Aeroflex 2946A Instructions d'exploitation télécharger pdf (Page 102)

OPERATING MANUAL 2945A

46882-311D 3-63

Parameter Test mode

Tx frequency Tx test mode

AF generator 1 frequency Tx test mode

AF generator 2 frequency Tx test mode

AF generator 1 level Tx test mode

AF generator 2 level Tx test mode

RF generator frequency † Rx test mode

RF generator level Rx test mode

Modulation generator 1 frequency Rx test mode

Modulation generator 2 frequency Rx test mode

Modulation generator 1 level Rx test mode

Modulation generator 2 level Rx test mode

AF generator 1 frequency AF test mode

AF generator 2 frequency AF test mode

AF generator 1 level AF test mode

AF generator 2 level AF test mode

RF centre frequency Spec ana.

RF frequency span ‡ Spec ana.

RF level ‡ ‡ Spec ana.

† The RF generator can be made to step up or down through each channel of a mobile radio system

type, by setting the

∆

frequency to the channel spacing frequency.

‡ The SPEC ANA mode SPAN adjustment using the

FREQ

[ ] and [ ] keys, sets the span to

predetermined values. These are not adjustable by the user. See Setting up; SPAN on page 3-53.

‡ ‡ The SPEC ANA mode RF LEVEL adjustment using the

LEVEL [ ] and [ ] keys, changes the

RF reference level in steps of 1 display division . This can be either 2 dB/div or 10 dB/div, dependent on

the value of dB/div set in the SPEC ANA mode.

Assigning

The assignment of the incremental keys is shown in the display, along with the step value.

To assign a parameter to a pair of keys, first select the parameter as if to change the value using

the data input keys, but rather than entering a new value press the orange [ALT ∆] key. Now

enter the value of the step to be incremented at each keypress, followed by the correct terminator

key.

For example to assign the FREQ [

] and [ ] keys to AF generator 1 in the Tx TEST mode and

to step up or down by 500 Hz steps, follow this procedure:-

From the Tx TEST display press the [Audio Gen] key.

Use the [Gen 1/Gen 2] key to select

Press the orange [LEVEL] key.

The

legend following will be highlighted.

Press the orange [∆ INC] key, followed by [5] [0] [0] and the [Hz] terminator key.

The display will show the legend

Increments

AF1 FREQ: 500 Hz

Now each press of a FREQ [ ] or [ ] key will increase or decrease the output frequency of AF

generator 1 by 500 Hz.

Points to note are:-

Each press of a FREQ [

] or [ ] key will be effective from the current point. Thus if the

frequency of the generator in the above example has been incremented to

1,500 Hz and then

1 2 ... 97 98 99 100 101 102 103 104 105 106 107 ... 236 237

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Aeroflex 2946A Instructions d'exploitation Page 102

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