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430 and 441 Analogue OEM Lock-In Amplifiers

Features

 Scitec Instruments Model 430 and Model 441 are OEM analogue lock-in amplifiers. Both the single phase Model 430 and dual phase Model 441 are suitable for making amplitude and phase measurements but it is significantly easier with the Model 441. These pcb lock-in amplifiers offer a low cost solution to recovering noisy signals in many situations.

Single and dual phase versions

Differential or single-ended input

Sensitivities from 1 µV to 10 V for 1 V output

High performance wide bandwidth input gain stage

Low pass filter output time constants from 100 µs to 30 s

1F and 2F reference signal operation

90° step and fine phase control

Model 430

430 A single phase lock-in amplifier with manual setting, using jumpers, of input mode, sensitivity, low pass filter time constant and reference signal course phase control.

Sensitivity: 3 µV to 10 V in 1, 3, 10 steps for 1 V output (Gain settings of x0.1 to x330,000)

Reference input: TTL/CMOS with mark/space of 1:10 to 10:1 (triggered from rising edge only)

Power: -15 V, 0 V, +15 V and +5 V dc at 50 mA per supply rail.

Model 441

441 A dual phase lock-in amplifier with manual setting, using jumpers, of input mode, sensitivity, low pass filter time constant and reference signal course phase control. Can be used in either of the following three modes:

 Dual phase operation - one input signal with two demodulators operating 90° apart providing both X and Y (or real and imaginery) components of the input signal.

 R calculation - on board circuitry provides the modulus of the X and Y components.

 Single channel 1F and 2F operation - one input signal and two demodulators operating at 1x and 2x the reference frequency to measure the first and second harmonics of the input signal.

Sensitivity: 3 µV to 10 V in 1, 3, 10 steps for 1 V output (Gain settings of x0.1 to x330,000)

Reference input: TTL/CMOS with mark/space of 1:10 to 10:1 (triggered from rising edge only)

Power: -15 V, 0 V, +15 V and +5 V dc at 50 mA per supply rail.

 Please contact us for additional information.

Specifications

Input Signal Channels

 The input signal channel amplifies the input signal to a level suitable for the demodulator(s). High performance, low-noise, broad-band amplifiers are used throughout. The input circuits can accept differential or single-ended inputs via the input SMB connectors. Options within the unit allow the outer SMB contact or screen to act as a high impedance differential input or allow it to be connected to ground for single-ended operation.

Input: Differential or single ended voltage via SMB socket

Input Gain: x0.1 to x330 in 1, 3.3, 10 steps

Input Impedance: 10¹² // 1 nF, dc coupled

Frequency: 10 Hz to 100 kHz

Maximum Inputs: ±10 V before saturation occurs

Input Noise Voltage: Other lock-in amplifier manufacturers give input noise values but without providing any definition of this specification. Indeed there is no meaningful definition of this specification in relation to lock-in amplifiers. As such, Scitec Instruments does not provide noise values and other manufacturers data sheets are considered misleading. Further details about input noise are available on request

Gain Accuracy: 1%

Gain Stability: 200ppm/°C

Dynamic Reserve: 0dB to 80dB

Demodulator

 The input stage drives high bandwidth demodulators to recover the input signal.

Output

 The demodulator outputs are passed through low pass filters before being amplified for output.

Output Gain: x1, x10, x100, x1000

Low Pass Filter Time Constants: 100 µs to 30 s in 1, 3, 10 steps

Outputs - SMB connectors: +/-100 mV to +/-10 V full scale

Reference Channel

 A single reference channel is used to generate the signals that drive the demodulator(s). A fine phase shifting circuit allows the reference signal to be phase shifted from 0° to 150° relative to the signal input. A second circuit then produces signals that are phase shifted by 0°, 90°, 180° and 270° at both the reference frequency and twice the reference frequency.

Frequency: 10 Hz to 100 kHz

Trigger: Standard TTL, mark to space ratio in the range 20:1 to 1:20. Rising edge triggered.

Acquisition Time: 10 s max.

Phase Control: 90° steps + fine shift of 0° - 150°

Phase Drift: 0.1°/C

1F and 2F operation

General

Power connections are made via a 64 pin type C DIN41612 connector. Signal connections are not possible via this connector.

Mechanical: 100 x 160 mm

Temperature Range: 0 - 50°C

Warranty: 2 years from date of shipment

Phase Drift: 0.1°/C

1F and 2F operation

 Please contact us for additional information.

Ordering Information

Model 430

 Model 430 Lock-in Amplifier: Analogue single phase OEM lock-in amplifier. Does not include power supply.

Model 441

 Model 441 Lock-in Amplifier: Analogue dual phase OEM lock-in amplifier. Does not include power supply.

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