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OB920P - Data Acquisition

The OB920P employs the measurement principle of Time Correlated Single Photon Counting (TCSPC) for fluorescence measurements from 100picoseconds to 10microseconds and then employs the principle of Multi-Channel scaling (MCS) for measurements from 1microsecond to 10seconds. For TCSPC measurements we employ our TCC900 card, for MCS measurements our PCS900 fast photon counter scalar card. Both these PC plug-in cards have PCI interface. The PCS900 card can operate in both two modes for both steady state and multi-channel scaling measurements. For details of MCS operation please go to the dedicated section in the web site by following this link MCS.
All important operating parameters of the PCS900 are fully computer controlled and include input threshold, number of sweeps and gate width.


The PCS900 card features :
• PCI interface
• 3 channel counter
• Maximum count frequency of 100MHz, minimum pulse width 10ns
• Up to 4000 gates of width 300ns to 0.4s
• Up to 2³² counts per gate
• Accepts +/- 10mV to +/-5V input signal levels
• Multi channel scaling capability
• Accepts +1 to +5V external trigger
• Plug ‘n’ Play PCI bus interface.
• Standard half size PCI board dimensions

The TCC900 card incorporates all the necessary electronic modules required for Time Correlated Single Photon Counting. All the important operating parameters of the TCC900 are fully computer controlled. This include constant fraction discriminator, variable nanosecond delays, time to amplitude converter and large memory for multi-channel analysis. All that is required to perform TCSPC measurements is an optical trigger pulse from the excitation light source and the raw detector output from a single photon counting detector connected to the START and STOP inputs of the TCC900 respectively.

The TCC card features:
• PCI interface
• Time ranges 2.5ns to 50microseconds full scale
• Time resolution from 610fs/ch
• Ultra-low jitter <25ps
• Forward and Reverse modes
• Exceptional differential non-linearity
• Integrated shifting delays