1MHz Low Noise Voltage Preamplifier PA560 3nV/√Hz Input Noise

PA560 voltage preamplifier

3 nV/√ Hz input noise (typical value)

1MHz maximum bandwidth

1/f noise low corner frequency: 10Hz

Variable gain range: 1 to 50000 (1-2-5 mode)

AC or DC coupling

Two configurable bandwidth filters (low-pass/high pass)

Differential or single ended input

External power supply or battery power supply

PA560 is a high-performance and low noise voltage preamplifier used to amplify low-frequency weak signals, and can be configured with different bandwidths and gains. It is suitable for a wide range of applications including low-temperature measurement, chip low-frequency noise measurement, sensor detection, optoelectronic detection, audio and vibration engineering.

The instrument can be used alone or in combination with instruments such as oscilloscopes, lock-in amplifiers, dynamic signal analyzers, etc.

Input

The PA560 has a true differential input mode, with an input noise spectral density of 3nV/√ Hz (50 ohm short circuit) and an input impedance of 100M Ω. The input of PA560 is completely grounded (BNC shielding is not connected to the chassis ground). The input offset voltage can be reset to zero through the front panel potentiometer, which can be operated using a small screwdriver.

Output

Two isolated output BNC connectors provide 600Q or 50Q output impedance. Both can output a maximum signal of 10 Vpp to drive the loads of their respective stages.

Filter

The PA560 includes two programmable first-order RC filters, which can be set in five filter modes through different combinations: LPF (6dB/oct), BPF (6dB/oct), HPF (6dB/oct), LPF (12dB/oct), and HPF (12dB/oct). The filter mode and cutoff frequency can be set through the front panel. The frequency range ranges from 0.03Hz to 1MHz, increasing in steps in a 1-3 sequence (e.g. 3Hz, 10Hz, 30Hz, 100Hz...)

Gain

The gain can be set in the 1-2-5 sequence, ranging from 1 to 50000. There are two gain modes to choose from. The low noise mode allocates gain before the filter to optimize noise performance, while the high reserve mode allocates gain after the filter to reduce sensitivity to signal overload.