Power Supplies; Test Point Waveforms - Avtech AV-1002-C-KMP2 Instructions Manual

which is buffered by a 741 op amp (IC19) with a gain of -0.67. The baseline offset is fed
to the op amp through a 1.5kQ resistor, giving unity gain for the offset. Lastly, the SL50
output is fed into a 502 backmatching resistor. Since the load is most likely 50Q, this
produces a resistor divider effect at the main output. The op amp can supply a maximum
of + 11V out, so this 50Q backmatching resistor is shorted out in the 10V range to provide
for maximum voltage swing, with slightly increased reflections and distortion.
POWER SUPPLIES
A dual secondary transformer (DMT-8-12) and seven linear regulator IC's are used to
generate the following voltages:
-2 Volts (150 mA)
-5.2 Volts (600 mA)
+15 Volts (200 mA)
-15 Volts (100 mA)
+5 Volts (850 mA)
+24 Volts (20 mA)
-24 = Volts (20 mA)
The voltage test points are provided on the power supply printed circuit.
TEST POINT WAVEFORMS
Twelve key TP points (test points) are indicated on the circuit diagrams along with sample
waveforms. In the event of an instrument failure or malfunction, the TP waveforms may be
used to isolate and identify the offending circuit (or component). The twelve TP points are
indicated in white lettering on the pulse generator printed circuit board.