DSH 724 Measurement of Conductivity

小米

广东安规检测
有限公司提供：

小型摆管淋雨试验机

IPX5X6X7喷水试验机

1000L恒温恒湿箱

各种试验指现货

可程式恒温恒湿试验箱

水平垂直燃烧机

自动卷线器试验机

耐划痕试验机

各种灯头量规现货

灼热丝试验机现货

GB1002插头量规

IPX1-X7淋雨现货

IEC61347/UL935镇流器热试验箱

灯具防风罩

IK冲击试验机

UL498插头插座量规

VDE0620插头插座量规

稳定性试验台

家电温升测试角

针焰试验机现货

热电偶焊机现货

家电125mm试验指

E12灯头量规

无绳壶无绳电熨斗插拔寿命试验机

IEC60335试验指甲

DSH 724

Measurement of Conductivity ! A2 K3 g* K$ h* P* F6 z+ ^2 ?

7.3 ' G$ t: z/ g" X; T, {! C

60112(ed.4)

Question:
* u' q4 F: @# x1 t3 cClause 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.
Are CBTL:
- (a) expected to use this method of measurement for solution conductivity; or
5 E- g' K3 j: E" C+ A- (b) can a suitable conductivity meter with a measurement frequency in the range 1 kHz to 2 kHz be used; or
4 Z/ _# J7 z& g+ ]/ e: S% [" L- (c) can any suitable conductivity meter (different measurement range) be used.
" F' `! y* ]3 j; G5 }# s* L6 iDecision:
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.

7 F# l; E( M8 b1 h, i  |$ t' u
5 f2 b& O2 t) T/ T3 Y1 L+ H