|
|
|  DSH 724
% s. Y! h- ]" G( T' }$ M8 S$ |! b
| Measurement of Conductivity
8 P- U$ M8 Z) t5 i4 v* x | 7.39 r% h s& E( d) g, Q- P0 T1 R* Z
| 60112(ed.4)
0 E) i4 |; t. b( l8 j$ A' G% n |
+ R7 V6 d$ k6 r" f+ b8 ?1 QQuestion:3 |8 Z1 C6 B$ m/ ]% w* ?4 ^
Clause 7.3 requires that the conductivity of the tracking test solution “be measured with alternating voltage at a frequency in the range 1 kHz to 2 kHz. The procedure is described in IEC 60589”. The procedure in IEC 60589 utilises conical flasks with reflux condensors, platinised platinum electrodes, a conductivity cell and a resistance bridge. This appears to be a chemical standard rather than an appropriate electrical test laboratory measurement technique.
& O2 b: q' B7 n2 z2 ZAre CBTL:
& \& \' c7 c. e( w. ?" B3 l- (a) expected to use this method of measurement for solution conductivity; or6 F. _) X" H& {
- (b) can a suitable conductivity meter with a measurement frequency in the range 1 kHz to 2 kHz be used; or" @! M( x5 Q$ ^4 [, T0 o
- (c) can any suitable conductivity meter (different measurement range) be used.
$ D4 P1 j& O! i" XDecision:* v- i, h1 E: P% L9 w
The Group decided that the “use of any appropriate conductivity meter with sufficient accuracy and uncertainty including the probe” is the only practical one - item (c) above.' D7 O$ p p8 P7 Q) W( Z% Y2 @9 c
5 z8 j" G N# f+ U$ j0 U
9 ]( y3 ?5 a. d6 x |
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
|
/1 
|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 2012-9-5 10:19
提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
抢沙发
千斤顶
显身卡