Low current noise down to 100fA/√Hz

Ultra-low noise from input stage JFETs

Multi-step precision input impedance

DC-100 MHz gain bandwidth

Independent synchronized 2-channel design

Differential inputs for better signal integrity

Product Description

The OE4101 is a transimpedance current pre-amplifier that utilizes a negative feedback structure to convert input current to voltage using a feedback resistor and to control amplification.

The OE4102 detects current by measuring the voltage drop across a resistor on the input current channel, amplifies and outputs a voltage signal proportional to the measured current.

OE4102 High Frequency Dual Channel Current Pre-amplifier

100fAV/√Hz Input Current Noise

10V/A,100V/A,1kV/A,10kV/A,100kV/A,1MV/A Current Gain

1,10 voltage gain

Single-ended or differential inputs

Principle Block Diagram.

50mHz to 120kHz frequency

Low-noise current and voltage inputs

1 nV to 1 V full-scale sensitivity

1us to 3ks time constants

>120 dB dynamic reserve

Command compatible with SR830

Best price/performance ratio

Input Channel

OE1201 detects an input signal in a single-ended mode or a differential voltage mode. With an ultra low-noise pre-amplifier, the input noise is as low as 9 nV/√Hz@997 Hz. The input impedance is 10 MΩ and the full-scale input voltage sensitivity ranges from 1 nV to 1 V. Besides, OE1201 can be used for current measurement with gains of 106 or 108 V/A. Two line filters (50/60 Hz and 100/120 Hz) are designed to eliminate power frequency interference. A programmable gain amplifier is used to adjust the dynamic reserve of the system, so that OE1201 can keep a high dynamic reserve of 120 dB.

Reference Channel

The reference signal can work in external mode or internal mode. In internal mode, a precise and stable internal oscillator generates sine wave as an internal reference that is multiplied by the input signal. This internal signal is without any phase noise. With the digital phase-shifting technique, the phase resolution of the reference signal is 0.01 deg. OE1201 can work at any fixed frequency from 50 mHz to 120 kHz in this mode. In external mode, the reference signal can be a sine wave or a TTL pulse or a square wave. The rising or falling edge of the external reference signal triggers the Phase Lock Loop (PLL) to lock the external signal. Based on the frequency of the reference signal, the OE1201 can detect the harmonics of the input signal. The maximum harmonic signal frequency can reach 32,767 times the fundamental frequency, and the maximum harmonic frequency cannot exceed the maximum operating frequency of the instrument by 120 kHz.

Display

OE1201 has a 3.5-inch 320 x 240 color TFT-LCD. The measurement results of OE1201, such as X, Y, R, and θ, are shown in numerical form.

introducation of oe1201 lock in amplifier

Internal Oscillator

The internal oscillator of OE1201 generates a low distortion (–80 dBc) sine reference signal varying from 50 mHz to 120 kHz, which has a high frequency resolution of 1 mHz. The frequency and amplitude of the reference signal can be set by using the front panel of OE1201 or communication interface. When OE1201 is set in the external reference mode, the internal reference signal is phase-locked with the external reference signal.

introducation of oe1201 lock in amplifier

Signal Generator

OE1201 uses a high precision digital-to-analog converter (DAC) to output a sine wave signal at the same frequency as the internal reference signal. The amplitude and phase of the output sine wave can be set through the OE1201's display, where the maximum amplitude of the sine wave is 1 Vrms.

Manual Operation

All functions of OE1201 can be selected through the knobs and left and right keys on the interface, and the parameters of the response can be set directly through the Settings button in the right bar.  This instrument is equipped with the corresponding free LabVIEW program, which can effectively use all the test functions of OE1201, including setting the reasonable control parameters of the instrument and reading and saving the measured data of the instrument. This makes OE1201 easy to use in complex scientific experiments. On the LabVIEW interface, users can see all control commands and instrument feedback responses.

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Multi-Channel Lock-in Amplifier

Number of Channels 3 to 10 Available

Multi-Channel Lock-in Amplifier

DC to 100kHz/500kHz/1 MHz

5nV/√Hz  input noise

Number of channels: 3-10 (Optional)

Up to 8 demodulators

>130 dB dynamic reserve

1nV to 5V full-scale sensitivity

Scope, Spectrum Analyze

Now price of multi lock in amplifier is reasonable, anything you need, please contact us.