A unit tester calibration system and calibration method

Abstract

This invention discloses a unit tester calibration system and method, including a safety mechanism, a multi-channel test lead adapter box, and a time calibrator. The time calibrator includes an input pulse width signal detection unit, a control unit, a time display unit, and a standard signal output unit. The terminals of the multi-channel test lead adapter box are connected to the input terminal of the power-on time parameter measurement unit of the unit tester and the input pulse width signal detection unit of the time calibrator, respectively. This solves the problems of high error rates caused by the asynchronous operation of the unit tester's working and safety switching buttons and the oscilloscope's "STOP" button, and low accuracy caused by different oscilloscope time references, when using oscilloscopes for measurement. It replaces the signal generator metrological standard equipment previously required for calibrating unit testers, reducing the number of traceable metrological standards needed for unit tester calibration.

Description

Technical Field

[0001] This invention belongs to the field of calibration technology for unit testers of solid rocket motors, specifically relating to a unit tester calibration system and calibration method. Background Technology

[0002] The main function of the unit tester is to control the state transition of the solid rocket engine safety ignition mechanism (hereinafter referred to as the safety mechanism) between the working state and the safety state, and to test the performance of the safety mechanism product. It also tests the electrical performance parameters of the safety mechanism, such as contact resistance, coil resistance, insulation resistance, conversion current, actuation source voltage, and energization time, according to the index requirements.

[0003] Because the calibration unit tester involves a wide variety of parameters, the required metrological standards are also numerous and bulky, including low-resistance boxes, insulation resistance boxes, digital multimeters, oscilloscopes, rheostats, and DC regulated power supplies. Furthermore, the frequent replacement of metrological standards and cumbersome wiring during calibration make on-site calibration impossible. For example, when measuring the "power-on time" parameter using an oscilloscope, the asynchronous operation of the "operation and safety switch" button on the unit tester and the "STOP" button on the oscilloscope leads to a high rate of misoperation, low work efficiency, and low measurement accuracy. Since the power-on time of the motor and solenoid pin in the safety mechanism is on the order of milliseconds, the "operation and safety switch" button on the unit tester and the waveform acquisition "STOP" button on the oscilloscope must be pressed synchronously to complete the power-on time measurement. However, in actual on-site calibration environments, it is difficult to ensure synchronous operation by metrologists. Therefore, misoperation during operation easily leads to inaccurate measurement results and low work efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a unit tester calibration system and calibration method to meet the calibration requirements of the unit tester's "power-on time" and "release protection action time" parameters.

[0005] The objective of this invention is achieved through the following technical means: a unit tester calibration system, including a safety mechanism and a multi-channel test lead adapter box, and also including a time calibrator, which includes an input pulse width signal detection unit, a control unit, a time display unit, and a standard signal output unit.

[0006] The terminals of the multi-channel test lead adapter box are connected to the input terminals of the power-on time parameter measurement unit of the unit tester and the input pulse width signal detection unit of the time calibrator, respectively.

[0007] The standard signal output unit of the time calibrator is connected to the release / holding action time parameter measurement unit of the unit tester.

[0008] The input pulse width signal detection unit is electrically connected to the control unit and is used to receive pulse signals input by the safety mechanism; the standard signal output unit is electrically connected to the control unit and the unit tester and is used to output square wave signals of a specific width to the unit tester.

[0009] The control unit is used to detect the actual power-on time T when the safety mechanism switches from the safety state to the working state and applies power to the motor. 电机实际 T, which energizes the electromagnetic pin when switching from the working state to the safety state. 电磁销实际 It also outputs a square wave signal of a specific width and powers other units;

[0010] The time display unit, electrically connected to the control unit, is used to display the detected actual power-on time.

[0011] The time calibrator also includes a status indicator unit, comprising an input light and an output light, electrically connected to the control unit, used to indicate that the input pulse width signal detection unit and the standard signal output unit are in working condition.

[0012] The time calibration instrument also includes a reset unit, which is electrically connected to the control unit, and is used to clear the data displayed by the time display unit so that the test can be performed again.

