SR850 — 100 kHz DSP锁相放大器
- 1 mHz至102.4 kHz范围
- > 100分贝动态储备
- 0.001度相位分辨率
- 时间常数从10 s到30 ks
(高达24 dB/oct滚降) - 自动增益、相位、储备和失调
- 数据记录(最多65k个样本)
- 平滑、曲线拟合和统计
- GPIB和RS-232
概观
| SR850是一款基于创新DSP(数字信号处理)架构的数字锁相放大器。SR850拥有许多超越传统的显著性能优势锁相放大器—更高的动态储备 |
SR850 100 kHz DSP锁相放大器
SR850是一款数字占据基于创新DSP(数字信号处理)架构的放大器。SR850拥有许多超越传统的显著性能优势占据放大器——更高的动态储备、更低的漂移、更低的失真和显著更高的相位分辨率。此外，平板显示器和65，536点内存使得以各种格式显示和处理数据成为可能传统锁定.
数字精度
SR850的输入是一个精度18位将256 kHz的输入信号数字化的模数转换器。模数转换器和高速DSP芯片取代了中的模拟解调器(混频器)、低通滤波器和DC放大器传统锁定。SR850不使用模拟元件，而是通过一系列精确的数学计算实现，消除了模拟元件固有的漂移、失调、非线性和老化。同一DSP芯片以数字方式合成基准振荡器，提供失真小于-80 dBc、频率分辨率为100 mHz、幅度分辨率为2 mV的信号源。
数字灵活性
SR850的显示屏支持大量选项。数据可以用数字或条形图、极坐标图和带状图格式查看。凭借65，536点的内存和高达512 Hz的数据采集速率，您可以准确地看到您的数据在时间——不是只是当前的输出值是多少。采集数据后，SR850提供多种数据简化选项，如Savitsky-Golay平滑、曲线拟合和统计分析。标准RS-232和GPIB接口使数据传输到您的计算机变得容易。
SR850 Specifications | |
Signal Channel | |
| Voltage inputs | Single-ended or differential |
| Sensitivity | 2 nV to 1 V |
| Current input | 106 or 108 V/A |
| Input impedance | |
| Voltage input | 10 MΩ + 25 pF, AC or DC coupled |
| Current input | 1 kΩ to virtual ground |
| Gain accuracy | ±1 % (±0.2 % typ.) |
| Noise | 6 nV/√Hz at 1 kHz 0.13 pA/√Hz at 1 kHz (106 V/A) 0.013 pA/√Hz at 100 Hz (108 V/A) |
| Line filters | 50/60 Hz and 100/120 Hz (Q=5) |
| CMRR | 100 dB at 10 kHz. Decreasing by 6 dB/oct above 10 kHz |
| Dynamic reserve | >100 dB (without prefilters) |
| Frequency range | 0.001 Hz to 102.4 kHz |
| Reference input | TTL or sine (400 mVpp min.) |
| Input impedance | 1 MΩ, 25 pF |
| Phase resolution | 0.001° |
| Absolute phase error | <1° |
| Relative phase error | <0.001° |
| Orthogonality | 90° ± 0.001° |
| Phase noise | |
| Int. reference | <0.0001° rms at 1 kHz |
| Ext. reference | 0.005° rms at 1 kHz, 100 ms, 12 dB/oct |
| Phase drift | <0.01°/°C below 10 kHz, <0.1°/°C, 10 kHz to 100 kHz |
| Harmonic detection | 2F, 3F, … nF to 102.4 kHz |
| Acquisition time | (2 cycles + 5 ms) or 40 ms, whichever is greater |
Demodulator | |
| Stability | |
| Digital outputs | no drift |
| Analog outputs | <5 ppm/°C for all dynamic reserves |
| Harmonic rejection | -90 dB |
| Offset/expand | ±100 % offset, expand up to 256× |
| Time constants | 10 µs to 30 ks (6, 12, 18, 24 dB/oct rolloff). Synchronous filtering available below 200 Hz. |
Internal Oscillator | |
| Range | 1 mHz to 102.4 kHz |
| Accuracy | 25 ppm + 30 µHz |
| Resolution | 0.01 % or 0.1 mHz (whichever is greater) |
| Distortion | -80 dBc (f < 10 kHz) -70 dBc (f > 10 kHz) at 1 Vrms |
| Amplitude | 0.004 to 5 Vrms into 10 kΩ (2 mV resolution) |
| Output impedance | 50 Ω |
| Amplitude accuracy | 1 % |
| Amplitude stability | 50 ppm/°C |
| Outputs | Sine and TTL (both can be phase-locked to an external reference) |
| Sweeps | Linear and log |
Inputs and Outputs | |
| Interfaces | IEEE-488.2, RS-232 and Centronics interfaces standard. All instrument functions can be controlled and read though the interfaces. |
| X, Y outputs | ±10 V, updated at 256 ksamples/s |
| CH1 output | ±10 V output of X, R or Trace 1 to 4 |
| CH2 output | ±10 V output of Y, Θ or Trace 1 to 4 |
| Aux. A/D inputs | 4 BNC inputs, 1 mV resolution, ±10 V |
| Aux. D/A outputs | 4 BNC outputs, 1 mV resolution, ±10 V (fixed or swept amplitude) |
| Sine out | Internal oscillator analog output |
| TTL out | Internal oscillator TTL output |
| Trigger In | TTL signal either starts internal oscillator sweeps or triggers instrument data taking (rates to 512 Hz). |
| Remote pre-amp | Provides power to the optional SR550, SR552 and SR554 preamps |
Displays | |
| Screen format | Single or dual display |
| Displayed quantities | Each display shows one trace. Traces are defined as A×B/C or A×B/C2 where A, B, C are selected from X, Y, R, Θ, X noise, Y noise, R noise, Aux 1 to 4 or frequency. |
| Display types | Large numeric readout, bar graph, polar plot or strip chart |
| Data buffer | 64k data points. The buffer can be configured as a single trace with 64k points, 2 traces with 32k points each, or 4 traces with 16k points each. |
| Sample rate | 0.0625 Hz to 512 Hz, external to 512 Hz |
Analysis Functions | |
| Smoothing | 5, 9, 17, 21, 25 pt. (Savitsky-Golay) |
| Curve fitting | Linear, exponential or Gaussian |
| Calculator | Arithmetic, trigonometric and logarithmic calculations |
| Statistics | Mean and standard deviation |
General | |
| Hardcopy | Screen dumps to dot matrix or LaserJet printers. Plots to HP-GL plotters (RS-232 or GPIB). |
| Data storage | USB drive. Storage of data and instrument setups (binary or ASCII). Screens can be saved as PCX files. |
| Power | 60 W, 100/120/220/240 VAC, 50/60 Hz |
| Dimensions | 17″ × 6.25″ × 19.5″ (WHL) |
| Weight | 40 lbs. |
| Warranty | One year parts and labor on defects in materials and workmanship |
