DSH 624/07 Humidity test requirements

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DSH 624/07

Humidity test requirements

Various

60335-1(ed.4);am1;am2 & 61010-1(ed.2) & 60601-1(ed.3) & 60950-1(ed.2) & 60065(ed.7);am1 & ~; J# V' b# z3 t

Question: Various IEC standards have requirements for humidity/temperature conditioning, but have different specifications for the test conditions.
IEC 60065 – 93 +2%/-3% (t 30°C +0/-2°C)
* Z9 n3 ~& j5 A" Z5 R4 VIEC 60950-1 – 91% - 95% (t 20-30°C +/-1°C)
& u% s; {5 o0 q5 |. a9 e! t) P7 f0 _IEC 60601-1 – 93 + 3%/-3% (t 20-30°C)
IEC 61010-1 – 92,5 + 2,5%/-2,5% (t 40°C +/- 2°C)
% X6 Q* V0 ^% mIEC 60335-1 – 93 + 3%/- 3% (t 20-30°C +/-1°C)
* t2 P' e) [, y9 T, CThere does not seem to be a technical justification for the differences in the specifications.
Accordingly, it is suggested and recommended that the humidity/temperature specifications in the above standards be consistent.
Decision: The chamber is to be set at 93% RH, with +/-3% RH tolerance, at a convenient temperature between 20°C and 30°C, but the chosen temperature to be kept within +/- 2°C during the test.
. M! r( g( E* }2 ^) hThe standard specifications for the humidity are to be met at the reference/measuring point, where the controlling humidity sensor is located.
The tolerances permitted in CTL DSH 251A (+/-6% RH) are allowed in other parts of the humidity chamber, away from the reference point.

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