1、 Overview

The ZTT-301V Retroreflective Line Measuring Instrument is a professional measuring instrument developed by Beijing Tiandi Xinghuo Technology Development Co., Ltd. for measuring the reflective performance of road markings. The measured parameter is the reflection coefficient R 'or specific brightness of the marking, in units of mcd · lx-1 · m-2. This instrument is easy to operate and has reliable measurement values. It is suitable for both laboratory environments and on-site measurements. It is a preferred instrument for production, quality supervision, engineering construction, and supervision units to measure the retroreflective performance of road markings.

2、 Main functional features and technical parameters

1. Product basis and standards

This instrument is designed and developed in accordance with relevant international technical documents, as well as current national standards and specifications in China. Comply with the requirements of relevant standards published by the International Commission on Illumination (CIE), such as No. 72, ASTM D4061-94 in the United States, DIN6752067521 in Germany, GB/T 26377-2010 "Retroreflective Measuring Instruments" in China, GB/T 16311-2009 "Quality Requirements and Monitoring Methods for Road Traffic Markings", JJF 1809-2020 "Calibration Specification for Retroreflective Measuring Instruments", and JJG (Traffic) 059-2004 "Verification Regulations for Retroreflective Measuring Instruments".

2. Product Features

1. One-off calibration of white and yellow standard coefficients for long-term use

2. Color touch screen display

3. With voice broadcasting function

4. Temperature and humidity display mode

5. Data storage function (built-in data storage card can be connected to the computer to export and store data)

6. Aluminum alloy host, rust proof

7. The overall size of the host is small and exquisite, making it easy to carry

8. Can measure the line retroreflection coefficient under wet (rainy night) and dry conditions

3. Measurement principle

The geometric condition of the ZTT-301V retroreflective marking instrument is to simulate the scene where a car's headlights illuminate the retroreflective material on the road surface during nighttime driving, and after reflection, it is observed by the driver in the driver's cab. The schematic diagram of its optical path is shown in the following figure.

The angle between the optical axis of the headlight and the normal (reference axis) of the road surface becomes the incident angle（ β）， The specified angle is 88.76 °, and the angle between the optical axis of the headlamp and the backlight is called the observation angle（ α)，  The specified value is 1.05 °. Light source, optical system according to incidence angle β The size of the measured line is 200 X 95mm, and the light reflected from the line is observed at an angle of 1.05 ° α， Transmitted to V equipped（ λ） The measured value of the retroreflection coefficient R 'is obtained by detecting and collecting it inside the filter and processing it on the measurement value display.

4. Main parameters

Observation angle of the instrument α= 1.05 °, incidence angle β= 88.76 °, complementary angle is 1.24 °.

The color temperature of the light source is 2856K ± 50K (CIEA light source)

The detector is a silicon diode+V（ λ） Corrector, corrected by a filter, meets the CIE standard photometric observer spectral optical efficiency V（ λ） Requirements.

The measurement range of the reflection coefficient R 'is 0-3000 mcd · lx-1 · m-2

Battery continuous working time: ≈ 72 hours

Data storage: 10000 test messages

Screen: 4.5 "854x480 (touch screen)

Computer connection method: TF memory card

Charging method: 220VAC 50HZ; DC8.4V

Power supply: lithium battery (6600mAh)

Protection level: IP54

Operating temperature: -15 ° C~+50 ° C

Storage temperature: -30 ° C~+85 ° C

Operating humidity: 10~90%, no condensation

Volume (length x width x height): 450mm x 130mm x 110 mm

Net weight: 3.8kg (main engine)

Packaging box: high-end instrument special box