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Moku:Lab多功能测量仪之锁相放大器(Lock-in Amplifier)介绍

泰初科技(天津)有限公司 2019-08-19

Moku:Lab多功能测量仪之200MHz锁相放大器可用于探测被噪声掩埋的微弱电压信号。直观的用户界面允许用户使用整个框图中的探针点(probe points)精确配置系统并监控其性能。


Lockinjpg.jpg


主要特色
1、数字信号处理的方框图视图,内置探针点(probe points),用于信号的监测。
2、解调信号的频率高达200 MHz
3、测量被噪声淹没的信号,动态储备超过80 dB。

Moku:Lab多功能测量仪之200MHz锁相放大器视频展示

Moku:Lab多功能测量仪之锁相放大器的应用案例


Moku lock-in amplifier _ SRS.JPG

Moku lock-in amplifer _ photoacoustic spectroscopy.JPG

Moku lock-in amplifier _ TDTR.JPG


Moku:Lab多功能测量仪之锁相放大器的规格参数

Signal channel

Input characteristics

Input frequency range

1kHz - 200MHz

Input voltage range

±0.5 V into 50Ω

Input impedance

50Ω/1MΩ

Input coupling

AC/DC

Demodulator

Sources

Internal Reference oscillator,   Internal Auxiliary oscillator, External direct, External with phase-locked   loop

Types

Internal, External with PLL: Sine   (In-phase)/Cosine (Quadrature)

External direct: Sine (In-phase)

Input gain2

-20 dB/0 dB/+24 dB/+48 dB

Filter mode

Low-pass filter

Filter cut-off frequency range

237 mHz - 3.98 MHz

Filter time-constant

251 ns - 4.219 s

Filter slope

6 dB or 12 dB per octave

Phase shift precision

0.001°

Gain accuracy

±1%

Dynamic reserve

Better than 80 dB

PLL frequency range

2 MHz - 200 MHz

PLL bandwidth

10 kHz


Reference oscillator

Reference and Auxiliary oscillators

Waveform

Sine

Frequency range

1 mHz - 200 MHz

Frequency resolution

3.55μHz

Distortion

<-70 dBc for frequencies lower than   10 kHz

<-60 dBc for frequencies greater   than 10 kHz

2+24 dB and +48 dB input gains are applied digitally and can be used to maximise the Lock-In Amplifier’s dynamic range for weak input signals.

 

Signal output

Output routing

Output sources

X, Y (cartesian mode); R,Θ(polar   mode); Auxiliary Oscillator

Output processing

Direct, PID3

Number of output channels

2

Polar-mode

0.8 V per cycle

Gain profiles

Proportional (P), integral (I),   differential (D), integral saturation (IS), differential saturation (DS)

Controller frequency range

100 mHz - 10 MHz

Proportional gain

±60 dB

Integrator crossover frequency

1.00 Hz to 100 kHz

Differentiator crossover frequency

10 Hz to 1 MHz

Signal output

Output voltage range (peak AC + DC)

±0.5 mV to ±1 V into 50Ω

Gain range

-80 dB to +80 dB


Saving Data

Saving data

File formats

Plain text: records data using a   standard CSV format

Binary: records data using a   proprietary LI format for high-speed data logging.

Note: data saved using the LI format must   be converted to plain text using the LI file converter available here:

https://github.com/liquidinstruments/lireader

Maximum sampling rate

1 MSa/s into RAM (format: *.li binary)   (single channel)

500 kSa/s into RAM (format: *.li   binary) (two channels)

100 kSa/s into SD card (format: *.li   binary)

20 kSa/s into RAM/SD card (format:   *.csv)

Note: data saved to the Moku:Lab’s   on-board RAM will be lost when the device is rebooted.

Export modes

SD Card, Dropbox, E-mail and iCloud,   My Files (iOS 11)

Delayed log start time

Up to 240 hours

Log duration

1 second up to 240 hours

3Only one output may have a PID controller routing at a time


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