CN210037942U - Electric multimeter capable of preventing electric protection unwanted operation - Google Patents
Electric multimeter capable of preventing electric protection unwanted operation Download PDFInfo
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- CN210037942U CN210037942U CN201920812124.8U CN201920812124U CN210037942U CN 210037942 U CN210037942 U CN 210037942U CN 201920812124 U CN201920812124 U CN 201920812124U CN 210037942 U CN210037942 U CN 210037942U
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Abstract
The utility model discloses a prevent electric power universal meter of electric power protection maloperation, including pen-shape metre input and single chip processor, the pen-shape metre input is connected with the relay controller of control measurement gear, relay controller's output has voltage measurement circuit and resistance measurement circuit in parallel, voltage measurement circuit and resistance measurement circuit's output is connected with two inputs of single chip processor respectively, single chip processor's output and relay controller negative feedback are connected, single chip processor's output still is connected with LCD display and bee calling organ, this scheme can high-speed automatic range switch to resistance measurement, realize automatic detection, and output resistance in voltage measurement and resistance measurement process is high, can realize that the universal meter protects and protected equipment.
Description
Technical Field
The utility model belongs to the technical field of the universal meter, especially, relate to a prevent electric power protection maloperation's electric power universal meter.
Background
The multimeter is a magnetoelectric instrument with a rectifier and capable of measuring a plurality of electrical parameters such as alternating current, direct current, voltage, resistance and the like. For each electrical quantity, there are typically several ranges. The multimeter is composed of a magnetoelectric system ammeter (meter head), a measuring circuit and a selective switch. Through the transformation of the selector switch, various electrical parameters can be conveniently measured, the main basis of the circuit calculation is closed circuit ohm law, the universal meters are various, and the selection is carried out according to different requirements during use.
In a direct current system, a pair of balanced grounding resistors (R + and R-) are arranged on a positive bus and a negative bus, a certain distributed capacitor (C + and C-) is arranged on the bus to the ground, when a conventional multimeter is used for measuring the ground voltage of a branch circuit, the conventional multimeter does not have a range self-adaption function, when the low-resistance gear (the internal output resistance between two meter pens of the multimeter is very small) of the conventional multimeter is mistakenly used for measuring, the bus of the direct current system is grounded, and when the current discharged by the distributed capacitor of the bus to the ground meets the requirement of the action of a current coil, a tripping circuit is connected, so that accident tripping is caused.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a prevent electric power protection maloperation's electric power universal meter adopts the mode that increases the high output resistance in the voltage and the current measurement circuit in the universal meter to technical problem more than solving.
To achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a prevent electric power protection maloperation's electric power universal meter, includes pen-shape metre input and single chip processor, the pen-shape metre input is connected with the relay control ware of control measurement gear, the output of relay control ware connects in parallel has voltage measurement circuit and resistance measurement circuit, voltage measurement circuit and resistance measurement circuit's output is connected with two inputs of single chip processor respectively, single chip processor's output and relay control ware negative feedback are connected, single chip processor's output still is connected with LCD display and bee calling organ.
As an optimized scheme of the utility model, resistance measurement gear includes standard resistance R0 and the resistance Rx that awaits measuring of series connection between singlechip treater's reference voltage V + pin and ground wire COM pin, two liang of switch-ons of singlechip treater's reference voltage V + pin and Vref + pin, resistance Rx that awaits measuring installs between singlechip treater's IN + pin and IN-pin, standard resistance R0 installs between Vref + pin and IN + pin, two liang of switch-ons of IN-pin and ground wire COM pin.
As an optimized scheme of the utility model, voltage measurement circuit includes parallel connection's direct current voltage measurement circuit and alternating current voltage measurement circuit.
As an optimized scheme of the utility model, the default operating gear of relay controller is voltage measurement circuit.
As an optimized scheme of the utility model, voltage measurement circuit and resistance measurement circuit's measuring circuit all has high output resistance.
