2. Monitor the output of the 50/750 with an
oscilloscope. Use a compensated high-
voltage probe with the oscilloscope if
necessary to limit the oscilloscope input
to a safe voltage level.
3. Adjust the DAMPING and RESPONSE
potentiometers for the best square wave
response (no undershoot or overshoot
and flat tops).
Given the fast response and high
stability of this amplifier, fine wave-
shapes are obtainable. When viewing
the waveshape under certain loads, a
slight overshoot may exist that will not
be adjusted out using the DAMPING
and RESPONSE potentiometers. This
helps maintain the high speed of
response of the amplifier.
PROTECTIVE CIRCUITRY
The Model 50/750 includes internal protect-
tion for high reliability.
Current Limiting
The Model 50/750 is a voltage-regulated
amplifier by controlling output current. The
output current is internally limited for protec-
tion against short circuits and overloading
conditions.
Thermal Limiting
The Model 50/750 is forced-air cooled to
remove any internal accumulation of heat.
If the internal temperature of the amplifier
rises above a safe level, the amplifier will
automatically reduce its output current
capability until the amplifier returns to a safe
area of thermal operation.
Overvoltage Protection
The Model 50/750 is designed for driving
active loads (loads capable of returning
energy into the output of the amplifier). It
incorporates output terminal voltage protect-
tion against high voltage from the load. If
the voltage at the load exceeds approxi-
mately 15% of the rated output voltage of
the amplifier, an internal clamp absorbs
additional energy from the load.
When the voltage of an active device (load)
is within the output voltage range of the
50/750, there is no practical limitation to the
amount of energy that the 50/750 must
absorb.
However, a limitation for the amount of
energy the 50/750 can absorb occurs when
the voltage of the active device exceeds the
voltage range of the 50/750. The amount of
energy that the output can absorb is a com-
plex function of the voltage, of the duration
of the current, and their effects upon differ-
ent components in the protective circuit. A
discussion of this limitation is given in
Appendix A.
9
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