DSP锁相放大器

SR830和SR810数字锁相放大器具有高性能，低价格等优势。SR830数字锁相放大器既显示幅值，有显示相位值。SR810锁相放大器只显示幅值。
使用数字处理技术（DSP）完全取代了传统的由解调器，滤波器和放大器组成的锁相放大器。

主要性能：
频率范围1mHz 到102.4kHz 
＞100dB 的动态保留 
稳定性为5ppm/℃ 
0.01 度的相位分辨率 
时间常数为10μs 到30ks（*大24dB倍频程衰减速率） 
具有自动获取，自动定相，自动存储
自动补偿功能 
合成参考光源 
GPIB 和RS-232 两种接口

技术参数
信号通道

电压输入             Single-ended differential
分辨率                 2 nV to 1 V
电流输入             10⁶  10⁸ V/A
输入阻抗
        电压             10 MΩ + 25 pF, AC DC coupled
        电流             1 kΩ to virtual ground
增益精度             ±1 % (±0.2 % typ.)
噪声 (typ.)           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)
线性滤波             50/60 Hz 100/120 Hz (Q = 4 )
CMRR                 100 dB to 10 kHz, decreasing by 6 dB/oct above 10 kHz
动态范围              >100 dB (without prefilters)
稳定性                  <5 ppm/°C

参考通道
频率范围              0.001 Hz to 102.4 kHz
参考输入              TTL sine (400 mVpp min.)
输入阻抗              1 MΩ, 25 pF
相位分辨率          0.01° front panel, 0.008° through computer interface
绝对相位误差      <1°
相对相位误差      <0.001°
正交性                  90° ± 0.001°
相位噪声
               Internal ref. Synthesized, <0.0001° rms at 1 kHz
               External ref. 0.005° rms at 1 kHz (100 ms time constant, 12 dB/oct)
相位漂移             <0.01°/°C below 10 kHz,
                             <0.1°/°C above 10 kHz
谐波检测             2F, 3F, ... nF to 102 kHz (n < 19,999)
收集时间             (2 cycles + 5 ms) 40 ms,whichever is larger

解调器
稳定性                 Digital outputs display: no drift Analog outputs: <5 ppm/°C for all dynamic 
                             reserve settings
谐波抑制器         −90 dB
时间常数             10 μs to 30 ks (6, 12, 18, 24 dB/oct rolloff). Synchronous filters available below 200 Hz.

内部振荡器
范围                    1 mHz to 102 kHz
频率精度            25 ppm + 30 μHz
频率分辨率        4½ digits 0.1 mHz, whichever is greater
失真                    −80 dBc (f <10 kHz), −70 dBc(f >10 kHz) @ 1 Vrms amplitude
振幅                    0.004 to 5 Vrms into 10 kΩ (2 mV resolution), 50 Ω output impedance, 50 mA maximum 
                            current into 50 Ω Amplitude accuracy 1 % Amplitude stability 50 ppm/°C Outputs Sine, 
                            TTL (When using an external reference, both outputs are phase locked to the external
                            reference.)

显示
通道1                   4½-digit LED display with 40-segment LED bar graph. X, R, X-noise, Aux 1 Aux 2. The 
                              display can also be any of these quantities divided by Aux 1 Aux 2.
通道2                   (SR830) 4½-digit LED display with 40-segment LED bar graph. Y, θ, Y-noise, Aux 3  
                              Aux 4. The display can also be any of these quantities divided by Aux 3 Aux 4. 
补偿                      X, Y, R can be offset up to ±105 % of full scale.
放大倍率              X, Y, R can be expanded by 10× 100×.
参考                      4½-digit LED display

输入和输出
CH1输出              X, R, X-noise, Aux 1 Aux 2,(±10 V), updated at 512 Hz
CH2输出              (SR830) Y, θ, Y-noise, Aux 3 Aux 4,(±10 V), updated at 512 Hz
X, Y输出                In-phase quadrature components (rear panel) (±10 V), updated at 256 kHz.
Aux. A/D inputs              4 BNC inputs, 16-bit, ±10 V,1 mV resolution, sampled at 512 Hz
Aux. D/A outputs            4 BNC outputs, 16-bit, ±10 V, 1 mV resolution 
正弦                         Internal oscillator analog output
TTL输出                  Internal oscillator TTL output
数据缓冲器             The SR810 has an 8k point buffer.
                                 The SR830 has two 16k point buffers. Data is recorded at rates to 512 Hz read 
                                  through the computer interfaces.
触发输入 (TTL)      Trigger synchronizes data recording
远程放大器              Provides power to the optional SR550, R552 SR554 preamps

规格
连接口                       IEEE-488.2 RS-232 interfaces standard. All instrument functions can be 
                                   controlled read through IEEE-488.2 RS-232 interfaces.