
- Publication number
- CN220858162U CN220858162U CN202322488625.4U CN202322488625U CN220858162U CN 220858162 U CN220858162 U CN 220858162U CN 202322488625 U CN202322488625 U CN 202322488625U CN 220858162 U CN220858162 U CN 220858162U
- Authority
- CN
- China
- Prior art keywords
- capacitor
- resistor
- wire
- twenty
- thirty
- 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.)
- Active
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 43
- 239000003990 capacitor Substances 0.000 claims description 251
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 230000003750 conditioning effect Effects 0.000 claims 4
- 238000010586 diagram Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Devices For Supply Of Signal Current (AREA)
Abstract
The utility model provides a portable testing device suitable for an in-machine call system, which comprises: sinusoidal signal generating circuit and power amplifying circuit. The portable test equipment suitable for the built-in call system is suitable for the portable test equipment of the built-in call system, provides a portable test equipment scheme for the built-in call system, has a simple overall structure, low cost and high adaptability, can complete the simple test requirement of the built-in call system by using one or more portable test equipment in an outfield, has a simple overall circuit structure and low cost, has uniform internal structure, can be adapted by only carrying out simple configuration change on different series of built-in call systems, has small test equipment volume and light weight, can be powered by using mains supply, and greatly reduces the number of the carried equipment in the outfield.
Description
Technical Field
The utility model relates to the field of in-plane call systems, in particular to portable test equipment suitable for an in-plane call system.
Background
The in-plane call system is a voice signal terminal on an airplane, and most airplanes need to use the in-plane call system.
However, the existing aircraft intercom system has a complex structure, needs to prepare a large number of instrument devices, is inconvenient to test, and cannot test the aircraft intercom device when the aircraft intercom system is carried out in a severe environment.
Therefore, it is necessary to provide a portable testing device suitable for an in-phone call system to solve the above technical problems.
Disclosure of utility model
The utility model provides portable test equipment suitable for an in-machine call system, which solves the problems that the in-machine call system test needs to prepare a large number of instrument equipment, the test is inconvenient, the external field condition is harsh, and the in-machine call equipment test cannot be performed.
In order to solve the above technical problems, the present utility model provides a portable test device suitable for an in-phone call system, including:
The sinusoidal signal generating circuit comprises a singlechip, the singlechip is connected with a third capacitor through a wire, the singlechip is connected with a second resistor through a wire, the singlechip is connected with a third resistor through a wire, the singlechip is connected with a first resistor and a second capacitor through a wire, the third resistor is connected with a fourth resistor through a wire, the fourth resistor and the third resistor are connected with a fifth capacitor through a wire, the singlechip is connected with a fourth capacitor through a wire, the fourth capacitor is connected with a fifth resistor through a wire, the fifth resistor is connected with a sixth resistor through a wire, the sixth resistor is connected with a seventh resistor through a wire, the seventh resistor is connected with a eighth resistor through a wire, the eighth resistor is respectively connected with a ninth capacitor and a second triode through a wire, the ninth capacitor is connected with a ninth resistor through a wire, direct current is connected between the ninth resistor and the first resistor, the ninth resistor is connected with a tenth resistor through a wire, the fourth capacitor is connected with a fifth capacitor through a wire, the fifth resistor is connected with a capacitor through a seventh resistor, the fourth resistor is connected with a capacitor through a seventh resistor through a fifth resistor, the capacitor is connected with a capacitor through a fifth resistor, the fourth resistor is connected with a capacitor through a fifth resistor, the capacitor is connected with a capacitor through a fifth resistor through a capacitor is connected with a fifth resistor through a capacitor and a capacitor is connected with a fifth resistor through a fifth resistor and a capacitor is connected with a capacitor through a fifth capacitor and a diode, the diode is connected with a power supply through a wire, and a sound propagation device is connected between the eleventh resistor and the tenth capacitor.
Preferably, a ground line is connected between the fourth resistor and the sixth capacitor.
Preferably, the diode and the first capacitor are power supply filter circuits.
Preferably, the first resistor, the second capacitor, and the third capacitor are oscillation signal generation circuits.
