Section 1, Introduction, 1 introduction – B&K Precision 4078 - Manual User Manual
Page 7: 2 description, 3 memory architecture
Section 1
Introduction
1.1 Introduction
This manual contains information required to operate, program and test the Model 4075 and 4078 – 25 MHz DDS
Arbitrary Function Generators. This section covers the instrument general description, instrument specifications and
characteristics.
1.2 Description
The Model 4075 and 4078 are versatile high performance arbitrary waveform generators. Arbitrary waveforms can be
programmed and generated with 14 bit resolution and up to 400,000 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 an optional GPIB interface
(order models 4075GPIB or 4078GPIB) and they are SCPI compatible.
1.3 Memory Architecture
The waveform memory consists of 400,000 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 4075 and 4078 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 400,000 total points when added together.
For example, these generators can create a waveform with 10,000 points, another waveform with 50,000 points, a third
waveform with 40,000 points, and a fourth waveform with 300,000 points. These four waveforms total up to 400,000
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 400,000 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:
o
Sine
o
Triangle
o
Square
o
Ramp up
1
400,000
Waveform 1
Waveform …
Waveform 2
Waveform 3
A pts.
B pts.
C pts.
D pts.
A pts. + B pts. + C pts. + D pts.
≤ 400,000 pts.
Point
Point