CISPR 25:2016 / 2021 RE Limits

Name: CISPR 25:2016 & 2021 Radiated Emission (RE) Limits
Creator: EMCCalc
Keywords: CISPR 25 radiated emission limits, CISPR 25 RE, automotive EMC RE limits, ALSE method limits, CISPR 25 Class 5 RE, radiated disturbance limits

Radiated Emission – ALSE Method (Absorber Lined Shielded Enclosure)

This table integrates the Radiated Emission (RE) limit requirements (corresponding to Table 7) for automotive components per CISPR 25, including complete data for Class 1-5, suitable for EMC pre-compliance and certification reference.

Limit Visualization Curve

Envelope

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Levels in dB(µV/m). 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	46	33	26	56	43	36	66	53	46	76	63	56	86	73	66
MW	0.53 to 1.8	40	27	20	48	35	28	56	43	36	64	51	44	72	59	52
SW	5.9 to 6.2	40	27	20	46	33	26	52	39	32	58	45	38	64	51	44
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	28	-	18	34	-	24	40	-	30	46	-	36	52	-	42
TV Band III	174 to 230	32	-	22	38	-	28	44	-	34	50	-	40	56	-	46
DAB III	171 to 245	26	-	16	32	-	22	38	-	28	44	-	34	50	-	40
TV Band IV	468 to 944	41	-	31	47	-	37	53	-	43	59	-	49	65	-	55
DTTV	470 to 770	45	-	35	51	-	41	57	-	47	63	-	53	69	-	59
DAB L Band	1447 to 1494	28	-	18	34	-	24	40	-	30	46	-	36	52	-	42
SDARS	2320 to 2345	34	-	24	40	-	30	46	-	36	52	-	42	58	-	48
MOBILE SERVICES
CB	26 to 28	40	27	20	46	33	26	52	39	32	58	45	38	64	51	44
VHF	30 to 54	40	27	20	46	33	26	52	39	32	58	45	38	64	51	44
VHF	68 to 87	35	22	15	41	28	21	47	34	27	53	40	33	59	46	39
VHF	142 to 175	35	22	15	41	28	21	47	34	27	53	40	33	59	46	39
Analogue UHF	380 to 512	38	25	18	44	31	24	50	37	30	56	43	36	62	49	42
RKE	300 to 330	32	-	18	38	-	24	44	-	30	50	-	36	56	-	42
RKE	420 to 450	32	-	18	38	-	24	44	-	30	50	-	36	56	-	42
Analogue UHF	820 to 960	44	31	24	50	37	30	56	43	36	62	49	42	68	55	48
GSM 800	860 to 895	44	-	24	50	-	30	56	-	36	62	-	42	68	-	48
EGSM/GSM 900	925 to 960	44	-	24	50	-	30	56	-	36	62	-	42	68	-	48
GPS L1 civil	1567 to 1583	-	-	10	-	-	16	-	-	22	-	-	28	-	-	34
GLONASS L1	1591 to 1616	-	-	10	-	-	16	-	-	22	-	-	28	-	-	34
GSM 1800 (PCN)	1803 to 1882	44	-	24	50	-	30	56	-	36	62	-	42	68	-	48
GSM 1900	1850 to 1990	44	-	24	50	-	30	56	-	36	62	-	42	68	-	48
3G / IMT 2000	1900 to 1992	44	-	24	50	-	30	56	-	36	62	-	42	68	-	48
3G / IMT 2000	2010 to 2025	44	-	24	50	-	30	56	-	36	62	-	42	68	-	48
3G / IMT 2000	2180 to 2170	44	-	24	50	-	30	56	-	36	62	-	42	68	-	48
Bluetooth/802.11	2400 to 2500	44	-	24	50	-	30	56	-	36	62	-	42	68	-	48

