GE IS200ESELH1A Relay input module

If there is a zero offset in the reference value, you cannot subtract this using the dB offset function. Instead, before the start of the measurement, press “offset” and subtract the zero offset. Then follow steps 1 and 2 above. The zero offset subtracted when “offset” was pressed will be saved in the dBm scale and you can now use the dB-O setting to measure true ratio without zero offset problems.

Average and Measuring Very Low Power Measurement 

If the laser power is fluctuating, the Nova II can display the average power readings with averaging periods varying from 1s to 1 hour. When measuring very low powers, such as picowatt measurements using the PD300-IRG or PD300-UV, there will be a rather large zero offset coming from the detector as well as a considerable noise fluctuation. Nevertheless, you can measure these low values by using the average function and pressing offset to eliminate the detector zero offset.

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The model meets your needs.

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