Safety test - group pulse test (EFT)
Purpose
Verify the immunity of electronic equipment to transient disturbances caused by inductive load switching , relay contact bounce , or high-voltage switch switching
The energy of a single pulse is very small and will not affect the equipment, but if multiple pulses form a pulse group, the interference signal it generates will charge the junction capacitance of our equipment, when its energy accumulates to a certain level When it happens, it will cause the malfunction of our whole equipment.
burst generator
It’s probably as long as
the power of the EUT is turned on, and our EUT has a power input.
standard test
- GB17626.4-2008
- IEC61000-4-4-2004
The national standard test is divided into five levels: 500V, 1Kv, 2Kv, 4Kv, open level (specified by the customer), these levels are for the power port.
I/O ports (signal port and data port) also have grades: 250V, 500V, 1Kv, 2Kv, open grade
Parameter adjustment
The output mode of the coupled power supply: if it is a 2pin plug, select L1 and N , if it is a 3pin plug, select L1, N,
PE
Precautions
- The coaxial test should be turned on during the test
- Whether the main function of the test product is damaged during the test
- Touch the display screen of the device to see if there is any jumping phenomenon
- Observe whether there are splash screens, snowflakes, shutdowns, automatic restarts, etc.
During the ±2KV pulse group test:
1. The touch screen will not jump randomly, and the screen will not flicker. It is normal for the jump point to appear when the finger is on the same axis (X-axis or Y-axis)
;
3. The printing function is normal, and there are no abnormalities such as the printer cannot be connected or the printed content is disordered; 4. The Ethernet function is normal, and there are no abnormalities such as disconnection
during the PING process and failure to recover after disconnection;
Remarks: Individual tests need to be determined according to the actual finished product of the terminal under test