Service / Band	Frequency MHz	RBW	Class 5			Class 4			Class 3			Class 2			Class 1
Service / Band	Frequency MHz	RBW	Peak	QP	Avg	Peak	QP	Avg	Peak	QP	Avg	Peak	QP	Avg	Peak	QP	Avg
BROADCAST
LW	0.15 to 0.3	9 kHz	46	33	26	56	43	36	66	53	46	76	63	56	86	73	66
MW	0.53 to 1.8	9 kHz	40	27	20	48	35	28	56	43	36	64	51	44	72	59	52
SW	5.9 to 6.2	9 kHz	40	27	20	46	33	26	52	39	32	58	45	38	64	51	44
FM	76 to 108	120 kHz	38	25	18	44	31	24	50	37	30	56	43	36	62	49	42
TV Band I	41 to 88	120 kHz	28	-	18	34	-	24	40	-	30	46	-	36	52	-	42
TV Band III	174 to 230	120 kHz	20	-	10	26	-	16	32	-	22	38	-	28	44	-	18
TV Band IV	470 to 944	120 kHz	41	-	31	47	-	37	53	-	43	59	-	49	65	-	55
DAB III	171 to 245	1 MHz	30	-	20	36	-	26	42	-	32	48	-	38	54	-	44
TV Band III	174 to 230	1 MHz	30	-	20	36	-	26	42	-	32	48	-	38	54	-	44
DTTV	470 to 770	1 MHz	46	-	36	52	-	42	58	-	48	64	-	54	70	-	60
DAB L Band	1447 to 1494	1 MHz	54	-	44	60	-	50	66	-	56	72	-	62	78	-	68
SDARS	2320 to 2345	1 MHz	58	-	48	64	-	54	70	-	60	76	-	66	82	-	72
MOBILE SERVICES
CB	26 to 28	9 kHz	40	27	20	46	33	26	52	39	32	58	45	38	64	51	44
VHF	30 to 54	9 kHz	40	27	20	46	33	26	52	39	32	58	45	38	64	51	44
VHF	68 to 87	120 kHz	35	22	15	41	28	21	47	34	27	53	40	33	59	46	39
VHF	142 to 175	120 kHz	35	22	15	41	28	21	47	34	27	53	40	33	59	46	39
Analogue UHF	380 to 512	120 kHz	38	25	18	44	31	24	50	37	30	56	43	36	62	49	42
RKE & TPMS 1	300 to 330	120 kHz	32	-	18	38	-	24	44	-	30	50	-	36	56	-	42
RKE & TPMS 2	420 to 450	120 kHz	32	-	18	38	-	24	44	-	30	50	-	36	56	-	42
Analogue UHF	820 to 960	120 kHz	44	31	24	50	37	30	56	43	36	62	49	42	68	55	48
GPS L5	1156.45 to 1196.45	9 kHz	-	-	20	-	-	26	-	-	32	-	-	38	-	-	44
BDS B1I	1553.098 to 1569.098	9 kHz	-	-	5.5	-	-	11.5	-	-	17.5	-	-	23.5	-	-	29.5
GPS L1	1567.42 to 1583.42	9 kHz	-	-	10	-	-	16	-	-	22	-	-	28	-	-	34
GLONASS L1	1590.781 to 1616.594	9 kHz	-	-	10	-	-	16	-	-	22	-	-	28	-	-	34
Wi-Fi / Bluetooth	2402 to 2494	1 MHz	52	-	32	58	-	38	64	-	44	70	-	50	76	-	56
Wi-Fi	5150 to 5350	1 MHz	59	-	39	65	-	45	71	-	51	77	-	57	83	-	63
Wi-Fi	5470 to 5725	1 MHz	59	-	39	65	-	45	71	-	51	77	-	57	83	-	63
V2X (Wi-Fi)	5850 to 5925	1 MHz	84	-	64	90	-	70	96	-	76	102	-	82	108	-	88

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Test Setup & Technical Overview

Detailed engineering guide for Radiated Emissions (RE) by ALSE Method

Technical Overview: Harness Radiation & Physical Meaning

Radiated Emission (RE) measurements in automotive components evaluate the electromagnetic energy unintentionally radiated by the Equipment Under Test (EUT) and its associated cabling.

