|
|
|  DSH 724
. ?) {" k, f$ B- f1 F9 O6 M; ~4 \6 W. e! o9 F
| Measurement of Conductivity$ K1 t1 `- m2 d# |
| 7.30 y% G: J2 a8 P. g) l9 Q
| 60112(ed.4)
5 u9 _% h* R" H$ o* l6 T1 y |
7 S1 ^0 Q8 P3 ]Question:& ~$ @3 w# M J
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.
5 h7 k1 C$ w9 `7 t& p! vAre CBTL:5 ^- T3 L" Q; @5 L$ r. i V+ j
- (a) expected to use this method of measurement for solution conductivity; or
, Z7 K/ ?: `" S# l" C9 @- (b) can a suitable conductivity meter with a measurement frequency in the range 1 kHz to 2 kHz be used; or/ l2 n% G2 [8 V; z/ V |
- (c) can any suitable conductivity meter (different measurement range) be used.2 A# k' x9 U2 P. U
Decision:& Y, k6 f: e9 A0 y, j
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.
# u" \% M) S* _! n h, ~1 O+ j. A3 R0 h8 K3 y: I* n8 v
" l4 \: h5 ^" R
|
本帖子中包含更多资源
您需要 登录 才可以下载或查看，没有帐号？注册安规
x
|
/2 
|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
收藏
分享
好帖
鸡蛋
提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
抢沙发
千斤顶
显身卡