Description:
STANFORD RESEARCH SR530 LOCK-IN AMPLIFIER DUAL PHASE
    *Stanford Research Systems SRS Dual Phase Lock-In-Amplifier 
    *Model SR530 
    *With Option - 1 IEEE-488 GPIB and RS-232 Interface Connectors
    *With a new Power Cord
    *Stanford Research Systems SR530 Features :
      0.5 Hz to 100 kHz frequency range
      Current and voltage inputs
      Up to 80 dB dynamic reserve
      Tracking band-pass and line filters
      Internal reference oscillator
      Four ADC inputs, two DAC outputs
      GPIB and RS-232 interfaces