Time/Frequency Counter Model T2500 - VIGO System - #1

Time/Frequency Counter Model T2500

High Performance Instmme nta tio n

Single PCI PnP card for PC Built-in automatic calibrator Time interval measurement range:

0 - 4400 sec onds 45 ps re so lutio n in single -sho t time -inte rval measurements (without averaging) Standard uncertainty < 80 ps RMS for time interval from 0 to 1 ms Measurement of pulse width Frequency range up to 3.5 GHz, rec iproc al method in two mo des Frequency sampling mode and graphic al display of sampled data in time domain to show frequency modulation Measurement of Allan deviation To ta lize mo de

♦ Pre c ise co mpariso n of so urc e s of the same nominal frequency to evaluate time d rift o f fre q ue nc y

♦ FAST Maximum measurement rate: 5 M measure me nts/s to internal FIFO memory and 400 Kmeasurements/s to PC memory

♦ Input impedance: 50 Q

♦ Se le c ta b le p ulse e d g e a nd p o la rity

♦ Selec table input threshold level or automatic threshold searc h

♦ Comprehensive statistic al proc essing

♦ User-friendly software for Windows and DLLfle for users applications

♦ Easy export of data files for processing in other programs (Stab le 32, MS Ecce I)

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The T2500 Time/Frequency Counter occupies one PCI slot in a PC and combines the performance of more expensive stand-alone counters with the convenience of the personal computer. The related software creates a graphic user-friendly interface and provides advanc ed functions for c ontrol, diagnostic s and statistic al proc e ssing of the measurement data.

The heart of the instrument is a newly developed FPGA c ounter devic e, which c ontains a complete interpolation time counter with two precision two-stage Time-to-Digital Converters, a FIFO memory which allows for very high measurement rate, two look-up tables (HJT) for nonlinearity correction on-the-fly, and a dedicated microcontroller.

VI GO System S.A.