GW Instek SFG-2000 Series - Manual (Page 5)

GETTING STARTED
9
G
ETTING STARTED
This chapter describes SFG-2000 series in a nutshell,
including main features and front/rear/display
introduction. Follow the Set Up section to properly
install and power up SFG-2000 series.
SFG-2000 series
overview Technical background ............................................ 10
Series lineup .......................................................... 12
Main features......................................................... 12
Panel
introduction Front Panel ............................................................ 13
Rear Panel.............................................................. 19
Setup Tilt stand ............................................................... 20
Power up................................................................ 21
Recall the default setting ....................................... 21
Functionality check ................................................ 21
Quick reference Operation Shortcuts .............................................. 22
Default Setting Contents........................................ 24
SFG-2000 Series User Manual
10
Technical background
Traditional
function
generators SFG-2000 series uses the latest Direct Digital Synthesis
(DDS) technology to generate stable, high resolution
output frequency. The DDS technology solves several
problems encountered in traditional function generators,
as follows.
Constant current circuit methodology
This analog function generating method uses a constant
current source circuit built with discrete components
such as capacitors and resistors. Temperature change
inside the generator greatly affects the components
characteristics which lead to output frequency change.
The results are poor accuracy and stability.
DDS
methodology In DDS, the waveform data is contained in and
generated from a memory. A clock controls the counter
which points to the data address. The memory output is
converted into analog signal by a digital to analog
converter (DAC) followed by a low pass filter. The
resolution is expressed as fs/2k where fs is the frequency
and k is the control word, which contains more than
28bits. Because the frequency generation is referred to
clock signal, this achieves much higher frequency stability
and resolution than the traditional function generators.