Agilent Technologies ESG Betriebsanweisung PDF herunterladen (Seite 106)

90 Chapter 3

Basic Digital Operation

Using Waveform Markers

The ESG provides you with four waveform markers. Waveform markers are used by the ARB

modulation formats (W-CDMA, CDMA2000, AWGN, etc.) and the dual ARB player to mark

specific points on a played waveform. When markers are encountered by the ESG, auxiliary

output signals are generated and routed to the rear panel event connector (EVENT 1, 2, 3, or

4) that corresponds to the marker number. The markers can also be configured to initiate one

or all three of the following functions: RF blanking, ALC hold, trigger alternate amplitude.

ALC hold is automatically activated when RF blanking occurs. So there is no need to select

marker ALC hold for the same marker number that is utilizing RF blanking.

The auxiliary output signals can be constructed as clock signals for synchronizing other

instruments with the played waveform, or used as a trigger signal for starting measurements

at a given point on the waveform.

When a waveform file is generated, a marker file is created that places a marker on the first

sample point of the waveform for markers one and two. However when a waveform file is

downloaded that does not have a waveform file associated with it, the ESG creates a marker

file, but does not place a marker on the first point.

Within the ARB modulation formats, marker points can be modified only while the waveform

is playing. However in the dual ARB player, the waveform does not have to be playing in order

to modify the marker points. You can also edit the marker points for the

AUTOGEN_WAVEFORM file from the dual ARB player while the waveform is playing within

a modulation format.

When working with waveform files in the dual ARB player, the files, called waveform

segments, must reside in volatile memory. For loading waveform segments into volatile

memory, see “Loading Waveform Segments from Non-Volatile Memory” on page 83.

In the following procedures you will be shown how to use markers while working in the dual

ARB player, but the process is the same for all the ARB modulation formats. The terms

marker points and sample points are used interchangeably.

Accessing the Marker Utilities

This procedure shows you the location of the marker parameters. Unless stated differently by

having you press the

Mode hardkey, the procedures following this one will start after entering

the

Marker Utilities softkey menu.

1. Press

Mode > Dual ARB.

2. Press the

Select Waveform softkey, highlight a waveform for play-back, and press Select

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Agilent Technologies ESG Betriebsanweisung Seite 106