Model：LI5640/5630 Country of Origin：Japan
Category：Digital Phase-Locked Loop Amplifier
A lock-in amplifier is a measuring instrument used to detect repetitive signals (AC) buried in noise. It can also be regarded as a highly sensitive AC voltmeter with noise immunity. During measurement, except in some special cases, a reference signal is required. Generally, the signal source used for measurement is directly connected to the reference signal input terminal. It is widely used in physical and chemical research fields such as spectroscopic analysis.
 |
| NF Corporation, with its rich experience and cutting-edge technology in lock-in amplifiers, makes the fullest use of the high-speed computing capability of the digital signal processor (DSP), significantly improving the high speed of functional equipment and measurement response and the stability of output, greatly enhancing compatibility with computer data, and thoroughly pursuing improved operability and reduced cost. |
 | High stability Except for the preamplifier used for input, all circuits are digitally designed, featuring high stability and low drift. In the high-sensitivity range, the output zero drift is reduced to an extremely small level. Phase stability reaches 0.01o/oC, and gain stability reaches ±100ppm/oC. Such superior stability forms the technical basis for high resolution reaching 41/2 digits, low-noise performance with an input-referred noise voltage of 4.5nV/ Hz and a phase noise of 0.001o, and brings ample reliability to the measurement of minute signals. |
| Measurement can start from 1 mHz Measurement starting from 1 mHz has been realized, which is unimaginable in analog lock-in amplifiers. This product provides a completely new method for the analysis of low-speed phenomena such as infrared spectroscopy and temperature response. Because it adopts a digital method, it offers high stability, so there is no need to worry about drift during measurement. For the reference signal, locking takes only about 2 cycles, which brings great convenience to low-frequency signal measurement. |
| Fast and smooth response "Fast and smooth measurement response" The minimum time constant of the waveform detection section is 10μs. The DC output digital-to-analog (D/A) conversion achieves a high speed and high accuracy of up to 256k samples/second at 16 bits. High-speed response results can be obtained at any time not only in X-Y mode but also in R-θ output mode. The storage speed of digital data reaches up to 16k samples/second. In addition, a synchronous filter that can measure the moving average within the signal period is newly provided. In this way, even for a very small time constant, the ripple component in the measured value can be greatly reduced. Moreover, this synchronous filter can be applied over the full frequency range. We invite all users to fully appreciate its fast and smooth response characteristics. "Instant response to setting changes as well" Even if settings such as phase or sensitivity are changed during measurement, since the previous values can be converted into values under the new settings, the response of the measured value is fast and reliable. Thus, even when the time constant is large, there is no need to wait for the response of that long time constant. |
| Simple operation method This product allows one-way settings from left to right in the order of signal input, filter, dynamic reserve, sensitivity, and time constant. The key layout is simple and clear, avoiding setting errors. When measuring an unknown input signal, an extremely convenient Auto-Set key is available for selection. There are 3 large displays, which are more conducive to accurately reading settings and measured values. In addition, a Modify Dial and an analog indicator are provided, allowing you to experience the performance of the digital lock-in amplifier in an analog way. |
| Two product models Two product models are available for selection, among which the LI5640 is a feature-rich multifunction digital lock-in amplifier, while the LI5630 is an economical digital lock-in amplifier that inherits its basic performance while focusing more on simple functions. Both models are 2-phase type. |
 LI5630 | Simple design with high performance The LI5630 inherits the basic performance of the LI 5640 multi-function digital lock-in amplifier while focusing on streamlined functionality, making it an economical digital lock-in amplifier. |
 | Comparison of LI5640 and LI563 |
Features | LI5640 | LI5630 | |
Input | Voltage input |
|
|
Current input |
| -- | |
Reference signal | Internal·External·Signal | External | |
Output | Measurement items | X, Y, R, θ, NOISE, AUX IN | X, Y, R, θ, |
Numeric, meter, external DC output | 2 Channel output | Single-channel output | |
X, Y, R,θUpdate rate | 256k samples/秒 | 256k samples/秒 | |
Built-in oscillator |
| -- | |
Spectral reflectance measurement of materials
 |
Measurement of thermal conductivity properties of materials
 |
Other applications
 | Light measurement (intensity, absorption, etc.) |
| Spectral analysis (general spectroscopy, Auger electron spectroscopy, photoacoustic spectroscopy, Raman spectroscopy, etc.) |
| Optical gyroscope |
| Magnetic measurement (evaluation of magnetic materials, vibrating sample magnetometer, magnetic detection using SQUID) |
| Sensor evaluation |
| Bridge detectors |
| Impedance measurement |
| Mechanical vibration measurement |
| Biological and physiological signal measurement |
Comprehensive support for products related to weak signal measurement
Ultra-low noise amplifier
 | SA Series: This series consists of preamplifiers that push the limits of weak signal detection. In addition to 7 models that support measurement across different frequency bands and input formats, dedicated low-noise power supplies and DC bias power supplies for sensors are also available. |
Differential amplifier
 | 5307: This product is a low-noise differential amplifier with a wide bandwidth from DC to 10 MHz and gain up to 1000x. Because it integrates all the functions required for weak signal amplification, it can be used as a general-purpose preamplifier or differential amplifier in a wide range of applications. |
Low-noise preamplifier
 | The LI-75A preamplifier is used to improve the sensitivity of lock-in amplifiers and eliminate common-mode noise. Gain up to 100x, bandwidth from DC to 1 MHz. |
Current input preamplifier
 | LI-76: This product is widely used as a preamplifier to support current input/voltage output when a photomultiplier performs signal amplification (conversion). |
Looking for more sales, technical and solutions information?
Contact Us >
TEL: 0731-85260926
Fax: 0731-85263946
E-mail: sales@jectronic.com
Address: Room 1015, Building A3, Changsha Yu Center, No. 289 Huanbao Middle Road, Yuhua District, Changsha City
Copyright © Changsha Ligao Jiechuang Instruments Co., Ltd.
Copyright Jectronic instruments ltd, All Rights Reserved
For more information, please follow our WeCom.
Technical Support
Feedback
