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) ' [0 E, ~: a2 \

0 u  d4 k1 X, B8 T$ a, LStandard(s):
IEC 60065/2001
IEC 60335-1/2001
6 t! T5 S! T3 Q. X: GIEC 60601-1/1988 + A2/1995
* H. Q2 x( Y5 B, Q& N) y! rIEC 61010-1/2001
Sub clause(s):
: h4 G: Z+ y1 D- `3 R& y10.2
6 E& g6 ]4 C- A3 O6 M# c7 _15.3
4.10
  u4 @" B5 m; S) J: o- [6.8.2
Sheet N°:
DSH - 546
Subject: Relative humidity Key words:
- Relative humidity
- Range
) S" l5 j. v' [5 j* g, Y- Percentage
- IECEE-CTL/193/INF
Decision taken at the
* o5 h% @1 Y- @& L3 B, b41st CTL meeting.
; O& x$ E$ F7 ^: g- y8 ZQuestion:
Various IEC standards require that specific tests be performed in a humidity chamber. The
: I, F# Q7 f7 d% ]. y: @3 M/ Rspecification 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.
, Q" v% D+ C- N. x" }- @( W(2) It is intended that the set point of the humidity chamber controller be set within the
9 L& X; y6 j7 t+ I& }# w7 Ispecified 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.
8 A1 K, B) W7 q8 U
% N* ]9 e% r' B4 t% C, F/ y
+ ~5 p- Z* t% B; t0 ]$ W9 F