TBA0STU/TBA0STP CTU Operation Manual Using the CTU with a TB8100 23
© Tait Electronics Limited September 2005
UB INPUT
This input is connected to the unbalanced line input on the system interface
connectors.
Note In August 2005, the unbalanced input on the CTU was changed
from DC to AC coupled. Refer to “AC Coupled Unbalanced
Audio Input” on page 9 for more details.
UB OUTPUT This output is connected to the unbalanced line output on the system
interface connectors. Audio on this line can be monitored on the CTU
speaker.
LINE OUTPUT The CTU makes audio from the TB8100 receiver available on this
connector (it connects LINE OUTPUT to the balanced line output on the
system interface connectors). LINE OUTPUT is connected directly to pins
1 & 2 on the connectors (i.e. it is not grounded). The audio on LINE
OUTPUT can be monitored on the CTU speaker.
600Ω LOAD This switch connects or disconnects the 600Ω load across the balanced
LINE OUTPUT. This allows the output to be terminated correctly for
calibration procedures. Turn the switch on if the LINE OUTPUT is not
otherwise terminated.
SYSTEM INTERFACE Not used with TB8100.
SYSTEM INTERFACE These connect to the 25-way or 15-way system interface connector on the
rear of the reciter.
DIGITAL/
PROGRAMMING
INPUTS
These switches let you set the digital inputs into the TB8100 high or low.
The switches are connected to the digital inputs on the system interface
connectors, as described in the table below. The standard switch settings are
as follows:
1 = high, inactive, 5V (10kΩ pull-up to 5V)
0 = low, active, 0V
The CTU is a generic test unit, so not all digital I/O lines can be exercised
or monitored. This applies in particular to the ability to monitor
bidirectional I/O lines, as these are connected only to switches, not LEDs
(see also DIGITAL OUTPUTS
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