3 – 8
Performance Details
10
-2
10
-1
10
0
10
1
10
2
-60
-50
-40
-30
-20
-10
0
10
Normalized frequency (f / f
0
)
Filt
er r
esponse (dB)
Low Pass
Q = 1
2
5
10
20
50
100
Figure 3.3: The SR124 low pass input filter gain
10
-0.3
10
-0.2
10
-0.1
10
0
10
0.1
10
0.2
10
0.3
-60
-50
-40
-30
-20
-10
0
10
Notch Filter
Normalized frequency (f/f
0
)
Filt
er r
esponse (dB)
Q = 1
2
5
10
100
Figure 3.4: The SR124 notch input filter gain
SR124
Analog Lock-In Amplifier