Anfatec Instruments AG
Measurement Science and Technology &
Scanning Probe Microscopy

eLockIn203

- digital quad-phase "DSP" Lock-In Amplifier -


Manual of the eLockIn203 (PDF, 2.8 MB)
LockInRemote (1 MB) - last update: November 2010

The eLockIn203 lockin amplifier is "the little brother" of the eLockIn204. It has several parameters
and features which are only found in these  Anfatec instruments.
The most unique are:
  • input sampling rate of 40 MHz (fully digital design, 1 MHz bandwidth)
  • real quad-channel amplification in the full frequency range
  • 4 channel output data rate of 156 kHz
  • dual input/dual harmonic mode in the full frequency range
  • on-screen 4-channel spectra acquisition
  • web-interface for external communication

The eLockIn203 can be used as spectrum analyser, as oscilloscope, as sinus generator or as
measurement control system. It provides 8 A/D channels as external inputs and controls
8 D/A channels with 156 kHz update rate as external signal outputs. It can store 32 MByte data,
provides modern network connection and USB connection.

Moreover, it acts as web server and all data are available over the internet.

General

Dynamic Reserve > 135 dB
Input coupling ac or dc // A, A-B, A&B
Remote control Ethernet
integrated Oscillator 10 mHz ... > 250 kHz (3 mHz resolution)
Noise @100 kHz < 6  (typ. 5) nVrms/Hz 0.5 
Time constants 100 s... 1 ks
Sensivity ranges 10 nV ... 10 V
Phase resolution 0.001 deg
Frequency stability @ 10 kHz 50 mHz/year (@ 20 C +/- 3 C)

Special features in brief

  • Digital 4-channel LockIn amplifier between 3 mHz and 250 kHz with reference output
       and reference input (1st to 15th harmonic) with approximately 40 kHz update rate
  • spectrum analyzer
  • analogue output of 4 channels with 156 kHz sampling rate
  • 4 channel oscilloscope (4 out of 4 LockIn channels and 8 external channels)
  • measurement system with 8 AUX-In and 8 AUX-Out with 24 bit resolution and 160 kHz update rate
  • USB and Network connection, parallel and serial port
  • 32 MB data space
  • Webserver for web access of all data
  • reference input with less than10 degree phase deviation (over the full frequency range)


Specification of the LockIn amplifier

Signal Input
Voltage Input BNC
Input Impedance 1 MOhm || 12 pF
Damage Threshold > +/- 12 V
Bandwidth dc to 250 kHz (f3dB>250 kHz) 


Full Scale Input Ranges 5 V (high dynamic reserve)
500 mV (normal)
50 mV (low noise)


Full Scale Sensitivities 10 nV, 20 nV, 50 nV, ...
logarithmic till 10 V


Typical Input Noise
      @ 100 kHz, high dynamic < 300
      @ 100 kHz, normal dynamic < 50
      @ 100 kHz, low dynamic < 6
RollOff 6 dB/oct, 12 dB/oct, 24 dB/oct
Time Constants 0,1 ms ... 1 ks
Gain deviations between dynamic ranges: < 1%
Gain deviations between different time constants: < 1%
Reference Output
Internal Oscillator 10 mHz .. > 250 kHz
Frequency Resolution < 3 mHz
Frequency Accuracy +/- 50 ppm from 0C to 70 C
Reference Output Voltage < 1 mVpp ... max. 15 Vpp
Output Noise @ 100 kHz for 1 mVrms output < 200
Reference Input
Frequency range 1 Hz to 250 kHz
Locking time < 10 periods + 100 ms
Phase error < 4 degree (@ f = 1 kHz)

Main screen
of the lockin display

main LockIn screen
                                               
Measurement screen

Measurement screen

Oscillloscope screen

oscilloscope screen