Preferably, the third resistor, the fourth resistor and the fifth capacitor are sinusoidal signal adjusting circuits, the fifth resistor, the fourth capacitor and the sixth capacitor are frequency doubling triangular wave adjusting circuits, the sixth resistor and the seventh capacitor are triangular wave adjusting circuits, the seventh resistor, the eighth capacitor, the ninth capacitor, the eighth resistor and the second triode are square wave adjusting circuits, and the tenth resistor, the eleventh resistor, the tenth capacitor, the first triode and the sound propagation device are amplifying circuits.
Preferably, the power amplifying circuit includes a chip, the chip is connected with a twenty-third resistor through a wire, the twenty-third resistor is connected with a nineteenth resistor through a wire, the chip is connected with a twenty-first capacitor and a twenty-second capacitor through a wire, the chip is connected with a twenty-third capacitor through a wire, the chip is connected with a twenty-fifth capacitor and a twenty-sixth resistor through a wire, the chip is connected with a twenty-seventh capacitor through a wire, the chip is connected with a second capacitor through a wire, a twenty-fourth resistor is connected between the twenty-sixth resistor and the twenty-third capacitor through a wire, a twenty-fourth resistor is connected between the twenty-sixth resistor and the twenty-seventh resistor through a wire, a ground wire is connected between the twenty-first capacitor and the second capacitor through a wire, an input end is connected between the twenty-first capacitor and the second capacitor through a wire, the twenty-third resistor is connected with the twenty-third resistor through a wire, and the chip is connected with a nineteenth resistor through a wire.
Preferably, the chip is connected with a forty-second capacitor and a forty-third capacitor through wires respectively, a grounding wire is connected between the forty-second capacitor and the forty-third capacitor through wires, the chip is connected with a thirty-fourth capacitor through wires, the thirty-fourth capacitor is connected with a thirty-eighth capacitor through a fourth live wire, the chip is connected with a thirty-third capacitor through wires, the thirty-third capacitor is connected with a thirty-seventh capacitor through a third live wire, the thirty-seventh capacitor is connected with the thirty-eighth capacitor through wires, and a second output end is connected between the thirty-seventh capacitor and the thirty-eighth capacitor through wires.
Preferably, the chip is connected with a thirty-second capacitor through a wire, the thirty-second capacitor is connected with a thirty-first capacitor through a second live wire, the thirty-first capacitor is connected with a twenty-eighth capacitor through a first live wire, and a first output end is connected between the thirty-second capacitor and the twenty-eighth capacitor through a wire.
Preferably, the chip is connected with a forty-first capacitor and a forty-first capacitor respectively through wires, a ground wire is connected between the forty-first capacitor and the forty-first capacitor, and direct current is connected between the twenty-third resistor and the forty-first capacitor through wires.
Compared with the related art, the portable testing equipment suitable for the in-machine communication system has the following beneficial effects:
the utility model provides portable test equipment suitable for an in-machine call system, provides a portable test equipment scheme for the in-machine call system, has simple integral structure, low cost and high adaptability, can complete the simple test requirement of the in-machine call system by using one or more portable test equipment in an external field, has simple integral circuit structure, low cost and uniform internal structure, can adapt to different series of in-machine call systems by only carrying out simple configuration change, has small volume and light weight, can use commercial power for power supply, and greatly reduces the number of out-field carrying equipment.
Drawings
FIG. 1 is a schematic diagram of a portable testing device for an in-phone call system according to a preferred embodiment of the present utility model;
Fig. 2 is a schematic diagram of a power amplifier circuit.
