CN216351826U - Trigger for data acquisition instrument suitable for built-in IEPE conditioning - Google Patents
Trigger for data acquisition instrument suitable for built-in IEPE conditioning Download PDFInfo
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- CN216351826U CN216351826U CN202123301621.8U CN202123301621U CN216351826U CN 216351826 U CN216351826 U CN 216351826U CN 202123301621 U CN202123301621 U CN 202123301621U CN 216351826 U CN216351826 U CN 216351826U
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Abstract
The utility model provides a trigger for a data acquisition instrument suitable for built-in IEPE conditioning, which comprises a resistor and a trigger output end, wherein the resistor comprises a first resistor and a second resistor, the trigger output end, the first resistor and the second resistor are connected in series through a conducting wire, the second resistor is connected in parallel with a control switch, the control switch comprises a first binding post, a second binding post and a connecting conducting wire, two ends of the second resistor are respectively connected with the first binding post and the second binding post, the first binding post and the second binding post are connected through the connecting conducting wire, and the trigger output end is connected with the output end of the data acquisition instrument through a coaxial cable.
Description
Technical Field
The utility model relates to the field of test instrument equipment, in particular to a trigger for a data acquisition instrument, which is suitable for built-in IEPE conditioning.
Background
In ammunition explosion pressure measurement, not only pressure data needs to be collected, but also the explosion time needs to be accurately known so as to determine the arrival time of the pressure at the sensor, and a trigger needs to be used at the moment.
The trigger is a device capable of outputting high and low level or pulse signals according to sudden change of input signals, and generally a disconnection trigger is used, namely, the input end of the trigger is provided with two binding posts, two ends of a wire are connected to the two binding posts respectively, and when the power supply of the trigger is turned on, the wire is conducted; if the conducting wire is suddenly disconnected, the internal part of the trigger receives and processes the sudden change signal and outputs corresponding pulse or high and low level.
Most data acquisition instruments can only acquire voltage signals, so that the trigger with the structure is needed, and the disconnection time is determined by acquiring the signal change of the output end of the trigger. The flip-flop is generally complex in structure, a single chip microcomputer or an FPGA (Field Programmable Gate Array) is built in the flip-flop for signal conversion and forwarding, and a short delay exists in a trigger signal output by the flip-flop due to the need of reacting to a disconnection signal.
The piezoelectric pressure sensor with high frequency response is characterized in that a charge amplifying and processing circuit is integrated in the sensor to enhance the output signal-to-noise ratio of the sensor and facilitate the remote transmission of signals, and the sensor is called an IEPE sensor. When the sensor is used, a constant current source is needed to supply power, and therefore a constant current source conditioning circuit of the IEPE type sensor is built in a plurality of data acquisition instruments.
Aiming at the data acquisition instrument with the built-in IEPE conditioning function, a simpler and efficient method for determining the trigger time is invented by researching the structures of the sensor and the IEPE conditioning circuit, so that the trigger for the data acquisition instrument with the built-in IEPE conditioning function is invented.
Disclosure of Invention
In order to solve the technical problems, the utility model provides the trigger for the data acquisition instrument with the built-in IEPE conditioning function, which has the advantages of simple structure and good stability, and the trigger time can be determined through simple circuit connection.
In order to achieve the purpose, the utility model adopts the technical scheme that:
a trigger for a data acquisition instrument suitable for built-in IEPE conditioning is characterized in that: the resistance comprises a resistor and a trigger output end, the resistor comprises a first resistor and a second resistor, the trigger output end, the first resistor and the second resistor are connected in series through a wire, a control switch is connected in parallel on the second resistor and comprises a first binding post, a second binding post and a connecting wire, the two ends of the second resistor are respectively connected with the first binding post and the second binding post, the first binding post and the second binding post are connected and arranged through the connecting wire, the trigger output end is connected with the output end of a data acquisition instrument through a coaxial cable, the data acquisition instrument is arranged to define an acquisition channel connected with the trigger output end as an IEPE mode, the connecting wire is disconnected, the two ends of the first resistor and the second resistor generate step voltage fluctuation, and the step voltage fluctuation is displayed as a voltage output signal on the data acquisition instrument, the starting time of the voltage output signal is the disconnection time of the connecting lead, namely the triggering time.
