SE2031 DSP Lock-In Amplifier

SE2031 Digital Lock-in Amplifier provides an excellent performance within its bandwidth from 1 mHz to 3 MHz. With the advantage of the latest digital signal processing technology and high- speed 16-bit ADC, SE2031 can easily detect the phase and the magnitude of weak signals overwhelmed by various large noise. The performance of SE2031 is as good as other lock-in amplifiers brands, even better in some certain parameters, such as measurement accuracy, SNR, dynamic reserve. Otherwise, SE2031 integrates some special functions like multiple harmonic measurement, which meets the needs of scientific research and industrial application well.

Key Features

1 mHz to 3 MHz frequency range

1 nV to 1 V full-scale sensitivity

Time constants from 10 µs to 3 ks

> 100 dB dynamic reserve

Automatic adjustment

Multiple-harmonic measurement

5.6 inch color TFT-LCD screen, single or dual display

Support remote control, embedded a free LabVIEW program

1. Signal Channel
Voltage Input Mode

Single-ended or Differential

Full-scale Sensitivity

1 nV to 1 V in a 1-2-5 sequence

1 fA to 1 µA

Current Input

106 or 108 V/A

Impedance

•  Voltage: 10 MΩ // 25 pF, AC or DC coupled

•  Current: 1 kΩ to virtual ground

C.M.R.R

> 100 dB to 10 kHz, decreasing by 6 dB/oct

Dynamic Reserve

> 100 dB

Gain Accuracy

0.2% typ, 1% max

Voltage Noise

3 nV/√Hz at 997 Hz

Current Noise

•  7 fA/√Hz at 97 Hz

•  10 fA/√Hz at 997 Hz

Line Filters

50/60 Hz and 100/120 Hz

Gounding

BNC shield can be grounded or floated via 1 kΩ to ground

2. Reference Channel
Input

•  Frequency range:  1 mHz to 3 MHz

•  Reference input: TTL or Sine

•  Input impedance: 1 MΩ//25 pF

Phase

•  Resolution: 0.01°

•  Absolute phase error: < 1°

•  Relative phase error: < 0.01°

•  Orthogonality: 90° ± 0.001°

•  Phase noise: (Internal ref.) Synthesized, <0.0001°rms at 1 kHz;  (External ref.) 0.005°rms at 1 kHz (100 ms time constant, 12 dB/oct)

•  Drift: <0.01°/℃ below 10 kHz, <0.1°/℃ above 10 kHz

Harmonic Detection

2F, 3F, …nF to 3 MHz  (n<32767)

Acquisition Time

•  Internal ref.: instantaneous acquisition

•  External ref.: (2 cycles + 5 ms) or 40 ms, whichever is larger

3. Demodulator
Stability

•  Digital output: no zero drift on all setting

•  Display: no zero drift on all setting

•  Analog output: <5 ppm/℃ for all dynamic reserve settings

Harmonic Rejection

-90 dB

Time Constant

•  10 µs to 3 ks (<200 Hz)

•  10 µs to 30 s (>200 Hz)

(6, 12, 18, 24 dB/oct rolloff)

Synchronous Filters

Available below 200 Hz (18, 24 dB/oct rolloff)

4. Internal Oscillator
Frequency

•  Range: 1 mHz to 3 MHz

•  Accuracy: 2 ppm + 10 µHz

•  Resolution: 1 mHz

Distortion

•  -80 dBc (f < 10 kHz)

•  -70 dBc (f > 10 kHz)

Amplitude

0.001 to 10 Vpp

Accuracy

1%

Stability

50 ppm/℃

Output

Sine output on rear panel, and TTL sync output on rear panel

5. Interface

USB2.0 and RS-232 interface

6. Outputs
CH1 and CH2 Outputs

•  Function: output X, Y, R, θ

•  Output voltage: ±10 V full scale, 30 mA max output current

7. Display
Screen

5.6 inch, 640×480 TFT

Screen Format

Single or dual display

Display Quantities

Each display shows one trace, traces can be defined as X,Y,R,θ

Display Types

Large numeric readout, bar graph, polar plot and strip chart

8. General
Power Requirement

•  Voltage: 220 – 240 VAC, 100 – 120 VAC (optional)

•  Frequency: 50/60 Hz

•  Power: 40 W

Dimension

•  473 (W) × 160 (H) × 490 (D) mm  (with feet)

•  473 (W) × 147 (H) × 490 (D) mm  (without feet)

Weight

12 kg

Main Machine

Module No. Item Description
SE2031 Digital Lock-in Amplifier 1 mHz to 3 MHz, 1 nV to 1 V full-scale sensitivity

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