Excel Example 1: Exponential Decay Time Constant Excel Parameter
This example calculates the time constant of an exponentially falling pulse, such as the light
output of a phosphor.
The first figure shows a typical pulse, including pseudo-random noise, generated by a VBScript:
The pulse was generated by a formula of the form e
(1 – t/TC1)
* e
-t/TC2
, where TC1 and TC2 are time
constants, The requirement is to measure the time constant TC2, using the portion of the trace
where TC1 has negligible effect. This was done using Function F1, which is not a part of the
measurement process.
238 SDA-OM-E Rev H
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