The repetitive fast transient test is a test with bursts consisting of a number of fast transients, coupled into power supply, control and signal ports of electrical and electronic equipment. Significant for the test are the short rise time, the repetition rate and the low energy of the transients.

Test voltages of up to 4 kV in positive and negative polarities are applied to the A/C power leads and up to 2 kV is applied to the I/O cables. The test voltages are at a 5 kHz pulse repetition frequency and applied for 60 seconds to each power supply terminal including protective earth and every combination of these terminals. The coupling clamp is used to apply up to 2 kV to the I/O cables.

The preferential range of test levels for electrical fast transient test, applicable to power supply, protective earth (PE), signal and control ports of equipment is given below.

Open-circuit output test voltage (± 10%) and repetition rate of the impulses (± 20%)
Level	On power supply port, PE		On I/O (Input/Output) signal, data, and control ports
	Voltage Peak kV	Repetition Rate kHz	Voltage Peak kV	Repetition Rate kHz
1	0.5	5	0.25	5
2	1	5	0.5	5
3	2	5	1	5
4	4	2.5	2	5
X	Special	Special	Special	Special
"X" is an open level. The level has to be specified in the dedicated equipment specification.