moisture balance - meaning and definition. What is moisture balance
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  3. moisture balance

What (who) is moisture balance - definition

Moisture sensitivity; Moisture Sensitivity Level

Color balance         
  • South Arm]], [[Tasmania]], Australia. The white balance has been adjusted towards the warm side for creative effect.
  • Photograph of a [[ColorChecker]] as a reference shot for color balance adjustments.
  • Example of color balancing
  • Two photos of a high-rise building shot within a minute of each other with an entry-level point-and-shoot camera. Left photo shows a "normal", more accurate color balance, while the right side shows a "vivid" color balance, in-camera effects and no post-production besides black background.
  • A white-balanced image of Mount Sharp (Aeolis Mons) on Mars
  • Mount Sharp (Aeolis Mons)]] on [[Mars]]
ADJUSTMENT OF THE INTENSITIES OF THE COLORS
White balance; Colour balance; White Balance; White balancing; Gray balance; Whitebalance; Auto white balance; Auto White Balance; Automatic White Balance
In photography and image processing, color balance is the global adjustment of the intensities of the colors (typically red, green, and blue primary colors). An important goal of this adjustment is to render specific colors – particularly neutral colors like white or grey – correctly.
https://en.wikipedia.org/wiki/Color_balance
Balance bicycle         
  • 1820}})
  • Toddler on metal balance bike
TRAINING BICYCLE FOR CHILDREN
Balance bike; Run bike; Wooden balance bike
A balance bicycle, run bike or no pedal bike or dandy horse is a training bicycle that helps children learn balance and steering. It has no foot pedals, no drivetrain, no chain, no gears, no gear shifters, no derailleurs, and no freewheel.
https://en.wikipedia.org/wiki/Balance_bicycle
Balance wheel         
  • Balance wheel in a 1950s alarm clock, the Apollo, by Lux Mfg. Co. showing the balance spring (1) and regulator (2)
  • Early balance wheel with spring in an 18th-century French watch
  • ETA]] 1280 movement from a Benrus Co. watch made in the 1950s
  • Modern balance wheel in a watch movement
  • Marine chronometer balance wheels from the mid-1800s, with various 'auxiliary compensation' systems to reduce middle temperature error
  • Perhaps the earliest existing drawing of a balance wheel, in [[Giovanni de Dondi]]'s [[astronomical clock]], built 1364, Padua, Italy. The balance wheel (crown shape, top) had a beat of 2 seconds. Tracing of an [https://books.google.com/books?id=o8Nb5KLBxVQC&dq=balance+wheel&pg=PA106 illustration] from his 1364 clock treatise, ''Il Tractatus Astrarii''.
  • Bimetallic temperature-compensated balance wheel, from an early 1900s pocket watch. 17 mm dia. (1) Moving opposing pairs of weights closer to the ends of the arms increases temperature compensation. (2) Unscrewing pairs of weights near the spokes slows the oscillation rate. Adjusting a single weight changes the poise, or balance.
  • Foliot ''(horizontal bar with weights)'' from De Vick clock, built 1379, Paris
MECHANISM IN CLOCKS
Compensation balance; Auxiliary temperature compensation; Compensation-Balance
·- A wheel which imparts regularity to the movements of any engine or machine; a fly wheel.
II. Balance wheel ·- A wheel which regulates the beats or pulses of a watch or chronometer, answering to the pendulum of a clock;
- often called simply a balance.
III. Balance wheel ·- A ratchet-shaped scape wheel, which in some watches is acted upon by the axis of the balance wheel proper (in those watches called a balance).

Wikipedia

Moisture sensitivity level

Moisture sensitivity level (MSL) is a rating that shows a device's susceptibility to damage due to absorbed moisture when subjected to reflow soldering as defined in J-STD-020. It relates to the packaging and handling precautions for some semiconductors. The MSL is an electronic standard for the time period in which a moisture sensitive device can be exposed to ambient room conditions (30 °C/85%RH at Level 1; 30 °C/60%RH at all other levels).

Increasingly, semiconductors have been manufactured in smaller sizes. Components such as thin fine-pitch devices and ball grid arrays could be damaged during SMT reflow when moisture trapped inside the component expands.

The expansion of trapped moisture can result in internal separation (delamination) of the plastic from the die or lead-frame, wire bond damage, die damage, and internal cracks. Most of this damage is not visible on the component surface. In extreme cases, cracks will extend to the component surface. In the most severe cases, the component will bulge and pop. This is known as the "popcorn" effect. This occurs when part temperature rises rapidly to a high maximum during the soldering (assembly) process. This does not occur when part temperature rises slowly and to a low maximum during a baking (preheating) process.

Moisture sensitive devices are packaged in a moisture barrier antistatic bag with a desiccant and a moisture indicator card which is sealed.

Moisture sensitivity levels are specified in technical standard IPC/JEDEC Moisture/reflow Sensitivity Classification for Nonhermetic Surface-Mount Devices. The times indicate how long components can be outside of dry storage before they have to be baked to remove any absorbed moisture.

  • MSL 6 – Mandatory bake before use
  • MSL 5A – 24 hours
  • MSL 5 – 48 hours
  • MSL 4 – 72 hours
  • MSL 3 – 168 hours
  • MSL 2A – 4 weeks
  • MSL 2 – 1 year
  • MSL 1 – Unlimited floor life
https://en.wikipedia.org/wiki/Moisture sensitivity level
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