Stanford Research Systems SR124, Operation And Service Manual

Page: 44 / 85

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