HP 202A Operating And Service Manual
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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 per 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 electrical simulation of
mechanical phenomena. Three types of output wave-
form are 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 are 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 or 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 are so arranged that the characteristics of
the amplifier are independent of their position. The
internal impedance of the output amplifier
is
approx-
imately 40 ohms, and the unit
is
rated to deliver
at 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 at the crest of the
sinewave and at corresponding positions with the
other functions.