Highresponse and Highstability 

Highresponse and Highstability 




Up to 11 MHz with the wideband, highfrequency input terminal (LI5660) 




Voltage measurements can be made with a single end (A) or differential (AB) input, as well as 10 Vrms input (C) and highfrequency input (HF) terminals with the LI5660. The HF input terminals can be used to measure up to 11 MHz. 

Fractional Harmonic Measurements





Measurements can be made at submultiple frequencies of the fundamental wave (1 to 63) / (1 to 63).
Provide measurement of fractional times frequency of the fundamental wave. In 2frequnecy measurement mode of LI5660/LI5655/LI5645, each primary PSD and secondary PSD individual frequency setting available. For example, primary PSD set as n/m times with reference signal frequency, and secondary PSD set as n times with reference signal frequency or set as different frequency from primary frequency.

Fractional Harmonic 
Harmonic measurements are made at integral multiples between two measurement frequencies (f_{2} = (f_{1} x n) ). In this case, distortion in thef_{1} side signal results in an integral multiple frequency (harmonic), which cannot be distinguished from the f_{2} signal. With subharmonic measurements, measurements can be conducted with the f_{2} = f_{1} x n/m relationship, which means that even if distorted harmonics are generated with f_{1}, the frequency can be set so that it does not affect f_{2}. f_{2} harmonic measurements are possible without being affected by f_{1} harmonics. 


Dualfrequency Simultaneous Measurements 

2phase (Rcosθ, Rsinθ), 2 PSDs (Primary PSD, Secondary PSD) 


LI5660/LI5655/LI5650 come with 2phase sensitive detectors (PSD), allowing simultaneous measurement of two frequency components that are included in a single input signal. Measurements that previously required two lockin amplifiers using the dual beam method can now be made with a single lockin amplifier.
Ratio calculations can be made by determining the ratio between the measured value and reference value, and the secondary PSD can be connected in cascade to the primary PSD, to run detection using the secondary PSD after detecting the signal with the primary PSD. 
Detection Mode (Dual 1)


Detection Mode 
Primary PSD 
Secondary PSD 
Function 
SINGLE* 
Fundamental / Fractional Harmonic 
None 
2phase detection is at one frequency. 
DUAL1 
Fundamental / Fractional Harmonic 
Fundamental / Harmonic 
Simultaneous measurement of the fundamental wave and its harmonic components included in a single input signal 
DUAL2 
Primary Frequency 
Secondary Frequency

Simultaneous measurement of two individual harmonic components included in a single input signal 
CASCADE 
Primary Frequency 
Secondary Frequency 
The secondary PSD is connected in cascade to the primary PSD. 


*The detection mode of LI5645 is "SINGLE" mode only. 

External 10 MHz Synchronization 




Synchronizing operation of other devices such as a signal generator and the LI5600 series using a 10 MHz frequency source allows synchronization to any frequency (can be configured) without having to use an external reference signal (REF IN). 
External 10 MHz Reference Input 

Wide Range of Functions in a Thin, Compact Body 



