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请问如下这个测试怎么做啊
! D7 C. j9 Y9 {# V4 K/ C' s8 y8 c18 Limited Short-Circuit Test
- @& \* c; a; L8 Z* J18.1 General B3 i5 A4 F$ \- w2 ?
18.1.1 Following the test specified in 18.2.1 or 18.3.1, a thermistor shall:- ]# q; ~ y1 _3 j! Z& \
a) Comply with the requirements in 11.1.2 or be in a permanently high resistance state; and3 Z+ s& M5 j1 T: O
b) Complete the test without igniting the cotton indicator or opening the ground fuse described in6 S* J( d' F. ^3 f2 {3 M
18.1.4 and 18.1.5.1 M5 s9 l- `( X
18.1.2 When the results of the Limited Short-Circuit Test on the thermistor itself comply with 18.1.1, the
% l5 W8 I" h b* m* O1 [test is not required to be repeated during the investigation of the end product.
, f# g& k! {5 v+ `/ {% D2 j3 i18.1.3 Three samples of a control thermistor are to be subjected to this test. The test is to be conducted
( I2 p' S6 y, e- e6 [at rated voltage (Vr).) ^& R; Z$ p" G' n% T5 f, x$ W& p
18.1.4 A ground fuse is to be connected between the metal enclosure, metal mounting surface, or metal
# v) h* ?. @+ ?2 Rscreen described in 18.1.5 and the unswitched line to indicate an arc-over to the enclosure or mounting
s2 `! M9 F( L# Asurface. Where each line is switched, the fuse is to be connected between the enclosure, mounting
7 c! _0 U' k" m7 tsurface, or screen and the live pole least likely to arc to ground. The fuse is to be a 3.0 A nontime-delay' ^' Q2 k9 b6 G' ?7 W
fuse having a voltage rating not less than the rated voltage (Vr) of the thermistor.+ J& D, `+ k ~' I4 r
18.1.5 Cotton not less than 12.7 mm (1/2 in) thick is to surround a metal screen enclosing the thermistor
! a: E }) T0 p" A. W" f6 O0 I, Oat a distance not more than 12.7 mm from all parts of the thermistor.3 s v v1 V& x6 Y$ h, u _6 W* F
18.1.6 The cotton is to be surgical cotton, such as commonly used for medical purposes. |
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发表于 2017-10-17 15:50
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