DSH 546 Relative humidity

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DSH 546

Relative humidity

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) # ?! k" I- ^: o- s

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Standard(s):
IEC 60065/2001
IEC 60335-1/2001
IEC 60601-1/1988 + A2/1995
IEC 61010-1/2001
Sub clause(s):
10.2
9 J/ ^4 O2 g* g15.3
4.10
6.8.2
Sheet N°:
DSH - 546
Subject: Relative humidity Key words:
- Relative humidity
- Range
& G- ]8 ]3 o* I3 ^/ i1 K3 d5 F- Percentage
- IECEE-CTL/193/INF
Decision taken at the
41st CTL meeting.
  c* w# J! {  f; W; fQuestion:
Various IEC standards require that specific tests be performed in a humidity chamber. The
$ P3 k4 U# b% L3 K2 c4 lspecification of the relative humidity is in several formats. How should the tolerance on the
relative humidity specification be interpreted?
Decision:
(1) Unless clearly noted otherwise, the tolerance specified for humidity is considered to
be in percent relative humidity, % RH.
* G9 C0 q) v7 V" ~(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.
$ H; @# Z: K6 l- [+ p(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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