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High-response and High-stability |
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Up to 11 MHz with the wide-band, high-frequency (LI5660) |
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Voltage measurements can be made with a single end (A) or differential (A-B)
input, as well as 10 Vrms input (C) and high-frequency input (HF) terminals with the LI5660. The HF
input terminals can be used to measure up to 11 MHz. |
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Fractional Harmonic Measurements
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In addition to the frequency of the reference signal, its harmonic content can also be measured.
Harmonics can be set not only for integers, but also for fractions in the range of (1 to 63) / (1 to
63).
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Fractional Harmonic
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Dual-frequency Simultaneous Measurements (LI5660/LI5655/LI5650) |
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Dual-phase (Rcosθ, Rsinθ), Dual PSDs (Primary PSD, Secondary PSD)
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A lock-in amplifier equipped with a dual-phase high-sensitivity detector (PSD) can simultaneously
measure dual frequency components contained in an input signal. A general-purpose lock-in amplifier
requires two units, but one unit can measure dual frequencies.
Dual frequency settings can be set for external reference signals and their calculations, or for
internal oscillator signals and their calculations. By using this function together with the fraction
setting for harmonic measurement, mutual interference during dual frequency measurement can be
reduced. For example, if the harmonic measurement frequency is set to a fraction of a prime number,
the influence of harmonics equal to or less than the multiplication value of the set prime number can
be eliminated.
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Detection Mode (Dual 1)
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Detection Mode |
Primary PSD
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Secondary PSD
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Function
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SINGLE*
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Fundamental / Fractional Harmonic
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None |
2-phase detection is at one frequency. |
DUAL1 |
Fundamental / Fractional Harmonic
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Fundamental / Harmonic |
Simultaneous measurement of the fundamental wave
and its harmonic components included in a single input signal |
DUAL2 |
Primary Frequency |
Secondary Frequency
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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. |
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*The detection mode of LI5645 is "SINGLE" mode only.
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Low Frequency Measurement |
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Display and Sampling of Output Data |
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High Speed Sampling of Analog Data
The digital data of output is sampled at high speed and converted to an analog signal.
- LI5660/LI5655: up to approximately 1.5 M samples/s
- LI5660/LI5655: up to approximately 1.5 M samples/s
It is useful to detect peak signals when measuring by differential calculus such as
Auger electron spectroscopy.
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Digital Data Buffer Function
If the number of data points is large in high-speed measurement, it may not be
possible to transfer all data due to the communication speed of the interface.
NF's lock-in amplifier has a data buffer function that temporarily stores digital data. By temporary
storing the measurement data in a buffer and transferring the data sequentially, a large amount of
data can be transmitted without loss.
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External 10 MHz Synchronization |
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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 |
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Wide Range of Functions in a Thin, Compact Body |
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