I have seen many beginners using a DC high voltage generator for the first time, and the most common mistake they make is the wrong operating sequence - either close the high voltage switch without resetting the knob, or turn off the main power directly after the experiment and forget to turn off the high voltage first. These details may seem small, but they come at a great cost in high-voltage testing sites. Organize the complete process once.

1、 Wiring stage

First connect the grounding terminal of the control box to the grounding screw at the bottom of the high-voltage unit, and then connect it to the ground uniformly. The grounding wire must be connected in series to the bottom of the high-voltage unit, and multiple grounding wires are not allowed to be connected in series - series grounding is a major taboo. Once a section in the middle is disconnected, the entire grounding system will fail.

Then connect the control line (align the aviation plug with the positioning pin, press and tighten clockwise), and finally connect the high-voltage output line to the test sample. Attention: The red clip is connected to the conductor of the test sample, while the black clip is suspended or connected to the shielding layer. The black clip cannot be connected to the cable sheath - the sheath is grounded. Once the black clip is connected, it is equivalent to a direct short circuit and will inevitably cause overcurrent.

2、 Boosting stage

Close the main power switch, turn the voltage coarse adjustment knob counterclockwise to the zero position, and then close the high voltage switch. The green high voltage indicator light will turn on. Slowly turn the coarse adjustment knob clockwise to increase the voltage - note that the first 3/4 turns are the instrument's self checking stroke, and there is no voltage output. This is a normal design, not a fault. Continue to turn 3/4 turns before starting to increase the voltage.

For capacitive test samples (such as cables), the voltage must be gradually and uniformly increased, and the knob should not be turned too quickly, otherwise the surge current of capacitive charging will trigger overcurrent protection. Pause for about 2 seconds at 3/4 turn, wait for the capacitor charging current to stabilize before continuing to boost.

When precise voltage setting is required, first use the coarse adjustment knob to raise it to near the target value, and then use the fine adjustment knob to fine tune it. The fine adjustment range is about 3% to 8% of the current value.

3、 Shutdown phase

After the experiment is completed, first turn the knob counterclockwise back to zero, then turn off the high voltage switch, and finally turn off the main power supply. It is strictly prohibited to directly disconnect high voltage with the main power switch - the correct sequence is to disconnect high voltage first and then disconnect power, and the sequence must not be reversed.

After stopping the machine, discharge the capacitive test sample: use a discharge rod to approach the test sample from the far end, discharge the arc light first, and then contact the conductor to complete the full discharge after the arc light disappears. Finally, hang the grounding wire. The discharge rod can only be used in situations below 60kV, and specialized discharge tools are required for higher voltages.