• 1 mHz to 500 kHz
• Low noise voltage and current inputs
• 1 µs to 30 ks time constants
• High bandwidth outputs
• Touchscreen data display - large numeric results, chart recordings & FFT displays
• 10 MHz timebase input and output
• GPIB, RS-232, Ethernet and USB
• HDMI video output

• 1 mHz to 4 MHz
• Low noise voltage and current inputs
• 1 µs to 30 ks time constants
• High bandwidth outputs
• Touchscreen data display - large numeric results, chart recordings, & FFT displays
• 10 MHz timebase input and output
• GPIB, RS-232, Ethernet and USB
• HDMI video output

• 1 mHz to 102 kHz frequency range 
• Magnitude & phase display
• 100 dB dynamic reserve without pre-filtering 
• Auto-gain, phase and reserve 
• Time constants from 10 µs to 30 ks 
• 6, 12, 18, 24 dB/oct rolloff 
• Harmonic detection (2F, 3F, ..., nF) 
• Standard GPIB and RS-232 interfaces

• 25 kHz to 200 MHz frequency range
• >80 dB dynamic reserve
• Time constants from 100 µs to 30 ks (6, 12, 18 or 24 dB/oct rolloff)
• "No Time Constant" mode (10 to 20 µs update rate)
• Auto-gain, -phase, -reserve and -offset
• Internal or external reference
• Two 16-bit DACs and ADCs
• GPIB and RS-232 interfaces

• 1 mHz to 102.4 kHz frequency range
• >100 dB dynamic reserve
• 0.001 degree phase resolution
• Time constants from 10 µs to 30 ks (up to 24 dB/oct rolloff)
• Auto-gain, -phase, -reserve and -offsets
• Data logging (up to 65k samples)
• Smoothing, curve fitting & statistic
• GPIB, RS-232 and USB storage

• 0.2 Hz to 200 kHz measurement range
• Low noise, all analog design
• No digital interference
• Low noise current and voltage inputs
• Harmonic detection (f, 2f, or 3f)
• Selectable input filtering

To expand their range SRS is proud to add the SR124 Single-Phase and SR2124 Dual Phase Analogue Lock-In Amplifiers. Inspired by the best of the earlier generation’s lock-ins, but availing itself of today’s low-noise analogue components and design methodologies, the SR124 and SR2124 are the best in low-noise, high performance analogue instrumentation.  

The SX199 Optical Interface Controller is a communications bridge to connect up to four SR124 analog lock-in amplifiers or CS580 current sources with a serial optical interface to a computer's' remote interface via GPIB, ethernet, or RS-232.

• 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

• 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