TCXO Timebase for Universal Frequency Counter

Aim-TTi has announced that the TF930 3GHz low-cost universal frequency counter incorporates a temperature-controlled crystal oscillator (TCXO) timebase. This is said to give it stability within +/- ppm over its full operating temperature range, combined with a low ageing rate. The counter can measure frequency period, pulse width, duty cycle and frequency ratio, as well as event counting (totalise). For frequency, period and ratio functions, the instrument uses a reciprocal counting technique to provide high resolution at all frequencies.

Eight significant digits of reading are produced in a one-second measurement time, nine digits in 10 seconds and 10 digits in 100 seconds, with a granularity of less than two counts in the least significant digit. The overall frequency range is from 0.001Hz to more than 3,000MHz, with high sensitivity across the range. For frequencies up to 125MHz the input is configurable as 1megohm or 50ohm impedance, AC or DC coupling, and 1:1 or 5:1 attenuation.

The threshold is fully variable and the active edge can be positive or negative. The TF930 incorporates a USB interface, which allows it to be remotely controlled via a computer's USB port. It operates from internal rechargeable NiMH batteries, which give typically 24 hours' operating life. The universal AC charger supplied will recharge the batteries in less than four hours, and can be used for continuous AC operation. The instrument can also be powered from a standard USB port.

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