• 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

Special features in brief

• Digital 4-channel LockIn amplifier between 3 mHz and 250 kHz with reference output
     and reference input (1^st to 15^th 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 0°C 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)