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MLIDA, Rev A
3.1.6
Auto Functions
Auto-functions allow parameters that are frequently adjusted allowing automatic setting by the
instrument. Gain, phase, offset and dynamic reserve are each quickly optimized with a single key
press. The offset and expand features are useful when examining small fluctuations in a
measurement. The input signal is quickly nulled with the auto-offset function, and resolution is
increased by expanding around the relative value by up to 100×. Harmonic detection is no longer
limited to only the 2F component. Any harmonic (2F, 3F, ... nF) up to 102 kHz can now be
measured without changing the reference frequency.
3.1.7
Analog Inputs and Outputs
The SR810 has user-defined output for measuring X, R, X-noise, Aux1, Aux 2, or the ratio of the
input signal to an external voltage. The SR810 has X and Y analog outputs (rear panel) that are
updated at 256 kHz. Four auxiliary inputs (16-bit ADCs) are provided for general purpose use,
such as normalizing the input to source intensity fluctuations. Four programmable outputs (16-bit
DACs) provide voltages from -10.5 V to +10.5 V and can be set via the front panel or computer
interfaces.
3.1.8
Internal Memory
The SR810 Lock-In has an 8,000 point memory buffer for recording the time history of a
measurement at rates up to 512 samples/s. Data transfers from the buffers using the computer
interfaces. A trigger input provides externally synchronized data recording.
3.1.9
Easy Operation
The SR810 Lock-In Amplifier is simple to use. All instrument functions are set from the front-
panel keypad, and a spin knob is provided to quickly adjust parameters. Up to nine different
instrument configurations can be stored in non-volatile RAM for fast and easy instrument set-up.
Standard RS-232 and GPIB (IEEE-488.2) interfaces allow communication with computers. All
functions can be controlled and read through these interfaces.
