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请问如下这个测试怎么做啊
4 L" R% `; W* W- t$ w9 B18 Limited Short-Circuit Test
G7 M- A2 a0 O& g. f+ L18.1 General
: E; b, Y4 ^0 W4 Q3 k% C8 O18.1.1 Following the test specified in 18.2.1 or 18.3.1, a thermistor shall:" }' U& O% x* U! s4 W( u
a) Comply with the requirements in 11.1.2 or be in a permanently high resistance state; and0 s! L* e. {1 ^! F- B
b) Complete the test without igniting the cotton indicator or opening the ground fuse described in
9 _! X6 E! F5 g J18.1.4 and 18.1.5.6 N* V& d; K' {6 r. S
18.1.2 When the results of the Limited Short-Circuit Test on the thermistor itself comply with 18.1.1, the
- {6 \& o: J% f5 Btest is not required to be repeated during the investigation of the end product.# t' m5 V9 e* n D q$ o
18.1.3 Three samples of a control thermistor are to be subjected to this test. The test is to be conducted
1 v1 @; O5 M( ^; H+ Qat rated voltage (Vr).
% U* {* [" A! U. A- U" ~18.1.4 A ground fuse is to be connected between the metal enclosure, metal mounting surface, or metal
$ r R5 @, ~; F) {2 Dscreen described in 18.1.5 and the unswitched line to indicate an arc-over to the enclosure or mounting+ _: W1 O4 f+ H' a. q
surface. Where each line is switched, the fuse is to be connected between the enclosure, mounting( D1 h7 W7 H( n, I
surface, or screen and the live pole least likely to arc to ground. The fuse is to be a 3.0 A nontime-delay
5 ?) m- c5 B1 j" Dfuse having a voltage rating not less than the rated voltage (Vr) of the thermistor.; T( B/ ^) i0 j/ r$ @/ ^8 ^9 ?& c% R
18.1.5 Cotton not less than 12.7 mm (1/2 in) thick is to surround a metal screen enclosing the thermistor$ e! k% |% z9 t ` T- k
at a distance not more than 12.7 mm from all parts of the thermistor.7 l3 X% ? V8 i
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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