Reference numerals in the drawings: c1, first capacitor, C2, second capacitor, C3, third capacitor, C4, fourth capacitor, C5, fifth capacitor, C6, sixth capacitor, C7, seventh capacitor, C8, eighth capacitor, C9, ninth capacitor, C10, tenth capacitor, C21, twenty-first capacitor, C22, twenty-second capacitor, C23, twenty-third capacitor, C24, twenty-fourth capacitor, C25, twenty-fifth capacitor, C27, twenty-seventh capacitor, C30, thirty-fourth capacitor, C31, thirty-first capacitor, C32, thirty-second capacitor, C33, thirty-third capacitor, C34, thirty-fourth capacitor, C37, thirty-seventh capacitor, C38, thirty-eighth capacitor, C41, forty-first capacitor, C42, fortieth capacitor, C43, forty-third capacitor, C44, forty-fourth capacitor, R1, first resistor, R2, second resistor, R3, third resistor, R4, fourth resistor, R5, fifth resistor, R6, sixth resistor, R7, seventh resistor, R8, eighth resistor, R9, ninth resistor, R10, tenth resistor, R11, eleventh resistor, R19, nineteenth resistor, R23, twenty-third resistor, R24, twenty-fourth resistor, R26, twenty-sixth resistor, OUT1, first output terminal, OUT2, second output terminal, VCC, direct current, L1, first fire wire, L2, second fire wire, L3, third fire wire, L4, fourth fire wire, Q1, first triode, Q2, second triode, D1, diode, W1, sound propagation device, IN, input terminal.
Detailed Description
The utility model will be further described with reference to the drawings and embodiments.
Referring to fig. 1 and fig. 2 in combination, fig. 1 is a schematic structural diagram of a preferred embodiment of a portable testing device suitable for an in-phone call system according to the present utility model; fig. 2 is a schematic diagram of a power amplifier circuit. A portable testing device adapted for use in an in-flight telephony system, comprising:
The sinusoidal signal generating circuit comprises a singlechip, the singlechip is connected with a third capacitor C3 through a wire, the singlechip is connected with a second resistor R2 through a wire, the singlechip is connected with a third resistor R3 through a wire, the singlechip is connected with a first resistor R1 and a second capacitor C2 through a wire, the third resistor is connected with a fourth resistor R4 through a wire, the fourth resistor R4 and the third resistor R3 are connected with a fifth capacitor C5 through a wire, the singlechip is connected with a fourth capacitor C4 through a wire, the fourth capacitor C4 is connected with a fifth resistor R5 through a wire, the fifth resistor R5 is connected with a sixth resistor R6 through a wire, the sixth resistor R6 is connected with a seventh resistor R7 through a wire, the seventh resistor R7 is connected with a eighth resistor R8 through a wire, the eighth resistor R8 is respectively connected with a ninth capacitor C9 and a second transistor Q2 through a wire, the fourth resistor R4 is connected with a fifth capacitor C5 through a wire, the fifth resistor C9 is connected with a capacitor C6 through a wire, the third resistor R6 is connected with a third resistor R10 through a wire, the third resistor R6 is connected with a third resistor R5 through a third resistor R6 through a wire, a third resistor R9 is connected with a third resistor R10 through a third resistor R6, and a third resistor R6 is connected with a third resistor R7 through a third resistor R10 through a wire, and a third resistor R7 is connected with a third resistor R7 through a third resistor R10 between the third resistor R9 and a third resistor C10 and a third capacitor C through a third capacitor C10 and a wire and a third capacitor C through a wire, a first capacitor C1 is connected between the second capacitor C2 and the first resistor R1 through a wire, the first capacitor C1 is connected with a diode D1 through a wire, the diode D1 and the first capacitor C1 are connected with a power supply through a wire, and a sound propagation device W1 is connected between the eleventh resistor R11 and the tenth capacitor C10.
And a ground line is connected between the fourth resistor R4 and the sixth capacitor C6.
The diode D1 and the first capacitor C1 are power supply filter circuits.
The first resistor R1, the second resistor R2, the second capacitor C2, and the third capacitor C3 are oscillation signal generation circuits.
The third resistor R3, the fourth resistor R4 and the fifth capacitor C5 are sinusoidal signal adjusting circuits, the fifth resistor R5, the fourth capacitor C4 and the sixth capacitor C6 are frequency doubling triangular wave adjusting circuits, the sixth resistor R6 and the seventh capacitor C7 are triangular wave adjusting circuits, the seventh resistor R7, the eighth capacitor C8, the ninth capacitor C9, the eighth resistor R8 and the second triode Q2 are square wave adjusting circuits, and the tenth resistor R10, the eleventh resistor R11, the tenth capacitor C10, the first triode Q1 and the sound propagation device W1 are amplifying circuits.
