GE IS200BICLH1B Speed module
The Zoom function causes the scale to expand the present scale fivefold. Thus, if the full scale of the bargraph is 20 watts, and your reading is 15 watts, pressing “zoom” will make the bargraph scale range between approximately 13 and 17 watts. Variations in power are more easily seen in this mode To access the zoom function, simply press the “zoom” button. It will be highlighted to show that it is engaged. Note that the fiducial marks of the bargraph are further apart, indicating that zoom is engaged. Now press the “zoom” button again to return to the unexpanded bargraph display.
The offset function subtracts background from the signal.
If the ambient environment has a thermal background, so that the Nova II shows a nonzero power reading even when there is no laser, you can subtract the background using the zero function. For example, the Nova II meter reads 0.1 Watts when the laser is blocked, and 20.5 Watts with laser power applied. In this case, the true power is 20.5 - 0.1 = 20.4 Watts. To subtract the background, press the “offset” button while the laser is blocked. The Nova II will now read zero, and the 0.1 Watt background will be subtracted from all subsequent readings. The laser power reading will thus be 20.4 Watts.
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