b) Same-phase asynchronism: refers to the time difference between the opening (closing) times of the same phase contacts for switches with more than six breaks.
c) Bounce time: refers to the cumulative time 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 complete 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 arc 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 start 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 distance at the moment of contact. For example, with 10ms, for opening it is the average speed within 10ms after opening, and for closing it is the average speed within 10ms before closing.
h) Opening distance: refers to the distance from the start 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 of the instantaneous speed 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 handle it with care, protect it from heavy drops and impacts. When used outdoors, operate it under shade as much as possible to avoid prolonged direct sunlight on the LCD screen.
When not in use, store the instrument in a well-ventilated, non-corrosive gas indoor environment with a temperature of -10 to 40°C and relative humidity not exceeding 80%. In 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.
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 the product if the cover or panel has been removed.
7. Use appropriate fuses. Only use fuses that comply with the type and rating specified for 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 testing, wait for discharge to complete before removing test leads.
