Transimpedance Amplifier permits digital entry of A/W.
Press Release Summary:
Model PdA-750 provides direct digital readout of current generated from photodiode, photomultiplier, or similar current source. Full-scale input ranges are ±20 nA to ±20 mA with noise level of less than 1 pA. Unit features variable bias supply, background cancellation, bi-directional RS-232 port, and rechargeable batteries. Large 4½ digit LCD provides max resolution of 1 part in 20,000, permitting detection of very small changes in signal.Original Press Release:
TTI Announces the PDA-750 Photodiode Transimpedance Amplifier
Oriskany, New York, October 13, 2003: The PDA-750 is a low noise, high gain, transimpedance amplifier that is designed to provide a direct digital readout of the current generated from a photodiode, photomultiplier, or similar current source. Specifications include full-scale input ranges of +/- 20 nA to +/- 20 mA with a noise level of less than 1 pA for excellent dynamic range, digital entry of Amps/Watt parameters, variable bias supply, background cancellation, bi-directional Rs-232 port, and rechargeable batteries. The large 4-½ digit Liquid Crystal Display provides a maximum resolution of 1 part in 20,000 permitting the detection of very small changes in the signal under test.
Applications for this instrument include: serving as a readout for Unity Quantum Efficient Detectors, characterization of detector dark current, a readout interface for spectrometers, spectral calibration of detectors, a high gain precision transimpedance amplifier, and as a sensitive, high precision optical power meter.
Full Scale Ranges - +/- 20 nA to 20 mA
Max. Input w/o Damage - +/- 25 mA
Measurement Uncertainty - +/- 0.05 % of reading; +/- 1 LSD
A/W Setting - 0.100 to 1.000 in .005 increments
Input Capacitance - 25 pF
Bias Voltage - Can be set from - 14 to + 14 V in 7 segments
Noise & Drift - <+/- 1 pA /5 seconds (most sensitive scale)
