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SRS SR530 Analogue Lock-in Amplifier, 100kHz

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Availability: Awaiting stock
Please allow up to two weeks for delivery

Excl. VAT: £3,167.00 Incl. VAT: £3,800.40
Product Code: 14976
Manufacturer: Stanford Research Systems

  • 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

Lambda Exclusive Promotion:
Additional 12 months warranty for free (2 years total) via our UK Service Centre.

The Stanford Research Systems SR510 and SR530 are analog lock-in amplifiers which can measure AC signals as small as nanovolts in the presence of much larger noise levels. Both the single phase SRS SR510 and the dual phase SR530 have low-noise voltage and current inputs, high dynamic reserve, two stages of time constants, and an internal oscillator. In addition, both lock-ins come equipped with a variety of features designed to make them simple to use.

Dynamic Reserve
The dynamic reserve of a lock-in amplifier at a given full-scale input voltage is the ratio (in dB) of the largest interfering signal to the full-scale input voltage. The largest interfering signal is defined as the amplitude of the largest signal at any frequency that can be applied to the input before the lock-in cannot measure a signal with its specified accuracy.

The SR510 and SR530 have a dynamic reserve of between 20 dB and 60 dB, depending on the sensitivity scale. Selecting the band pass filter adds an additional 20 dB of dynamic reserve, making the maximum dynamic reserve for these lock-ins 80 dB.

Offset and Expand
The SR510/SR530's offset and expand features make it easy to look at small changes in a large signal. Output offsets of 0 % to 100 % of full scale can be selected manually, or by using auto-offset, which automatically selects an offset equal to the signal value. Once the signal is offset, a 10× expand is available to provide increased resolution when looking at small changes from a nominal value.

Analog and Digital Displays
Precision analog meters and 4-digit digital displays are standard on both lock-ins. On the SR510, you can select displays of the signal amplitude, the signal offset, or the measured noise. On the SR530, the first pair of displays show the signal components in rectangular form (X and Y), polar form (R and Θ), the offset, noise, or the value of the rear-panel D/A outputs. The other digital display on both lock-ins can be configured to show either the reference phase or the reference frequency.

Noise Measurement
The SR510/SR530's noise measurement feature lets you directly measure the noise in your signal at the reference frequency. Noise is defined as the rms deviation of the signal from its mean. The SR510/SR530 will report the value of the noise in both a 1 Hz and 10 Hz bandwidth around the reference frequency.

Internal Oscillator
An internal voltage-controlled oscillator provides both an adjustable-amplitude sine wave output and a synchronous, fixed-amplitude reference output. The sine wave amplitude can be set to 0.01, 0.1, or 1 Vrms, and can drive up to 20 mA. The oscillator frequency is controlled by a rear-panel voltage input and can be adjusted between 1 Hz and 100 kHz. Typically, the sine wave output is used to excite some aspect of an experiment, while the reference output provides a frequency reference to the lock-in.

A/Ds and D/As
There are four A/Ds and two D/As on the rear panel that provide flexibility in interfacing the SR510/SR530 with external signals. These input/output ports measure and supply analog voltages with a range of ±10.24 VDC and a resolution of 2.5 mV. The A/Ds digitize signals at a rate of 1 kHz. The D/A output is ideal for controlling the frequency of the SR510/530's internal voltage-controlled oscillator. A built-in ratio feature allows the SR510/SR530 to calculate the ratio of its output to a signal at one of the A/D ports. This feature is important in servo applications to maintain a constant loop gain, or in experiments that normalize a signal to an intensity level.

Available Preamplifiers
Although the SR510 and SR530 are completely self contained and require no preamplification, sometimes an external preamplifier can be useful. Remote preamplifiers provide gain where it's most important— right at the detector, before the signal-to-noise ratio is permanently degraded by cable noise and pickup. The SR550 FET-input preamplifier, the SR552 bipolar-input preamplifier, and the SR554 transformer-input preamplifier are ideally suited for use with the SR510/SR530 lock-ins. These preamplifiers are especially useful when measuring extremely low-level signals.

Computer Interfaces
An RS-232 computer interface is standard on both the SR510 and SR530. An optional GPIB interface is also available. All features of the instruments can be queried and set via the computer interfaces.