[0013] A calibration method for a unit tester calibration system involves calibrating the power-on time. During calibration, the input indicator light on the status indicator unit illuminates. When the safety mechanism transitions from a safety state to an operating state, the motor generates a rising-edge pulse signal from low to high, returning to a low level after the transition. When the safety mechanism transitions from an operating state to a safety state, the electromagnetic pin generates a rising-edge pulse signal from low to high, returning to a low level after the transition. The power-on time measurement unit of the unit tester measures the indicated power-on time T of the motor. 电机示值 and the electromagnetic pin indication energization time T 电磁销示值 The pulse signal generated by the state transition of the safety mechanism is received by the input pulse width signal detection unit, and after processing by the control unit, the actual energization time T of the motor of the safety mechanism is measured. 电机实际 And the actual energizing time T of the electromagnetic pin 电磁销实际 The specific time is displayed through the time display unit; the difference between the indicated power-on time and the actual power-on time can be used to obtain the motor power-on time error and the electromagnetic pin power-on time error.

[0014] When calibrating the release protection action time, the output light of the status indicator unit illuminates. The control unit sends a square wave signal of a specific width to the release protection action time parameter measurement unit of the unit tester via the standard signal output unit. The release protection action time error can be obtained by subtracting the release protection action time measured by the unit tester from the known square wave signal of a specific width.

[0015] During power-on time calibration, the actual power-on time is reset to zero by the reset unit, allowing the measurement of the actual power-on time T for multiple motors and solenoid pins. 电机实际 and T 电磁销实际 .

[0016] The beneficial effects of this invention are as follows:

[0017] 1. By inputting the pulse width signal detection unit, simply press the "Work to Safety" and "Safety to Work" buttons on the unit tester interface to trigger the safety mechanism to complete the action conversion. This allows for accurate and intuitive measurement of the actual energization time T of the safety mechanism's motor and solenoid pin. 实际 And by reading the power-on time T detected by the unit tester 示值 To calculate the error in measuring the energizing time: ΔT = T 示值 -T 实际 It eliminates the need for synchronized button operation on the oscilloscope, resolving issues such as high error rates caused by the asynchronous operation of the control unit tester's switching buttons for working and safety functions with the oscilloscope's "STOP" button, and low accuracy due to different oscilloscope time base adjustments.

[0018] 2. It integrates the function of outputting a square wave signal of a specific width from a standard source, namely the standard signal output unit, which replaces the signal generator metrological standard equipment required by the previous calibration unit tester, reducing the number of metrological standards required for the calibration unit tester. Attached Figure Description

[0019] Figure 1 A schematic diagram of the unit tester calibration system structure;

[0020] Figure 2 This is a schematic diagram of the circuit structure of the control unit and the standard signal output unit;

[0021] Figure 3 This is a schematic diagram of the circuit structure of the input pulse width signal detection unit;

[0022] Figure 4 A timing diagram showing the energizing time and switching sequence of the motor and electromagnetic pin in the safety mechanism.

[0023] Figure 5 A schematic diagram of the front panel functions and input / output wiring diagram of the time calibrator;

[0024] Figure 6 This is a schematic diagram of the time calibration instrument.

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0026]

Example 1

[0027] like Figure 1 and Figure 6 As shown, a unit tester calibration system includes a safety mechanism and a multi-channel test lead adapter box, as well as a time calibrator. The time calibrator includes an input pulse width signal detection unit, a control unit, a time display unit, and a standard signal output unit.

[0028] The terminals of the multi-channel test lead adapter box are connected to the input terminals of the power-on time parameter measurement unit of the unit tester and the input pulse width signal detection unit of the time calibrator, respectively.

[0029] The standard signal output unit of the time calibrator is connected to the release / holding action time parameter measurement unit of the unit tester.

[0030] The input pulse width signal detection unit is electrically connected to the control unit and is used to receive pulse signals input by the safety mechanism; the standard signal output unit is electrically connected to the control unit and the unit tester and is used to output square wave signals of a specific width to the unit tester.

[0031] The control unit is used to detect the actual power-on time T when the safety mechanism switches from the safety state to the working state and applies power to the motor. 电机实际 T, which energizes the electromagnetic pin when switching from the working state to the safety state. 电磁销实际 It also outputs a square wave signal of a specific width and powers other units;

[0032] The time display unit, electrically connected to the control unit, is used to display the detected actual power-on time.

