BI200 / BI201 Counters / Time Interval Analyzers
The BI200/BI201 are ultra high performance time and fre-quency measurement instruments. Their high resolution and throughput, combined with continuous measurement capability, allow you to make measurements that are not possible with traditional time-interval counters. For example, they can time¬tag events (edges of an input pulse train) at a rate of 4 million per second continuously to on-board memory, while each of the edges is measured with 3 ps resolution. This provides them with the capa¬bility to analyze the dynamic variations in pulse timing, pulsewidth, or frequency. In other words, the difference be¬tween the BI200/BI201 and traditional counter/timers is analogous to the difference between voltmeters and scopes. Measure¬ments can also be streamed continuously over the PCI Ex¬press bus allowing unlimited acquisition at high rates.
The BI200/BI201 are full instruments-on-a-card with all the features and capabilities you would expect in bench-top in-struments including high quality inputs, built-in NIST traceable calibration, and software and hardware that deliver fully com-puted results. The instruments have 10 measurement functions such as Fre¬quency, Time Interval and Pulsewidth. All functions work di¬rectly on the input signal at frequencies up to 2 GHz (4 Gb/s) for the BI200, or 800 MHz (1.6 Gb/s) for the BI201 with¬out any prescaling. This means that with the BI200 you can measure pulses as narrow as 100 ps, occurring at frequencies up to 2 GHz, or the skew between two signals at 4 Gb/s.
The inputs of the instruments include programmable termina-tion voltage and hysteresis. These are features that are seldom found even in the best of the bench-top instruments. When you connect your signal source to the BI200/BI201 it sees a 50 ohm load which is terminated to an accurately programmable volt¬age between -2 V and +3 V. This allows you to connect ECL, PECL, or CML sources directly to the instruments with the proper loading. It even allows you to terminate the signal from CMOS sources to a center voltage which provides a symmetri¬cal load for superior performance. The programmable hys¬teresis is an important feature for signals with slow risetime or high noise levels.
|App note: Clock Chip and Oscillator Testing|
|App note: Frequency Reference Comparison|
The software for the BI200/BI201 is designed for ease of use and extremely high performance. The driver software auto-matically manages the streaming of measurements at the su-per high rates which are possible with the PCI Express inter-face. The front panel software for Windows allows you to easily set up multiple simultaneous displays of the measure-ments. This gives multiple views of the same data, or different functions from the same data. For example, you can set up the display to show a graph of the frequency of the signal vs. time, plus a tabular display of the same results, plus a graph of the time deviation of the signal vs. time, all from the same measure¬ment acquisition run. The front panel can also run multiple instruments simultaneously.
The actual screen shot in the following page shows three views of the same Time Interval Error (TIE) measurement of a clock signal. Notice how the graph clearly shows a repetitive devia¬tion in the clock edge timing of about 8 ps which occurs about every 170 ms. Also, note the rms jitter of 3.8 ps which is shown in the digital display. This is the jitter of the signal plus the in¬strument measurement noise. The table display provides addi¬tional information about each of the measurement points.
|Max Freq. (All Func.)||2 GHz / 800 MHz|
|Max Freq. (Freq. Func.)||2 GHz / 800 MHz|
|Time Resolution||3 ps|
|Freq. Resolution||12 Digits/s|
|Meas. Rate||4 MSa/s|
|Min. Pulse Width||100 ps|
|Brand||Carmel Instruments LLC|