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

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。

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

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
Distortion	<-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
File formats	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