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* q c3 G7 Z" g E8 u! u- mStandard(s): IEC 60112/2003 No. Year: ?$ c" B. J0 l# @4 Q0 W" D0 w5 F* h
Ed. 4.06 [3 X1 s$ z' ? S: x
DSH
7 X2 H Z8 t! o1 B4 w0724$ |5 v. o- r. S
2008( u7 T g$ T+ g3 R# C4 L
Categories: Various, General
! B3 [+ D- a$ V/ ~% U2 V0 uSubclause(s): 7.32 `5 R+ {' B0 Y8 r& q9 L& D
Developed by: WG4, O H n1 H% b' a# ]
Subject: Measurement of
$ C! G' z# Q& c. Sconductivity
, I* e: [# F Z& T! NKey words:
) U/ B1 U' P' y, j# Q8 f% U5 z D- Tracking solution
% e" C+ ^' N1 d: L- Conductivity+ F1 X9 O& |, b3 T5 t$ M
- IEC 60589
3 r) f5 D* k& t6 C; @0 s$ W6 _Decision approved at the G& w4 j/ i/ f3 X6 ?
46th CTL Plenary Meeting,* C3 T0 x8 @, B' v" ^
in 20099 g3 N) y# K) e8 ^" u% n
Question:
; J' d* [+ A& CClause 7.3 requires that the conductivity of the tracking test solution “be measured with alternating
. ^8 J: @2 M0 Kvoltage at a frequency in the range 1 kHz to 2 kHz. The procedure is described in IEC 60589”.
# g. ^- z% V- ?1 m! L9 TThe procedure in IEC 60589 utilises conical flasks with reflux condensors, platinised platinum
) t$ W# h) }% |$ t* E: b9 zelectrodes, a conductivity cell and a resistance bridge. This appears to be a chemical standard rather/ T6 l- Y* M9 v1 E( B r( `
than an appropriate electrical test laboratory measurement technique.
: E/ Y3 z- Y* r4 J5 b R1 fAre CBTL:% A$ N% T, h- ?) j2 X
- (a) expected to use this method of measurement for solution conductivity; or$ q0 P/ o4 P9 p7 {$ H3 v" X) p
- (b) can a suitable conductivity meter with a measurement frequency in the range 1 kHz to 2 kHz( K7 M ~. j' B' [7 _) c5 u- t1 ^
be used; or, e: `, D) z' s
- (c) can any suitable conductivity meter (different measurement range) be used.
% _. v! b2 F0 {; L- N/ EDecision:5 B0 e- _2 R. n2 W
The Group decided that the “use of any appropriate conductivity meter with sufficient accuracy and
, _/ ?7 n7 ?4 @% K+ B1 S" suncertainty including the probe” is the only practical one - item (c) above.
' z# s; c$ t0 E) p$ e+ ^
/ N/ i6 q& o; c% a3 ~+ V9 W' `1 X' x- {& p4 p; V% L
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发表于 2012-11-8 19:53
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