How the detonometer works and how it is used

One type of intelligent single-stage detonation meter adopts high-performance microprocessor and panel type micro-printer. There are various applications in the machine, which can automatically complete data acquisition, process control and data processing. The measurement results can be digital display and print. The way is given. The machine has full functions, high precision, strong anti-interference ability, stable performance, low power consumption, small size, light weight, and AC and DC. Has a high performance price ratio.

The machine can directly measure the detonation speed of explosives, detonating cords and detonating tubes, the extension time of non-electric detonators, and the appropriate probes or sensors. It can also measure the speed of various small time or high-speed moving objects. After the measured data is processed by the microprocessor, the speed, time, etc. can be directly displayed, and can be printed by a panel type micro printer mounted on the machine.

The machine can store 50 data, and can take out the speed and time of each data; the average speed and average time of multiple data are viewed or printed. As long as the test data is not cleared, it can be permanently saved after power off. The machine has a standard frequency of 10MHZ, which has high stability and ensures the test accuracy of the instrument.

Second working principle

The instrument uses AT89S8252 microcontroller as the core control component, plus some high-speed CMOS circuits.

The basic function of the instrument is the measurement of the time interval and the detonation velocity is calculated from the input target distance. Multiple sets of data were used to calculate the average speed and average time. The instrument is equipped with a pair of target line input interfaces. When measuring, the pulse signal of the 1st target line is controlled by level 1, so that the counting gate is opened, the counter starts counting, and when the 2nd input port receives the pulse signal of the second pair of target lines When the control stage 2 closes the counting gate counter to stop counting, the measured time is stored in the instrument memory, and the microcomputer calculates the detonation speed by dividing the target distance input in advance by the measured time, and the measurement result is printed and displayed. The way is given. When the printout is used, the time value can retain 7 significant digits, and the time resolution is 0.1us. When the display output is used, the time value is divided into two files due to the limit of the display digits, and 6 valid digits are reserved. Switch 4 front and rear panel layout and structure

The front panel of the instrument adopts a convex light touch film panel, which is integrally attached to the bottom plate. The internal structure of the instrument adopts a large plate structure. Except for the transformer, all components are mounted on the bottom plate and the display plate, and the connectors of each unit are connected with a plug. The connection between the base and the flat cable is convenient for commissioning and maintenance.

Three operations

Keyboard description

The instrument keyboard adopts a light touch membrane button with a convex touch. There are 12 buttons: “0-9” is both a digital key and a function key. The “command” and “reset” keys are single function keys, which are explained one by one below.

5.1.1 Reset button

The main function is to clear the contents of the counter and the instrument restores the initial state before measurement. Invalid data is deleted in time in the automatic state. The instrument is automatically reset at power-on. After reset, it displays: “LN XX” is the number of data saved in the current system.

The instrument automatically saves the data and automatically clears it. If it is invalid data, you need to manually clear it by pressing the “Reset” button before saving the data automatically. Invalid data is not cleared and the instrument will not be able to calculate the average data.

5.1.2 Command Keys

Used in conjunction with other function keys, in addition to the reset button, the instrument must first press this button to perform other functions.

5.1.3 Production date key (number 0 key)

Enter the date of manufacture of the equipment under test.

Press the "command" button first, then press the "production day" button, then you can enter a number, (the button has become the number 0 button). The input date format is generally: **********. Such as.

5.1.4 Detection date key: (number 1 key)

Enter the date the equipment under test is verified.

Press the “Command” button first, then press the “Detect Date” button, then you can enter the number, (the button has become the number 1 button). The input date format is generally: **********. Such as.

5.1.5 number key (number 2 key)

Enter the lot number, serial number or test sequence number of the equipment under test. (You can also not lose).

Press the "Command" button first, then press the "Number" button, then you can enter a number, (the button has become the number 2 button). You can enter up to 6 digits.

5.1.6 Target distance key (number 3 key)

View target distance:

Press the "command" button, the "target distance" button, then the target distance value is displayed in mm.

Input the target distance to the host when measuring the detonation speed, and input the 0 target distance when measuring the detonator delay time.

Input target distance:

Press the "Command" button first, then press the "Target Distance" button, then you can enter a number, (the button has become the number 3 button). The unit is mm. You can enter up to 6 digits. After inputting, press the “Command” button to save the target distance. The target distance is always present after power off, and if other target distances are required, re-enter.

5.1.7 Display button: (number 4 button)

View each data; number 4 function.

After the data is measured, the display shows the current data time. To view the time and speed of multiple data, first press the “command” button, and then press the “display” button multiple times to alternately display the speed and time of each data. At this time, the default of the system is to page up, that is, 01, 02, 03, ... data. When there is too much data, you need to view it downwards. While the display is in progress, press the “Flip” button (number 6). The data sequence displayed at this time is downward, that is, the data of..., 03, 02, 01.

5.1.8 Print button: (number 5 button)

Command the printer to perform printing; the number 5 function.

Print all data:

After measuring the required data, first press the “command” button, then press the “print” button (number 5 button), the time and speed of each data will be printed; the average time and average speed of all data. If the date and number are entered before the test, the date and number will be printed at the same time.

