· 1 mHz to 200 kHz frequency range
· <−100 dBc distortion (to 20 kHz)
· Sine, square, white and pink noise
· 20
µµ
Vpp to 40 Vpp output range
· Linear and log frequency sweeps
· 25 ppm frequency accuracy
· SPDIF/EIAJ and AES-EBU outputs
· Balanced and unbalanced outputs
· RS-232 and GPIB interfaces
· DS360 ... $2595
(U.S. list)
Stanford Research Systems phone: (408)744-9040
www.thinkSRS.com
The performance of a low-distortion analog source and the
precision of direct digital synthesis (DDS) is combined in the
DS360. With less than 0.001 % total harmonic distortion (THD),
25 ppm frequency accuracy and a broad range of features
including standard waveforms, sweeps and bursts, the DS360
is the ideal source for audio frequency applications.
Ultra-Low Distortion and Noise
Unlike conventional RC oscillators, the DS360 uses digital
signal processing and a precision 20-bit D/A converter to
provide better than −100 dB distortion over the audio
frequency range. With its DDS architecture, the DS360 has
the features and flexibility of a contemporary synthesized
function generator. Every effort has been made to keep the
DS360 as quiet as possible. Careful shielding and board layout
keep the output noise to a minimum, making the DS360 the
instrument of choice for audio research and development,
manufacturing and automated testing.
Frequency Stability
Low-distortion analog sources have impressive THD
specifications, but poor frequency accuracy and resolution.
The DS360 delivers 0.0025 % frequency accuracy over its
entire frequency range. It has 6-digit frequency resolution
from 1 mHz to 200 kHz and a steady 25 ppm frequency
stability. You can actually dial in 123,456 Hz from the front
panel and have it mean something!
DS360 Function Generator
Synthesized Function Generators
DS360 Ultra-low distortion function generator
Waveforms
The DS360 generates clean sine and square waves as well as
a two-tone signal for IMD testing. The two-tone signal is
defined as either two sine waves or a sine and square wave.
Both frequency and amplitude are independently set for the
two waves allowing standard two-tone formats like SMPTE,
DIM and CCIF to be generated. In addition to standard
waveforms, the DS360 outputs white noise, pink noise and
band-limited white noise.
Audio Outputs
All functions and parameters are easily set using the frontpanel keypad and spin knob. Awide variety of amplitude units
including Vrms, Vpp, dBV, dBm and dBrel can be selected.
Front-panel outputs including XLR, BNC and dual banana
jacks assure compatibility with any system. The outputs can
be configured as balanced or unbalanced, with amplitudes
from 20.0 µVpp to 80.0 Vpp (balanced), and 10.0 µVpp to
40.0 Vpp (unbalanced). Chassis ground and output common
banana jacks are also provided. Rear-panel digital outputs
conform to AES-EBU and SPDIF/EIAJ formats. An XLR jack
is provided for the AES-EBU output, and both fiber optic and
coaxial connectors are provided for the SPDIF/EIAJ output.
Sweeps and Bursts
Unlike single frequency analog sources, the DS360 generates
low-distortion frequency sweeps over its entire frequency
range. Linear and log sweeps are set between 1 mHz and
200 kHz with sweep times between 0.3 ms and 100 s. Sweeps
can be single-shot or repetitive and the instrument can sweep
both up and down in frequency. The DS360 provides
outstanding amplitude flatness (0.5 % up to 20 kHz) during
frequency sweeps and has a TTL level sweep marker output
for synchronizing external equipment.
The DS360 also creates tone bursts of sine and square waves.
The number of ON cycles, repetition rate, and the OFF
amplitude level can all be adjusted. Sweeps and bursts may be
triggered from the internal rate generator or an external
trigger, or they can be externally gated.
Computer Control
The DS360 is designed for benchtop use as well as automated
testing. With standard IEEE-488.2 (GPIB) and RS-232
interfaces, the DS360 is fully programmablea feature seldom
found in low-distortion sources. All instrument functions can
be controlled or queried through the computer interfaces.
