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Sect. I Page 1
1-1
GENERAL
The Model 202A Low Frequency Function Generator
is
a compact, convenient, and versatile source of
transient-free test voltages between 1200 and .008
cycles p e r second.
It
is
useful for any general
purpose low frequency testing application and
is
particularly valuable in the testing of servo systems,
geophysical equipment, vibration and stability char-
acteristics of mechanical systems, electro-medical
equipment, and for the e l e c t r i c a l simulation of
mechanical phenomena. Three types of output wave-
form a r e available; sine, square andtriangular.
Also, a sync output pulse
is
available for external use.
The Model 202A Low Frequency Function Generator
contains a type of relaxation oscillator that
is
par-
ticularly advantageous for the generation of very low
frequencies.
Both a triangular and a squarewave
voltage function of time are inherent in the oscillating
system.
Also, a sinewave function
is
produced
by synthesis from the triangular wave.
Output amplitude and distortion a r e virtually in-
dependent of the frequency of operation. This type
SECTION I
GENERAL DESCRIPTION
of oscillating system in
inherent^^
a constant am-
plitude device so that no A. V. C. system, with as-
sociated delay in stabilization after frequency changes,
is required
The frequency range from .008 to 1200 cycles per
second is covered in 5 bands. The frequency dial
is linear.
The output system is a direct-coupled amplifier
system designed for either single ended o r balanced
output. It has good stability with respect to direct
current in the output and very low hum level. Both
the FUNCTION selectro switch and the AMPLlTUDE
control a r e s o arranged that the characteristics of
the amplifier a r e independent of their position. The
internal impedance of the output amplifier
is
approx-
imately 40 ohms, and the unit is rated to deliver
a t least 30 volts peak-to-peak to a 4000 ohm load.
A negative peak sync pulse of 10 volts into a 2500
ohm load
is
also provided. It has a duration of less
than 5 microseconds and occurs a t the crest of the
sinewave and a t corresponding positions with the
other functions.
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