The Newport 70710 is a low-noise current-to-voltage preamplifier that converts weak current signals into measurable voltage outputs. Engineered for precision photodetector measurements, it delivers six switchable gain settings from 10⁴ to 10⁹ V/A with ±1% accuracy and linearity across a DC to 100 kHz bandwidth. Noise performance reaches <2.3 × 10⁻¹² A/√Hz at 1 kHz (10⁶ V/A setting), making it ideal for photomultiplier tubes and photodiode applications where signal integrity is critical.
Technical Specifications
• Gain Settings: Six switchable ranges from 10⁴ to 10⁹ V/A
• Frequency Response: DC to 100 kHz (bandwidth affected by gain and time constant selection)
• Accuracy: ±1%
• Linearity: ±1%
• Maximum Output: ±10 V
• Noise Floor: <2.3 × 10⁻¹² A/√Hz at 1 kHz (10⁶ V/A); 4 pA/√Hz NEP at 1 kHz (10⁴ V/A)
• Maximum Input Impedance: 8000 Ω at 10⁹ V/A gain
• Time Constant: Three-position adjustable switch
• Power Requirements: ±13 to ±18 VDC at 10 mA (external ±15 VDC supply required)
– Key Features
• Dual BNC connectors for input and output
• Lightweight design at 0.1 kg
• Adjustable time constant for bandwidth optimization
• Compatible with external power supplies (Oriel 70703, 70709)
– Typical Applications
• Photomultiplier tube (PMT) signal conditioning
• Photodiode transimpedance amplification in photovoltaic mode
• Low-level optical detection and spectroscopy
• Precision current measurement from GaN, InGaAs, and silicon detectors
– Compatibility & Integration
Interfaces directly with Newport Power Meters and LIDA-SRS-KIT systems via standard BNC cable (model 70018). Supports unamplified detector models including Newport 71650 and 71653. Operates with external laboratory power supplies delivering ±15 VDC output.
