Photodiode Amplifier
• Can Function as Optical Power Meter
• 1 Part in 20.000 Resolution
• Full Scale Input Range of ±20 nA to ±20 mA
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 in 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 ±2 V 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. RS-232 &
Power cables included.
Max. Input Without Damage: ±25 mA
Full Scale Ranges: ±20 nA to 20 mA in decade steps
A/W Setting: 0,100 to 1,0000 in 0,005 increments;
Defaults to 1 when not engaged
Output Impedance: 100Ω
Bias Voltage: Selectable -14 V to +14 V in 7 mV increments;
Defaults to 0 when not engaged
Offset Control: Offsets the display by up to ±20.000 counts
Noise: < 1pA p-p, DC-1 kHz with < 10pF Detector capacitance
Frequency Response (-3 dB): 20 nA: DC to 2,0 kHz, 100 nA: DC to 5,25 kHz,
2 μA: DC to 22 kHz, 20 μA, 200 μA, 2 mA, 20 mA: DC to 40 kHz
Display: 41/2 digit, 0,4" high LCD
Power Requirements: Rechargeable NiMH batteries w/ approx. 10 hours of use
External Supply: 85 to 260 V AC, 50-60 Hz universal supply, 10 W max.
Dimensions: 5,5" W x 2,5" H x 8,5" L
Operating Temperature: 0° to 40°C
Current Amplifier Modules
Variable Low Noise Current Amplifier #59-178 €2.300,00
USB Controlled Amplifier #34-789 €1.250,00
Variable Gain High Speed Current Amplifier #59-179 €2.400,00
220V Power Supply for #59-178/#59-179 #59-180 €190,00
High Speed Current Amplifier (#59-179)
USB Controlled Amplifier (#34-789)
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Current Amplifier Modules
• Variable Gain
• High Speed and Low Noise Designs
• USB Controlled Version
Current Amplifier Modules are current-to-voltage conversion devices used to amplify a small current from a
photodiode or photomultiplier with very low noise. Our Low Noise, USB Controlled, and High Speed versions
are available with variable gain functionalities. The Low Noise amplifier is a two stage, low-noise amplifier with
switchable AC/DC coupling, adjustable bias voltage offset, and a 10 Hz lowpass filter. The High Speed model
also features AC/DC coupling in addition to an adjustable offset for baseline correction, adjustable bias for use
with fast photodiodes, and a switchable 10 MHz and 1 MHz low pass filters.
The USB Controlled Current Amplifier is designed for precise measurement of current from pA to mA, and
features both digital and analog signal processing allowing for both USB and DB25 control. Each USB Controlled
Amplifier includes an SDK for ease of system integration, a GUI that actively controls gain ranges, bandwidths,
and polarity, as well as a LabVIEW® VI example. These Current Amplifier Modules have BNC input and output
connections for easy integration between the Data Acquisition System’s Terminal Block or oscilloscope and
detector, ensuring effortless system design and configuration when used with detectors with a BNC connection.
Current Amplifier Modules Specifications *USB Overrides TTL When GUI Opened
Module: Variable Gain Standard
Current Amplifier Variable Low Noise Current Amplifier USB Controlled Current Amplifier Variable Gain High Speed
Current Amplifier
Transimpedance Gain: HI: 10 MΩ; MID: 1 MΩ; LO: 100 KΩ 103 to 1011Ω (adjustable in decade steps) 103 - 108Ω (6 gain ranges in decade steps) 102 to 108Ω (adjustable in decade steps)
Bandwidth (-3 dB): HI: DC-2 kHz; MID: DC-20 kHz; LO: DC-200 kHz 500 KHz max. 10 kHz; 1kHz; 100 Hz; 10 Hz (controllable via software) 200 MHz max.
Input Current Noise (A/ Hz): HI: 4,0 x 10-14; MID: 1,2 x 10-13; LO: 4,0 x 10-13 See datasheet on our website HI: 30pARMS; LO: 7pARMS See datasheet on our website
Bias Voltage: Applied via external bias pin ±10V, max., 22mA, Adjustable by trimpot or
external control voltage
Receptacle provided for external bias input. Maximum
bias for safe operation: 10V.
Adjustable by trimpot or
external control voltage
Offset Adjustment: N/A Adjustable by trimpot or external control voltage Up To 10V Offset Nulling Adjustable by external control voltage
Remote Control: No Yes USB Control via Provided GUI or
DB25 Hardwire Interface (TTL)* Yes
Case Size (mm): 25,4 L x 50,8 W x 25,4 H 150 L x 55 W x 44 H 116 L x 105 W x 45 H (Case Only); 116 L x 130 W x
45 H (Case and Mount) 150 L x 55 W x 40 H
Operating Temperature: 0 to 60°C 0 to 60° C 0 - 60°C 0 to 60° C
Power Supply: ±5 to ±15 V DC 20 mA; 9-pin D-sub connector
(not included) ±15 V, +110 mA/-90 mA (not included) Universal (Included) ±15 V, +110 mA/-90 mA
(not included)
Weight: 117 g (0,26 lbs) 320 g (0,74 lbs) 500 g (1,10 lbs) 320 g (0,74 lbs)
for?info?made?CE?marked?hazardous?system?new?EO?designed?&?new?CE?marked?military
call?for?made?for?info?hazardous?caution:?harsh?Photodiode Amplifier
Description Stock No. Price
Photodiode Amplifier #57-601 €1.325,00
#57-601
#38-903
#53-373
caution:?harsh?
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