Description
|
SR124 and SR2124 Specs |
|
| 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 |
| Notch | Up to 80 dB attenuation |
| CMRR | 100 dB at 10 kHz, 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 |
| 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 |
| Time constants | 1ms to 300 s (6 or 12 dB/oct rolloff). Minimum time position, typically 500 µs, is determined by stray capacitance. ±10% (to 200 kHz) |
| 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 1mHz, whichever is greater |
| Amplitude | 1µV to 20 Vpp into 10 kΩ, 50 Ω output impedance. |
| Amplitude stability | 50 ppm/°C |
| VCO | |
| VCO input | A 0 to 10 V signal corresponds to the beginning and ending frequencies in the range set on the front panel. |
| Displays | |
| Panel meter | Center-zero, mirror-backed (a single meter for SR124, two meters for SR2124) |
| Offset | Output can be offset up to ±1000% of full scale |
| Reference | 3½-digit LED display |
| 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 |
| Ref. Out | Analog output. Sine or square wave, up to ±20 Vpp |
| Remote preamp | Provides power to the optional SR550, SR552 and SR554 preamps |
| Fiber optic interface | Connection for SX199 Remote Computer Interface Unit. The SX199 has GPIB (IEEE-488.2), RS-232, and Ethernet interfaces for remotely controlling the SR124. |
| RS-232 interface | RS-232 interface is standard. All instrument functions can be controlled and read through the interface. |
| Quadrant outputs | Four phase-shifted outputs at 0°, 90°, 180° and 270° from the reference. Output levels are 1Vrms sinewaves. |
| General | |
| Power | 40 W, 100/120/220/240 VAC, 50/60 Hz |
| Dimensions | 17″ × 5.25″ × 19.5″ (WHD) |
| Weight | 23 lbs. |
| Warranty | One year parts and labor on defects in materials and workmanship |
