Stanford Research Systems SR865
2 MHz lock-in amplifier
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Description
- 1 mHz to 2 MHz (operates to 2.5 MHz)
- Low noise voltage and current inputs
- 1 µs to 30 ks time constants
- High bandwidth outputs
- Touchscreen data display - large numeric results, chart recordings, & FFT displays
- 10 MHz timebase input and output
- GPIB, RS-232, Ethernet and USB
- HDMI video output
| Signal Channel | |
| Voltage inputs | Single-ended (A) or differential (A-B) |
| Sensitivity (output scale) | 1 nV to 1 V (voltage input) 1 fA to 1 µA (current input) |
| Voltage Input range | 10 mV to 1 V (peak). |
| Current input range | 1 µA or 10 nA (peak) |
| Max input before overload | 1 V (peak) or 1 µA (peak) |
| Input impedance | |
| Voltage input | 10 MΩ + 25 pF, AC (>1 Hz) or DC coupled |
| Current input | 1 kΩ or 100 Ω to virtual ground |
| Gain accuracy | ±1 % (<200 kHz), ±2 % (to 2 MHz). Signal amplitude must be less than 30% of input range. |
| Noise | 2.5 nV/√Hz at 1 kHz (10 mV input range, typ.) |
| Harmonic distortion | -80 dB (<100 kHz), -60 dB (>100 kHz) |
| CMRR | 90 dB at 1 kHz (DC coupled) |
| Dynamic reserve | 120 dB (typ) |
| Reference Channel | |
| Frequency range | 0.001 Hz to 2 MHz, specified. (operates to 2.5 MHz) |
| Timebase | 10 MHz In/Out (phase locks the internal frequency to other SR865s.) |
| Input impedance | 1 MΩ or 50 Ω |
| Phase setting resolution | (360/232) degrees |
| Phase noise | |
| Int. reference | <0.0001° rms at 1 kHz (100 ms, 12 dB/oct) |
| Ext. reference (typ) | <0.001° rms at 1 kHz (100 ms, 12 dB/oct) |
| Phase drift (typ)
| Sine Out to signal In (200 mVrms) <0.002°/°C below 20 kHz (DC coupled) <0.02°/°C below 200 kHz <0.2°/°C below 2 MHz |
| Harmonic detection | Detect at N × fref where N<99 and (N × fref ) < 2 MHz |
| Dual F reference | Detect at fdual =¦fint - fext¦ All frequencies must be less than 2 MHz |
| Chopper reference | SR865 drives SR540 Chopper (via Aux Out 4) to lock the chopper to fint |
| Demodulator | |
| DC stability | Digital output values have no offset drift |
| Time constants | 1 µs to 30 ks |
| Low pass filters | Typical RC-type filters or advanced Gaussian/Phase-Linear filters |
| Filter slope | 6, 12, 18 or 24 dB/oct rolloff |
| Synchronous filter | Available below 4 kHz |
| Harmonic rejection | -80 dB |
| Low latency output | Rear-panel BlazeX output with <2 µs delay (plus LPF rise/fall times). |
| Internal Oscillator | |
| Frequency | 1 mHz to 2 MHz, specified (operates to 2.5 MHz) |
| Frequency accuracy | 25 ppm + 30 µHz (with internal timebase) |
| External timebase | 10 MHz timebase input/output on rear panel |
| Frequency resolution | 6 digits or 0.1 mHz (whichever is greater) |
| Sine Output | |
| Outputs | Differential or single-ended |
| Output impedance | 50 Ω source |
| Amplitude | 1 nVrms to 2 Vrms (specified amplitude is differential into 50 Ω loads) Output amplitude is halved when used single-ended Output amplitude is doubled into a high impedance load |
| Amplitude resolution | 3 digits or 1 nV, whichever is greater |
| DC offset | ±5 V, differential or common mode |
| Offset resolution | 3 digits or 0.1 mV, whichever is greater |
| Output limit | ±6 V, sum of DC offset and peak amplitude |
| Amplitude stability | 50 ppm/°C (typ) |
| Sync | Logic level sync on rear panel (via BlazeX output) |
| Data | |
| Data channels | 4 data channels are displayed and graphed (green, blue, yellow, orange) |
| Data sources | Each data channel can be assigned any of these data sources: X, Y, R, Θ, Aux In 1 to 4, Aux Out 1 to 2, X noise, Y noise, Sine Out Amplitude, Sine Out DC Level, Reference Phase, or Reference Frequency |
| Data history | All data sources are continually stored at all chart display time scales. The complete stored history of any data source can be displayed at any time. |
| Offset | X, Y and R may be offset up to ±999 % of the output scale |
| Expand | X, Y and R may be expanded by ×10 or ×100 |
| Ratio | X and Y may be ratioed by Aux In 3. R may be ratioed by Aux In 4 |
| Capture buffer | 1 Mpoints internal data storage. Store (X), (X and Y), (R and Θ) or (X, Y, R and Θ) at sample rates up to 1.25 MHz. This is in addition to the data histories for the chart display. |
| Data streaming | Realtime streaming of data, either (X), (X and Y), (R and Θ), or (X, Y, R and Θ) at sample rate to 1.25 MHz over Ethernet interface |
| Scanning | One of the following parameters may be scanned: fint, Sine Out Amplitude, Sine Out DC Level, Aux Out 1 or 2. |
| FFT | |
| Source | Input ADC, demodulator output, or filter output |
| Record length | I1024 bins |
| Averaging | Exponential rms |
| Inputs and Outputs | |
| CH1 output | Proportional to X or R, ±10 V full scale thru 50 Ω |
| CH2 output | Proportional to Y or Θ, ±10 V full scale thru 50 Ω |
| X and Y rear-panel outputs | Proportional to X and Y, ±10 V full scale thru 50 Ω |
| BlazeX | Low latency output of X, ±2.0 V full scale or logic level reference sync output, either thru 50 Ω |
| Aux outputs | 4 BNC D/A outputs, ±10.5 V thru 50 Ω, 1 mV resolution |
| Aux inputs | 4 BNC A/D inputs, ±10.5 V, 1 mV resolution, 1 MΩ input |
| Trigger input | TTL input triggers storage into the internal capture buffer |
| Monitor output | Analog output of the signal amplifier |
| HDMI | Video output to external monitor or TV, 640 × 480, 60 Hz |
| Timebase I/O | 1 Vrms, 10 MHz clock to synchronize internal reference frequency to other units |
| General | |
| Interfaces | IEEE488.2, RS-232, USB device and Ethernet. |
| USB flash | Front-panel slot for USB flash storage of screen shots and data |
| Preamp power | 9-pin D connector to power SRS preamps |
| Power | 60 W, 100/120/220/240 VAC, 50/60 Hz |
| Dimensions | 17" × 5.25" × 17" (WHL) |
| Weight | 22 lbs. |
| Warranty | One year parts and labor on defects in materials and workmanship |