DS360 Low Distortion Function Generator
Stanford Research Systems phone: (408)744-9040
www.thinkSRS.com
DS360 rear panel
THD vs. Frequency (Hz)
Residual distortion for a 1 kHz, 28 Vrms (balanced) sine
wave after passing through a non-distorting notch filter
to attenuate the fundamental.
THD+N vs. Frequency (Hz)
-100.0
-105.0
-110.0
-115.0
-120.0
-125.0
-130.0
-135.0
-140.0
-145.0
-150.0
0.0 2.00k 4.00k 6.00k 8.00k 10.0k 12.0k 14.0k 16.0k 18.0k 20.0k
-60.00
-70.00
-80.00
-90.00
-100.00
-110.00
-120.00
20 100 1k 10k 20k
Waveforms
Sine
Frequency range 0.001 Hz to 200.000 kHz
THD (1 Vrms unbalanced, 2 Vrms balanced)
(<5 kHz) −110 dB (typ.), −106 dB (max.)
(5 to 20 kHz) −104 dB (typ.), −100 dB (max.)
(20 to 40 kHz) −100 dB (typ.), −96 dB (max.)
(40 to 100 kHz) −90 dB (typ.), −85 dB (max.)
(100 to 200 kHz) −76 dB (typ.), −68 dB (max.)
THD (10 Vrms unbalanced, 20 Vrms balanced)
(<5.0 kHz) −109 dB (typ.), −105 dB (max.)
(5 to 20 kHz) −103 dB (typ.), −99 dB (max.)
(20 to 40 kHz) −98 dB (typ.), −93 dB (max.)
(40 to 100 kHz) −88 dB (typ.), −83 dB (max.)
(100 to 200 kHz) −76 dB (typ.), −68 dB (max.)
Square
Frequency range 0.001 Hz to 200 kHz
Rise time 1.3 µs
Even harmonics < −60 dBc (to 20 kHz)
White Noise
Bandwidth DC to 200 kHz
Flatness <1.0 dB, 1 Hz to 100 kHz
Crest factor 11 dB
Pink Noise
Bandwidth 10 Hz to 200 kHz
Flatness <3.0 dB, 20 Hz to 20 kHz
(measured using 1/3 oct. analysis)
Crest factor 12 dB
Bandwidth Limited Noise
Bandwidth 100 Hz, 200 Hz, 400 Hz, 800 Hz,
1.6 kHz, 3.2 kHz, 6.4 kHz,
12.8 kHz, 25.6 kHz, 51.2 kHz,
102.4 kHz
Center frequency 0 Hz to 200.0 kHz
(200 Hz increments)
Flatness (in band) <1.0 dB
Crest factor
Baseband 12 dB (0 Hz center frequency)
Non-baseband 15 dB
Two-Tone
Type Sine-sine, sine-square
Sine frequency 0.001 Hz to 200 kHz
Square frequency 0.1 Hz to 5 kHz
Square resolution 2 digits
SFDR >90 dB
DS360 Specifications
Stanford Research Systems phone: (408)744-9040
www.thinkSRS.com
Sine or Square Burst
On cycles 1/2, 1 to 65534 cycles
Repetition rate 1 to 65535 cycles
Triggering Internal, external, single-shot,
externally gated
Off level 0.0 % to 100.0 % (of on level)
Off resolution 0.1 %
Max. off attenuation −90 dBc (1 kHz)
−70 dBc (10 kHz)
−58 dBc (100 kHz)
White or Pink Noise Bursts
On time 10 µs to 599.9 s
Repetition time 20 µs to 600 s
Triggering Internal, external, single-shot,
externally gated
Off level 0.0 % to 100.0 % (of on level)
Resolution 0.1 %
Sine or Square Sweeps
Type Linear or logarithmic
Range 0.001 Hz to 200.000 kHz
Rate 0.1 Hz to 3.1 kHz
Resolution 2 digits
Flatness ±0.1 dB (1 %)
Frequency
Resolution 6 digits or 1 mHz
(whichever is greater)
Accuracy 25 ppm (0.0025 %) + 4 mHz
(20 °C to 40 °C)
Amplitude
Unbalanced outputs 5.0 µVpp to 14.4 Vpp (50 Ω load )
5.0 µVpp to 20.0 Vpp (600 Ω load )
