Oscilloscope Notes

For the safety of the instrument operator and the instrument, the instrument should work normally within the safe range to ensure the measurement waveform is accurate and the data is reliable. Please note:　　

1. For general oscilloscopes, adjust the brightness and focus knobs to minimize the spot diameter to make the waveform clear and reduce test errors; do not let the spot stay at one point, otherwise the electron beam will bombard one point and form a dark spot on the fluorescent screen, damaging the fluorescent screen. 2. Measurement system - such as oscilloscopes, signal sources; printers, computers and other equipment. The grounding wire of the electronic equipment under test - such as instruments, electronic components, circuit boards, power supply of the equipment under test, etc. must be connected to the public ground (earth).　

3. When the TDS200/TDS1000/TDS2000 series digital oscilloscope is used with a probe, it can only measure the waveform of the signal (the measured signal - the signal ground is the earth, and the signal end output amplitude is less than 300VCATII). It is absolutely not allowed to measure the floating ground signal of the AC220V mains or the electronic equipment that cannot be isolated from the AC220V mains.
4. The shell of the general oscilloscope, the metal outer ring of the BNC socket at the signal input end, the probe ground wire, and the AC220V power socket ground wire end are all connected. If the instrument is not connected to the earth wire when it is used, and the probe is used directly to measure the floating ground signal, the instrument will have a potential difference relative to the earth; the voltage value is equal to the potential difference between the point where the probe ground wire contacts the measured device and the earth. This will bring serious safety hazards to the instrument operator, the oscilloscope, and the electronic equipment under test.

5. If the user needs to measure the floating signal test of switching power supply (switching power supply primary, control circuit), UPS (uninterruptible power supply), electronic rectifier, energy-saving lamp, inverter and other types of products or other electronic equipment that cannot be isolated from AC220V mains, the DP100 high-voltage isolation differential probe must be used.