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The Advantest TR5821 is a universal counter capable of measuring frequencies from 1 mHz to 120 MHz. The TR5821 can measure periods from 20ns to 1000 s and can make time interval measurements from 200 ns to 1000 s. Frequency ratio and totalization measurements can also be done from DC to 50MHz. For frequencies between 1 mHz and 50 MHz (INPUT B), the TR5821 uses the reciprocal method to find the frequency by measuring the period of the input frequency and then taking the reciprocal with the internal microprocessor to calculate the frequency. From 10 Hz to 120 MHz (INPUT A), the TR8521 uses the direct measurement method. Due to these various methods of measurement, accurate measurement of frequencies from low to high can be obtained from a single unit. The TR5821 also features a Masking Function, Autotrigger Function and can perform a self-check. When used with the TR1644, the TR5821 can do calculations on the measured results.
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