Markers; Introduction; Sample Markers - Keysight M8121A User Manual

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Markers

Introduction

Sample Markers

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The instrument provides output signals with a defined timing relationship
to the output sample stream. These signals are called markers.
There are two different types of markers:
• Sample Markers
• Vector Markers
The details of these markers are explained in the sections that follow.
Sample markers can be used to mark individual samples.
The following table shows the marker granularity:
Table 3 Marker granularity
Mode
High Speed (Option -12G)
High Precision (Option -14B)
INT_x3 (Option -DUC)
INT_x12 (Option -DUC)
INT_x24 (Option -DUC)
INT_x48 (Option -DUC)
The marker width of one marked sample is fixed to the marker granularity.
Multiple consecutive marked samples generate one output marker, which
is expanded to cover all marked bits. The length of this marker is quantized
to the marker granularity.
The sample marker is always aligned to the sample data. This alignment
varies depending on the mode. Delay adjustments also change the delay
of the sample marker.
The following drawing shows an example. The dots represent the marked
samples.
Granularity in DAC Samples
48
40
24
24
24
48
Keysight M8121A Arbitrary Waveform Generator User Guide