DSH 546 Relative humidity

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DSH 546 " F# c: c) @6 U! l) d0 B5 J: H/ J

Relative humidity / b9 p. L# w" `+ G$ I' ^0 ]0 o

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)

60335-1(ed.4) & 61010-1(ed.2) & 60601-1(ed.2);am1;am2 & 60065(ed.7)

7 M. z) j. g! \- Q/ i; s# I( ?Standard(s):
IEC 60065/2001
IEC 60335-1/2001
IEC 60601-1/1988 + A2/1995
IEC 61010-1/2001
Sub clause(s):
10.2
15.3
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6.8.2
7 i" v4 M* l: K' j0 A# I$ jSheet N°:
DSH - 546
Subject: Relative humidity Key words:
- Relative humidity
- Range
3 l6 _4 S! W- K) O$ P8 ^- Percentage
& T: x, t  N; y0 E4 N( I$ Z8 g- IECEE-CTL/193/INF
Decision taken at the
41st CTL meeting.
6 _$ L3 {9 p8 k: F" eQuestion:
Various IEC standards require that specific tests be performed in a humidity chamber. The
specification of the relative humidity is in several formats. How should the tolerance on the
relative humidity specification be interpreted?
3 Z/ E# s4 ~' R/ ?$ e8 y9 a2 aDecision:
$ ?! A8 }# c, I, \5 @) O(1) Unless clearly noted otherwise, the tolerance specified for humidity is considered to
be in percent relative humidity, % RH.
. B* R& G0 D7 j$ @& @(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.
(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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