The Stanford Research Systems DS335 is a 3.1 MHz synthesized function generator that utilizes direct digital synthesis (DDS) to provide high-resolution, phase-continuous waveforms. It generates sine, square, triangle, and ramp waves, alongside a 10 MHz white noise source, with a frequency resolution of 1 µHz. The DS335 also includes linear and logarithmic frequency sweeps, binary FSK modulation, and optional GPIB and RS-232 digital interfaces for computer control.
Specifications
General
| Parameter | Value |
|---|---|
| Interfaces | GPIB and RS-232 (with Option 01) |
| Display | 12-digit green LED |
| Setup Storage | 9 instrument configurations |
Physical
| Parameter | Value |
|---|---|
| Power Supply | 100/120/220/240 VAC, 50/60 Hz, 22 W |
| Operating Temperature | 0°C to 50°C |
| Dimensions (W×H×D) | 216 mm × 89 mm × 330 mm |
| Weight | 3.6 kg |
Waveform Characteristics
| Parameter | Value |
|---|---|
| Standard Waveforms | Sine, Square, Triangle, Ramp, Noise |
Frequency Specifications
| Parameter | Value |
|---|---|
| Sine Frequency Range | 1 µHz to 3.1 MHz |
| Square Frequency Range | 1 µHz to 3.1 MHz |
| Triangle Frequency Range | 1 µHz to 10 kHz |
| Ramp Frequency Range | 1 µHz to 10 kHz |
| Noise Bandwidth | 10 MHz |
| Frequency Resolution | 1 µHz |
| Frequency Accuracy | ±5 ppm (0°C to 50°C) |
| Aging Rate | < 5 ppm/year |
Amplitude & Output Characteristics
| Parameter | Value |
|---|---|
| Amplitude Range (50 Ω) | 50 mVpp to 10 Vpp |
| Amplitude Range (Open Circuit) | 100 mVpp to 20 Vpp |
| Amplitude Resolution | 3 digits |
| Amplitude Accuracy (at 1 kHz) | ±0.1 dB (1.15%) of setting for amplitudes > 0.1 Vpp |
| Sine Flatness (100 Hz to 1 MHz) | ±0.15 dB |
| Sine Flatness (1 MHz to 3.1 MHz) | ±0.3 dB |
| Output Impedance | 50 Ω |
| DC Offset Range (50 Ω) | ±5 VDC |
| DC Offset Range (Open Circuit) | ±10 VDC |
| Output Protection | Short-circuit protected |
Sine Wave Distortion & Purity
| Parameter | Value |
|---|---|
| Harmonic Distortion (DC to 20 kHz) | <-55 dBc |
| Harmonic Distortion (20 kHz to 100 kHz) | <-50 dBc |
| Harmonic Distortion (100 kHz to 1 MHz) | <-40 dBc |
| Harmonic Distortion (1 MHz to 3.1 MHz) | <-35 dBc |
| Spurious Noise (<100 kHz) | <-55 dBc (DC to 1 MHz) |
| Phase Noise | <-50 dBc in a 30 kHz band centered on the carrier |
Square Wave Characteristics
| Parameter | Value |
|---|---|
| Square Wave Rise/Fall Time | <15 ns (10% to 90% at full output) |
| Square Wave Overshoot | <5% (at full output) |
| Square Wave Symmetry | 50% ± 1% |
Ramp Characteristics
| Parameter | Value |
|---|---|
| Ramp Symmetry Range | 0% to 100% |
| Ramp Symmetry Resolution | 1% |
| Ramp Linearity | <0.1% of full scale |
Noise Characteristics
| Parameter | Value |
|---|---|
| Noise Type | Pseudo-random White Noise |
| Noise Flatness (DC to 100 kHz) | <±1.0 dB |
| Noise Flatness (100 kHz to 1 MHz) | <±2.0 dB |
| Noise Flatness (1 MHz to 10 MHz) | <±3.0 dB |
Sweep & Modulation
| Parameter | Value |
|---|---|
| Sweep Type | Linear or Logarithmic |
| Sweep Rate | 0.01 Hz to 1 kHz |
| Sweep Time Range | 1 ms to 100 s |
| Sweep Span | 1 µHz to 3.1 MHz |
| Sweep Phase | Phase continuous |
| Modulation Type | Binary FSK (Frequency Shift Keying) |
| FSK Rate (Internal) | 0.01 Hz to 50 kHz |
| FSK Rate (External) | DC to 1 MHz (TTL input) |
Inputs & Outputs
| Parameter | Value |
|---|---|
| Main Output Connector | Front-panel BNC |
| Sync Output | Front-panel BNC, TTL level |
| Trigger Input | Rear-panel BNC, TTL level |
| FSK Input | Rear-panel BNC, TTL level |
| External Clock Input Frequency | 10 MHz |
| Clock Output Frequency | 10 MHz |
| Clock Output Level | TTL (into 50 Ω) |
| FSK/Trig Input Impedance | >10 kΩ |
Clock & Synchronization
| Parameter | Value |
|---|---|
| External Clock Input | Rear-panel BNC, 10 MHz, -2 dBm to +15 dBm |
| Clock Output | Rear-panel BNC, 10 MHz, TTL level into 50 Ω |
Physical & Environmental
| Parameter | Value |
|---|---|
| Operating Humidity Range | Up to 95% non-condensing |
Connectivity
| Parameter | Value |
|---|---|
| Standard Interfaces Option | Option 01 adds GPIB (IEEE-488) and RS-232 |
Timebase
| Parameter | Value |
|---|---|
| Standard Timebase Stability | ±5 ppm (0 °C to 50 °C) |
| Option 01 TCXO Frequency Stability | ±1 ppm (0 °C to 50 °C) |
| Option 01 TCXO Aging Rate | ±1 ppm/year |
| Standard Timebase Frequency | 10 MHz |
Phase
| Parameter | Value |
|---|---|
| Phase Range | -360° to +360° |
| Phase Resolution | 0.001° |
Sine Wave Performance
| Parameter | Value |
|---|---|
| Spurious Components (DC to 1 MHz) | <-50 dBc |
| Spurious Components (1 MHz to 3.1 MHz) | <-40 dBc |
DC Offset
| Parameter | Value |
|---|---|
| DC Offset Resolution | 3 digits |
Power
| Parameter | Value |
|---|---|
| Power Consumption | 35 W |
Auxiliary Inputs & Outputs
| Parameter | Value |
|---|---|
| Sync Output Level | TTL |
Technology
Direct Digital Synthesis (DDS)
Applications
Electronic testing, signal modulation, and waveform generation