DSH 546 Relative humidity

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DSH 546 # Z. I; u+ v! o" H

Relative humidity 5 y" i( i6 O- B6 L4 ~2 ^0 x

10.2 (IEC 60065/2001) 15.3 (IEC 60335-1/2001) 4.10 (60601-1/1988 +A2/1995) 6.8.2 (IEC 61010-1/2001) . N2 B8 A& T( U3 K! ~6 S/ U

60335-1(ed.4) & 61010-1(ed.2) & 60601-1(ed.2);am1;am2 & 60065(ed.7) ) J) A1 v6 T3 z/ a  W+ e

! Z) \$ V/ |# H  y+ @/ ?) q" h. dStandard(s):
IEC 60065/2001
8 m5 Q1 Y. u6 mIEC 60335-1/2001
5 H9 _8 r2 U  ^: V. IIEC 60601-1/1988 + A2/1995
8 }$ A) l4 I- f& i0 }IEC 61010-1/2001
8 s1 {5 _0 o! v& eSub clause(s):
1 C$ Z. H4 G2 h10.2
15.3
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5 K# p& N7 K5 oSheet N°:
DSH - 546
Subject: Relative humidity Key words:
, g4 G+ b, x; M+ J- Relative humidity
- Range
- Percentage
3 n3 P) z% U& {3 n- IECEE-CTL/193/INF
Decision taken at the
9 V: A: z% ?7 h' g4 ?/ G41st CTL meeting.
/ O% z. P. W  T% j/ f7 z# v5 f3 nQuestion:
Various IEC standards require that specific tests be performed in a humidity chamber. The
! ~% n1 S3 I" S% d: a1 q- Ospecification of the relative humidity is in several formats. How should the tolerance on the
relative humidity specification be interpreted?
Decision:
$ @' ]$ f/ f7 \& y1 @2 l9 x& `(1) Unless clearly noted otherwise, the tolerance specified for humidity is considered to
, ~( f, `9 s) p/ Z; {7 _be in percent relative humidity, % RH.
6 \, c' c! B- q! f(2) It is intended that the set point of the humidity chamber controller be set within the
specified range and that the humidity remains within the specified range.
; w1 b$ P- U* G& B; Y1 a(3) Confirmation that humidity is within the specified range shall be made by a humidity
measuring instrument according to CTL DSH 251A.

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