Admesy hera Operating Manual
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177 Autoranging7.1 IntroductionThe Hera includes an auto range function for the spectrometer sensor.This function is useful in case the measured object shows an unknownluminance value. In this case, the Hera will try to find the optimum settingwhich is a trade-off between speed and the stability of the instrument. Theautoranging function can also be fine-tuned to reach better stability levelsby setting a few parameters. Autoranging can be controlled by 3parameters. Frequency : supposed to be frame frequency of the source(display) that is measured Adjmin : The minimum level to adjust toAdjmin can vary between 1 and 100. Reasonable results will be achievedwhen set to 40 for the spectrometer regarding the speed and the stability.If high stability is needed, this setting must be increased (butmeasurements will become slower). If a faster measurement is neededand the stability level may be lowered a little, the value of adjmin can bedecreased. When the Hera measures in auto range mode, it can happenthat the found integration time is very low. For example when measuringwhite it may be just 7ms. When this happens, the Hera will automaticallyincrease the averaging so that the total measurement time equals >=(1/frequency) · averaging.7.2 How autoranging worksThe auto ranging works, by first setting a default integration time. If thisalready meets the criteria for a good measurement, the measurement willbe done using that integration time. It should be clear that this is thefastest because no adjustment will be done. In case the measured result iseither to low or too high (clip), than the Hera will adjust to a better level.The following graph shows how levels inside the Hera work.Fig 5 Autorange levelsWhen auto-ranging is set, the Hera will accept any level between “Adjmin”and “Adjmax” as a good signal. The Adjmin level can be set by the userthrough a software command, allowing some fine tuning of the stability andthe speed of the instrument.adjmin leveladjmax levelclipping |
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