Ocean Optics DTS - Manual (Page 45)

Collecting Spectra and Manipulating Data
Polychromix DTS TM Near-Infrared Spectrometer 5-9
Operator’s Manual
Document Number 04-91-0201-00 Rev A
5.5 The Light Meter
The Light Meter option is provided to allow the user to monitor a source.
When this function is selected, the spectrometer will present a time-based
record of the intensity summed over all wavelengths (all MEMS pixels set to
maximum throughput). A typical output is shown in Figure 5-10. The value in
the lower right corner of the status line is the instantaneous value of the
current (not the position of the cursor).
Figure 5-10: Typical Light Meter Output
During light meter data collection, the left mouse button will freeze the plot
but data will continue to be collected. To update the plot, press the right
mouse button.
The light meter is often used to optimize the signal level. Ideally, the signal
from the source should be adjusted, when possible, to just below saturation
of the detector, which occurs at 1,500 nA.