Aeroflex 2948B Betriebsanleitung PDF herunterladen (Seite 80)

LOCAL OPERATION

3-26

Audio generator setup

Freq. range 10 Hz to 20 kHz

Level range 0.1 mV to 4 V RMS

Shape option Sine or square

To set up the audio generators in order to modulate the transmitter, press the [Audio Gen] key.

This will display the audio setup menu shown in fold out diagram (2-4).

Set up the audio generator(s) for the required frequency and output level by using the soft keys

and data input keys:-

[Gen 1/Gen 2] to select AF1, then, [FREQ][n]....[n][kHz/Hz]

[LEVEL][n]...[n][V/mV/dBm]

then [Gen 1/Gen 2] to select AF2 if required, ....[.../dBm]

The FREQ [×] and [Ø] and the LEVEL [×] and [Ø] keys can be assigned to AF generator

frequency and level. See Incremental adjustments which starts on page 3-68.

Either or both generators can be switched off to suit the test requirement. To disable a generator

select it using the [Gen 1/Gen 2] key to toggle between them. When the title of the generator is

highlighted on the display, press the orange[ON/OFF] function key. Repeated presses of this key

will toggle the ON/OFF action.

The shape of each audio generator output waveform can be either sine or square wave. This is

controlled by first selecting the audio generator as for [ON/OFF] control above, then pressing the

[Shape] key to toggle between the options.

Note that the audio generators are also used as modulation generators for the

receiver test signal generator. If both generators are set up as a modulation

source in the Tx test mode, switching to Rx TEST mode will show both

modulation generators in the OFF condition. Either or both generators can be

set up and turned on within the Rx TEST mode.

The frequency, level and shape settings of their last use in the Rx TEST mode will be retained

within the Rx TEST mode setup. These settings will be effective when the generators are

switched to the ‘ON’ condition in receiver test mode. Their use as audio generators in the Tx

TEST mode will then be disabled.

Pressing the [Lock] key locks the output level of the two audio generators to the same level. The

unselected generator locks to the level of the selected generator.

When the audio generators are set to the required settings press the [Return] key to restore the Tx

TEST menu.

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Aeroflex 2948B Betriebsanleitung Seite 80