Additional Information

Signal Channel 
Voltage Single-ended or differential
Current 106 V/A
Voltage 100 MΩ + 25 pF, AC coupled
Current 1 kΩ to virtual ground
Full-scale sensitivity:
Voltage 100 nV to 500 mV
Current 100 fA to 0.5 µA
Maximum inputs:
Voltage 100 VDC, 10 VAC damage threshold, 2 Vpp saturation
Current 10 µA damage threshold, 1 µApp saturation
Voltage 7 nV/√Hz at 1 kHz (typ.)
Current 0.13 pA/√Hz at 1 kHz (typ.)
Common Mode:
Range 1 Vp
Rejection 100 dB (DC to 1 kHz, degrades by 6 dB/oct above 1 kHz)
Gain accuracy 1 % (2 Hz to 100 kHz)
Gain stability 200 ppm/°C
Signal filters 60 Hz notch, -50 dB (Q=10, adjustable from 45 to 65 Hz)
120 Hz notch, -50 dB (Q=10, adjustable from 100 to 130 Hz)
Tracking band pass (Q=5). Filter adds 20 dB to dynamic reserve
Dynamic reserve LOW (20 dB), 5 ppm/°C (1 µV to 500 mV sensitivity)
NORM (40 dB), 50 ppm/°C (100 nV to 50 mV sensitivity)
HIGH (60 dB), 500 ppm/°C (100 nV to 5 mV sensitivity)
Reference Channel
Frequency 0.5 Hz to 100 kHz
Input impedance 1 MΩ, AC coupled
Sine 100 mV minimum, 1 Vrms nominal
Pulse ±1 V, 1 µs minimum width
Mode Fundamental or 2nd harmonic (2f)
Acquisition time 25 s (1 Hz ref.), 6 s (10 Hz ref.), 2 s (10 kHz ref.)
Slew rate 1 decade per 10 s at 1 kHz
Phase control 90° shifts, fine shifts in 0.025° steps
Phase noise 0.01° rms at 1 kHz (100 ms, 12 dB/oct rolloff time constant)
Phase drift 0.1°/°C
Phase error Less than 1° above 10 Hz
Orthogonality* 90° ± 1°
Stability 5 ppm/°C (LOW dynamic reserve)
50 ppm/°C (NORM dynamic reserve)
500 ppm/°C (HIGH dynamic reserve)
Time constants:
Pre 1 ms to 100 s (6 dB/octave)
Post 1 s, 0.1 s, none (6 dB/octave)
Offset Up to 1× full scale (10× on expand)
Harmonic rejection 55 dB (band pass filter in)
Outputs and Interfaces
Channel 1 output X (RcosΘ), X Offset, X Noise, R*, R Offset*, X5 (ext. D/A)*
Channel 2 outputs* Y (RsinΘ), Y offset, Θ, Y noise, X6 (ext. D/A)
Output meters 2 % precision analog meter
Output LCD 4-digit LCD display shows same value as the analog meter.
Output BNC ±10 V corresponds to full scale input (
X output* X (RcosΘ), ±10 V,
Y output* Y (RsinΘ), ±10 V,
Reference LCD 4-digit LCD display for reference phase shift or frequency
X1 to X4 4 analog inputs, 13-bit, ±10.24 V
X5, X6 2 analog outputs, 13-bit, ±10.24 V
Ratio Ratio output equals 10× signal output divided by the denominator of the input.
Internal oscillator:
Range 1 Hz to 100 kHz
Accuracy 1 %
Stability 150 ppm/°C (frequency), 500 ppm/°C (amplitude)
Distortion 2 % THD
Amplitude 10 mVrms, 100 mVrms, 1 Vrms
Computer interfaces RS-232 standard, GPIB optional. All instrument functions can be controlled and read through the interfaces.
Power 35 W, 100/120/220/240 VAC, 50/60 Hz
Dimensions (SR510) 17" × 3.5" × 17" (WHL)
(SR530) 17" × 5.25" × 17" (WHL)
Weight 12 lbs. (SR510), 16 lbs. (SR530)
Warranty One year parts and labor on defects in materials and workmanship

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