In the above structure: the utility model has simple structure, preferably, the resistance values of the two first resistors and the two second resistors are both 1k omega by analyzing the structure of the IEPE type sensor and the IEPE conditioning circuit, the IEPE conditioning circuit outputs 4-6mA constant current to enable the constant current to flow through the two first resistors and the two second resistors, wherein one second resistor is short-circuited by the connecting lead, the first binding post and the second binding post, if the connecting lead is suddenly disconnected, step voltage fluctuation can be generated at the two ends of the two first resistors and the second resistor, and the starting moment of the step signal is the disconnection moment of the lead, namely the trigger moment.
Further: the voltage output signal v on the data acquisition instrument changes along with the increase of time t, the voltage output signal v0 is unchanged at the time t0-t1, the voltage output signal v0 gradually decreases at the time t1-t2, and the time t0 is the disconnection time of the connecting lead, namely the triggering time.
In the above structure: by observing the relationship between the voltage output signal v and the time t on the data acquisition instrument, analysis shows that the voltage output signal v0 is unchanged at the time t0-t1, the voltage output signal v0 is gradually reduced at the time t1-t2, and the time t0 is the disconnection time of the connecting lead, namely the triggering time.
Further: the output current of the circuit in the IEPE mode is constant current 4mA-6 mA.
Further: the resistance value of the first resistor is 1k omega, and the resistance value of the second resistor is 1k omega.
Compared with the prior art, the utility model has the beneficial effects that:
compared with the traditional trigger, the trigger circuit has the advantages that the trigger time can be determined through simple circuit connection, the structure is simple, and the stability is good; the flip-flop has a small delay because the digital circuit portion of the conventional flip-flop is eliminated.
Drawings
FIG. 1 is a schematic diagram of the circuit connection structure of the present invention;
FIG. 2 is a schematic diagram of the signal output curve of the data acquisition instrument of the present invention.
List of reference numerals:
1. a first wiring; 2. a second terminal; 3. a first resistor; 4. a second resistor; 5. a trigger output terminal; 6. and connecting the lead.
Detailed Description
The utility model is described in further detail below with reference to the following detailed description and accompanying drawings:
as shown in fig. 1-2, a trigger for a data acquisition instrument suitable for internal IEPE conditioning includes a resistor and a trigger output end 5, the resistor includes a first resistor 3 and a second resistor 4, the trigger output end 5, the first resistor 3 and the second resistor 4 are connected in series through a wire, the second resistor 4 is connected in parallel with a control switch, the control switch includes a first terminal 1, a second terminal 2 and a connecting wire 6, two ends of the second resistor 4 are respectively connected with the first terminal 1 and the second terminal 2, the first terminal 1 and the second terminal 2 are connected through the connecting wire 6, the trigger output end 5 is connected with an output end of the data acquisition instrument through a coaxial cable, the data acquisition instrument is configured to define an acquisition channel connected with the trigger output end 5 as an IEPE mode, and disconnect the connecting wire 6, step voltage fluctuation is generated at two ends of the first resistor 3 and the second resistor 4, the step voltage fluctuation is displayed as a voltage output signal on a data acquisition instrument, and the starting moment of the voltage output signal is the disconnection moment of the connecting wire 6, namely the triggering moment.
The utility model has simple structure, preferably, the resistance values of the two first resistors 3 and the second resistors are both 1k omega by analyzing the structure of the IEPE type sensor and the IEPE conditioning circuit, the IEPE conditioning circuit outputs 4-6mA constant current to enable the constant current to flow through the two first resistors 3 and the second resistors, wherein one second resistor 4 is short-circuited by the connecting lead 6, the first wiring terminal 1 and the second wiring terminal 2, if the connecting lead 6 is suddenly disconnected, step voltage fluctuation can be generated at the two ends of the two first resistors 3 and the second resistors, and the starting time of the step signal is the disconnection time of the lead, namely the trigger time.
In this embodiment: the voltage output signal v on the data acquisition instrument changes along with the increase of time t, the voltage output signal v0 is unchanged at the time t0-t1, the voltage output signal v0 gradually decreases at the time t1-t2, and the time t0 is the disconnection time of the connecting lead 6, namely the triggering time.
