Manual

Issue 2, January 2020 Model 47A User Guide
Page 26 Studio Technologies, Inc.
operation DIP switch 4 should remain in
its off (down) position. When DIP switch
4 is in its on (up) position factory mode is
active (enabled). Enabling this mode will
result in the following operating condition:
during an auto null sequence the associ-
ated 4-wire output channel will remain
active. This will allow the tones associated
with the nulling process to be present on
the 4-wire output. While not appropriate
during actual Model 47A use, it is inter-
esting to “hear” the nulling process take
place. But unless directed by factory per-
sonnel DIP switch 4 should remain in its
off (down) position.
Technical Notes
Software Version Display
A special Model 47A power-up sequence
allows the unit’s software version number to
be displayed. This is useful when working
with factory personnel on application sup-
port and troubleshooting situations. The five
meter LEDs associated with FROM 4-wire
channel 1 of interface 1 are used to display
the major release number with a range of 1
through 5. The five meter LEDs associated
with TO 4-wire channel 1 of interface 1 are
used to display the release sub-number
which again ranges from 1 through 5. Refer
to Figure 12 for a detailed view of the meter
LEDs and the corresponding software ver-
sion numbering scheme.
Figure 12. Detail of front panel showing the status LEDs that display the software version. In this
example, the software version is 1.3.
Major Release Number Release Sub-Number
O 4 .4 O
O 3 .3 
O 2 .2 O
 1 .1 O