Aeroflex 2946A Instructions d'exploitation télécharger pdf (Page 131)

LOCAL OPERATION

3-92 46882-311D

Setting up

Logic line state

The state of the logic lines outputs can be set from the logic lines setup menu, accessible by the

key sequence, [HELP/SETUP], [Setup], [Setup Page 2], [Logic Lines].

The top four soft keys on the right of the display control the normal state of the logic lines.

Pressing these keys will set the options alternately.

If the appropriate section of S1 is closed, the output can be set to either logic high or logic low. If

the appropriate section of S1 is open, the contacts between pin pairs can be set to opened or

closed. Switch S1 is mounted within the option assembly, on the printed circuit board. The

option assembly must be removed from the service monitor to have access to S1. Remove the

power connection from the service monitor, and any connections from the option assembly before

removing it from the service monitor. After making changes to S1, refit the option assembly to

the service monitor before re-connecting the power lead. Each of the four lines can be set

individually.

When any section of S1 is closed, and the connector output of that line (pins 2,3,4 or 5) is at a

logic state high, the associated pin (6,7,8 or 9) will also be at logic state high.

When any section of S1 is open, and the connector output of that line (pins 2,3,4 or 5) is at a logic

state low, the associated pin (6,7,8 or 9) will be open circuit.

Logic line control

Additional control is provided to logic lines 0 and 1, from the two top soft keys on the left of the

logic line setup menu.

When set to ‘As setting’, the output will be as set by the right-hand soft keys.

When the ‘Line 0 Mode’ is set to ‘Close for Transmit’, the state of this line will depend upon

which operating mode the instrument is set to.

When the instrument is in the Rx TEST mode, line 0 will take up the ‘Closed/Logic High’ state,

and the ‘Open/Logic Low’ state for all other test modes.

The ‘Press To Talk’ switch on the accessory microphone, if this accessory is fitted, will switch the

instrument from Rx TEST mode to Tx TEST mode. Therefore line 0 will also change state when

the ‘Press To Talk’ switch is operated.

When the ‘Line 1 Mode’ is set to ‘Close on Squelch’, line 1 will take up the ‘Closed/Logic High’

state when the instrument is in a squelched condition, and the ‘Open/Logic Low’ state when the

instrument is not squelched.

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Aeroflex 2946A Instructions d'exploitation Page 131