Photodiode Amplifier

Can Function as Optical Power Meter
1 Part in 20,000 Resolution
Full Scale Input Range of ±20nA to ±20mA
Variable Bias Selectable from -14V to +14V
RS-232 Serial Interface

This amplifier unit 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. If a reading in Watts is desired, simply toggle the A/W setting. By adjusting the A/W setting on the amplifier to equal detector responsivity, the amplifier can measure the incident optical power. For detectors that require a reverse bias, the unit can apply a selectable bias in series with the photodetector.

An output voltage port provides a ±2V full-scale analog signal directly proportional to the LCD display reading. For noise-sensitive measurements, the unit can be disconnected from its external supply and powered from its internal batteries. Battery low indicator is activated on the LCD when batteries need recharging via included power supply. Universal power supply includes wall connectors for US, UK, Europe and Australia


Max Input Without Damage	±25mA
Full Scale Ranges	±20nA to 20mA in decade steps
A/W Setting	0.100 to 1.0000 in 0.005 increments; Defaults to 1 when not engaged
Output Impedance	100 Ohms
Bias Voltage	Selectable -14V to +14V in 7mV increments; Defaults to 0 when not engaged
Offset Control	Offsets the display by up to ±20,000 counts
Noise	<1pA p-p, DC - 1kHz with <10pF detector capacitance
Frequency Response (-3dB)	20nA: DC to 2.0kHz; 100nA: DC to 5.25kHz; 2µA: DC to 22kHz; 20µA, 200µA, 2mA, 20mA: DC to 40kHz
Display	4 1/2 digit, 0.4" high LCD
Power Requirements	Rechargeable NiMH batteries with approximately 10 hours of use
External Supply	85 to 260V AC, 50 - 60Hz universal supply, 10W max
Dimensions	5.5" W x 2.5" H x 8.5" L
Weight	2 lbs. (0.9kg) excluding external power supply
Operating Temperature	0°C to 40°C (32°F to 104°F)
Cable Included	RS-232, Power

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