Item Type: Digital Oscilloscope_x000D_ Input Impedance: 1M_x000D_ Analog Bandwidth: 0-200 KHz_x000D_ Maximum Input Voltage: 50Vpp with 1:1 probe, 400Vpp with 10:1 probe. _x000D_ Power Supply: DC 9V_x000D_ Maximum Real Time Sampling Rate: 1Msps_x000D_ Signal Source: Provide 1Hz/3.3V square wave test signal source. _x000D_ Accuracy: 12 Bit_x000D_ Sampling Buffer Depth: 1024 bytes. _x000D_ Vertical Sensitivity: 5mV/Div-20V/Div in 1-2-5 increments, vertical displacement can be adjusted according to the instructions. _x000D_ Coupling Mode: DC, AC, GND. _x000D_ Horizontal Time Base Range: 10S/Div-500s/Div in 1-2-5 increments. _x000D_ Features:_x000D_ 1. It has automatic, conventional and single shot modes, and is easy to catch instantaneous waveforms. _x000D_ 2. Available rising or falling edge triggers. _x000D_ 3. Adjustable trigger horizontal position, which can be adjusted according to the instructions. _x000D_ 4. Observable previous trigger waveform, negative delay. _x000D_ 5. Waveform display can be fixed at any time with HOLD function. _x000D_ _x000D_ _x000D_ How to Use: _x000D_ 1. Button function:_x000D_ V/DIV: Sensitivity and vertical position selection. _x000D_ SEC/DIV: Select time base and horizontal position. _x000D_ TRIGGER: Select trigger mode, trigger level or trigger edge. _x000D_ OK: Press once to enter the HOLD function, and press a second time to exit the HOLD function. _x000D_ ADJ: Direction key, turn left and right to select parameters, and the selected parameters will be highlighted. _x000D_ GND DC AC: The coupling can be switched to DC, AC or GND. When it is switched to GND, the oscilloscope input is disconnected from the external input and connected to the ground, that is, the input is 0V. _x000D_ 2. Function Operation: _x000D_ Vertical Position Alignment: Switch to GND, long press V/DIV for 3 seconds. _x000D_ Parameter Bar Opening or Closing: Press and hold the OK key for 3 seconds to open or close the parameter bar. _x000D_ Save Waveform: Press OK and TRIGGER at the same time, and the current waveform will be saved in EEPROM. The original data will be replaced. _x000D_ Read Waveform: Press OK and SEC/DIV at the same time to read the waveform and save it in EEPROM. Displayed in HOLD mode. _x000D_ Restore Default Settings: Press SEC/DIV and TRIGGER for 3 seconds. _x000D_ Center Horizontal Position: Press SEC/DIV for 3 seconds, and center horizontal position in the center of waveform buffer. _x000D_ Centering the Trigger Level: Long press TRIGGER for 3 seconds, and the trigger level will be centered in the center of the signal amplitude. _x000D_ 3 Probe Compensation Adjustment:_x000D_ Adjust the Trimming Capacitors C3 and C5:_x000D_ 1. Connect the red clip of the probe to the signal output terminal, and the black clip is not connected to the oscilloscope. _x000D_ 2. Power on and start, press and hold the ADJ knob for 3 seconds. The amplitude of the output test signal is displayed at the bottom of the screen, and then press ADJ to adjust the amplitude to 0.1V. _x000D_ 3. Set the sensitivity to 50mV, and adjust the trigger level to stabilize the waveform. _x000D_ 4. Adjust C3 to make the wave form a right angle. C3 adjustment completed. _x000D_ 5. Adjust the amplitude to 3.3V according to ADJ, set the sensitivity to 1V, and adjust C5 to make the wave form a right angle.