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Transimpedance amplifier for Light Detectors

Silicon, Germanium and Indium Gallium Arsenide Photodiodes offer best linearity correlation of light input to their electrical signal when are operated in photovoltaic mode. Simulation of a real short circuit at a signal amplifier input requires a current to voltage conversion amplifier with very low offset voltage independent of the selected gain range.

Low noise output signal

The P-9202 amplifiers assembled in a metal shielding housing equipped with low noise feedback resisters and gold contact read-relays for gain selection offer very low noise voltage signals.

Short rise time model P-9202-4

The P-9202-4 model is a fast amplifier with a 8-step switchable sensitivity range from 300 nA/V to 1 mA/V and a nearly constant slew-rate of 1 µs in all gain ranges. Photodiodes can be operated in photovoltaic or photodiode mode (-5 V bias voltage). Useful in applications requiring high bandwidth up to 330 kHz or short 1 µs rise time.

General purpose model P-9202-5

The P-9202-5 model is a general purpose amplifier featuring an 8-step switchable sensitivity range from 100 pA/V to 1 mA/V and gain dependent slew-rate. Photodiodes can be operated in photovoltaic or photodiode mode (-5 V bias voltage).

Very high gain model P-9202-6

The P-9202-6 model is a very high sensitivity amplifier with an 8-step switchable sensitivity range from 10 pA/V to 100 µA/V and variable, gain dependent slew rates. This model is suited to applications involving very low photodiode signals starting in the 10 femto A (0.01 pA) range.

Current Input

Connector: BNC Socket (Shield: -5V BIAS voltage or GND)

Max. signal current

± 5 mA

max. Input Voltage

DC-Supply Voltage / 2


± 2 pA (@ 20 °C)


-5V BIAS Voltage at shield of Input BNC Socket (switchable to 0 VDC or -5V DC). If -5V BIAS voltage is used, the anode of the detector has to be connected to the shield and the cathode to the inner contact of the BNC Input connector.

Output Voltage

Output voltage corresponding to the input current
Connector: BNC Socket
Max. Output Voltage: ± 9V

If an oscilloscope is used to measure the output voltage, set the input impedance of the oscilloscope to 1MOhm.

Current / Voltage gain ranges

8 (see "Range Data Specification")

Measurement range

10 position rotary switch (OFF, REM, 8 Ranges)


Optocoupler input for external gain switch
(5V / 25mA)
Connector: DSUB 9 pins, female

Range Specifications
Range Number Range Gain
(10 - 90%)
1 1x10-3 5µs 1mV 0,2%1mV 10nV
2 1x10-4 5µs 1mV 0,2%1mV 100nV
3 1x10-5 30µs 1mV 0,2%1mV 1µV
4 1x10-6 30µs 1mV 0,2%1mV 10µV
5 1x10-7 500µs 1mV 0,2%1mV 100µV
6 1x10-8 500µs 2mV 0,2%1mV 1mV
7 1x10-9 20ms 1mV 0,7%1mV 10mV
8 1x10-10 20ms 4mV 0,7%1mV 100mV

*) The offset error is produced by the finite internal resistance of the current source. To calculate the offset error use the value in the column 'Offset' with the following formula:

U = Offset / (R / k)
U: max. Offset Voltage at Output)
R: internal Resistance of the current source (unit k)

Remote Range Control

The range can be selected via the remote interface. The rotary switch therefore has be set to "REM". By applying +5VDC voltage (current max. 25mA) at the corresponding control pin of the remote connecter the measurement range can be set.

Connector REMOTE (Connector Type: DSUB 9 pin female)

Pin 1 Remote range group selection
(Range 1 / 3 / 5 / 7 or Range 2 / 4 / 6 / 8
Pin 2 Remote range 7/8
Pin 3 Remote range 5/6
Pin 4 Remote range 3/4
Pin 5 Remote range 1/2
Pin 6 GND
Pin 7 Analog output (ROUT = 1k)
Pin 8 Remote range common
Pin 9 free

The desired range is selected by applying a voltage of 5VDC between the corresponding pins an pin 8

Range Pin 5 Pin 4 Pin 3 Pin 2 Pin 1
1 5V 0* 0* 0* 0*
2 5V 0* 0* 0* 5V
3 0* 5V 0* 0* 0V
4 0* 5V 0* 0* 5V
5 0* 0* 5V 0* 0*
6 0* 0* 5V 0* 5V
7 0* 0* 0* 5V 0*
8 0* 0* 0* 5V 5V
Power Supply

(16 - 24) VDC / 80mA
Connector: Friwo Nb. 105316

Important Note: only use plug-in power supply supplied

temperature range

operation: (5 bis 40) °C

storage: (-10 bis 50) °C


105 mm x 80 mm x 45 mm


<80%, non-condensing


In the case of very high humidity, fault currents of the radiometer are possible at low measuring currents and should be taken into account.


P-9202-4: 1µs slew-rate
P-9202-6: high sensitivity

Type Description File-Type Download
Datasheet P-9202-5 PDF
Produktname Product Image Description Show product
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Article-Nr Modell Description Request / Compare
15295282 P-9202-5

Amplifier, with power supply and manual

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