Federal Institute of Metrology METAS
EMC requirements for OIML recommendation R91
Measurement systems for speed and red light surveillance for official use of the police
Version 1.0
1 Introduction
This documents provides emc requirements for
 speed surveillance of vehicles,
 red lights surveillance
 and other traffic measurement instruments.
It defines:
 the immunity tests
 the immunity levels
 the functional requirements
Following documents have been read and studied
 IEC 61000-6-2 Ed.2.0 Part 6-2: “Generic standards – Immunity for industrial environments”, 2005.
 OIML D11 Edition 2013: “General requirements for measuring instruments - Environmental conditions”, 2013.
 PTB-A 18.11 “Messgeräte im Straßenverkehr, Geschwindigkeitsmessgeräte in
Kraftfahrzeugen – Video-Nachfahrsysteme“, Dezember 2013.
Some of the requirements have been considered as too high and have not been included in
this document. This is mentioned in notes in this document.
The form of this document is short. Whenever included in a future OIML recommendation,
we recommend adapting its form to fit the OIML layout.
Frédéric Pythoud, Beat Mühlemann, the 13. March 2014.
Draft version
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2 Overview of the immunity requirements for Traffic
Basic Standard
ESD
RF-Fields
Burst
Surge
Injection
Magnetic Field
Interruptions
/ Dips
Automotive Transients
IEC 61000-4-2
IEC 61000-4-3
IEC 61000-4-4
IEC 61000-4-5
IEC 61000-4-6
IEC 61000-4-8
IEC 61000-4-11
For Products with
AC Mains
power
110 V /
230 V
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Vehicle
battery
power
Separated
battery
power
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ISO 7637-2
ISO 7637-3
3 Detailed requirements
3.1
Detailed emc immunity requirements
Test
ESD
Required
Standard:
IEC 61000-4-2
(2008)
Value: ±6 kV contact
±8 kV air
RF-Fields
Criterion: B
Standard:
Part 1:
Part 2:
Part 3:
Part 4:
IEC 61000-4-3
(2006+A1:2007+A2:2010)
80 MHz to 1000 MHz, 20 V/m instead 10 V/m, 80% AM (1kHz)
1.0 GHz to 2.0 GHz, 20 V/m instead 3 V/m, 80% AM (1kHz)
2.0 GHz to 2.7 GHz, 20 V/m instead 1 V/m, 80% AM (1kHz)
2.7 GHz to 6.0 GHz, 20 V/m, 80% AM (1 kHz)
Comment: for systems with WLAN (less or equal to 200 mW ERP) following requirements apply:
1. The system must be tested with WLAN inclusive
2. WLAN must be in function (data transfer).
3. WLAN system must also be immune to the radiated field (with the exception of
its working band:
 2350 MHz to 2550 MHz for 2.4 GHz systems
 5100 MHz to 5800 MHz for 5 GHz systems
Criterion: A
Draft version
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Test
Burst
Required
Standard:
IEC 61000-4-4
(2012)
Values: ±1kV (signal lines > 3m)
±2 kV (permanent DC lines > 3m)
±2 kV (AC lines)
tr/th 5/50 ns
Rep. freq. : 5 kHz (100 kHz foreseen since end of 2014)
Surge
Criterion: B
Standard : IEC 61000-4-5
(2005)
Values : tr/th 1.2/50 us, (8/20) us
±2 kV line to earth (signal lines > 30 m) (*)
±1.0 kV line to earth (permanent DC lines) (*)
±0.5 kV line to line (permanent DC lines) (*)
±2 kV line to earth (AC lines)
±1 kV line to line (AC lines)
Criterion: B
Injection
See Note 1.
Standard : IEC 61000-4-6
(2013)
Values : 0.15 MHz to 80 MHz
20 V instead of 10 V
80% AM (1kHz)
signal lines > 3m, DC lines, AC lines
Magnetic
Field
Criterion: A
Standard : IEC 61000-4-8
(2009)
Values: 30 A/m at 50 Hz.
Criterion: A
Interruptions
/ Dips
See Note 2.
Standard :
IEC 61000-4-11
(2004)
Dips : 0%, 1 Cycle (Criterion B)
40%, 10/12 Cycles at 50/60 Hz(Criterion C)
70%, 25/30 Cycles at 50/60 Hz(Criterion C)
Interrupts: 0%, 250/300 Cycles at 50/60 Hz
(Criterion C)
Voltage Variations (not emc specific test): for a product specification [Unom2,Unom1]:
Upper limit: Unom1 + 10%
Lower limit: Unom2 - 15 %
Automotive
Transients:
electrical
transient
on supply
lines
Draft version
See Note 3.
