Sciencetech IR detectors and optical choppers are designed to work with Stanford Research Systems Lock-in amplifiers. This option includes the lock-in amplifier, all interconnecting cables to Sciencetech detector and chopper, and Sciencetech IR detector operating software.
Sciencetech SPS-300 Terahertz Spectrometer requires a two phase lock-in amplifier for its detectors when uses in polarizing Martin Puplett mode.
100 dB of true dynamic reserve without the need for input pre-filtering. Time constants from 10 ms to 30 ks with 6, 12, 18 and 24 dB/octave filter rolloff. Includes a precision synthesized reference source with 25 ppm frequency accuracy and <-80 dBc distortion. Two data displays, allowing the simultaneous display of X and Y, or R and θ. RS-232 and GPIB interfaces capable of reading and setting all instrument functions.
Advantage of Digital Lock-in Amplifiers
Conventional lock-in amplifiers use an analog demodulator to mix an input signal with a reference signal. Dynamic reserve is limited to about 60 dB, and these instruments suffer from poor stability, output drift, and excessive gain and phase error. Demodulation in the LIA-830 is accomplished by sampling the input signal with a high-precision A/D converter and multiplying the digitized input by a synthesized reference signal. This digital demodulation technique results in more than 100 dB of true dynamic reserve (no prefiltering) and is free of the errors associated with analog instruments.
Use with Sciencetech SPS-300 Terahertz Spectrometer
Sciencetech SPS-300 requires a lock-in amplifier to increase the signal to noise ratio of its pyro-electric, DTGS, or helium cooled bolometer detectors. In polarizing Martin Puplett mode, this two phase lock-in amplifier is required.
Specifications:

• Low noise current and voltage inputs
  • 6 nV/Hz at 1 kHz (typical)
  • 0.13 pA/Hz at 1 kHz (106 V/A)
  • 0.013 pA/Hz at 100 Hz (108 V/A)
• Frequency range : 0.001 Hz to 102 kHz
• Sensitivity 2nV (for 1 V output)
• Dynamic reserve >100 dB without prefilters (<5 ppm/°C)
• A/D inputs & D/A outputs : 4BNC inputs, 16 bit; 4 BNC outputs, 16 bit
• GPIB and RS-232 interfaces
• Dimensions 17" ´ 5.25" ´ 19.5" (WHL)
• Weight 23 lbs