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14 Using the CTU with a TB7100 TBA0STU/TBA0STP CTU Operation Manual

IOIOI

Not used with TB7100.

POWER The POWER LED is lit when the CTU is powered up. The TB7100

system interface provides power to the CTU over the 25-way system

interface connector

1! (see also Figure 3.2 on page 16). This supply powers

the noise source, speaker, LEDs, and RS-232 communications.

Connecting power directly to the DC input connector

2@ on the CTU is

unnecessary, but will not damage the CTU.

Note You do not need to provide power to the CTU at all in order to

make audio level measurements or to use the digital inputs and

outputs. Lack of power will not affect these interfaces.

NOISE Not used with TB7100.

LINE INPUT The CTU makes audio at this input available to the TB7100 transmitter (it

connects LINE INPUT to the balanced line input on the system interface

connectors).

UNBALANCED/OFF/

BALANCED

This switch directs either the balanced or unbalanced receiver output audio

to the CTU speaker. When set to “OFF”, no audio is present on the

speaker.

UB INPUT This input is connected to the unbalanced line input on the system interface

connectors.

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 TB7100 receiver available on this

connector (it connects LINE OUTPUT to the balanced line output on the

system interface connector). LINE OUTPUT is connected directly to pins

1 & 2 on the connector (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 TB7100.

SYSTEM INTERFACE The 25-way connector is used with the TB7100 CTU adaptor board to

connect to the 25-way connector on the rear of the TB7100.

Tait TB9100 Operation Manual

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