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Issue Preliminary 2, March 2009 Model 45 User Guide
Page 26 Studio Technologies, Inc.
unit. Power can be provided by the con-
nected intercom circuits or by way of an
external source of 24 volts DC. The final
step to achieve correct performance is for
the auto null function on each Model 45 to
be activated. Refer to Figure 9 for details.
Figure 9. Two Model 45 units connected as a universal 2-wire-to-2-wire bridge