[0033] like Figure 4 As shown, when the safety mechanism switches from the safety state to the working state, the motor generates a rising edge pulse signal from low level to high level until the switch ends and returns to the low level. When the safety mechanism switches from the working state to the safety state, the electromagnetic pin generates a rising edge pulse signal from low level to high level until the switch ends and returns to the low level.

[0034] The input pulse width signal detection unit is used to receive the pulse signal from the safety mechanism and, in conjunction with the control unit, measures the actual energizing time T of the electromagnetic pin when the safety mechanism transitions from "operating state" to "safety state". 电磁销实际 When the safety mechanism switches from "safety mode" to "operating mode", the actual energizing time T of the motor is measured. 电机实际 ,

[0035] The control unit uses a C8051F02 microcontroller.

[0036] The standard signal output unit uses a high-stability temperature-controlled crystal oscillator (12MHz) as the time and frequency reference, and achieves the output of square wave signals of a specific width through the internal clock division technology of the C8051F02 microcontroller. It mainly outputs standard square wave signals of 20ms, 40ms, 60ms, 80ms, and 100ms, and connects to the "release protection action time" parameter measurement unit of the unit tester for calibration of the unit tester's "release protection action time" parameter.

[0037] The time display unit shows the measured actual power-on time T. 实际 It mainly uses a digital display to show the power-on time of the pulse width signal, and the displayed value can be dynamically refreshed.

[0038] The time calibrator also includes a status indicator unit, comprising an input light and an output light, electrically connected to the control unit, used to indicate that the input pulse width signal detection unit and the standard signal output unit are in working condition.

[0039] like Figure 5 As shown, this indicator light is mainly used to indicate whether the time calibrator is detecting input signals or outputting signals. When the "Input" key is pressed, the "Input" indicator light on the front panel of the calibrator will illuminate; when the "Output" key is pressed, the "Output" indicator light on the front panel of the calibrator will illuminate.

[0040] The time calibration instrument also includes a reset unit, which is electrically connected to the control unit, and is used to clear the data displayed by the time display unit so that the test can be performed again.

[0041] The standard signal output unit of the time calibrator is connected to the release and protection action time parameter measurement unit of the unit tester. The time calibrator acts as a signal source to send signals to the unit tester, which then performs the measurement to obtain the indicated value.

[0042] like Figure 3 As shown, the input pulse width signal detection unit uses a CD4096 inverter and a waveform rectifier circuit to detect the input pulse signal. The main function of the input pulse width detection circuit is to measure the actual energizing time of the motor and electromagnetic pin of the safety mechanism. The input pulse width signal is first filtered by a filter circuit consisting of capacitor C8 and resistor R4. Then, it is stabilized at approximately 4.7V by a 1N4732 Zener diode. Two IN4148 diodes are connected in reverse series at the positive terminal of the power supply to protect the load circuit. Finally, the input signal is shaped by two CD4096 inverters to produce a standard level output signal, thus fulfilling the requirement to measure the energizing time of the motor and electromagnetic pin of the safety mechanism.

[0043] like Figure 2As shown, the standard signal output unit includes a CD4096 inverter and an IN4148 diode connected in series. The inverter shapes the output signal of the control unit, and the diode protects the circuit load.

[0044] A calibration method for a unit tester calibration system involves calibrating the power-on time. During calibration, the input indicator light on the status indicator unit illuminates. When the safety mechanism transitions from a safety state to an operating state, the motor generates a rising-edge pulse signal from low to high, returning to a low level after the transition. When the safety mechanism transitions from an operating state to a safety state, the electromagnetic pin generates a rising-edge pulse signal from low to high, returning to a low level after the transition. The power-on time measurement unit of the unit tester measures the indicated power-on time T of the motor. 电机示值 and the electromagnetic pin indication energization time T 电磁销示值 The pulse signal generated by the state transition of the safety mechanism is received by the input pulse width signal detection unit, and after processing by the control unit, the actual energization time T of the motor of the safety mechanism is measured. 电机实际 And the actual energizing time T of the electromagnetic pin 电磁销实际 The specific time is displayed through the time display unit; the difference between the indicated power-on time and the actual power-on time can be used to obtain the motor power-on time error and the electromagnetic pin power-on time error.

