Stanford Research Systems SR844 Lock-In Amplifier
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Stanford Research Systems SR844 is a wideband lock-in amplifier with 25 kHz to 200 MHz range, up to 80 dB dynamic reserve, and dual 50 Ω/1 MΩ inputs.
Product details
| Model | SR844 |
| Manufacturer | Stanford Research Systems |
| Category | RF Amplifiers |
| Availability | Made to order |
Description
Overview
The Stanford Research Systems SR844 is a wideband lock-in amplifier designed for high-frequency RF applications. It features one of the widest bandwidths available in lock-in amplifiers, operating from 25 kHz to 200 MHz with up to 80 dB of drift-free dynamic reserve. The SR844 incorporates advanced DSP technology, providing high dynamic reserve, low zero-drift, accurate RF phase shifts, and precise orthogonality.
Key Features
- Frequency range: 25 kHz to 200 MHz
- Dynamic reserve: Up to 80 dB
- Dual input impedances: 50 Ω (for RF matching) and 1 MΩ (for high source impedance)
- Full-scale sensitivities: 1 Vrms (+13 dBm) to 100 nVrms (-127 dBm)
- RF attenuation: Up to 60 dB in 20 dB increments
- RF gain: Up to 20 dB in 20 dB increments
- Time constants: 100 μs to 30 ks with 6, 12, 18, 24 dB/oct rolloff
- Internal and external reference operation with auto-threshold feature
- Harmonic detection of 2F component
- 16,000-point data buffers with sampling up to 512 samples/s
- GPIB and RS-232 interfaces
Applications
- High-frequency RF and microwave signal measurement
- RF component characterization and testing
- Lock-in detection at microwave frequencies
- Precision phase and amplitude measurements
Specifications
| Frequency Range | 25 kHz to 200 MHz |
| Dynamic Reserve | Up to 80 dB |
| Input Impedances | 50 Ω and 1 MΩ |
| Sensitivity Range | 1 Vrms (+13 dBm) to 100 nVrms (-127 dBm) |
| RF Attenuation | Up to 60 dB |
| RF Gain | Up to 20 dB |
| Time Constants | 100 μs to 30 ks |
| Filter Rolloff | 6, 12, 18, 24 dB/oct |
| Reference Modes | Internal and External |
| Data Buffer | 2 x 16,000 points at up to 512 samples/s |
| Interfaces | GPIB, RS-232 |
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Stanford Research Systems SR844 Lock-In Amplifier
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