By observing the relationship between the voltage output signal v and the time t on the data acquisition instrument, analysis shows that the voltage output signal v0 is unchanged at the time t0-t1, the voltage output signal v0 is gradually reduced at the time t1-t2, and the time t0 is the disconnection time of the connecting wire 6, namely the triggering time.
In this embodiment: the output current of the circuit in the IEPE mode is constant current 4mA-6 mA.
In this embodiment: the resistance value of the first resistor 3 is 1k Ω, and the resistance value of the second resistor 4 is 1k Ω.
According to the utility model, two ends of a connecting wire 6 are respectively connected to the first binding post 1 and the second binding post 2, the output end 5 of the trigger is connected to the input end of a data acquisition instrument by a coaxial cable, the data acquisition instrument is arranged to define an acquisition channel connected with the output end 5 of the trigger as an IEPE mode, if the connecting wire 6 is disconnected and the second resistor 4 generates a short circuit, a voltage output signal shown in figure 2 can be seen on the data acquisition instrument, and at the moment, the position t0 is the disconnection moment of the connecting wire 6, namely the triggering moment.
Compared with the traditional trigger, the trigger circuit has the advantages that the trigger time can be determined through simple circuit connection, the structure is simple, and the stability is good; the flip-flop has a small delay because the digital circuit portion of the conventional flip-flop is eliminated.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, but any modifications or equivalent variations made according to the technical spirit of the present invention are within the scope of the present invention as claimed.
Claims (4)
1. A trigger for a data acquisition instrument suitable for built-in IEPE conditioning is characterized in that: the device comprises a resistor and a trigger output end (5), wherein the resistor comprises a first resistor (3) and a second resistor (4), the trigger output end (5), the first resistor (3) and the second resistor (4) are connected in series through a wire, a control switch is connected in parallel on the second resistor (4), the control switch comprises a first wiring terminal (1), a second wiring terminal (2) and a connecting wire (6), the two ends of the second resistor (4) are respectively connected with the first wiring terminal (1) and the second wiring terminal (2), the first wiring terminal (1) and the second wiring terminal (2) are connected and arranged through the connecting wire (6), the trigger output end (5) is connected with the output end of a data acquisition instrument through a coaxial cable, and an acquisition channel connected with the trigger output end (5) of the data acquisition instrument is defined as an IEPE mode, disconnecting the connecting wire (6), wherein step voltage fluctuation is generated at two ends of the first resistor (3) and the second resistor (4), the step voltage fluctuation is displayed as a voltage output signal on the data acquisition instrument, and the starting moment of the voltage output signal is the disconnection moment of the connecting wire (6), namely the triggering moment.
2. The trigger for data acquisition instrument suitable for built-in IEPE conditioning according to claim 1, wherein: the voltage output signal v on the data acquisition instrument changes along with the increase of time t, the voltage output signal v0 is unchanged at the time t0-t1, the voltage output signal v0 gradually decreases at the time t1-t2, and the time t0 is the disconnection time of the connecting lead (6), namely the triggering time.
3. The trigger for data acquisition instrument suitable for built-in IEPE conditioning according to claim 1, wherein: the output current of the circuit in the IEPE mode is constant current 4mA-6 mA.
4. The trigger for data acquisition instrument suitable for built-in IEPE conditioning according to claim 1, wherein: the resistance value of the first resistor (3) is 1k omega, and the resistance value of the second resistor (4) is 1k omega.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123301621.8U CN216351826U (en) | 2021-12-23 | 2021-12-23 | Trigger for data acquisition instrument suitable for built-in IEPE conditioning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123301621.8U CN216351826U (en) | 2021-12-23 | 2021-12-23 | Trigger for data acquisition instrument suitable for built-in IEPE conditioning |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216351826U true CN216351826U (en) | 2022-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123301621.8U Active CN216351826U (en) | 2021-12-23 | 2021-12-23 | Trigger for data acquisition instrument suitable for built-in IEPE conditioning |
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| CN (1) | CN216351826U (en) |
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2021
- 2021-12-23 CN CN202123301621.8U patent/CN216351826U/en active Active
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