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MeasurementThe A7 frequency/phase analyser is an improved version of the previous model for measuring a wide range of frequency standards, isolation amplifiers, frequency multipliers and dividers and passive devices such as cables. The instrument is self contained with an internal phase meter and needs no external counter. A PC running most operating systems with one RS232 port provides a sophisticated user interface with immediate calculation and graphing of Allan variance. A digital display of phase or fractional frequency offset is provided. Tau values from 1ms to 2000 seconds may be used. A unique RS232 interface protocol has been designed which prevents Windows from losing data. The phase meter has a 32k buffer which provides complete protection to the data if the computer fails during a measurement run. Data blocks with up to 32k readings may be stored to disk for analysis with an external program such as Stable 32.
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