Standard :
ISO 7637-1:2002+A1:2008 / ISO 7637-2:2011
Required :
Test level IV(Values below for 12 V system)
FPSC
Pulse 1:
Pulse 2a:
Pulse 2b:
Pulse 3a:
Pulse 3b:
- 150 V
+ 112 V
+ 10 V
- 220 V
+ 150 V
II
II
II
I
I
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Test
Automotive
Transients:
Required
Standard :
ISO 16750-1:2006 / ISO 16750-2:2010
Required :
electrical
transient
on supply
lines
Automotive
Transients:
electrical
transient
on lines
other than
supply lines
Test level III (Values below for 12 V system)
Pulse according to 4.6.3:
US6 = 3 V
Functional
Status
B
Standard:
ISO 7637-3:2007 / ISO 7637-2:2011
Required
Coupling
Test level IV
(Values below for 12 V system)
FPSC
Fast Pulse a
Fast Pulse a
DCC
CCC
- 60 V
- 60 V
I
I
Fast Pulse b
Fast Pulse b
Slow Pulse +
Slow Pulse Slow Pulse +
Slow Pulse -
DCC
CCC
DCC
DCC
ICC
ICC
+40 V
+40 V
+30 V
- 30 V
+6 V
-6V
I
I
I
I
I
I
Notes
1. Additional in OIML D11
 OIML considers length of 10 m as minimal length.
 OIML considers length of 2 kV and 1 kV for DC lines.
 OIML considers ±1 kV line to line (unsymmetrical signal lines > 30 m)
These requirements have not been considered for this specification. They are in contradiction with industry requirements from the standard IEC 61000-6-2.
2. Additional in OIML D11
 OIML considers 100 A/m instead of 30 A/m.
 OIML considers testing short duration up to 1000 A/m.
Both of the above requirements are totally exaggerated and therefore were not considered.
3. Additional in OIML D11
 OIML considers 0%, 0.5 Cycle.
 OIML considers 80%, 250/300 Cycles at 50/60 Hz.
Both of the above requirements are not considered as meaningful. They have therefore
not been considered.
Draft version
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3.2
Functional Status
Functional status according to IEC 61000-6-2:2005
Criterion A:
Criterion B:
The apparatus shall continue to operate as intended during and after the test. No degradation of performance or loss of function is allowed.
The apparatus shall continue to operate as intended after the test. During the test,
degradation of performance is however allowed but no registration of erroneous data
is accepted. No change of actual operating state or stored data is allowed.
Criterion C: Temporary loss of function is allowed, provided the function is
self-recoverable or can be restored by the operation of the controls.
Functional Performance Status Classification (FPSC) according to ISO 7637-1 (2002+A1:2008)
Status I:
The function performs as designed during and after the test.
Status II:
The function does not perform as designed during the test, but returns automatically to
normal operation after the test.
Status III:
The function does not perform as designed during the test and does not return to normal operation without a simple driver/passenger intervention, such as turning off/on
the DUT, or cycling the ignition switch after the disturbance is removed.
Status IV:
The function does not perform as designed during and after the test and cannot be
returned to proper operation without more extensive intervention, such as disconnecting and reconnecting the battery or power feed. The function shall not have sustained
any permanent damage as a result of the testing.
Functional Status according to ISO 16750-1:2006(E)
Class A:
All functions of the device/system perform as designed during and after the test.
Class B:
All functions of the device/system perform as designed during the test. However, one
or more of them may go beyond the specified tolerance. All functions return automatically to within normal limits after the test. Memory functions shall remain class A.
It shall be specified by the vehicle manufacturer which function of the DUT must perform as designed during the test and which function can be beyond the specified tolerance.
Class C:
One or more functions of a device/system do not perform as designed during the test,
but return automatically to normal operation after the test..
Class D:
One or more functions of a device/system do not perform as designed during the test
and do not return to normal operation after the test until the device/system is reset by
simple “operator/use” action.
Class E:
One or more functions of a device/system do not perform as designed during and after
the test and cannot be returned to proper operation without repairing or replacing the
device/system.
Draft version
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