10.0 µVpp to 40.0 Vpp (Hi-Z load )
Balanced outputs 10 µVpp to 28.8 Vpp (50 Ω load )
10 µVpp to 28.8 Vpp (150 Ω load )
10 µVpp to 40.0 Vpp (600 Ω load )
20 µVpp to 80.0 Vpp (Hi-Z load )
Resolution 4 digits or 1 µV, whichever is
greater (Vpp or Vrms),
0.1 dB (dBm or dBV)
Accuracy ±0.1 dB (1 %)
Noise (broadband)
(for a 1 kHz sine wave into Hi-Z load)
<12.6 mVpp <4 nV/√Hz
12.6 mVpp to 126 mVpp <7.5 nV/√Hz
126 mVpp to 1.26 Vpp <15 nV/√Hz
1.26 Vpp to 40 Vpp <150 nV/√Hz
Offset
Unbalanced output 0 to ±7.4 VDC (50 Ω load )
0 to ±10.0 VDC (600 Ω load )
0 to ±20.0 VDC (Hi-Z load )
Balanced output Not active
Resolution 3 digits
Accuracy
(all except pink noise)
1 % ± 25 mV (Vp+offset > 0.63 V)
1 % ± 2.5 mV (0.63 V > Vp+offset > 0.063 V)
1 % ± 250 µV (63 mV > Vp+offset > 6.3 mV)
1 % ± 25 µV (Vp+offset < 6.3 mV)
(pink noise)
1 % ± 200 mV (Vp+offset > 0.63 V)
1 % ± 20 mV (0.63 V > Vp+offset > 0.063 V)
1 % ± 2 mV (63 mV > Vp+offset > 6.3 mV)
1 % ± 200 µV (Vp+offset < 6.3 mV)
Outputs
Configuration Balanced and unbalanced
Connectors Floating BNCs, banana plugs and
XLR jack
Source impedance
Balanced 50 Ω ± 3 %
150 Ω ± 2 %
600 Ω ± 1 %
Hi-Z (50 Ω ± 3 %)
Unbalanced 50 Ω ± 3 %
600 Ω ± 1 %
Hi-Z (25 Ω ± 1 Ω)
Floating voltage ±40 VDC (max.)
Digital Output
Output types AES-EBU (balanced XLR)
S/PDIF (RCA phone jack and optical)
Sample rate 32.0 kHz, 44.1 kHz and 48.0 kHz
DS360 Specifications
Stanford Research Systems phone: (408)744-9040
www.thinkSRS.com
Accuracy ±100 ppm
Output waveforms Sine, two-tones (dual sine waves)
Output frequency
(32.0 kHz) 0.001 Hz to 14.5 kHz
(44.1 kHz) 0.001 Hz to 20.0 kHz
(48.0 kHz) 0.001 Hz to 20.0 kHz
Frequency resolution 6 digits or 1 mHz (which ever
is greater)
Output amplitude
Range 0 % to 100 %
Resolution 0.00001 %
# of bits per word 16 to 20 (AES-EBU)
16 (S/PDIF)
Other Outputs
Sync TTL level (same frequency
and phase as output)
Burst out TTL pulse marks burst (TTL high
for ON time)
Trigger/gate in TTL pulse starts sweep or burst
TTL high activates gated burst
Sweep TTL pulse marks beginning of sweep
General
Computer interfaces GPIB and RS-232. All instrument
functions can be controlled.
Size 17" × 3.5" × 16.25" (WHD)
Weight 17 lbs.
Power 50 W, 100/120/220/240 VAC,
50/60 Hz
Warranty One year parts and labor on defects
in materials and workmanship
Ordering Information
DS360 Low-distortion function generator $2595
O360RM Rack mount kit $85
DS360 block diagram
Main CPU
Display
Keys
Interfaces
Distortion
Anti
Reduction
Imaging
Filters
56002
DSP Chip
20 bit D/A
Filter
Sine
Comparator
Square
Burst Control
Logic
Burst Level
Fine Amplitude
Control
Burst
Normal
Power
Amplifier
+
_
Attenuators
Attenuator
Attenuator
Course
Source
Resistors
+
_
Sync
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