Document ID: chunk:federal_register_of_legislation:F2022C01070:body:0:p10
Version: federal_register_of_legislation:F2022C01070
Segment Type: other
Provision Reference: 
Character Range: 27722–30510

standard audible warning device may additionally be actuated by the VAS, provided that any tampering with the standard audible warning device (generally more easily accessible) does not affect the operation of the additional audible warning device.
6.2.2. Duration of the audible signal
 Minimum :  25 s
 Maximum :  30 s.
 The audible signal may sound again only after the next interference with the vehicle, i.e. after the above-mentioned time span.
 (Restrictions : see paragraphs 6.1.1. and 6.1.2. above).
 Unsetting of the alarm system shall immediately cut the signal.
6.2.3. Specifications concerning the audible signal.
6.2.3.1. Constant tone signal device (constant frequency spectrum), e.g. horns : acoustical, etc... data according to ECE Regulation No. 28, Part. I.
 Intermittent signal (on/off) :
 Trigger frequency   (2 ± 1) Hz
 On time = off time ± 10 %
6.2.3.2. Audible signal device with frequency modulation :
 acoustical, etc... data according to ECE Regulation No. 28, Part I but equal pas-sage of a significant frequency range within the above-mentioned range (1,800 through 3,550 Hz) in both directions.
 Passage frequency   (2 ± 1) Hz
6.2.3.3. Sound level
 The sound source shall be :
 either an audible warning device approved under ECE Regulation No. 28, Part I
 or a device meeting the requirements of ECE Regulation No. 28, Part I, paragraph 6.1. and 6.2.
 However, in the case of a different sound source from the original equipment audible warning device, the minimum sound level may be reduced to 100 dB(A), measured under the conditions of ECE Regulation No. 28, Part I.
6.3. Optical alarm - if fitted
6.3.1. General
 In the event of intrusion into or interference with the vehicle, the device shall activate an optical signal as specified in paragraphs 6.3.2. and 6.3.3. below.
6.3.2. Duration of the optical signal
 The optical signal shall have a duration between 25 s and 5 min. after the alarm has been activated.
 The unsetting of the alarm system shall immediately stop the signal.
6.3.3. Type of optical signal
 Flashing of all direction indicators and/or passenger compartment light of the vehicle, including all lamps in the same electrical circuit.
Trigger frequency   (2 ± 1) Hz
 In relation to the audible signal, also asynchronous signals are allowed.
 On time  =  off time ± 10 %
6.4. Radio alarm (pager) - if fitted
 The VAS may include a facility generating an alarm signal by radio transmission.
6.5. Alarm system setting lock
6.5.1. When the engine is in its running mode, deliberate or inadvertent setting of the alarm system shall be impossible.
6.6. Setting and unsetting of the VAS
6.6.1. Setting
 Any suitable means of setting of the VAS is allowed, provided that such means does not inadvertently cause false alarms.
6.6.2. Unsetting