DSH 613 The air speed in the low temperature test cabinet for testing voltage ma

小米

广东安规检测
有限公司提供：

小型摆管淋雨试验机

IPX5X6X7喷水试验机

1000L恒温恒湿箱

各种试验指现货

可程式恒温恒湿试验箱

水平垂直燃烧机

自动卷线器试验机

耐划痕试验机

各种灯头量规现货

灼热丝试验机现货

GB1002插头量规

IPX1-X7淋雨现货

IEC61347/UL935镇流器热试验箱

灯具防风罩

IK冲击试验机

UL498插头插座量规

VDE0620插头插座量规

稳定性试验台

家电温升测试角

针焰试验机现货

热电偶焊机现货

家电125mm试验指

E12灯头量规

无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

DSH 613 - q  ?$ L$ g3 B1 _" V0 r

The air speed in the low temperature test cabinet for testing voltage maintained thermal cut-out ! v/ j- k3 j: Z) I, |

17.16.108 - O9 \$ [7 Y) }. Y

60730-2-9(ed.1)

Question:
In practice, it is found that the test results were dramatically affected by the air speed of the cabinet when conducting the test of clause 17.16.108 of IEC 60730-2-9:2004, Ed. 2.2 in operated condition.
In the operated condition the contacts of the voltage maintained thermal cut-out remain open position by the heat generated by the PTC element. The faster the air speed in the test cabinet, the more heat generated by the PTC taken away by the air flow. This will reduce the temperature of the thermal cut-out which will make the thermal cut-out close.
Decision:
The test should be conducted in a static-air test cabinet or in a box which protects the samples from the air flow.
$ X- G+ x4 P, Z2 y. p) j! D5 Z1 k  }The required temperature (- 20°C) should be measured 50 mm beside the test samples (similar to the requirements according to clause 14.7 of IEC 60730-1)
( f. n8 B- d" L, ~- O. ^During the examination of several samples in the test cabinet or box it is to be observed that the samples don't affect themselves among each other.

0 r( m" T/ C4 b. B; n
/ y! L/ q% l7 N9 ^% h; x