WITRN K2 Voltage and Current Meter USB Tester PD3.1 Fast Charging Protocol Detec

1: K2 will only activate the PD function when the screen lights up by pressing the lightning button
2: When pressing the OK button to turn on the screen, PD is not supported, and entering PD spoofing or protocol detection will result in a black screen or repeated restarts
3: TYPE-C data plug K2 female socket can be flipped over and plugged in again if the screen does not light up after pressing the lightning button
4: The HID interface on the side of K2 is connected to a computer and cannot detect the protocol
5: K2 testing protocol will restart multiple times, which is a normal phenomenon. Do not connect the HID port for power supply during protocol testing







1. Introduction to K2
RTOS real-time operating system+WIUI human-computer interaction system
*32-bit high-speed CPU
*Independent 16 bit high-precision ADC sampling chip
*Independent electronic hard drive, capacity recording, power-off storage
*High speed sampling, fast refresh rate
*24P straight through high current and high conductivity copper USB-C terminal


1.1 K2 Characteristics
PD3.1 supports 28V EPR AVS deception
Multiple fast charging protocol detection and deception
Unified Four Dimensional WIOS+WIUI+PC
240MHz ultra high speed M4F 32-bit CPU with FPU hardware acceleration unit
Independent ADC sampling+on-chip 2MHz high-speed AD
The spectrum analysis function can simultaneously track the charging head ripple and its spectral characteristics
Built in capacity calculation function
Built in gravity sensor supports automatic screen rotation


Measurement voltage: DC 3.3~48V (K2-237)
Measurement voltage: DC 3.3~36V (K2-226)
Voltage resolution: 0.0001V
Capacity record: 0~99999Ah
Measurement current: 6A (10A short-term peak)
Current resolution: 0.0001A (bidirectional current detection)
Capacity record: 0~99999Wh
6A can work for a long time
10A is not recommended to exceed 2 minutes
CPU: ARM M4F 240MHz high-speed 32-bit with FPU hardware acceleration unit
Display: 1.54-inch color IPS LCD screen resolution: 240 * 240 (wide-angle screen)
Sensor: 3-axis gravity sensor
Core ADC: 16 bit independent ADC chip (INA226:36V, INA237:48V)
High speed sampling: 2Mhz high-speed on-chip ADC
Sampling resistor: low resistance sampling resistor (high side sampling) to prevent common ground interference
Main interface: 24P USB-C male/female socket direct connection
External sensor: Temperature measurement NTC-20 ~+120 (TYPE-C interface special temperature probe)
Storage medium: EEPROM wear balance
Firmware upgrade method: USB HID without driver (independent USB-C HID interface)
Computer online curve: HID upper computer (USB-C HID interface without driver)
VIP Code: Unique Serial Number
High speed waveform sampling: 2MHz Max
Ripple analysis: simultaneously lock and display frequency data and ripple value
Exterior dimensions: approximately 36.0 * 33.7 * 9.3 * mm (excluding USB-C male connector)