The Sr810 Functional Diagram - Stanford Research Systems SR810 Manual

SR810 Basics
THE FUNCTIONAL SR810
The functional block diagram of the SR810 DSP
Lock-In Amplifier is shown below. The functions in
the gray area are handled by the digital signal
Low Noise
Differential
Amp
A
Voltage
B
Current
I
Reference In
Sine or TTL
Discriminator
50/60 Hz 100/120 Hz
Notch Notch
Filter Filter
90˚
Phase
Shift
Phase
PLL
Shifter
Phase Internal
Locked Oscillator
Loop
3-4
processor (DSP). We'll discuss the DSP aspects
of the SR810 as they come up in each functional
block description.
Gain
Low
Pass
Filter
Phase
Sensitive
Detector
Low
Pass
Filter
Phase
Sensitive
Detector
Discriminator
DC Gain
Offset
Expand
Y Out
R
R and
Θ Calc
Θ
X Out
DC Gain
Offset
Expand
Sine Out
TTL Out