Compared with the prior art, the embodiment of the utility model provides a following beneficial effect has:
the embodiment of the utility model provides a pair of prevent electric power protection maloperation's electric power universal meter is acquiescence for voltage measurement at the in-process that uses initially to can high-speed automatic gear switch to resistance measurement, realize automatic detection, and the output resistance in voltage measurement and resistance measurement process is high, can realize universal meter self preservation and protected with equipment under test.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a block diagram of an overall technical principle structure in an embodiment of the present invention;
fig. 2 is a schematic diagram of a relay control according to an embodiment of the present invention;
fig. 3 is a diagram of a voltage measurement circuit according to an embodiment of the present invention:
fig. 4 is a diagram of a resistance measurement circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention are clearly and completely described with reference to the drawings in the embodiments of the present invention, and obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in FIG. 1 and FIG. 2, the utility model provides a prevent electric power protection maloperation's electric power universal meter, including pen-shape metre input and singlechip processor, the pen-shape metre input is connected with the relay control ware of control measurement gear, and the output of relay control ware is parallelly connected with voltage measurement circuit and resistance measurement circuit, and voltage measurement circuit and resistance measurement circuit's output is connected with two inputs of singlechip processor respectively, and singlechip processor's output and relay control ware negative feedback are connected, singlechip processor's output still is connected with LCD display and bee calling organ.
The relay controller mainly acts on the switching measuring circuit in the embodiment, the electric multimeter is guaranteed to have range self-adaption capability, when the relay controller is used, the on-off of the voltage measuring circuit and the resistance measuring circuit is controlled, the default working gear is the voltage measuring circuit, when the relay controller controls the voltage measuring circuit to be switched on, the multimeter firstly measures the voltages at two ends of a measured resistor, when the voltages exist, the switching circuit stops on the measuring voltage, the resistance measuring circuit cannot be switched on, and acousto-optic alarm is sent out.
When no voltage exists in the measurement, the singlechip processor regulates and controls the relay controller to switch on the resistance measurement circuit and switch off the voltage measurement circuit, and after the resistance measurement is finished, the universal meter is automatically switched to the voltage measurement.
By detecting whether the voltage on the tested resistance end is in the safety range of the detection circuit, the self-protection of the multimeter can be ensured.
As shown in figure 3, when the multimeter is opened for use, the relay controller is initialized to be switched to the voltage measuring circuit, the voltage to be measured is detected by using the direct-current voltage circuit and the alternating-current voltage circuit which are connected in parallel, and after the voltage to be measured is sampled through voltage division and is sampled, the voltage value to be measured is displayed through sampling analysis and calculation of the single-chip microcomputer processor, and because the output internal resistance of the multimeter is R + R1+ R2, wherein R and R1 are both high resistance, the high resistance output of the multimeter can be ensured.
If the multimeter is turned on for use and manually adjusted to switch to the resistance measuring circuit, error information is displayed and acousto-optic alarm is given.
As shown IN fig. 4, when the relay controller is switched to the resistance measurement circuit, the resistance measurement gear includes a standard resistor R0 and a resistor Rx to be measured, which are connected IN series between a reference voltage V + pin and a ground line COM pin of the single chip processor, the reference voltage V + pin and the Vref + pin of the single chip processor are connected IN pairs, the resistor Rx to be measured is installed between an IN + pin and an IN-pin of the single chip processor, the standard resistor R0 is installed between the Vref + pin and the IN + pin, and the IN-pin and the ground line COM pin are connected IN pairs.
The reference voltage V + of the single chip processor is used for supplying power to the R0 and the Rx, the Rx of the resistor to be measured can be calculated through partial pressure calculation, and the measured resistor is displayed through the LCD. Since the resistance is measured by the principle of the series resistor (R0), the R0 is ensured to be high-resistance in design, namely, the output of the multimeter is ensured to be in a high-resistance output state.
