锁相放大器是一种检测淹没在噪声中的重复信号（交流）的测量仪器。
也可将其看成是一种具有抗噪声性能的高灵敏度交流电压表。在进行测量时，除了一些特殊情况，都需要参照信号。一般情况下，直接把测量用的信号源连接到参照信号输入端。
它广泛地应用在分光分析等物理化学研究领域。
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Sensitivity
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100nV to 1V fullscale, in 1-3 steps
(10nV at the METER MAG operation)
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Frequency range
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0.5Hz to 200kHz
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Input type
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Differential
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Input impedence
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10M // 40pF
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Common-mode rejection ratio
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110dB or greater(at 1 kHz)
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Input referred noise
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5nV /√Hz or lower(at 1 kHz)
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Filter
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LPF, HPF, BPF, automatic tuning is available.
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Reference signal mode
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EXT F/2F, INT F/2F
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Internal oscillator
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0.5Hz to 120kHz
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Measurement display
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DATA1 : One of either A, A(dB), A% X(Acosφ), X(dB), X(%)
DATA2 : One of either φ or Y (Asin φ)
DATA3 : One of either ratio,reference frequency, EXT DC
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Monitoring meter
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Acosφ and Asinφ
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Time constant
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1ms to 30s, 6dB/oct or 12dB/oct
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Averaging functions
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Linear or exponential averaging mode
No. of averages : 21 to 29
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Interface
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GPIB, RS-232C
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Power requirements
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AC100, 120, 220 or 240V switchable
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Dimensions(mm)
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432(W) X 132.5(H) X 500(D)
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Weight
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approx.13.5kg
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