VR301
is
for fine adjustment of square wave amplitude; R313
is
for TTL output buffer
resistor,
it
can reduce phenomena of
overshoot and ringing. Sinewave
is
made by using triangle wave to
make non-linear amplification, and in the instrument to attenuate
triangle wave in advance. (made by
R4O3, and R404) and then make
non-linear amplification, phase shift etc. (made by U401) and again
to input power stage and amplify. VR401
is
to adjust clip point of
sinewave,
i.e.
course adjustment of sinewave distortion. VR403
is
to adjust the symmetry of sinewave,
i.e.
fine adjustment of sine
wave distortion, R405-R407 are "differential state
Re
resistor",
to supply constant current. VR404, R408 are load resistor of
differential output to take resistance and signal output into
positive ratio relation, to adjust VR404 to get the
"GAIN".
Two transistors at the right side of U401 are in charge of the
work of phase shift, because the output of the 8th pin
is
constantly
positive signal source. To adjust VR402 can make U401
its
14th pin
output be zero
D.C.
offset of
A.C.
sinewave. R401, R402 are
decoupling resistor. C401, C402 are decoupling capacitor. R412
supplies
VB
bias.
U303
is
in charge of CMOS level output, and
its
output amplification
is
taken from VR302, then via TTL/CMOS selective switch output to
BNC
at the front panel, while Q301
is
in charge of TTL level to
increase to CMOS level, because (2301 output via collector has
inverter function. Therefore, output at TTL and then via another
AND
GATE to couple the signal here.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
To Next Page
Loading...
