Table of Contents
Advertisement
16
3.2.5.
External sweep and frequency modulation
The signal frequency of the generator can be controlled by connecting an external voltage to SWEEP
INPUT.
In order to avoid superpositions by the internal sweeps, switch the range selector SWEEP
PERIOD s to OFF. The desired signal frequency (= basic frequency) must then be adjusted by means
of the dial and the range selector FREQENCY
Hz. By feeding a de or ac voltage to the sweep oscilla-
tor via SWEEP
INPUT, the signal frequency is varied proportional to this voltage (the relationship
between voltage and frequency is linear). The maximum
variation should not exceed 2 1/2 decades,
where the upper limit of the sub-range is the upper limit for the sweep range too. Otherwise you
would get signal distortions because of overdriving the controlled current source.
DIAL READING
SWEEP VOLTAGE
SWEEP FREQUENCY
Ug [VOLT]
20
10
External sweep
Advertisement
Table of Contents