The power amplification circuit comprises a chip, wherein the chip is connected with a twenty-third resistor R23 through a wire, the twenty-third resistor R23 is connected with a nineteenth resistor R19 through a wire, the chip is connected with a twenty-first capacitor C21 and a twenty-second capacitor C22 through a wire, the chip is connected with a twenty-fifth capacitor C25 and a twenty-sixth resistor R26 through a wire, the chip is connected with a twenty-seventh capacitor C27 through a wire, the chip is connected with a second capacitor C2 through a wire, a twenty-fourth capacitor C24 is connected between the twenty-sixth resistor R26 and the twenty-third capacitor C23 through a wire, a twenty-fourth resistor R24 is connected between the twenty-sixth resistor R26 and the twenty-seventh capacitor C27 through a wire, a ground wire is connected between the twenty-second capacitor C22 and the twenty-fourth capacitor C24 through a wire, an input end IN is connected between the twenty-first capacitor C21 and the second capacitor C2 through a wire, and the twenty-third capacitor C23 is connected with the twenty-fourth resistor R23 through a wire.
The chip is connected with a forty-second capacitor C42 and a forty-third capacitor C43 through wires, a grounding wire is connected between the forty-second capacitor C42 and the forty-third capacitor C43 through wires, the chip is connected with a thirty-fourth capacitor C34 through wires, the thirty-fourth capacitor C34 is connected with a thirty-eighth capacitor C38 through a fourth live wire L4, the chip is connected with a thirty-third capacitor C33 through wires, the thirty-third capacitor C33 is connected with a thirty-seventh capacitor C37 through a third live wire L3, the thirty-seventh capacitor C37 is connected with the thirty-eighth capacitor C38 through wires, and a second output end OUT2 is connected between the thirty-seventh capacitor C37 and the thirty-eighth capacitor C38 through wires.
The chip is connected with a thirty-second capacitor C32 through a wire, the thirty-second capacitor C32 is connected with a thirty-first capacitor C31 through a second live wire L2, the thirty-first capacitor C31 is connected with a twenty-eighth capacitor C28 through a first live wire L1, and a first output end OUT1 is connected between the thirty-second capacitor C30 and the twenty-eighth capacitor C28 through a wire.
The chip is respectively connected with a forty-first capacitor C41 and a forty-first capacitor C40 through wires, a ground wire is connected between the forty-first capacitor C41 and the forty-first capacitor C40, and a direct current VCC is connected between the twenty-third resistor R23 and the forty-first capacitor C41 through wires.
The sine signal generating circuit can generate sine waves of more than 100mV, and provides a signal source of sine signals for portable test equipment.
A power amplifying circuit: the circuit is composed of 2 diodes D1,1 TPA3110 circuit, 5 resistors and 19 capacitors, wherein a power supply, a forty-first capacitor C41, a forty-second capacitor C42, a forty-third capacitor C43 and a forty-fourth capacitor C44 are power supply filter circuits, and a nineteenth resistor R19, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-sixth resistor R26, a twenty-first capacitor C21, a twenty-second capacitor C22, a twenty-third capacitor C23, a twenty-fourth capacitor C24, a twenty-fifth capacitor C25, a twenty-seventh capacitor C27, a second capacitor C2, a thirty-first capacitor C31, a thirty-second capacitor C32, a thirty-third capacitor C33, a thirty-fourth capacitor C34, a thirty-fourth capacitor C30, a thirty-seventh capacitor C37, a thirty-eighth capacitor C38, a first live wire L1, a second live wire L2, a third live wire L3 and a fourth live wire L4 and a diode D1 form a power amplifier circuit. The power amplifier circuit can provide power of 30W for each of left and right channels, can amplify 100mV sine wave to more than 8V, can cover most of the range of machine input signals, and can provide a high-power sine signal source for portable test equipment.
The basic indexes and functions of the in-machine talker of the same machine type can be tested, the basic indexes and functions of products of different machine types can be tested by slightly changing the basic indexes and functions, external auxiliary equipment is not needed, 220V power supply can be directly used for supplying power, and indexes which mainly need to be tested are extracted to be the output indexes of the in-machine earphone, the output indexes of the receiving earphone and the output indexes of the speech through the index analysis of the in-machine talker system. Three circuits are needed to be designed respectively: a first part: a sinusoidal signal generating circuit; a second part: a power amplifying circuit; third section: earphone and speech index test circuit; fourth part: and a power supply circuit.
