鎖相放大器是一種檢測淹沒在噪聲中的重復信號（交流）的測量儀器。
也可將其看成是一種具有抗噪聲性能的高靈敏度交流電壓表。在進行測量時，除了一些特殊情況，都需要參照信號。一般情況下，直接把測量用的信號源連接到參照信號輸入端。
它廣泛地應用在分光分析等物理化學研究領(lǐng)域。 Sensitivity | 100nV to 1V fullscale, in 1-3 steps
(10nV at the METER MAG operation) | Frequency range | 0.5Hz to 200kHz | Input type | Differential | Input impedence | 10M // 40pF | Common-mode rejection ratio | 110dB or greater(at 1 kHz) | Input referred noise | 5nV /√Hz or lower(at 1 kHz) | Filter | LPF, HPF, BPF, automatic tuning is available. | Reference signal mode | EXT F/2F, INT F/2F | Internal oscillator | 0.5Hz to 120kHz | Measurement display | 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 | Monitoring meter | Acosφ and Asinφ | Time constant | 1ms to 30s, 6dB/oct or 12dB/oct | Averaging functions | Linear or exponential averaging mode
No. of averages : 21 to 29 | Interface | GPIB, RS-232C | Power requirements | AC100, 120, 220 or 240V switchable | Dimensions(mm) | 432(W) X 132.5(H) X 500(D) | Weight | approx.13.5kg |
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