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home > Products > Measurement Instruments > Lock-in Amplifier/Preamplifier > Preamplifier > SA-400 Series
Selection Guide

Small signal measurement instruments

Low Noise Differential Amplifier
SA-400 series

World's top level differential amplifier with extremely low noise

  • Wide voltage range measurement
    (sub micro-Volt to milli-Volt)
  • Wide frequency range measurement
    (DC to 100MHz)
  • Covering the various signal source impedance.
SA-200F3

Signal from sensors Low frequency signal High frequency signal
Low impedance SA-410F3
DC to 1 MHz, Output 20 Vp-p
SA-430F5
1 kHz to 100 MHz, Output 2 Vp-p
High impedance SA-421F5
30 Hz to 30 MHz, Output 2 Vp-p
SA-420F5
1 kHz to 70 MHz, Output 2 Vp-p


Input voltage against frequency

SA-400 series:

Amplifies extremely small voltage such as sub micro-Volt.

入力範囲
 

World's top level amplifier with extremely low noise

The SA-400 series amplifies low and high frequency signals with low noise.

Equivalent input noise voltage density against Cut-off frequency

SA-400 series:

World's top level amplifier with low noise and wideband frequency (DC to 100 MHz).

遮断周波数
*June 16,2017

The SA-400 series covers various voltage-output sensors.

Both low input impedance models and high input impedance models realize extremely low noise.

Equivalent input noise voltage density against input impedance

SA-400 series:

Covers various signal source impedance.

入力インピーダンス
*June 16,2017
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Pulse response

Output waveforms ( Input: 100μVp-p square wave)

* Upper waveform: without LPF
   Lower waveform: with LPF (fc = 1 MHz)

SA-410F3

100Hz 1kHz 10kHz
SA製品画像 Zin=1k/ 10k/ 100kΩ,
G=40dB,
DC to 1MHz, 0.75nV/√Hz
100Hz 1kHz 10kHz
100kHz 1MHz 10MHz
100kHz 1MHz 10MHz

SA-420F5

100Hz 1kHz 10kHz
SA製品画像 Zin=1MΩ, G=46dB, 
1kHz to 70MHz,
0.9nV/√Hz
100Hz 1kHz 10kHz
100kHz 1MHz 10MHz
100k 1MHz 10MHz

SA-421F5

100Hz 1kHz 10kHz
SA製品画像 Zin=1MΩ,  G=46dB,
30Hz to 30MHz,
0.5nV/√Hz
100Hz 1kHz 10kHz
100kHz 1MHz 10MHz
100kHz 1MHz 10MHz

SA-430F5

100Hz 1kHz 10kHz
SA製品画像 Zin=50Ω,  G=46dB,
1kHz to 100MHz,
0.35nV/√Hz
100Hz 1kHz 10kHz
100kHz 1MHz 10MHz
100kHz 1MHz 10MHz

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Challenge to the small signal measurement
- Micro-Volt real-time signal measurement -

Displays amplified sine wave signals on oscilloscope(BW: 1 MHz) by the SA-410F3 (1-stage, 40dB gain).

    Successful in 5μVp-p real-time signal measurement

  Measurement condition: using the LPF whose cut-off frequency is approximately 5 times higher than the signal frequency.

55Hz,LPF=300Hz 55Hz
LPF=300Hz
550Hz LPF=3kHz 550Hz
LPF=3kHz
5.5kHz LPF=30kHz 5.5kHz
LPF=30kHz
55kHz LPF=300kHz 55kHz
LPF=300kHz

Without LPF

55kHz 55Hz 550Hz 550Hz 5.5kHz 5.5kHz 55kHz 55kHz

Displays amplified pulse wave signals on oscilloscope by the SA-410F3 (1-stages, 40 dB gain).

    Successful in 5μVp-p real-time signal measurement

  Measurement condition: using the LPF whose cut-off frequency is approximately 5 times higher than the signal frequency.

55Hz,LPF=300Hz 55Hz
LPF=300Hz
550Hz LPF=3kHz 550Hz
LPF=3kHz
5.5kHz LPF=30kHz 5.5kHz
LPF=30kHz
55kHz LPF=300kHz 55kHz
LPF=300kHz

Without LPF

55Hz 55Hz 550Hz 550Hz 5.5kHz 5.5kHz 55kHz 55kHz
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Challenge to the small signal measurement
- Repeated nano-Volt signal detection -

Displays amplified pulse wave signals on oscilloscope by the SA-410F3 (3-stages, 120 dB gain).

  Number of averaging by digital oscilloscope: 512

    Successful in 40 nVp-p repeated signal detection

Input: 40nVp-p, Pulse wave 55Hz,
LPF: 1kHz
Input: 40nVp-p pulse wave 550Hz,
LPF: 10kHz
50nV, 55Hz, Duty 10% 50nV, 550Hz, Duty 10%

  Number of averaging by digital oscilloscope: 10000

    Successful in 4 nVp-p repeated signal detection

Input: 4nVp-p pulse wave 55Hz,
LPF: 1kHz
Input: 8nVp-p pulse wave 55Hz,
LPF: 1kHz
5nV, 55Hz, Duty 10% 5nV, 550Hz, Duty 10%

  Measurement block diagram

測定系イメージ
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