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March 2013

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Subject:
From:
Steven Creswick <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Steven Creswick <[log in to unmask]>
Date:
Fri, 8 Mar 2013 11:35:05 -0500
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Bob,

I have always considered them to be absolute.  If relative - relative to
what?

Do the cardboard indicators provide a temp range for which they are valid?

Steve C

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner
Sent: Friday, March 08, 2013 11:24 AM
To: [log in to unmask]
Subject: [TN] Humidity Measurements: Relative or Absolute

Hi,

 

As I start looking at humidity measurement devices I started to wonder if
IPC humidity numbers are Relative or Absolute? Does anyone know off hand. I
need to go buy some specs.

 

I would have thought Absolute but the cardboard indicators are temperature
sensitive as are the desiccant drying systems in dry cabinets. 

 

If the temperature is high, say > 100C then a part will "Bake Out"
regardless of the absolut humidity, is that right?

 

Bob K.  



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