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JJG 527-2015 (JJG527-2015) PDF English
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JJG 527-2015: PDF in English

JJG 527-2015
NATIONAL METROLOGICAL VERIFICATION
REGULATION OF THE PEOPLE’S REPUBLIC OF CHINA
Replacing JJG 527-2007
Fixed Radar Vehicle Speed Measurement Devices
ISSUED ON: JUNE 15, 2015
IMPLEMENTED ON: DECEMBER 15, 2015
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine
Table of Contents
Introduction ... 6 
1 Scope ... 7 
2 Normative references ... 7 
3 Terms ... 7 
3.1 fixed radar vehicle speed measurement device ... 7 
3.2 simulator for radar speed measuring device ... 7 
3.3 standard speed-measuring device for field test ... 7 
3.4 simulating speed ... 8 
3.5 simulating speed measurement error ... 8 
3.6 field test speed measurement error ... 8 
4 Overview ... 8 
5 Metrological performance requirements ... 8 
5.1 Microwave emission frequency error ... 8 
5.2 Speed measurement range ... 8 
5.3 Simulating speed measurement error ... 8 
5.4 Field test speed measurement error ... 9 
6 General technical requirements ... 9 
6.1 Appearance ... 9 
6.2 Requirements ... 9 
7 Control of measuring tools ... 9 
7.1 Verification conditions ... 9 
7.2 Verification items ... 10 
7.3 Verification methods ... 10 
7.4 Processing of verification results ... 14 
7.5 Verification cycle ... 14 
Annex A Examples for completion of field test speed measurement error under
real traffic flow status ... 15 
Annex B Recording (recommended) format for verification of fixed radar vehicle
speed measurement device ... 17 
Annex C Inner page format for verification certificate / verification result notice
of fixed radar vehicle speed measurement device ... 18 
Introduction
JJF 1002 “The Rules for Drafting National Metrological Verification Regulation”,
JJF 1001 “General Terms in Metrology and Their Definitions” and JJF 1059.1
“Evaluation and Expression of Uncertainty in Measurement” constitute the basic
series of specifications to support the revision of this Regulation. It mainly refers
to JJF 1335-2012 “Program of Pattern Evaluation of Fixed-angle Radar Speed
Measurement Devices” and JJG 1074-2012 “Vehicle Laser Speed
Measurement Device”.
This Regulation is a revision to JJG 527-2007. Compared with JJG 527-2007,
in addition to editorial modifications, the main technical changes are as follows:
- specified that this Regulation is applicable to fixed radar vehicle speed
measurement devices (see Clause 1);
- deleted verification of speed measurement range, verification of simulating
speed measurement error;
- added method that under real traffic flow status, use normal-driving vehicle
as measured object to complete verification of field test speed
measurement error (see 7.3.4);
- added example in Annex A that under real traffic flow status, to complete
verification of field test speed measurement error.
The historical versions replaced by this Regulation are as follows:
- JJG 527-2007 “Verification Regulation of Automatic Monitor System for
Vehicle Speeding”;
- JJG 527-1988 “Angled Nozzle Kadar Measuring Speedometer”.
Verification Regulation of Fixed Radar
Vehicle Speed Measurement Device
1 Scope
This Regulation is applicable to the first verification, the follow-up verification
and in-use inspection for fixed radar vehicle speed measurement devices that
use Doppler effect principle to measure vehicle’s driving speed.
2 Normative references
JJG 1074-2012, Vehicle Laser Speed Measurement Device
JJF 1335-2012, Program of Pattern Evaluation of Fixed-angle Radar Speed
Measurement Devices
GB/T 21255-2007, Motor vehicle speed detector
For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments)
applies.
3 Terms
3.1 fixed radar vehicle speed measurement device
a radar speedometer that is fixed and installed on measuring position, that is
used to measure vehicle’s driving speed
3.2 simulator for radar speed measuring device
a particular testing device that is used to receive continuous microwave signals
from radar speedometer and send Doppler microwave signal which is
corresponding to the set simulating speed
3.3 standard speed-measuring device for field test
a particular testing device that is used to measure vehicle’s driving speed
through testing area of fixed radar vehicle speed measurement device
5.4 Field test speed measurement error
When < 100 km/h, it is (-6~0) km/h;
When ≥100 km/h, it is (-6~0)%.
