The switch vacuum tester uses the magnetron discharge method for measurement.The two contacts of the vacuum switch arc extinguishing chamber are separated by a certain distance, an electric field pulse high voltage is applied, and the arc extinguishing chamber is placed inside a solenoid coil or a new type of electromagnetic coil is placed outside the arc extinguishing chamber. A large current is passed through the coil, thereby generating a pulsed magnetic field synchronized with the high voltage inside the arc extinguishing chamber. In this way, under the action of the pulsed strong magnetic field and strong electric field, the charged ions in the arc extinguishing chamber move in a spiral manner and collide with residual gas molecules to cause ionization. The resulting ion current is approximately proportional to the residual gas density, i.e., the vacuum degree.
Technical Parameters
●Vacuum measurement range: 9.999×10-1～1×10-5
●Ion current measurement range: 9.999×10-1～1×10-7
●Measurement error: <10%
●Measurement resolution: 10-5pa
●Allowable ambient temperature: -20℃～50℃
●Air humidity: ≤80%RH
●Power supply: AC, 220V, 50Hz±10%
●Dimensions: 420×290×210 (mm)
●High voltage output: pulse 30kV 15kHz
(1) Used for quality control of arc extinguishing chambers in vacuum arc extinguishing chamber production lines, and for incoming inspection of arc extinguishing chambers by circuit breaker manufacturers.
(2) Used to detect the vacuum degree of vacuum arc extinguishing chambers installed on complete switchgear. This type of testing is mainly used for routine maintenance inspections by power supply departments and for determining the withstand capability of vacuum arc extinguishing chambers during capacity tests.
Wiring
Connect the magnetron current output terminal on the panel to the magnetron coil with a wire, so that the arc extinguishing chamber contacts are in the open state (the coil is sleeved outside the arc extinguishing chamber). Connect the high-voltage wire and signal input wire to the moving end and static end of the arc extinguishing chamber respectively. Note that the high-voltage wire should be suspended.
Tube Type Selection
When measuring, first select the tube type. The instrument has multiple tube types stored in it.
(1) Tube type selection operation method
Press the [Select key] to make [◢◢] point to the test tube type selection, press the [Confirm key], use the [+ key] or [- key] to adjust the tube type parameters. When the displayed tube type matches the code of the tube type to be measured, press the [Confirm key] to return to the main menu. If the tube type to be measured is not provided, a tube type with similar dimensions and the same wiring method can be used instead.
(2) Measurement
Press the [Select key] to move [◢◢] to the test vacuum tube "Pa", press the [Confirm key] and the instrument is in the measurement state. It automatically completes all measurement, calculation, display and other processes.
(3) Printing
If you need to print the test data, press the [Confirm key] to return to the main menu, press the [Select key] to move [◢◢] to print test data, then press the [Print key] to print all measurement data.
(4) If there is no substitute parameter available, you can press the [Select key] to move [◢◢] to "A", which directly gives the ionization current. Generally speaking, the ionization current...
