加工定制:否 | 品牌:Wazau | 型号:WAZAU |
分辨率:1 | 尺寸(mm):1 | 测量精度:1 |
测量范围:1 | 用途:1 | 电源:1 |
德国***IEC60950热丝引燃试验仪,由德国Wazau公司制造,产品满足IEC60950等***
简要介绍:设备进行试样燃烧性的描述,一个热丝将试样环绕5圈加热,直到样品被点燃或者加热超过120秒
Hot Wire Ignition Test EN 60950
1. Description
This devices serves the characterization of the ignitibility of samples.
A heating wire is wrapped around a sample five complete turns and heated up.
The test is continued until the specimen ignites or after 120 s have passed.
2. Setup
Before using the device for the first time the power cord must be connected to the power supply. The voltage input for the supply voltage is an universal input for voltages ranging from 85–264 VAC (47–63 Hz). The device is turnt on by means of the main switch on the rear side. The maximum voltage on the heating wire is 11.5 V with a maximum current of 10 A. The timer is limited to 120 s.
3.Test winding:
A 250 mm±5 mm length of nichrome wire (nominal composition 80% nickel, 20% chromium, iron-free) of approximately 0.5 mm diameter and having a cold resistance of 5,28Ω/m is used.
4.Samples:
Five samples of each material are tested. The samples are 130 mm long minimum by 13 mm wide and of a uniform thickness. Edges are to be free from burrs, fins,etc.
5. Conducting a test
Turn on the device on the rear side. The device is now in a stop mode with no voltage applied on the wire connections (picture 1).
Take the supplied wire according to EN 60950 and make it 250 mm±5 mm long. The wire has to be connected in a straight length to the wire connections (picture 2). Push the button START and adjust the voltage by means of the potentiometer to the desired value. The power dissipation of the wire must be 0.26 W/mm±4% for a period of 8–12 s (picture 3). Once this step is completed push the button STOP and DO NOT change the voltage anymore by means of the potentiometer!!
Wire: l = 250 mm
R = 5.28Ω/m
P = 0.26 W/mm R = 5.28Ω/m
P = 0.26 W/mm x 250 mm R = 5.28Ω/ 4
P = 65 W R = 1.32Ω
U =√P x R I = P / U
U =√65 W x 1.32ΩI = 65 W / 6.3 V
U = 9.3 V I = 7 A