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3 – 2
3.1 Sensitivity and gain
3.1.1 AC Gain
High Res.
100 nV
200 nV
500 nV
1 V
2 V
5 V
10 V
20 V
50 V
100 V
200 V
500 V
1 mV
2 mV
5 mV
10 mV
20 mV
50 mV
100 mV
200 mV
500 mV
While not necessary to operate the SR124, many users will still find
detailed information about gain allocation helpful for optimizing
measurements.
Sensitivity
Normal
Low Noise
100 nV
200 nV
500 nV
100 nV
1 V
200 nV
2 V
500 nV
5 V
1 V
10 V
2 V
20 V
5 V
50 V
10 V
100 V
20 V
200 V
50 V
500 V
100 V
1 mV
200 V
2 mV
500 V
5 mV
1 mV
10 mV
2 mV
20 mV
5 mV
50 mV
10 mV
100 mV
20 mV
200 mV
50 mV
500 mV
100 mV
200 mV
500 mV
Programmable gain stages are located throughout the SR124, in both
the AC and DC signal paths. While the actual gain elements can be
Table 3.1: AC gain allocation
Pre-
Post-
Mixer
gain
gain
gain
500
100
10
500
50
10
500
20
10
500
100
10
500
50
10
500
20
10
500
10
10
500
5
10
500
2
10
500
1
10
500
0.5
10
500
0.2
10
500
1
1
500
0.5
1
500
0.2
1
50
1
1
50
0.5
1
50
0.2
1
5
1
1
5
0.5
1
5
0.2
1
5
1
1
5
0.5
1
5
0.2
1
5
1
1
5
0.5
1
5
0.2
1
SR124 Analog Lock-In Amplifier
Performance Details
Sig. Mon.
Total
gain
AC gain
4
5
5
10
5
10
4
5
2 5
10
2 5
10
4
5
1 0
10
1 0
10
4
5
5
10
5
10
4
5
2 5
10
2 5
10
4
5
1 0
10
1 0
10
3
4
5
10
5
10
3
4
2 5
10
2 5
10
3
4
1
10
1
10
2
3
5
10
5
10
2
3
2 5
10
2 5
10
2
3
1
10
1
10
2
2
5
10
5
10
2
2
2 5
10
2 5
10
2
2
1
10
1
10
1
1
5
10
5
10
1
1
2 5
10
2 5
10
1
1
1
10
1
10
5
5
2.5
2.5
1
1
5
5
2.5
2.5
1
1
5
5
2.5
2.5
1
1
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