Compared with the related art, the portable testing equipment suitable for the in-machine communication system has the following beneficial effects:
the utility model provides portable test equipment suitable for an in-machine call system, provides a portable test equipment scheme for the in-machine call system, has simple integral structure, low cost and high adaptability, can complete the simple test requirement of the in-machine call system by using one or more portable test equipment in an external field, has simple integral circuit structure, low cost and uniform internal structure, can adapt to different series of in-machine call systems by only carrying out simple configuration change, has small volume and light weight, can use commercial power for power supply, and greatly reduces the number of out-field carrying equipment.
The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.
Claims (9)
1. A portable testing device adapted for use in an in-flight telephony system, comprising:
The sinusoidal signal generating circuit comprises a singlechip, the singlechip is connected with a third capacitor through a wire, the singlechip is connected with a second resistor through a wire, the singlechip is connected with a third resistor through a wire, the singlechip is connected with a first resistor and a second capacitor through a wire, the third resistor is connected with a fourth resistor through a wire, the fourth resistor and the third resistor are connected with a fifth capacitor through a wire, the singlechip is connected with a fourth capacitor through a wire, the fourth capacitor is connected with a fifth resistor through a wire, the fifth resistor is connected with a sixth resistor through a wire, the sixth resistor is connected with a seventh resistor through a wire, the seventh resistor is connected with a eighth resistor through a wire, the eighth resistor is respectively connected with a ninth capacitor and a second triode through a wire, the ninth capacitor is connected with a ninth resistor through a wire, direct current is connected between the ninth resistor and the fourth resistor, the ninth resistor is connected with a tenth resistor through a wire, the tenth resistor is connected with a fifth capacitor through a wire, the fifth resistor is connected with a capacitor through a seventh resistor through a wire, the fourth resistor is connected with a capacitor through a fifth resistor through a capacitor is connected with a fifth resistor through a fifth resistor, the fourth resistor is connected with a capacitor through a fifth resistor, the third resistor is connected with a capacitor through a fifth resistor through a capacitor is connected with a fifth resistor through a fifth resistor, a capacitor is connected with a capacitor through a fifth resistor with a fifth resistor through a capacitor is connected with a fifth transistor, the diode is connected with a power supply through a wire, and a sound propagation device is connected between the eleventh resistor and the tenth capacitor.
2. The portable testing device of claim 1, wherein a ground line is connected between the fourth resistor and the sixth capacitor.
3. The portable testing device of claim 1, wherein the diode and the first capacitor are power filter circuits.
4. The portable testing device of claim 1, wherein the first resistor, the second capacitor, and the third capacitor are oscillating signal generating circuits.
5. The portable testing device of claim 1, wherein the third resistor, the fourth resistor, and the fifth capacitor are sinusoidal signal conditioning circuits, the fifth resistor, the fourth capacitor, and the sixth capacitor are frequency-doubled triangular wave conditioning circuits, the sixth resistor and the seventh capacitor are triangular wave conditioning circuits, the seventh resistor, the eighth capacitor, the ninth capacitor, the eighth resistor, and the second triode are square wave conditioning circuits, and the tenth resistor, the eleventh resistor, the tenth capacitor, the first triode, and the sound propagation device are amplifying circuits.
6. The portable test device according to claim 1, wherein the power amplification circuit includes a chip, the chip is connected with a twenty-third resistor through a wire, the twenty-third resistor is connected with a nineteenth resistor through a wire, the chip is connected with a twenty-first capacitor and a twenty-second capacitor through a wire, the chip is connected with a twenty-third capacitor through a wire, the chip is connected with a twenty-fifth capacitor and a twenty-sixth resistor through a wire, the chip is connected with a twenty-seventh capacitor through a wire, the chip is connected with a second capacitor through a wire, a twenty-fourth capacitor is connected between the twenty-sixth resistor and the twenty-third capacitor through a wire, a twenty-fourth resistor is connected between the twenty-sixth resistor and the twenty-seventh capacitor through a wire, a ground wire is connected between the twenty-second capacitor and the twenty-fourth resistor through a wire, an input terminal is connected between the twenty-first capacitor and the second capacitor through a wire, the twenty-third capacitor is connected with a twenty-third resistor through a wire, and the chip is connected with a nineteenth resistor through a wire.
