3: GSN 200
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Geodesic Sensor Net Technical Manual
S-MAN-200-GSNR-001 • January 31, 2007
Sizing
The GSN 200 is available in 14 sizes based on head circumference. Instructions for
choosing a suitably sized Net are covered in Chapter 6, "Applying the GSN.” A sizing
chart is located in Appendix B, "Net Sizing and Sensor Layouts.”
Infant Nets
Infant GSN 200s do not contain built-in inferior
orbital sensors but are made so that you can
use optional, separate outrider orbital sensors (Figure
3-8). The orbital sensors plug into the special GSN
Hypertronics plug that is part of every infant GSN.
If used, orbital sensors are attached to the face of the infant by means of medical tape
or a gel such as Elefix, which is supplied by EGI.
The Hypertronics connector for an infant GSN has jacks for connecting outrider
sensors. Table 3-1 lists the number of jacks for each infant GSN 200 model and the
channels to which they map.
When you use an infant GSN 200, short to isolated common any jack on the connector
that does not have an outrider sensor plugged into it. Figure 3-9 shows both sides of
the special connector for the 64-channel infant GSN 200, with a shorting strap
connecting the channel 63 and channel 64 outrider jacks to the isolated common jack.
Table 3-1. Infant GSN 200outrider sensors
GSN model Number of jacks Map to channels . . .
64 channel infant GSN 200 2 63 and 64
128 channel infant GSN 200 4 125, 126, 127, and 128
Figure 3-8. Outrider sensor
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