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DSP鎖相放大器

美國斯坦福公司生產(chǎn)的SR830和SR810數(shù)字鎖相放大器具有高性能，低價格等優(yōu)勢。SR830數(shù)字鎖相放大器既顯示幅值，有顯示相位值。SR810鎖相放大器只顯示幅值。
使用數(shù)字處理技術（DSP）完全取代了傳統(tǒng)的由解調(diào)器，濾波器和放大器組成的鎖相放大器。
主要性能：
■ 更頻率范圍1mHz 到102.4kHz
■ ＞100dB 的動態(tài)保留
■ 穩(wěn)定性為5ppm/℃
■ 0.01 度的相位分辨率
■ 時間常數(shù)為10μs 到30ks（zui大24dB倍頻程衰減速率）
■ 具有自動獲取，自動定相，自動存儲
■ 自動補償功能
■ 合成參考光源
■ GPIB 和RS-232 兩種接口
技術參數(shù)：

信號通道：

電壓輸入

Single-ended or differential

分辨率

 2 nV to 1 V

電流輸入

106 or 108 V/A

輸入阻抗電壓

10 MΩ + 25 pF, AC or DC coupled

輸入阻抗電流

1 kΩ to virtual ground

增益精度

±1 % (±0.2 % typ.)

噪聲 (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)

線性濾波

50/60 Hz and 100/120 Hz (Q = 4 )

CMRR

100 dB to 10 kHz, decreasing by 6 dB/oct above 10 kHz

動態(tài)范圍 

>100 dB (without prefilters)

穩(wěn)定性

 <5 ppm/°C


信參考通道：


頻率范圍

0.001 Hz to 102.4 kHz

參考輸入

TTL or sine (400 mVpp min.)

輸入阻抗

1 MΩ, 25 pF

相位分辨率

0.01° front panel, 0.008° through computer interface

絕對相位誤差

<1°

相對相位誤差

<0.001°

正交性

90° ± 0.001°

相位噪聲

Internal ref. Synthesized, <0.0001° rms at 1 kHzExternal 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

諧波檢測

2F, 3F, ... nF to 102 kHz (n < 19,999)

收集時間

(2 cycles + 5 ms) or 40 ms,whichever is larger


解調(diào)器：


穩(wěn)定性

Digital outputs and display: no drift Analog outputs: <5 ppm/°C for all dynamic reserve settings

諧波抑制器

-90 dB

時間常數(shù) 

10 μs to 30 ks (6, 12, 18, 24 dB/oct rolloff). Synchronous filters available below 200 Hz.


內(nèi)部振蕩器：


范圍

1 mHz to 102 kHz

頻率精度

25 ppm + 30 μHz

頻率分辨率

4 1/2 digits or 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.)


顯示：

通道1

4 1/2 -digit LED display with 40-segment LED bar graph. X, R, X-noise, Aux 1 or Aux 2. The display can also be any of these quantities divided by Aux 1 or Aux 2.

通道2

(SR830) 4 1/2 -digit LED display with 40-segment LED bar graph. Y, θ, Y-noise, Aux 3 or Aux 4. The display can also be any of these quantities divided by Aux 3 or Aux 4.

補償

X, Y, R can be offset up to ±105 % of full scale.

放大倍率

X, Y, R can be expanded by 10× or 100×.

參考

4 1/2 -digit LED display


輸入和輸出：


CH1輸出

X, R, X-noise, Aux 1 or Aux 2,(±10 V), updated at 512 Hz

CH2輸出

(SR830) Y, θ, Y-noise, Aux 3 or Aux 4,(±10 V), updated at 512 Hz

X, Y輸出

In-phase and 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輸出

Internal oscillator TTL output

數(shù)據(jù)緩沖器 

The SR810 has an 8k point buffer. The SR830 has two 16k point buffers. Data is recorded at rates to 512 Hz and read through the computer interfaces.

觸發(fā)輸入 (TTL)  

Trigger synchronizes data recording

遠程放大器 

Provides power to the optional SR550, R552 and SR554 preamps

連接口  

IEEE-488.2 and RS-232 interfaces standard. All instrument functions can be controlled and read through IEEE-488.2 or RS-232 interfaces.


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