|
|
# Y8 r& k/ V$ q2 N3 o5 U
Standard(s): IEC 60112/2003 No. Year% Y; v# w3 a4 {
Ed. 4.0
" M% T+ J! p4 f! b1 lDSH7 K* {$ d6 D& P6 C0 _
07244 A I) u! O, q2 i+ ]! V: B$ E! U& T
2008
: v2 h0 [$ }4 \Categories: Various, General
# H4 x* L2 l z9 x1 QSubclause(s): 7.3
2 }: Z. L0 a7 C& T# [0 jDeveloped by: WG4
% X( T' p. J1 _! k. v/ LSubject: Measurement of
/ p% c& z6 o0 v/ Aconductivity! ~) f, o3 m1 ~, Y4 n, v. ]- G
Key words:
$ i c: m+ C; d5 V1 t- Tracking solution
! l6 n4 X- i4 D- m- Conductivity4 D& }; D9 i1 R u. S" `: r
- IEC 60589
4 q( Q& { I% r2 LDecision approved at the& J" K$ P. c: j: ^/ r# E5 N
46th CTL Plenary Meeting,
7 |; {9 O& y1 {7 q7 p6 Nin 2009
$ K( Q1 ]5 [3 l" i' cQuestion:
" z( }, Y0 ]4 y ` a7 y: `) IClause 7.3 requires that the conductivity of the tracking test solution “be measured with alternating
9 P8 i' \0 z- ~9 |voltage at a frequency in the range 1 kHz to 2 kHz. The procedure is described in IEC 60589”.
- N& M. M4 v0 D9 p- w" E; Z" KThe procedure in IEC 60589 utilises conical flasks with reflux condensors, platinised platinum$ f+ t. N; s9 V* y* u
electrodes, a conductivity cell and a resistance bridge. This appears to be a chemical standard rather
T# S" m6 K9 m: Fthan an appropriate electrical test laboratory measurement technique.
' S, r( Y$ Y/ ^6 p2 ~Are CBTL:) B- g/ b( z2 {8 S) H- }( Q
- (a) expected to use this method of measurement for solution conductivity; or5 c/ m# o: r0 G' i% k
- (b) can a suitable conductivity meter with a measurement frequency in the range 1 kHz to 2 kHz4 P1 d* C* [5 r: V
be used; or
7 r/ [; D; i+ Z# u- (c) can any suitable conductivity meter (different measurement range) be used.1 n) y3 g" j9 I- ^
Decision:5 d, o7 x. m4 D3 g
The Group decided that the “use of any appropriate conductivity meter with sufficient accuracy and
5 i! y9 e3 A% a1 G+ u: S3 I4 {3 t6 {uncertainty including the probe” is the only practical one - item (c) above.
; \3 p; ?4 K7 P% C8 l
' o% q$ Z0 m4 u: `7 D6 U% B
3 a7 {: i9 y' R( C9 G |
本帖子中包含更多资源
您需要 登录 才可以下载或查看，没有账号？注册安规
x
|
|关于安规|小黑屋|安规QQ群|Archiver|手机版|安规网
( 粤ICP13023453-10 ) 
窥视卡
雷达卡
发表于 2012-11-8 19:53
提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
抢沙发
千斤顶
显身卡
