b) Same-phase asynchronism: refers to the opening (closing) time difference among the same-phase breaks for switches with more than six breaks.
c) Bounce time: refers to the cumulative time value of all contacts and separations (i.e., bouncing) between the moving and static contacts of the switch during the closing process (i.e., the time from the first contact to full contact).
d) Opening time: for a circuit breaker in the closed position, the time interval from the moment the opening trip is energized to the moment when all pole arcing contacts separate.
e) Closing time: for a circuit breaker in the open position, the time interval from the moment the closing circuit is energized to the moment when all pole contacts touch.
f) Reclosing time: during the reclosing cycle, the time interval from the starting moment of the opening time to the moment when all pole contacts touch.
g) Just-opening (closing) speed: refers to the average speed of the moving contact relative to the static contact within a specified time or a specified distance at the moment of contact. Taking 10ms as an example, for opening, it is the average speed within 10ms after opening; for closing, it is the average speed within 10ms before closing.
h) Opening distance: refers to the distance from the beginning of the opening state to the moment when the moving contact just touches the static contact.
i) Maximum opening (closing) speed: refers to the maximum value among the instantaneous speeds during opening (closing). Generally, this value should appear at the point where the switch just opens or closes, which can be determined from the speed-stroke curve.
j) Average opening (closing) speed: refers to the ratio of the stroke to the time during the entire operation of the moving contact.
Daily Maintenance
This instrument is a precision and valuable device. Please store it properly when in use, and prevent it from heavy drops or impacts. When used outdoors, operate under shade as much as possible to avoid direct sunlight on the LCD screen for a long time.
When the instrument is not in use, it should be stored indoors with a temperature of -10 to 40°C, relative humidity not exceeding 80%, ventilation, and no corrosive gases. During humid seasons, if it is not used for a long time, it is best to power it on once a month for about 1 hour each time.
Safety Requirements
Please read the following safety precautions to avoid personal injury and prevent damage to this product or any other products connected to it. To avoid potential hazards, this product should only be used within the specified range.
1. Only qualified technicians should perform maintenance to prevent fire or personal injury.
2. Use appropriate power cords. Only use power cords that are dedicated to this product and comply with its specifications.
3. Connect and disconnect correctly. Do not arbitrarily connect or disconnect test leads when they are connected to live terminals.
4. Ground the product. In addition to grounding through the power cord's ground conductor, the grounding terminal on the product's enclosure must be grounded. To prevent electric shock, the grounding conductor must be connected to the ground. Before connecting to the product's input or output terminals, ensure that the product is properly grounded.
5. Pay attention to all terminal ratings. To prevent fire or electric shock hazards, pay attention to all ratings and markings on the product. Before connecting to the product, read the product manual to further understand the rating information.
6. Do not operate without the instrument cover. Do not operate this product if the cover or panel has been removed.
7. Use appropriate fuses. Only use fuses that comply with the specified type and rating of this product.
8. Avoid contact with exposed circuits and live metal. Do not touch exposed contacts and parts when the product is energized.
9. Do not operate if there is a suspected fault. If you suspect the product is damaged, contact maintenance personnel for inspection and do not continue operation.
10. After the test, wait for the discharge to complete before removing the test leads.
