DSH 624/07 Humidity test requirements
http://decisions.iecee.org/icons/ecblank.gifDSH 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
Standard(s): IEC 60065/2001
A1/2005
IEC 60950-1/2005
IEC 60601-1/2005
IEC 61010-1/2001
IEC 60335-1/2001
A1/2004
A2/2006
Sub clause(s): Various
Sheet N°: 624/07
CTL-WG4
Page: 1(1)
Subject(s): Humidity test
requirements
Key words:
- 93% RH
- +/-3% RH tolerance
- 20 – 30°C
Meeting:
Decision confirmed
at 45th CTL meeting
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)
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.
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.
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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