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Measurement of time interval Frequency sampling mpling Functions Time Interval (between two pulses at two inputs or pulses appearing consecutively at a single, common input), Delay, Period, Pulse Width, Frequency, Frequency Stability, Allan Deviation, Frequency Sampling, Totalize

Time/Frequency Counter Model T2500 - 38567 Specifications Specifications

Functions Time Interval (between two pulses at two inputs or pulses appearing consecutively at a single, common input), Delay, Period, Pulse Width, Frequency, Frequency Stability, Allan Deviation, Frequency Sampling, Totalize Statistics Statistics Mean, Min and Max Values, Standard Deviation, Allan Deviation (frequency) Mean, Min and Max Values, Standard Deviation, Allan Deviation (frequency) Graphics Graphics Tables and plots of statistical distributions, display of frequency sampling in time domain to show possible frequency modulation (Sampling mode) Tables and plots of statistical distributions, display of frequency sampling in time domain to show possible frequency modulation (Sampling mode) Time Interval, Delay & Period Time Interval, Delay & Period Range Range 0 – 4400 seconds (Inputs 0 – 4400 seconds (Inputs A A and and B B ) ) Resolution Resolution (LSB) 45 ps in single-shot measurements, may be reduced with averaging (LSB) 45 ps in single-shot measurements, may be reduced with averaging Standard Uncertainty Standard Uncertainty

Sampl eSize _

ps RMS with averaging, at time interval from 0 to 1 ms Systematic Error
6 measurements per second maximum (when measuring zero time interval and storing data in internal FIFO memory) and 4·10
5 measurements per second stored to memory in PC Frequency Range Inputs A and B : 0.1 Hz to 250 MHz Sensitivity
12 counts Input frequency max.250 MHz EN ), Manual Start-Stop InputsA and B Impedance: 50 , DC coupled; SMA sockets Amplitude: within 4 V Pulse edge: selectable, rising or falling Threshold: manually adjustable from -4 V to +4 V with 40 mV resolution, or set automatically Inputs EN, F and CLK (ext.) Impedance: 50 , DC coupled; SMA sockets Internal Clock Generator 10 MHz TCXO, stability max. 0.5 ppm (-40 C to +85 C) External Clock Generator 10 MHz, sine or pulse, min. 100 mV on 50 input impedance; SMA socket Capacity of Internal Memory 4 K measurements Supplied Software for Windows
® 98/2000/NT/XP/Vista, DLL file for other applications