Model 4040DDS– Operating Manual
6
Section 1
Introduction
1.1 Introduction
This manual contains information required to operate the MODEL 4040DDS – 20MHz DDS Function Generator.
This section covers the instrument general description, instrument specifications and characteristics. Please note
that the RS-232 connector on the back of the unit is not to be used as a programming or user interface. It is for
factory use only.
1.2 Description
The MODEL 4040DDS is a versatile high performance function generator that produces Sine, Square and Triangle
signals. Waveforms can be output in continuous, triggered or gated mode. AM and FM modulation combined
with versatile Sweep capabilities make the unit suitable for a wide range of applications.
1.3 MODEL 4040DDS - SPECIFICATIONS
FREQUENCY CHARACTERISTICS (STANDARD WAVEFORMS)
Sine - 0.1 Hz to 20 MHz
Square - 0.1 Hz to 20 MHz
Triangle , Ramp - 0.1 Hz to 2 MHz
Accuracy - 0.01 % (100 ppm)
Resolution - 4 digits or 10 mHz
OUTPUT CHARACTERISTICS
Amplitude Range - 10mV to 10Vp-p into 50 ohms
Resolution - 3 digits (1000 counts)
Amplitude Accuracy - ± 2% ± 20mV of the programmed output from 1.01V- 10V
Flatness - 0.5 dB at 1MHz
- 1 dB to 20 MHz
Offset Range - ± 4.5V into 50 ohms, depending on the Amplitude setting
Offset Resolution - 10 mV with 3 digits resolution
Offset Accuracy - ± 2% ± 10mV into 50 ohms
Output Impedance - 50 ohms
Output Protection - The instrument output is protected against short circuit or accidental
voltage practically available in electronic laboratories, applied to the
main output connector
WAVEFORM CHARACTERISTICS
Harmonic Distortion - 0-20 KHz -50 dBc
- 20 KHz-100 KHz -45 dBc
- 100 KHz-1 MHz -40 dBc
- 1 MHz-20 MHz -30 dBc
Spurious - DC-1MHz <-55 dBc
Square Rise/Fall Time - < 20 ns (10% to 90%) at full amplitude into 50 ohms
Variable Duty Cycle - 20% to 80% to 2 MHz for Square and 10%-90% for Triangle
Symmetry at 50% - < 1 %
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