SWEEP_FUNCTION_GENERATOR_1

Published:2009/6/19 3:17:00 Author:May | From:SeekIC

Both IC2 and IC4 are Exar XR2206 monolithic function generators; IC4 functions as a ramp gen-erator, and IC2 functions as a generator of sine, triangular, and square waveforms. Dual operational amplifier IC1 produces a scaled, level-shifted ramp output that is capable of deflecting an oscillo-scope's horizontal sweep.Any frequency of interest along the horizontal axis of an oscilloscope that is coupled to this func-tion generator can be mgasured with an external frequency counter by manually tuning the function generator's VCO instead of sweeping it. The performance characteristics of the sweep/function gen-erator are summarized in the Table.The generator's sweep rate and frequency can be set by front-panel rotary six-position switches, Sweep Rate Switch S5 and Frequency Switch S2. The VCO control R30 manually tunes the VCO.Table 2 lists the sweep ranges of the function generator. Sweep ranges not covered in ranges 1 to 4 can be set up as required on positions 5 and 6. Selecting the VCO setting on the front panel toggle switch S4 permits tuning any fixed frequency within the total frequency range of the instrument with both frequency switch S2 and VCO control R30.The sweep rate or duration of the sweep ramp is selected by the rotary six-position Sweep Rate Switch S5. Table 3 lists the sweep rate durations for each of the six positions. Longer periods should be used for lower frequency sweeps.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Signal_Processing/Oscillator_Circuit/SWEEP_FUNCTION_GENERATOR_1.html

Print this Page | Comments | Reading(3)