Stanford Research Systems SR124, Operation And Service Manual

Page: 10 / 85

viii General Information
Specifications
All performance specifications after 1 hour warm-up at 23
◦
C ± 2
◦
C
ambient.
Signal channel
Parameter Specification
Voltage inputs Single-ended or di
ff
erential
Sensitivity 100 nV to 500 mV, in 1-2-5 steps
Current input 10
6
V
/
A or 10
8
V
/
A
Input impedance
Voltage 10 M
Ω +
25 pF, AC or DC coupled
Current 100
Ω
(1 k
Ω
) to virtual ground,
10
6
(10
8
) V
/
A scale
Gain accurancy ± 1% at 1 kHz
Gain stability 100 ppm
/
◦
C
(flat mode, normal reserve)
Input noise, typ. 2.8 nV
/
√
Hz at 1 kHz
0.14 pA
/
√
Hz at 1 kHz (10
6
V
/
A)
0.014 pA
/
√
Hz at 100 Hz (10
8
V
/
A)
Input filter (Tunable from 2 Hz to 100 kHz)
Flat Flat within ± 1% from 10 Hz to 20 kHz
± 5% from 2 Hz to 100 kHz
Band pass Q of 1, 2, 5, 10, 20, 50, and 100
High pass − 12 dB
/
oct rollo
ff
Low pass − 12 dB
/
oct rollo
ff
Notch Up to 80 dB attenuation
CMRR 90 dB below 10 kHz, DC coupled
decreasing by 6 dB
/
oct above 10 kHz
Dynamic reserve (without band pass filter)
Low noise 20 dB
Normal 40 dB
High reserve 60 dB
SR124 Analog Lock-In Amplifier