6 General technical requirements
6.1 Appearance
6.1.1 Fixed radar vehicle speed measurement device shall have a nameplate
to indicate product name, specification, model, number, nominal value of radar
emission frequency, manufacturer and date. It shall indicate manufacturing
license mark and number of measuring instrument.
6.1.2 Fixed radar vehicle speed measurement device shall not have mechanical
damage that affects normal use on its look. Each fastener shall not be loose;
structure shall be complete.
6.2 Requirements
6.2.1 Setting or adjusting keys of fixed radar vehicle speed measurement
device shall be used as normal. Operating keys shall be light and flexible, with
normal operation.
6.2.2 Cable and connector of fixed radar vehicle speed measurement device
shall be complete, with reliable connection.
6.2.3 Fixed radar vehicle speed measurement device shall have independent
speed display unit. After normal working, the display of display screen shall be
complete, clear and eye-catching.
7 Control of measuring tools
Control of measuring tools includes: first verification, follow-up verification and
in-use inspection.
7.1 Verification conditions
7.1.1 Environmental conditions for verification
7.1.1.1 Laboratory verification environment:
1) Temperature: (15~25)°C.
2) Relative humidity: < 85%.
methods in 7.3.1, 7.3.2, 7.3.3, verify general technical requirements, microwave
emission frequency error, speed measuring range, simulating speed
measurement error and field test speed measurement error first. Record valid
data. Then according to method in 7.3.4, verify field test speed measurement
error. In follow-up verification, microwave emission frequency error, speed
measuring range, simulating speed measurement error can be exempted from
verification.
7.3.1 Inspection of general technical requirements
After fixed radar vehicle speed measurement device is turned on, it shall be
able to work as normal. Use hand-feeling, visual inspection methods to inspect.
Results shall meet requirements of 6.1, 6.2.
7.3.2 Verification of microwave emission frequency error
Schematic diagram of microwave emission frequency verification error of fixed
radar vehicle speed measurement device is shown as Figure 1. Make receiving
antenna and microwave transmitting antenna of fixed radar vehicle speed
measurement device are on a same axis. Connect output terminal of receiving
antenna to microwave digital frequency meter.
Figure 1 -- System block diagram for verification of microwave emission
frequency error
Turn on power of microwave digital frequency meter, fixed radar vehicle speed
measurement device. Pre-heat according to instructions on use of instrument.
Make fixed radar vehicle speed measurement device continuously emit
microwaves. Read measurement values on microwave digital frequency meter.
Measure microwave emission frequency 3 times. Microwave emission
frequency error is calculated according to formula (1):
Where,
- microwave emission frequency error of fixed radar vehicle speed
Fixed radar
vehicle speed
measurement
device
Receiving
antenna Microwave digital frequency meter
Install according to use requirements for standard speed-measuring device for
field test (or standard speed-measuring device). Adjust to make it under normal
working state. Verification personnel shall, on installation road of fixed radar
vehicle speed measurement device, according to actual situation of road, select
one of the following methods to perform verification of field test speed
measurement error:
(1) Under real traffic flow status, use normal-driving vehicle as measured
object. Standard speed-measuring device for field test and fixed radar
vehicle speed measurement device shall measure the same tested object
in testing area simultaneously. Record 30 sets of valid measured values.
Each speed-measuring error shall meet requirements of 5.4. See Annex
A for specific operation.
2) Testing vehicle that is equipped with standard speed-measuring device
drives at a constant tested speed. Standard speed-measuring device
measures and displays speed when testing vehicle drives through testing
area. At the same time, fixed radar vehicle speed measurement device
measures speed of testing vehicle. Speed point of first verification is about
50%, 100% of limit speed. Perform at least two verifications for each
tested speed. Each field test speed measurement error shall meet
requirements of 5.4. Speed point of follow-up verification is about 100%
of limit speed. Perform at least 3 verifications. Each field test speed
measurement error shall meet requirements of 5.4.
In case of dispute, use the second method as arbitration verification method.
Filed speed-measuring error is calculated according to formula (2):
Where,
- field test speed measurement error, km/h;
v - measured speed of fixed radar vehicle speed measurement device, km/h;
v0 - measured speed of standard speed-measuring device for field test or
standard speed-measuring device, km/h.
Relative field test speed measurement error is calculated according to formula
(3):
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.