PCB-preamp v 1.0 14.04.2015 Description PCB-preamp is designed as preamplifier for Mid-IR PDs. It works in photovoltaic mode, which means the current generated by photodiode is amplified and converted by PCB-preamp into a voltage signal. So there is straight correspondence between PD current and resulting output voltage. That means, if the photocurrent from the photodiode is changing, the converted signal will be changing too with the same frequency and pulse duration. The current into voltage conversion coefficient is constant and depends on the given photodiode. Note! Before purchasing the PCB-preamp board, please notify us about the exact photodiode model to be used with the preamplifier, since the preamplifier board should be tuned for the appropriate photodiode type. Principal Scheme Main Characteristics Parameter Symbol Input Voltage (stabilized) Voltage Tolerance Board Dimensions VSUPPLY www.roithner-laser.com Min. Values Typ. Max. +5.0 -5 +5 26 x 10 Unit V % mm 1 Driver Layout 1. 2. 3. 4. 5. 6. 7. 8. Photodiode “-“ Photodiode GND +5 V power supply GND power supply Output signal GND Output signal “+” Photodiode “+” Photodiode GND www.roithner-laser.com 2 Operating Instruction 1. Solder your PD to the PD preamplifier: photodiode “+” to (7), photodiode “-“ to (1) and photodiode GND to (2) or (8) 2. Solder the power supply wires: +5 V to (3) and GND to (4) 3. Solder the signal output wires: “+” to (6) and GND to (5) 4. Screen photodiode and preamplifier to avoid noise 5. Connect the preamplifier output wires to signal input of the synchronous detector PCB-sdetect-3P. 6. Connect the 5 V power output of the synchronous detector with the preamplifier power input. Note! - Check all the connections before turning on the photodiode - Do not connect the photodiode to the multimeter - Make sure that the connection between the photodiode and the preamplifier is proper, safe and securely screened. 7. Choose the needed averaging time and signal amplification with the help of the appropriate jumpers of the PCB-sdetect-3P. Note! To find out more about mode adjustment of PCB-sdetect-3P, please refer to its manual. 8. Make all the connections of other boards (driver, synchronous detector, etc.) following the appropriate instructions manuals. Before turning them on, check the required connections and modes: Driver: • LED connection • Synchronisation with sync. detector • Pulse duration, frequency, current selection • External connections (if necessary) Synchronous Detector: • Photodiode input connection • Preamplifier power output connection • Synchronisation with driver • Averaging time and signal gain selection • External signal observing device connection © All Rights Reserved The above specifications are for reference purpose only and subjected to change without prior notice www.roithner-laser.com 3