GE IS200ERRRH1A Input logic module
the Nova II display reads 0.1mW when the laser is blocked and 20.5 mW with laser power applied. In this case, the true power is 20.5 - 0.1 = 20.4 mW. To subtract the background, press "offset" while the laser is blocked. The Nova II will now read zero (0.0), and the 0.1 mW background will be subtracted from all subsequent readings. The laser power reading will thus be 20.4 mW.
When "offset" is engaged, the legend is highlighted.
To cancel, press "offset" again. If the "offset" is engaged, and you wish to subtract a new value of the background, press "offset" twice. The first press will cancel the old value, and the second will activate a new value. If you suspect that the Nova II has a permanent zero offset, then disconnect the sensor while it is in the power measurement mode.
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