DSH 546 Relative humidity

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DSH 546

Relative humidity ) m( a1 s: O* v' c, d: {7 [

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)

# o$ H. P5 H( TStandard(s):
& i/ M7 q9 z' k9 `7 X% n% bIEC 60065/2001
IEC 60335-1/2001
IEC 60601-1/1988 + A2/1995
% ]0 j8 n+ I2 R) F6 V0 o) B, Q7 CIEC 61010-1/2001
; P4 k& _; `4 CSub clause(s):
# f- e/ |- }3 D( H3 N2 v1 D10.2
* ?6 A9 T8 `+ p" f7 v15.3
3 E. m4 s. H% M) F. J- }: y0 W% Y4.10
5 Y  w5 x. Q% J' C6.8.2
Sheet N°:
9 w2 d6 C9 q# ~' V) C4 @5 E6 `DSH - 546
% S; k3 d/ p( h2 sSubject: Relative humidity Key words:
- Relative humidity
- Range
- Percentage
- IECEE-CTL/193/INF
Decision taken at the
% p, Y8 J6 u( i9 g  j' c2 X41st CTL meeting.
- v1 Y4 D# n; p4 p* \( F6 Y+ B0 }Question:
$ o+ ?! r+ F. m( pVarious 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
( O& \# z, Q* ^8 w0 c7 V8 m4 `relative humidity specification be interpreted?
$ U; i1 N. x8 xDecision:
(1) Unless clearly noted otherwise, the tolerance specified for humidity is considered to
be in percent relative humidity, % RH.
(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.
- s, W* c' C% T; @6 P% B(3) Confirmation that humidity is within the specified range shall be made by a humidity
: M( \! T  h- f" N3 T- U0 ~measuring instrument according to CTL DSH 251A.
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. L0 |, u, Z3 w) Q0 a