FEATURES AND ADVANTAGES
- Eight Decade Dynamic Range
- Less Than 1 pA Noise
- Maximum Resolution 1 part in +/- 20,000
- Rechargeable Ni-mH Batteries for Low Noise
- Digital Input of A/W value yields readout in Watts
- Computer Interface for easy control
- Background Cancelation of +/- 200 %
- Digitally set bias source from -14.00V to +14.00V
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 other similar current source. With full scale input ranges
of 20 nA to 20 mA and a noise level of less than 1 pA, the PDA-750 offers superb
Digital selection of a calibration factor in terms of Amps/Watt via the front
panel controls permits the unit to display the measurement directly in terms
of Watts. The A/W setting may range from 1.000 to 0.100 in .005 steps. Subsequent
current readings are divided by this cal factor when the Amps / Watt control
A variable bias voltage ranging from +14 V to -14 V may be digitally selected
from the front panel and applied in series with the photodiode under test. The
background cancellation feature allows offsets of from +100 % to -100 % of the
selected full scale range to be added or subtracted from the input signal.
Rechargeable batteries isolate the unit from the mains and eliminate the effects
of ground loops and/or power line noise. They will provide power to the unit
for a minimum of 10 hours of operation between charges. The unit may be operated
normally while the batteries are charging.
The large 4 1/2 digit 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.
An analog output is provided with a 2 volt full-scale signal that is proportional
to the maximum display reading of 20,000 counts. Applications for this unit
include; serving as a readout for Unity Quantum Efficient Detectors such as
those manufactured by UDT Instruments, characterization of detector dark current,
spectral calibration of detectors, and use as a sensitive, low cost optical
The instrument may be controlled and interrogated by means of its built-in bi-directional
Rs-232 serial port.
All settings are retained in non-volatile memory so that the user need not reset
all values when the unit is turned back on. The instrument is covered by a standard
two year limited warranty.
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