88-65 76th Avenue • Glendale, NY 11385, USA • Tel: 718-997-8100 • Fax: 718-997-8102 • www.eopc.com

Photodiode Transimpedance Amplifiers
  • 7 decade full scale dynamic range +/-20 nA to 2.0 mA
  • Max input without damage: +/-10 mA
  • Accuracy: +/-0.5% Rdg +/-2 LSD
  • Amps/Watt setting: 0.1000 to 1.0000
  • Amps/Watt setting accuracy: +/-0.5% Rdg +/-2 LSD
  • Digital input of A/W value provides direct readout in Watts
  • Input impedance: 0 Ohms, single ended
  • Input capacitance: 25pF
  • Output impedance: 100 Ohms
  • Bias voltage: -10V to +10V
  • Drift: <20pa/hr after 10 minutes warm up period
  • Voltage noise: <1.1 uv, dc to 10hz
  • Noise: <1 pa with <10 pf det.
  • Background cancellation: +/-200% of range in use
  • Temperature coefficient: <2pa/°C
  • Frequency response: DC to 2000Hz
  • Display: 4 1/2 digit, 0.4" high LCD with LED back lighting
  • Maximum resolution 1 part in 20,000
  • Rechargeable Ni-Cad batteries, 20 hours of use
  • External supply: 110 or 240 VAC, 50-60Hz, 15W max
  • Dimensions: 6.5"W × 9"L × 2.75"H (16.5cm × 23cm × 7 cm)
  • Weight: 3 lbs (1.36 Kg) excluding external supply
  • Operating temperature: 0-400°C


optical modulators / choppers / shutters
tuning fork (fixed frequency) choppers
variable frequency choppers
choppers / shutters
rotating wheel (variable frequency) choppers

optical chopping / modulating systems
optical chopping systems locked to ext. clock
optical chopping systems locked in master/slave mode

optical SAFETY shutters
laser safety (interlock) shutters
X-Ray (interlock) shutters

optical shutters, choppers and filters
optical shutters / choppers
optical choppers / shutters
filter selectors

optical scanners and deflectors
resonant (fixed frequency) scanners
beam deflectors

optical scanning / deflecting systems
- optical scanners locked to an external clock signal
- optical scanning systems to generate
a circle or an ellipse or to lock optical scanners
in phase or out of phase

- optical scanning systems to generate
a Raster Scan or Lissajous Patterns

- X,Y raster scanning systems
- 2-axis deflectors

ED Driver
AGC Driver
PLD-1C Driver
PLD-1S Driver
PLD-2C Driver
PLD-2S Driver
PLD-2SXY Driver
PLD-XYG Driver
DCH-40 Driver
DCH-50 Driver
DCH-60 Driver
DSH-10 Driver
DSH-20 Driver
DSH-35 Driver
DSH-65 Driver

other products
Filter selectors
Rotating Wheel Optical Choppers
photo diode amplifiers
o/e and e/o converters
fiber optic multiplexers
fiber optic video links
laser vibrometers
Photodiode Transimpedance Amplifier
Analog / digital fiber links
Optical time domain reflectometers
Optical spectrum detectors
Tuneable laser sources
Variable optical attenuators
Loss test sets
Fiber optic power meters
Light sources
Visual fault locators
Video probes
Fiber identifiers

Data Sheets

contact us


The PDA-700 is a low noise, high gain, transimpedance amplifier designed to provide a direct digital readout of the current generated from a photodiode, photomultiplier or other similar current source. Digital selection of a calibration factor in terms of Amp/Watt via the front panel controls permits the unit to display the measurement directly in Watts. The A/W setting may range from 1.0000 to 0.1000. Subsequent current readings are divided by this cal factor when the Amps/Watt control is engaged. A variable bias voltage, ranging from +10V to -10V, may be digitally selected from the front panel and applied in series with the photodiode under test. The background cancellation feature allows offsets from +200% to -200% of the selected full scale range to be added to or subtracted from the input signal.

A large liquid crystal display provides a maximum resolution of 1 part in 20,000, thus permitting the detection of very small changes in the variable that is to be measured. the display is also equipped with an LED back-light for reading in a darkened laboratory. An analog output is provided with a 2 volt full-scale signal that is proportional to the maximum display reading of 20,000 counts. Rechargeable batteries isolate the unit from the mains and eliminate the effects of ground loops and/or power line noise. They provide power to the unit for a minimum of 20 hours of operation between charges. The unit may be operated normally while the batteries are charging. The instrument is covered by a standard two year limited warranty.

Applications include: serving as a readout for Unity Quantum Efficient Detectors such as those manufactured by Graseby Optronics, characterization of detector dark current, spectral calibration of detectors and use as a sensitive low cost optical power meter.

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