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1.Easy to use and quick to get started

2.The process supports design scales of 300 devices or 1000 pads

3.Supports simple circuit simulation

4.For students, teachers, creators


1.Brand new interactions and interfaces

2.Smooth support for design sizes of over 30,000 devices or 100,000 pads

3.More rigorous design constraints, more standardized processes

4.For enterprises, more professional users

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

Creation time: 2023-08-28 15:57:32
Update time: 2023-08-28 16:30:50
project from OSHWHub user moonyblue
  1. 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

  1. 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
1 /
1 /
ID Name Designator Footprint Quantity
1 MLT-7525 BUZZER1 BUZ-SMD_4P-L7.5-W7.5-P7.59-TL 1
2 0.1uF C101,C1,C2,C5,C6,C7,C8,C9,C10,C12,C13,C14,C15,C16 C0603 14
3 10uf/25V C102 C0603 1
4 10uF/25V C103 C0603 1
5 3.3nF C104 C0603 1
6 10uF C105 C0603 1
7 1N5819 D1,D2 SOD-323_L1.6-W1.3-LS2.7-RD 2
8 1.27MM*8P排针 J101,J102 HDR-TH_8P-P1.27-V-F 2
9 TS-1185EC-C-D-B K1,K2,K3 SW-SMD_4P-L3.7-W3.0-P1.50-LS4.7 3
10 1.14IPS-TFT LCD1 1.14IPS 1
11 MMBT3904_C727127 Q101,Q103 SOT-23-3_L2.9-W1.4-P1.91-LS2.6-BR 2
12 YJL3401A Q102 SOT-23-3_L2.9-W1.3-P1.90-LS2.4-BR 1
13 5.1kΩ R101,R102,R103,R104,R106,R107,R108,R13 R0603 8
14 10kΩ R105,R109,R12,R14,R17,R18,R19,R20 R0603 8
15 TP4057 U101 SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BR 1
16 XC6206-3.3V U102 SSOT-3_L2.9-W1.6-P0.95-LS2.8-BR 1
17 TYPE-C-31-M-12 USBC1 USB-TYPE-C_16PIN-2 1
18 10UF C3 C0603 1
19 TP J1,J2,J3,J4,J5,J6,J9,J10 TESTPOINT-TH_BD3.2 8
20 1.27MM*8P排母 J7,J8 HDR-TH_8P-P1.27-V-F 2
21 HEARDER2.54X6 JL1 2.54X1X6 1
22 1000Ω L1,L2 L0603 2
23 100Ω 0.1% R1,R2,R3 R0603 3
24 100Ω R4,R5,R9,R10 R0603 4
25 100kΩ R6,R7,R11,R15,R16 R0603 5
26 1KΩ R8 R0603 1
27 10KΩ 0.1% R21,R22,R23,R24 R0603 4
28 SN74LVC1G3157DCKR U3,U4 SC-70-6_L2.2-W1.3-P0.65-LS2.1-BR 2
29 AD8605ARTZ-R2 U5 SOT-23-5_L3.0-W1.7-P0.95-LS2.8-BL 1
30 STM32F071CBU6 U8 UFQFPN-48_L7.0-W7.0-P0.50-BL-EP5.6 1
31 PGA113AIDGST U9 VSSOP-10_L3.0-W3.0-P0.50-LS4.9-BL 1
32 GS8632C-SR U1,U2,U7,U6 SOP-8_L4.9-W3.9-P1.27-LS6.0-BL 4 1


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