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1.3 Front Panel

The TR122 front panel provides three standard BNC connections to the instrument

electronics. These are labeled for the two channels and the external trigger. There is also a serial

number label on the card ejector lever. This number will be presented by the TR122 software to

indicate which TR122 is being used, which may be important when there are multiple such

instruments in the system.

While the instrument has some immunity from typical connection mistakes, care should

be still used when connecting external devices. Always observe the maximum ratings indicated

in the specifications. Also note that some of these ratings indicate particular settings. For

example, the 50 ohm termination is only capable of handling 4 watts, thereby limiting the

peak voltage that can be handled with this setting.

The external trigger input is limited to +/-10V peak. While slightly higher voltages will

not damage the unit, they will operate a protection mechanism. It is recommended that care be

taken to keep this input within its specified range. This input is typically used to provide an

effective third input which may carry only binary trigger information or to provide some ability

to synchronize multiple instruments.

DDC TR122 User Manual

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