In a typical vehicle, the wiring harness acts as a highly efficient antenna. RF noise generated by internal switching circuits of the electronic control unit (ECU) couples onto these cables, which then radiate electromagnetic fields into the surrounding environment. Without strict control, these radiated fields can severely degrade the reception quality of on-board radio receivers and navigation systems.

Test Configuration: ALSE Setup & Calibration

To ensure accurate and repeatable measurements, RE testing is performed inside an Absorber Lined Shielded Enclosure (ALSE). The EUT is placed on a non-conductive bench 50 mm above the ground plane.

The wiring harness must be 1500 mm in length, routed parallel to the edge of the ground plane. The receiving antenna is positioned at a fixed distance of 1 m from the harness. Unlike commercial standards where the antenna is scanned in height, CISPR 25 specifies a fixed antenna height and position, keeping the antenna parallel to the ground plane to capture worst-case near-field radiation.

Interpretation of Limits (Class 1-5)

CISPR 25 specifies five limit classes to accommodate different vehicle environments and installation configurations:

Class 5: The most stringent class, typically mandated by OEMs for safety-critical components (ADAS, steering, braking) or devices located near sensitive radio antennas.
Class 4 & 3: Applied to standard body electronics, powertrain control units, and infotainment displays.
Class 2 & 1: The least severe limits, reserved for simple, transient, or non-critical loads (e.g., seat adjusters, window motors) that present minimal risk to the vehicle's RF receivers.

How to read the CISPR 25 radiated-emission reference

User task

Use this page for the ALSE radiated-emission context of vehicle components and modules. It keeps the one-metre harness-to-antenna geometry, receiver bands and edition state visible while the Class 1–5 rows are compared.

Choose before comparing

Select the 2016 or 2021 edition before comparing a class. The cited 2016 reference context reaches 150 kHz–2500 MHz and the 2021 context reaches 150 kHz–5925 MHz; the visible rows are selected service bands rather than a continuous sweep. The radiated result is in dBµV/m with a 1 m antenna-to-harness geometry; the selected receiver band and RBW, including the 9 kHz entries shown for 2021, must stay synchronized with the edition and setup.

What the displayed rows mean

ALSE geometry and unit: The RE method uses dBµV/m and a 1 m antenna-to-harness arrangement; it is not the CEC current-probe or CEV LISN method.
Edition and RBW: The cited 2016 reference context reaches 150 kHz–2500 MHz and the 2021 context reaches 150 kHz–5925 MHz; the visible rows are selected service bands, not a continuous sweep. They are separate selections; the 2021 data exposes 9 kHz RBW entries where encoded, so the visible table and receiver context must switch together.
Harness and antenna: Antenna position/height, harness layout, EUT arrangement and detector settings are part of the ALSE comparison; a different distance changes the measurement context.

Common misread

CISPR 25 RE is not a generic one-metre field-strength promise for every vehicle setup. Keep edition, ALSE geometry, harness arrangement, detector, receiver band and RBW together.

Reference boundary

EMCCalc summarizes the public IEC Webstore records and encoded CISPR 25 RE data. The purchased edition, vehicle agreement and complete ALSE procedure remain authoritative; protected standard text is not reproduced.

Content review date: 2026-08-29

Source and verification

Primary source

IEC Webstore — CISPR 25:2016 Edition 4.0; 2016 ALSE radiated-emission table set

IEC Webstore — CISPR 25:2021 Edition 5.0; 2021 ALSE radiated-emission table set and RBW values

Applicability

Vehicle electronic/electrical components and modules for protection of on-board receivers; Class 1–5 data are selectable.

Read this limit with

ALSE method
1 m antenna-to-harness geometry
dBµV/m
Receiver bands and RBW are shown for the selected edition where encoded
Harness, antenna position/height, EUT, and detector settings must follow the selected edition and test plan

Last source-link and context review

2026-08-29

Verification method

The source link, edition/section locator, and measurement context were reviewed against the values shown here. This reference is not a formal conformity assessment or certification.

Engineering reading

Choose the applicable vehicle/component scope, standard edition, class, method, receiver setting, and full test plan before using this lookup for a compliance decision.