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。
| 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 | | |
