California Instruments 850T Oscillator
Variable Frequency Oscillator


California Instruments’ 850T Series variable frequency oscillators and 855T Series fixed frequency : oscillators are designed to plug into and derive their ; power from any of the Invertron® AC Power Sources. ' The output of the Oscillator then provides the input frequency and amplitude drive for the Power Source. They employ digital logic techniques for frequency generation with a crystal controlled Oscillator serving as the reference for the digital logic circuits. This technique provides long term frequency stability not obtainable with analog circuits. The 850T Series has three frequency ranges selected with a front panel switch. There are four frequency selection controls, : permitting precise adjustment of the output frequency with resolution of one part in ten-thousand. Frequency is adjustable in 0.01 Hz steps from 0.01 Hz to 99,99 Hz in the XI range, in 0.1 Hz steps from 0.1 to 999.9 Hz in the X10 range and in 1 Hz steps from 1 : to 9999 Hz in the X100 range. By setting the internal switches and making other minor internal changes to < the 855T its output frequency may be similarly ad- ' justed to any frequency selectable in 1 Hz steps. ,The crystal Oscillator reference has an average frequency stability of five parts per million per degree Centigrade. Thus, with the frequency having been set at room temperature, the maximum variation^ would j be ; approximately 125 parts per million (0.0125%) oyer the 0 to 55°C range.; The oscillatorfrequency is divided by digital logic circuits to the selected output frequency and then filtered to remove harmonic components. The 850T.855T Series Oscillators will shut down if ; the frequency is outside of factory set limits. This ; prevents selection of ;a frequency outside the operating limits of the associated power source, in the case of the 850T and protects against a malfunction of the Oscillator circuits that would produce a frequency outside these limits. The 850T.855T Series Oscillators are equipped with ■ a “soft start” feature that slowly increases the output ; amplitude from zero to the set level unit is first turned on. The 850T also “soft starts” when resuming operation after automatic shutdown caused by selection of an out-of-limit frequency. Both the 850T and 855T Oscillators may be equipped with optional circuit boards to provide two- or three- phase outputs. Additionally, the output phases may be set to any 30 degree increment relative to the reference phase. Because of the digital techniques employed, the electrical angle between phases remains constant irrespective of frequency.

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Documento scansionato, la lettura in parte male, non in parte leggibile.
Data caricamento:
20 dicembre 2015


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