7. The portable testing device of claim 6, wherein the chip is connected with a forty-second capacitor and a forty-third capacitor through wires, respectively, a ground wire is connected between the forty-second capacitor and the forty-third capacitor through wires, the chip is connected with a thirty-fourth capacitor through wires, the thirty-fourth capacitor is connected with a thirty-eighth capacitor through a fourth live wire, the chip is connected with a thirty-third capacitor through wires, the thirty-third capacitor is connected with a thirty-seventh capacitor through a third live wire, the thirty-seventh capacitor is connected with the thirty-eighth capacitor through wires, and a second output terminal is connected between the thirty-seventh capacitor and the thirty-eighth capacitor through wires.
8. The portable testing device of claim 7, wherein the chip is wired with a thirty-second capacitor, wherein the thirty-second capacitor is wired with a thirty-first capacitor, wherein the thirty-first capacitor is wired with a twenty-eighth capacitor, and wherein a first output is wired between the thirty-second capacitor and the twenty-eighth capacitor.
9. The portable testing device of claim 6, wherein the chip is connected to a forty-first capacitor and a forty-first capacitor via wires, a ground line is connected between the forty-first capacitor and the forty-first capacitor, and a direct current is connected between the twenty-third resistor and the forty-first capacitor via wires.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202322488625.4U CN220858162U (en) | 2023-09-13 | 2023-09-13 | Portable test equipment suitable for built-in call system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202322488625.4U CN220858162U (en) | 2023-09-13 | 2023-09-13 | Portable test equipment suitable for built-in call system |
Publications (1)
Publication Number | Publication Date |
---|---|
CN220858162U true CN220858162U (en) | 2024-04-26 |
Family
ID=90746872
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202322488625.4U Active CN220858162U (en) | 2023-09-13 | 2023-09-13 | Portable test equipment suitable for built-in call system |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN220858162U (en) |
-
2023
- 2023-09-13 CN CN202322488625.4U patent/CN220858162U/en active Active
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN220858162U (en) | Portable test equipment suitable for built-in call system | |
CN207882381U (en) | A kind of rural area low-voltage circuit electric leakage lookup device | |
CN207516531U (en) | A kind of electroscope calibration equipment | |
CN209296877U (en) | Automatic test equipment of circuit board | |
CN106027812B (en) | A kind of 110 type voice distributing frame line inspection devices | |
CN109495811A (en) | Speaker | |
CN207993480U (en) | A kind of DSP tuning systems | |
CN211697971U (en) | Multifunctional instrument | |
CN101093977A (en) | True logarithm amplifier | |
CN205015080U (en) | Intelligence vibration monitoring module | |
CN207995368U (en) | A kind of DSP tuning systems for vehicle audio | |
CN206431215U (en) | Test equipment and its testing signal generation circuit for microwave communication device | |
CN207281170U (en) | A kind of anti-interference impedance measurement system of substation | |
CN206638811U (en) | A kind of radio-frequency pulse sampling holder | |
CN207475831U (en) | A kind of directive property speaker and electronic equipment | |
CN202406292U (en) | Reliability testing system for piezoelectric ceramic loudspeaker | |
CN216595270U (en) | General portable first workpiece testing device | |
CN204142891U (en) | Electric discontinuity of cable fault locator | |
CN101938255B (en) | Low-power consumption true logarithmic amplifier | |
CN204832417U (en) | Ammeter is qualified for next round of competitions in wall dark line defect point and is looked for appearance | |
CN213750077U (en) | Constant current source current digital sampling device | |
CN211263652U (en) | Line load and fault detection system based on STM32 singlechip | |
CN205320041U (en) | 2G is to 4G broadband fixed gain amplifier module | |
CN205280921U (en) | On --spot check gauge of three -phase electric energy meter | |
CN203519811U (en) | Multiple-position electric energy quality analytical test calibrating device |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
GR01 | Patent grant | ||
GR01 | Patent grant |