Parts of electrical and electronic equipment may be exposed to overheating stress due to the action of electricity, and its deterioration may reduce the safety performance of the equipment. These parts should not be excessively affected by heat and fire generated inside the equipment. Parts of insulating materials or other solid combustible materials which are easy to spread flames inside the equipment may be ignited by glow wires or glow elements. Under certain conditions, such as fault current flowing through wires, overload of components and ignition of hot components with poor contact.Non-touch control mode of glow wire testing machine
Thisglow wire tester>simulates the thermal stress caused by the heat source or ignition source such as hot element or overload resistor in a short time under fault or overload condition, so as to evaluate the fire risk of products. It is suitable for fire hazard test and combustion performance test of electrical and electronic products, household appliances and their materials. This glow wire test machine is based on IEC60695 - 2 - 10 / 11 / 12 / 13, IEC60669-1, IEC60884-1, UL1598, GB5169.10, GB5169.11 And GB4706.1. Safety of household and similar electrical appliances Part I: Design and manufacture in accordance with relevant provisions specified in General Requirements.
Test operation method of glow wire tester:>
Precautions: During the test, personal safety protection measures should be taken to prevent the inhalation of dangerous smoke and/or toxic products from burning or explosion;
A. before the test, the residue of the previous tested material on the top of the glow wire must be removed, such as using a wire brush.
B. Install the test sample to the sample fixture. The fixation of the test sample should not be obvious due to support or firmness. The installation of the test sample should ensure that the contact surface at the top of the glow wire is perpendicular to the protection; The top of the glow wire is applied to the surface of the test sample that may be subjected to the same thermal stress during normal use; If the place suffering from thermal stress is not specified in detail during normal use of the equipment, the top of glow wire shall be applied at the thinnest part of the test sample, and it is better to be at least 15mm from the upper edge of the test sample.
C. Plug the power cord into the AC220V power socket and turn on the power switch. If the voltage fluctuates greatly, please provide a regulated power supply;
D. Press the quot;test startquot; switch, and each instrument is powered on;
E. set the timer (t1) for glow wire application time for 30s, and set it to quot;30S00quot;;
F. set the timer (T2) for the sample light-off time for 30s, and set it to quot;30S00quot;;
G. set the timer (T3) for the burning time of the sample for 50s, and the setting is displayed as quot;50S00quot;;
H. press the quot;run startquot; switch, and the hot trolley will start to move to the right. when it reaches the limit switch, the hot trolley will stop moving forward. make sure that the installation sample can contact with the hot probe in place and there is a virtual distance of 7mm. press the quot;run stopquot; at any time during the movement of the hot trolley; Hot cars can be suspended at any time;
I. heating of glow wire: press the quot;heating startquot; key, the glow wire starts to heat up, and rotate the quot;current adjustmentquot; knob to make the glow wire temperature reach the test specified value. the relationship between glow wire temperature and current is roughly as follows:
J. Before starting the test, care must be taken to ensure that the temperature and heating current remain constant for at least 60S, and keep a certain distance from the test sample through glow wire during this time or during the calibration process, or use a suitable shield to ensure that the test sample will not be affected by heat radiation.
|Glow wire temperature>
|Glow wire current>