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Section 1
Introduction
1.1 Introduction
This manual contains information required to operate, program and test the Model 4076 and 4079 – 50 MHz DDS
Arbitrary Function Generators. This section covers the instrument general description, instrument specifications and
characteristics.
1.2 Description
The Model 4076 and 4079 are versatile high performance arbitrary waveform generators. Arbitrary waveforms can be
programmed and generated with 14 bit resolution and up to 4,000,000 points length. Waveforms can be output in
continuous, triggered, gated or burst mode. AM and FM modulation combined with versatile Sweep capabilities make
the unit suitable for a wide range of applications. Editing is flexible and easy including auto increment, line draw and
predefined waveform facilities. The instrument can be remotely operated via the RS232 or GPIB interface and they are
SCPI compatible.
1.3 Memory Architecture
The waveform memory consists of 4,000,000 points. The user can edit arbitrary waveforms in waveform memory and
can specify any data value in the range from -8191 to 8191 for any point in waveform memory (14 bit depth). Due to
their large memory bank, the 4076 and 4079 can essentially give the user greater freedom in selecting the size of their
waveforms and the number of waves they desire to generate, with the limit of 4,000,000 total points when added
together.
For example, these generators can create a waveform with 100,000 points, another waveform with 500,000 points, a
third waveform with 400,000 points, and a fourth waveform with 3,000,000 points. These four waveforms total up to
4,000,000 points, but essentially they can be referenced in the memory bank according to their starting point and their
length. There are no restrictions as to how many different waveforms you can store in the memory, so as long as the
sum of the points of all the waveforms do not exceed 4,000,000 points. To better illustrate this, refer to drawing
below:
The following operations can be performed in the waveform memory:
- Insert and scale any of the following predefined waveforms:
1
4,000,000
Waveform 1
Waveform …
Waveform 2
Waveform 3
A pts.
B pts.
C pts.
D pts.
A pts. + B pts. + C pts. + D pts.
≤
4,000,000 pts.
Point
Point
