Stanford Research Systems DS360 Specifications Sheet

Ultra Low Distortion
Function Generator

200 kHz Ultra
Low Distortion
DDS Function
Generator

DS360.....$2595 (U.S. list)

0.001% THD (-100 dB)

The performance of a low distortion analog source and

the precision of direct digital synthesis (DDS) is
combined in a unique new instrument - the DS360
from SRS. 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

¥ 25 ppm frequency accuracy

¥ 1 mHz to 200 kHz freq. range

¥ Sine, square, two-tone, burst

¥ Pink and white noise

¥ Log & linear freq. sweeps

¥ 10 µVpp to 40 Vpp

¥ SPDIF/EIAJ and AES-EBU digital

output formats

¥ GPIB and RS-232 interfaces

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. And 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.

Rock solid frequency stability

Low distortion analog sources have impressive T H D
specifications, but when it comes to frequency accura­cy and resolution, they canÕt touch the precision of
DDS generators. The DS360 delivers 0.0025% fre­quency accuracy over its entire frequency range. It also
boasts six 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!

(standard)

Not just sine waves

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 bandlimited
white noise.

Audio outputs

All functions and parameters are easily set using the
front panel keypad and spin knob. For convenience, a
wide variety of amplitude units including Vrms, V p p ,
d B V, 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. The DS360 provides
outstanding amplitude flatness (0.5% up to 20 kHz)
during frequency sweeps and has a T T L 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 (GPIB)
and RS-232 interfaces the DS360 is fully computer
programmable – a feature seldom found in low
distortion sources. All instrument functions can be
controlled or queried through the computer interfaces.
The user’s manual contains sample programs written in
C, BASIC and FORTRAN for GPIB and RS-232
communication.

A very versatile source

The DS360 combines outstanding frequency precision,

ultra low distortion, computer programmability and
more features than any generator in its class. It’s the
only audio frequency source that has it all. Call our
applications engineers for more details on the DS360

and our other audio frequency test equipment.

Specifications

Frequency

Range 1 mHz to 200 kHz
Resolution 6 digits
Accuracy 25 ppm (0.0025%)

Amplitude

Unbalanced Outputs:

50 Ω Load 5.0 µVpp - 14.4 Vpp
600 Ω Load 5.0 µVpp - 20.0 Vpp
Hi-Z Load 10.0 µVpp - 40.0 Vpp

Balanced Outputs:

50 Ω Load 10.0 µVpp - 28.8 Vpp
150 Ω Load 10.0 µVpp - 28.8 Vpp
600 Ω Load 10.0 µVpp - 40.0 Vpp

Hi-Z Load 20.0 µVpp - 80.0 Vpp
Resolution 0.01 dB or 1 µV, whichever is greater
Accuracy ±0.1 dB (1.0%)

Distortion and Noise

THD:

Unbalanced Outputs -100 dB to 20 kHz

-85 dB to 200 kHz

Balanced Outputs -97 dB to 20 kHz

-82 dB to 200 kHz

Broadband Noise < 1 µV/√Hz (1 Vrms, 1 kHz)

Outputs

Configuration Balanced and Unbalanced
Connectors Floating BNCs, banana connectors, and

XLR jack

Source Impedance:

Balanced 50 Ω, 150 Ω, and 600 Ω

Unbalanced 25 Ω, 50 Ω, and 600 Ω
Max. Float Volt. ±40 VDC

Waveforms

Sine 0.001 Hz to 200 kHz
Square 0.001 Hz to 200 kHz, 700 ns rise time
Noise White, pink, and bandlimited white
Two-Tone Combination of two sine waves, or sine and

square wave. Frequency and amplitude are
independently set for each wave.

Burst:

ON Cycles 0.5 or 1 to 65534 cycles
Repetition Rate 1 to 65534 cycles
Triggering Internally triggered, externally triggered, or

externally gated

Sweeps

Type Linear or logarithmic
Range 1 mHz to 200 kHz
Rate 0.01 Hz to 3.1 kHz
Flatness ±0.1 dB (1.0%)

Other Outputs

Sync TTL square wave (same frequency as output)
Trigger Out Internal burst trigger
Trigger/Gate In TTL pulse starts sweep or externally triggered

burst. TTL high level activates externally

gated burst.
Sweep TTL pulse marks start of sweep
Digital Outputs AES-EBU (balanced XLR) and SPDIF/EIAJ

formats (RCA and optical)

General

Computer Interfaces GPIB and RS-232. All instrument functions

can be controlled over the interfaces.
Size 17"W x 3.5"H x 16.25"D
Weight 17 lbs.
Power 50 W, 100/120/220/240 VAC 50/60 Hz
Warranty One year parts and labor on any defects in

material or workmanship.

Ordering Information (all prices U.S. list)

DS360 Ultra low Distortion $ 2595

Function Generator

O360RM Rack Mount $ 85

1290 D Reamwood Avenue ¥ Sunnyvale, CA94089
Telephone [phone] ¥ FAX: [phone]

Printed in USA ©1995 Stanford Research Systems, Inc. All specifications and prices subject to change (3/95)