California Instrument 855T-1

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® T Series 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 0.01Hz steps from 0.01Hz 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 1Hz 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 adjusted to any frequency selectable in1 Hz steps.