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Signal Channel:
Voltage inputs: Single-ended or differential
Sensitivity: 100 nV to 500 mV
Current input: 106 or 108 V/A
Input impedance:
Voltage: 10 MΩ+ 35 pF, AC or DC coupled
Current input: 1 kΩ to virtual ground
Gain accuracy: ±1 %
Gain stability: 100 ppm/°C (flat mode, normal reserve)
Noise (rms):
2.5 nV/√Hz at 1kHz
0.14 pA/√Hz at 1 kHz (106 V/A)
0.014 pA/√Hz at 100 Hz (108 V/A)
Signal filters (Tuneable from 0.2 Hz to 200 kHz):
Flat: Flat response to within ±1 % from 10 Hz to 100 kHz, ±2 % from 100 kHz to 200 kHz, and ±10 % below 10 Hz.
Band pass: Bandwidth adjustable from 1 % to 100 % of center frequency (Q from 100 to 1).
High pass: –12 dB/oct rolloff
Low pass: –12 dB/oct rolloff
Reference Channel:
Frequency range: 0.2 Hz to 200 kHz
Reference input: TTL or sine (100 mVpp min.)
Input impedance: 1 MΩ
Phase resolution: 0.01°
Phase accuracy:
±1° (2 to 20 kHz),
±5° (20 kHz to 200 kHz)
Harmonic detection: F, 2F and 3F (ext. ref)
Demodulator:
Output stability:
Low noise: 20 ppm/°C
Normal: 100 ppm/°C
High reserve: 1000 ppm/°C
Internal Oscillator:
Range: 0.2 Hz to 200 kHz
Outputs: Sine, square. (When using an external reference, output is phase locked to the external reference.)
Frequency accuracy: 0.1%
Frequency resolution: 3½ digits or 1 mHz (whichever is greater)
Amplitude: 1 µV to 20 Vpp into 10 kΩ, 50 Ω output impedance.
Amplitude stability: 50 ppm/°C
Inputs and Outputs:
Lock-In/AC Volt: Instrument can be operated as a lock-in amplifier or as a frequency selective AC voltmeter.
Output:
Lock-in:
X (Rcosθ), ±10 V
Y (Rsinθ), ±10 V, SR2124 only
AC Volt: ±10 V
General:
Power: 40 W, 100/120/220/240 VAC, 50/60 Hz
Dimensions: 17" × 5.25" × 19.5" (WHD)
Weight: 23 lbs.
