锁相放大器的原理
锁定放大器本质上是一个频率选择交流电压表。它用于测量微弱信号（nV 范围），这些信号可能被比信号高得多的背景噪声所隐藏。测量过程也称为载频法或相敏检测。锁定放大器从大多数不需要的频率的混合中选择具有特定频率和相位的信号。
Model | LIA-MV-150-S Standard | LIA-MV-150-D | ||
Voltage Input | BNC connector | Lemo® connector | ||
Single-ended | True-differential | |||
Instrumentation amplifier | Instrumentation amplifier | |||
Noise 12 nV/√Hz | Noise 12 nV/√Hz | |||
Current Input | Lemo® connector | |||
Transimpedance amplifier, gain 1 kV/A | Transimpedance amplifier, gain 1 kV/A | |||
Noise 4 pA/√Hz | Noise 4 pA/√Hz | |||
Sensitivity | Voltage: 3 µV to 100 mV, switchable in 1-3-10 | |||
Current: 3 nA to 100 µA, switchable in 1-3-10 | ||||
Working Frequency | 10 Hz - 45 kHz | |||
Reference Input | ±100 mV to ±5 V, switchable to TTL | |||
Phase | Adjustable 0° - 360° (8-bit resolution), |
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