Print a single data:

After measuring the required data, press the “Command” button and press the “Display” button repeatedly to display the time data, then press the “Print” button to print out the time and speed of the currently displayed single data.

5.1.9 Page up key: (number 6 key)

The system defaults to page up. When you need to page down, press this button when displaying data.

5.1.10 Clear key: (number 7 key)

Clear the last data or clear all data except the target distance in the machine; the number 7 function.

Clear the last data: first press the "command" button, then press the "clear" button twice. At this time, the number of remaining stored data "SN XX" is displayed. Repeat the operation to clear the next data.

Clear all data: first press the "command" button, then press the "clear" button three times, then the data is cleared "NULL".

5.2 Determination of deferred tube detonator delay time

5.2.1 Wiring

Insert the plastic tube of the non-electric detonator into the photoelectric sensor hole, and connect the photoelectric signal transmission line of the instrument to the instrument.

The input of the rear plate is on the "I" terminal (note +, - polarity); the piezoelectric sensor is connected to the test can, and the piezoelectric sensor signal line is connected to the input "II".

5.2.2 Testing

Initial setting:

Clear the original data - press the "command" button, then press the "clear" (number 7) button three times.

Check if the target distance is zero - press the "Command" and "Target Distance" keys to view the target distance. If it is not zero, it can be "0" and then press the "command" button to save. Regardless of whether the power is off or not, the target distance is zero.

Enter the test date, production date, number, and so on. These data can be lost or not, and are determined by the user. Tested directly after reset. Use a firing gun to activate the plastic detonating tube. After the explosion, the detonator's extension time can be read from the display window. After the countdown completes the “0”, the data is automatically saved. If the data is invalid, during this time. (including countdown), you can press the "Reset" button to clear in time. If it is not cleared in time, press the “command” button, then press the “clear” (number 7) button twice to clear the last data. After the countdown completes the "0", the next test can be performed. The instrument can store 50 data.

Here, since the time of the detonating tube is microsecond, the photoelectric signal is pointed to a section of the detonator.

Ignored it.

See the "Display" button and the "Print" button for instructions on viewing data and printing.

5.3 Detonating cord and explosive detonation speed determination

000011.1.1 Wiring:

Probe 1 is connected to the input "I" terminal, probe 2 is connected to the input "II" terminal, and the electric detonator is connected to the other.

Initiating device.

000011.1.2 Test:

Initial setting:

Clear the original data in the machine - press the "command" button, then press the "clear" (number 7) button three times.

Check if the target distance is correct - press the "Command", "Target Distance" (number 3) button to view the target distance. If it is not correct, you can enter the correct target distance value in mm, and then press "Command" to save. The target distance entered regardless of the power failure or not remains until it is re-entered.

The test date, production date, number, etc. can be lost or not, and are determined by the user. When input is required, it can be entered during the first data or the last data test. The target distance must be input when measuring the detonation speed. If there is no input target distance, only the time is displayed, and the detonation speed needs to be calculated manually. The detonator is used to detonate the electric detonator. After the explosion, the explosion time can be read from the display window. After the countdown is completed, the data is automatically saved. If the data is invalid, during this time (including the countdown), press "Reset". The key is cleared in time. If it is not cleared in time, press the “command” button, then press the “clear” (number 7) button twice to clear the last data. After the countdown completes the "0", the next test can be performed.

For data and print data, please refer to the “Display” button and the “Print” button for instructions.

000011.1 Plastic detonating tube detonation velocity measurement

000011.1.1 Wiring:

Attach the attached 3 m twisted pair or RF cable to the host, pay attention to the + and - polarity. The tested detonator is inserted into the copper tube of the photoelectric support, and the test length is selected. There are five kinds of length holes of 10, 20, 30, 40, 50 cm. The distance between the detonating point of the detonating tube and the copper tube should be greater than 300mm, and the detonating gun (needle) should be away from the signal line. The photoelectric sensor is connected to the input "I" and the input "II" terminal according to the direction of the explosion.

000011.1.2 Test:

Initial setting:

Clear the original data in the machine - press the "command" button, then press the "clear" (number 7) button three times.

Check if the target distance is correct - press the "Command", "Target Distance" (number 3) button to view the target distance. If it is not correct, you can enter the correct target distance value in mm, and then press "Command" to save. The target distance entered regardless of the power failure or not remains until it is re-entered.

The test date, production date, number, etc. can be lost or not, and are determined by the user. When input is required, it can be entered during the first data or the last data test. The target distance must be input when measuring the detonation speed. If there is no input target distance, only the time is displayed, and the detonation speed needs to be calculated manually. Use a firing gun to activate the plastic detonating tube. After the explosion, the explosion time can be read from the display window. After the countdown is completed, the data is automatically saved. If the data is invalid, it can be pressed before the countdown is completed. The "Reset" button is cleared in time. If it is not cleared in time, press the “command” button, then press the “clear” (number 7) button twice to clear the last data. After the countdown completes the "0", the next test can be performed.

For data and print data, please refer to the “Display” button and the “Print” button for instructions.

000011 measurement

000011.1 Detecting the crystal frequency

Test Methods:

The digital frequency meter has a sampling time of 1 s and is connected to the “10 MHz” frequency output terminal of the instrument's rear panel. The data should meet the specified technical requirements.

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