Test and Trim

Discussion in 'General Electronics Chat' started by Zsonali, Apr 4, 2014.

  1. Zsonali

    Thread Starter New Member

    Apr 3, 2014
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    Hi all,
    I want to know what is meant by testing and trimming? When it is done? What is the significance of this?
     
  2. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,386
    1,605
    It is the tweak step, the step where you twist a knob or change resistors or do something to set something.

    It is done after assembly when the unit is functional.

    An example would be a fixed voltage power supply where the output voltage is adjusted to a very tight tolerance by adjusting an internal potentiometer.

    In the hybrid world this was quite common. Hybrids don't use PCB they use a ceramic base with resistors and connections printed right onto the ceramic base. Resistors are "trimmed" by cutting material away with a laser to increase the value. This can be done at a test step to get very accurate settings.
     
  3. Zsonali

    Thread Starter New Member

    Apr 3, 2014
    18
    0
    During chip design why testing and trimming is required?
     
  4. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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