DSH 624/07 Humidity test requirements

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DSH 624/07 3 }( L. z' V4 O- Z- l9 l% _6 b

Humidity test requirements

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60335-1(ed.4);am1;am2 & 61010-1(ed.2) & 60601-1(ed.3) & 60950-1(ed.2) & 60065(ed.7);am1

1 d& o) _8 o7 V2 i5 \+ }Question: Various IEC standards have requirements for humidity/temperature conditioning, but have different specifications for the test conditions.
- K5 j$ Q; I' h/ i2 H8 Z3 UIEC 60065 – 93 +2%/-3% (t 30°C +0/-2°C)
IEC 60950-1 – 91% - 95% (t 20-30°C +/-1°C)
IEC 60601-1 – 93 + 3%/-3% (t 20-30°C)
IEC 61010-1 – 92,5 + 2,5%/-2,5% (t 40°C +/- 2°C)
IEC 60335-1 – 93 + 3%/- 3% (t 20-30°C +/-1°C)
There does not seem to be a technical justification for the differences in the specifications.
3 Z0 @" h/ t% f, @; TAccordingly, it is suggested and recommended that the humidity/temperature specifications in the above standards be consistent.
% j+ g/ J, K# d) T9 i7 }8 [0 _9 ]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.
The 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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