Aeroflex 2946A Instructions d'exploitation télécharger pdf (Page 60)

OPERATING MANUAL 2945A

46882-311D 3-21

Directional Power

The [Dir Power] key displays the screen required for using the optional directional power and

VSWR accessories. The use of the Directional Power Head accessory is described in Appendix A

of this manual, and of the Light-weight Directional Power Head accessory, in Appendix B.

To leave this screen, press any of the blue MODE keys. The top level screen of that mode will be

displayed.

RF harmonic Analysis

The [Harmonc Analys] key activates the RF harmonic Analysis function. The right-hand side of

the screen shows five horizontal bar charts. The upper bar chart shows the power meter reading

and is the same as that shown on the other Tx TEST screens.

The four

HARMONICS bar charts display the level of the 2nd, 3rd, 4th and 5th harmonics of the

carrier. The frequency range of the instrument governs the number of harmonics of which

readings can be made.

The use of this facility is explained under Making measurements later in this chapter, starting on

page 3-25. Pressing the [Return] key will display the previously used Tx TEST screen with the

Tx power menu.

RF transient power Analysis

The [Trans Analys] key selects the RF Power

TRANSIENT ANALYSIS mode.

This mode displays a captured RF power profile of a transmitter against time. Triggering is

activated by the RF level passing a preset value. The signal is captured using a continually

updated, first in/first out, storage device. This allows the Service Monitor to show the power

profile both before and after the trigger point.

The use of this facility is explained under Making measurements later in this chapter, starting on

page 3-25.

Pressing the [Return] key will display the previously used Tx TEST screen with the top level

Tx TEST menu.

Modulation meter, demodulation options setup

Set up the demodulation options to be compatible with the transmission from the unit under test.

Press the [Mod Meter] key. The soft keys change to the demod soft keys shown in fold out

diagram (2-3).

Modulation Type

The Service Monitor can demodulate AM and FM signals. The demodulated signal is made

available at the ‘DEMOD OUT’ connector on the rear of the instrument. SSB signals can be

demodulated if the SSB option is fitted.

The [AM/FM] key, or [AM/FM/SSB] key, is used to select the appropriate modulation type by

sequential key presses. The

MOD LEVEL indication within the main display becomes suffixed by

% for AM; and by MHz or kHz for FM. When SSB has been selected, no modulation level is

shown, either digitally or as a bar chart.

Selecting the modulation type for Tx TEST does not change the current modulation type set on

the Service Monitor RF generator.

SSB Input sensitivity

No RF carrier signal is produced by SSB transmitters. Therefore the automatic gain control

circuits of the Service Monitor cannot respond to these signals.

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Aeroflex 2946A Instructions d'exploitation Page 60

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