[0045] When calibrating the release protection action time, the output light of the status indicator unit illuminates. The control unit sends a square wave signal of a specific width to the release protection action time parameter measurement unit of the unit tester via the standard signal output unit. The release protection action time error can be obtained by subtracting the release protection action time measured by the unit tester from the known square wave signal of a specific width.

[0046] During power-on time calibration, the actual power-on time is reset to zero by the reset unit, allowing the measurement of the actual power-on time T for multiple motors and solenoid pins. 电机实际 and T 电磁销实际 .

[0047] When the unit tester calibration system is working, such as Figure 5 As shown, (1) after the power is turned on, the time calibrator automatically enters the self-test program to determine whether the equipment is in good operating condition.

[0048] (2) Press the reset button on the calibrator to enter the system reset function. At this time, the calibrator will automatically jump into the power-on self-test program. The input indicator and output indicator on the front panel will light up at the same time and then remain off. The data displayed on the digital display will be "000.00", indicating that the system reset is over.

[0049] (3) Power-on time test: Before powering on, connect the input test cable of the time calibrator. After the time calibrator completes its power-on self-test, press the "Input" key in the working status indicator function area. The "Input" indicator light on the front panel of the calibrator will then illuminate, indicating that the calibrator is in input mode. At this time, the calibrator can receive external pulse signals and display the measurement results. The digital display will dynamically display the pulse width according to the input pulse signal. At this time, it does not respond to the function of outputting a square wave signal of a specific width. Pressing the clear key will clear the pulse width display without affecting the current status.

[0050] (4) When implementing the function of outputting a square wave signal of a specific width as a standard source, connect the output test cable of the calibrator before powering on. After the time calibrator completes its power-on self-test, press the "Output" key in the working status indicator function area. The "Output" indicator light on the front panel of the calibrator will then illuminate, indicating that the calibrator is in output mode. At this time, pressing the "20" ms, "40" ms, "60" ms, "80" ms, and "100" ms range keys will output the corresponding pulses normally, and the digital display will show the corresponding output pulse width. The input pulse function will not respond at this time. Pressing the clear key will clear the pulse width display without affecting the current status.

[0051] (5) The unit tester measures the energizing time parameter of the motor and the solenoid pin. 示值， Through △T=T 示值- T 实际 This is used to determine whether the data from the unit tester is accurate and valid. For the motor power-on time error, it is ΔT. 电机 =T 电机示值- T 电机实际 The time error for energizing the electromagnetic pin is ΔT. 电磁销 =T 电磁销示值- T 电磁销实际 .

[0052] Since the "motor energizing time" and "electromagnetic pin energizing time" of the safety mechanism are both in the millisecond range, the safety mechanism requires pressing the "Work to Fuse" and "Fuse to Work" buttons on the unit tester interface to trigger the action transition during the "working state" and "fuse to work" transition. Therefore, in actual measurement, it is necessary to ensure that the "Work to Fuse" and "Fuse to Work" buttons on the unit tester and the waveform acquisition "STOP" button on the oscilloscope are pressed synchronously to complete the energizing time measurement. However, in the actual field calibration environment, it is difficult to ensure that metrologists operate synchronously, making it difficult to achieve millisecond-level time measurements. Moreover, when using an oscilloscope to measure the energizing time of the "motor" and "electromagnetic pin" of the safety mechanism, there is a problem of human error in the readings due to different time references adjusted by different metrologists. Therefore, using an oscilloscope for measurement is prone to errors during operation, leading to inaccurate measurement results and low work efficiency. In this application, however, only pressing the "Work to Fuse" and "Fuse to Work" buttons on the unit tester interface is needed to trigger the safety mechanism to complete the action transition, which can accurately and intuitively measure the actual energizing time T of the safety mechanism's motor. 电机实际 And the actual energizing time T of the electromagnetic pin 电磁销实际 The error in the measured power-on time is calculated by reading the power-on time measured by the unit tester. This eliminates the need for synchronized button operation on the oscilloscope, resolving issues such as high error rates due to asynchrony between the unit tester's operating and safety switching buttons and the oscilloscope's "STOP" button, and low accuracy due to different oscilloscope time base adjustments.

[0053] Specifically, when the working-to-safe button is pressed, the electromagnetic pin generates a rising edge pulse signal from low to high level, which returns to low level after the transition is complete. The time calibrator detects T. 电磁销实际 When the safety switch to work button is pressed, the motor generates a rising edge pulse signal from low to high level, which returns to low level after the transition is complete. The time calibrator detects T. 电机实际 .

