CISPR 25:2016 CEV Limits

Conducted Emission – Voltage Method (Table 5)

This table compiles the Conducted Emission (CEV) voltage method limits (corresponding to Table 5) for automotive components per CISPR 25, including complete data for Class 1-5, suitable for EMC pre-compliance and certification reference.

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Levels in dB(µV). Scroll horizontally to view more.

Service / Band	Frequency MHz	Class 5			Class 4			Class 3			Class 2			Class 1
Service / Band	Frequency MHz	Peak	QP	Avg	Peak	QP	Avg	Peak	QP	Avg	Peak	QP	Avg	Peak	QP	Avg
BROADCAST
LW	0.15 to 0.30	70	57	50	80	67	60	90	77	70	100	87	80	110	97	90
MW	0.53 to 1.8	54	41	34	62	49	42	70	57	50	78	65	58	86	73	66
SW	5.9 to 6.2	53	40	33	59	46	39	65	52	45	71	58	51	77	64	57
FM	76 to 108	38	25	18	44	31	24	50	37	30	56	43	36	62	49	42
TV Band I	41 to 88	34	-	24	40	-	30	46	-	36	52	-	42	58	-	48
MOBILE SERVICES
CB	26 to 28	44	31	24	50	37	30	56	43	36	62	49	42	68	55	48
VHF	30 to 54	44	31	24	50	37	30	56	43	36	62	49	42	68	55	48
VHF	68 to 87	38	25	18	44	31	24	50	37	30	56	43	36	62	49	42

Understanding CISPR 25 Voltage Method (CEV)

The voltage method in CISPR 25 is used to measure conducted disturbances on power supply lines of automotive components. Unlike the current probe method which measures common-mode current, the voltage method typically uses an Artificial Network (AN) or LISN (Line Impedance Stabilization Network) to measure the noise voltage directly.

Key Differences from Current Probe Method:

Measurement Unit: Limits are defined in dB(µV) instead of dB(µA).
Setup: Requires direct connection to the LISN RF port.
Application: Primary method for ensuring that component noise does not interfere with the vehicle's electrical system via power lines.

Note for Engineers: CISPR 25 Class 5 is the most stringent level, typically required for components located near sensitive radio receivers.