Frequency counter adds TCXO timebase
The TF930 3 GHz low-cost universal frequency counter from Aim-TTi now incorporates a temperature-controlled crystal oscillator (TCXO) timebase, giving it a stability within ±1 ppm over its full operating temperature range together with a low aging rate. Â
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 sec and ten digits in 100 sec, with a granularity of less than two counts in the least significant digit.

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The overall frequency range is from 0.001 Hz to over 3000 MHz, with high sensitivity across the range. For frequencies up to 125 MHz the input is configurable as 1 megohm or 50 ohm 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.
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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 4 hours, and can be used for continuous AC operation. The instrument can also be powered from a standard USB port.