| 鎖相放大器是一種檢測(cè)淹沒(méi)在噪聲中的重復(fù)信號(hào)(交流)的測(cè)量?jī)x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(jìn)行測(cè)量時(shí),除了一些特殊情況,都需要參照信號(hào)。一般情況下,直接把測(cè)量用的信號(hào)源連接到參照信號(hào)輸入端。
 它廣泛地應(yīng)用在分光分析等物理化學(xué)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 modeNo. 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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