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STD Bridge Tweezers QPLCR
Profile：The bridge camera QPLCR adopts LMV358 high-performance operational amplifier, which is a simple and easy-to-use handheld bridge. Intelligent detection and measurement color screen display 9999, serial well measurement mode selection, measurement crystal quality factor, loss factor, 3 different frequencies 100/1k/10kHz.
License: Public Domain
Description
project from OSHWHub user moonyblue
Features
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Appearance diagram
2.Version distinction instructions
1.Convention name:
The first car = the first version = the 2S version
The second car = the second version = the 3S version
2.Corresponding version of 2S version PCB:
(all plate thickness 1.0)
Measuring board 2S Display board 2S Camera leg 2S
3.Corresponding version of 3S version PCB:
(all plate thickness 1.0)
Measuring board 3S Display board 3S Deterrent leg 2S
4.Corresponding firmware version:
| 2S: | 071 Vl.XXX | 571 Vl.XXX |
| 3S: | 071 V2.XXX |
3.Safety Instructions
- Do not use in flammable and explosive environments, avoid dusty, direct sunlight, and high radiation environments.
2.Non-professional maintenance personnel are welcome to open the back cover. When it is necessary to maintain, replace components and calibrate the instrument, non-professional maintenance personnel should perform it or contact relevant dealers and company after-sales service.
3.Do not disassemble or modify the instrument at will. Authorized modifications may cause permanent damage to the instrument.
4.For the measurement of on-line components, please measure that the power supply of the circuit has been cut off and all capacitances on the circuit have been discharged.
5.It is strictly forbidden to input voltage at the measurement port, and the charged components such as capacitors must be discharged before measurement.
6.The instrument is powered by a built-in buried battery, which can be used for charging with a mobile charger or a computer USB port. When charging, it can be turned on and can be used for measurement.
4.Environmental conditions
1.Altitude < 2000 meters
2.Storage humidity Transport ≤75% RH
3.Working environment 0℃~40℃
4.Storage environment -20℃ ~+50℃
Firmware Description
3S version:
v2.0.1:(LcrMeter071_v2.0.1.hex) 2022-1-28
1. Initial release.
v2.0.2:(LcrMeter071_v2.0.2.hex) 2022-2-9
1. Solve the problem of noise when booting up.
2. Occasionally jump to resistor when optimizing open circuit.
3. Add the function of long pressing the up button to rotate the screen.
v2.0.3:(QPLCR_3S071_v203.hex) 2022-2-16
1. Fix the bug that the 47K resistance cannot be measured.
2. Fix the problem that the inductance is displayed in the first few seconds when testing resistance.
3. Increase the display of version number. Long press the key, in the lower right corner.
4. The color of QPLCR changes with the color of the battery level.
v2.0.4:(QPLCR_3S071_v204.hex) 2022-2-22
1. Added self-calibration function.
v2.0.5:(QPLCR_3S071_v205.hex) 2022-3-1
1. Fix: 2M resistance error measurement problem
2. Optimization: The speed of displaying the battery power is accelerated after booting
3. Optimization: There is a small problem of "shutdown" afterimage when starting up
4. Added: USB host computer display function.
5. Added: restore factory settings function.
v2.0.6:(QPLCR_3S071_v206.hex) 2022-3-9 (The configuration options have changed a lot, and the factory settings will be automatically restored)
1. Modification: By default, the upper computer is not started, and when using it, press and hold the up and down keys to start it
2. Added: manual selection of measurement type
3. Added: on-off measurement function, the detection resistance value is modified by the host computer, and the measurement speed has not been optimized
4. Modification: the minimum unit of capacitance is changed to pF
(Note: This project is the work of Piao Zong, and it is shared on the Open Source Hardware Platform with the consent of Piao Zong. Thank you Piao Zong for his selfless dedication. For more details, please refer to the attachment!)
(Note 2: The schematic diagram of EDA is for reference only, and the PCB of EDA is imported, and has not been checked and verified. If you want to imitate, please download the Gerber production files and BOM in the attachment.)
Design Drawing
schematic diagram
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PCB
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PCB_display board_3S_2023-08-28
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PCB_measuring board_3S_2023-08-28
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PCB_tweezers legs2S_2023-08-28
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