DSH 624/07 Humidity test requirements

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DSH 624/07

Humidity test requirements # O* G6 X4 e. U# ~% j# B; _4 ~. o

Various 8 V. l" F# A' V

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

! {2 f7 y2 G' ?+ l. h- m1 F& qQuestion: 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)
8 t3 D9 a; a2 A" NIEC 60950-1 – 91% - 95% (t 20-30°C +/-1°C)
IEC 60601-1 – 93 + 3%/-3% (t 20-30°C)
3 @* I" T! W+ K( F" R! L7 ], \IEC 61010-1 – 92,5 + 2,5%/-2,5% (t 40°C +/- 2°C)
/ L$ z1 M/ N% ~& s: T! ?IEC 60335-1 – 93 + 3%/- 3% (t 20-30°C +/-1°C)
4 T; w. ~+ T" \8 {+ w% [; Q1 tThere does not seem to be a technical justification for the differences in the specifications.
  U/ {  m  z6 f2 V  |* }' p7 EAccordingly, 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.
7 v) B& h! F5 R0 u5 t0 W; Q5 BThe 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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