[0054] Furthermore, this application integrates a function to output a square wave signal of a specific width from a standard source for calibrating the "release protection action time" parameter of the unit tester. Since calibrating the "release protection action time" parameter requires an external signal source as a standard signal, the square wave signal output function of the time calibrator can output standard pulse signals of "20" ms, "40" ms, "60" ms, "80" ms, and "100" ms to calibrate the displayed value of the unit tester's "release protection action time," replacing the signal generator metrological standard equipment previously required for calibrating the unit tester and reducing the number of metrological standards needed for calibration. Therefore, this application not only improves the accuracy of the unit tester's metrological data, but the integrated and convenient features of the time calibrator's dedicated testing equipment also enhance the efficiency of metrological calibration work and meet the needs of on-site calibration.

Claims

1. A unit tester calibration system, comprising a safety mechanism and a multi-channel test lead adapter box, characterized in that: It also includes a time calibrator, which comprises an input pulse width signal detection unit, a control unit, a time display unit, and a standard signal output unit. The terminals of the multi-channel test lead adapter box are connected to the input terminals of the power-on time parameter measurement unit of the unit tester and the input pulse width signal detection unit of the time calibrator, respectively. The standard signal output unit of the time calibrator is connected to the release / holding action time parameter measurement unit of the unit tester. The input pulse width signal detection unit is electrically connected to the control unit and is used to receive the pulse signal input by the safety mechanism. The input pulse width signal detection unit includes a waveform rectifier circuit and an inverter. After the input pulse width signal is filtered by the waveform rectifier circuit, it is input to the inverter to shape the input signal into a standard level signal before output. The standard signal output unit is electrically connected to the control unit and the unit tester, and is used to output a square wave signal of a specific width to the unit tester; The control unit is used to detect the actual power-on time T when the safety mechanism switches from the safety state to the working state and applies power to the motor. 电机实际 T, which energizes the electromagnetic pin when switching from the working state to the safety state. 电磁销实际 It also outputs a square wave signal of a specific width and powers other units; The time display unit, electrically connected to the control unit, is used to display the detected actual power-on time; The time calibrator also includes a status indicator unit, comprising an input light and an output light, electrically connected to the control unit, used to indicate that the input pulse width signal detection unit and the standard signal output unit are in working condition.

2. The unit tester calibration system according to claim 1, characterized in that: The time calibration instrument also includes a reset unit, which is electrically connected to the control unit, and is used to clear the data displayed by the time display unit so that the test can be performed again.

3. The calibration method for a unit tester calibration system according to any one of claims 1-2, characterized in that: During power-on time calibration, the input indicator light of the status indicator unit illuminates. When the safety mechanism transitions from the safety state to the working state, the motor generates a rising edge pulse signal from low to high, returning to a low level after the transition. When the safety mechanism transitions from the working state to the safety state, the electromagnetic pin generates a rising edge pulse signal from low to high, returning to a low level after the transition. The power-on time measurement unit of the unit tester measures the motor's indicated power-on time T. 电机示值 and the electromagnetic pin indication energization time T 电磁销示值 ; Safety The pulse signal generated by the mechanism's state transition is received by the input pulse width signal detection unit, and after processing by the control unit, the actual energization time T of the safety mechanism's motor is measured. 电机实际 And the actual energizing time T of the electromagnetic pin 电磁销实际 The specific time is displayed through the time display unit; the difference between the indicated power-on time and the actual power-on time can be used to obtain the motor power-on time error and the electromagnetic pin power-on time error. When calibrating the release protection action time, the output light of the status indicator unit illuminates. The control unit sends a square wave signal of a specific width to the release protection action time parameter measurement unit of the unit tester via the standard signal output unit. The release protection action time error can be obtained by subtracting the release protection action time measured by the unit tester from the known square wave signal of a specific width.

4. The calibration method for a unit tester calibration system according to claim 3, characterized in that: During power-on time calibration, the actual power-on time is reset to zero by the reset unit, allowing the measurement of the actual power-on time T for multiple motors and solenoid pins. 电机实际 and T 电磁销实际 .

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