The electric multimeter of the embodiment is initially defaulted to voltage measurement in the use process, can be automatically switched to resistance measurement in a high-speed measuring range, realizes automatic detection, is high in output resistance value in the voltage measurement and resistance measurement processes, and can realize self protection of the multimeter and protection of a tested device.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (5)
1. The utility model provides an electric power universal meter for preventing electric power protection maloperation, a serial communication port, including pen-shape metre input and singlechip processor, the pen-shape metre input is connected with the relay control ware of control measurement gear, relay control ware's output is parallelly connected with voltage measurement circuit and resistance measurement circuit, voltage measurement circuit and resistance measurement circuit's output is connected with two inputs of singlechip processor respectively, singlechip processor's output and relay control ware negative feedback are connected, singlechip processor's output still is connected with LCD display and bee calling organ.
2. An electric multimeter for protection against power failures as recited in claim 1, wherein: the resistance measurement gear comprises a standard resistor R0 and a resistor Rx to be measured, wherein the standard resistor R0 and the resistor Rx to be measured are connected IN series between a reference voltage V + pin and a ground wire COM pin of the single chip microcomputer processor, the reference voltage V + pin and the Vref + pin of the single chip microcomputer processor are connected IN pairs, the resistor Rx to be measured is installed between an IN + pin and an IN-pin of the single chip microcomputer processor, the standard resistor R0 is installed between the Vref + pin and the IN + pin, and the IN-pin and the ground wire COM pin are connected IN pairs.
3. An electric multimeter for protection against power failures as recited in claim 1, wherein: the voltage measuring circuit comprises a direct current voltage measuring circuit and an alternating current voltage measuring circuit which are connected in parallel.
4. An electric multimeter for protection against power failures as recited in claim 1, wherein: and the default working gear of the relay controller is a voltage measuring circuit.
5. An electric multimeter for protection against power failures as recited in claim 1, wherein: the voltage measuring circuit and the resistance measuring circuit have high output resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920812124.8U CN210037942U (en) | 2019-05-31 | 2019-05-31 | Electric multimeter capable of preventing electric protection unwanted operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920812124.8U CN210037942U (en) | 2019-05-31 | 2019-05-31 | Electric multimeter capable of preventing electric protection unwanted operation |
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| Publication Number | Publication Date |
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| CN210037942U true CN210037942U (en) | 2020-02-07 |
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| CN201920812124.8U Active CN210037942U (en) | 2019-05-31 | 2019-05-31 | Electric multimeter capable of preventing electric protection unwanted operation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147391A (en) * | 2020-09-10 | 2020-12-29 | 国网江西省电力有限公司电力科学研究院 | Range self-adaptive power measuring device and method with high safety |
| CN112557722A (en) * | 2020-12-07 | 2021-03-26 | 中国南方电网有限责任公司超高压输电公司梧州局 | Universal oscillograph |
| CN114062744A (en) * | 2021-11-12 | 2022-02-18 | 沈阳铁路信号有限责任公司 | Protection circuit and method of resistance measurement circuit |
| CN117233515A (en) * | 2023-11-13 | 2023-12-15 | 广东电网有限责任公司佛山供电局 | Method and system for measuring state of outlet pressing plate |
-
2019
- 2019-05-31 CN CN201920812124.8U patent/CN210037942U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147391A (en) * | 2020-09-10 | 2020-12-29 | 国网江西省电力有限公司电力科学研究院 | Range self-adaptive power measuring device and method with high safety |
| CN112557722A (en) * | 2020-12-07 | 2021-03-26 | 中国南方电网有限责任公司超高压输电公司梧州局 | Universal oscillograph |
| CN114062744A (en) * | 2021-11-12 | 2022-02-18 | 沈阳铁路信号有限责任公司 | Protection circuit and method of resistance measurement circuit |
| CN114062744B (en) * | 2021-11-12 | 2023-02-10 | 沈阳铁路信号有限责任公司 | Protection circuit and method of resistance measurement circuit |
| CN117233515A (en) * | 2023-11-13 | 2023-12-15 | 广东电网有限责任公司佛山供电局 | Method and system for measuring state of outlet pressing plate |
| CN117233515B (en) * | 2023-11-13 | 2024-02-13 | 广东电网有限责任公司佛山供电局 | Method and system for measuring state of outlet pressing plate |
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