conoptics 25d Installation Information

MODEL 25D INSTALLATION INFORMATION

The model 25D electronics is a high voltage push-pull power amplifier
capable of output voltage swings in the order of 175v P-P, push pull. The output
stage of the amplifier is the only saturating part of the amplifier. Although the
amplifier accepts standard TTL drive levels as its input, the entire amplifier with
the exception of the output stage is linear. At the very input of the amplifier, a
switch allows the user to select either TTL or low level analog as its required
input format.
TTL: This input mode employs a S140 line driver as a buffer between the
input signal entering the system and the power amp. This allows the customer
some latitude on logic highs and lows at the input. As the input section of the
amplifier is linear, care must be taken not to drive this section of the amplifier into
saturation and cutoff. By virtue of an onboard line driver, the actual input signals
may be rather sloppy and still the internal line driving gate delivers the required
signal to the amplifier.
ANALOG: This input mode is included to allow operation of the model
25D with the model 305 synchronous countdown. The model 305 outputs a 0 to
+1v, high-speed analog pulse which is used to operate the model 25D in the
"pulse picking" mode. This mode should only be selected when driven by the
model 305.
For most applications the TTL input mode is selected. The only exception
is when the system is shipped with the model 305. In both applications, the input
impedance is 50 ohms.
TTL input signal mode,
All signal levels should be checked with an oscilloscope with the signal
terminated in 50 ohms before applying to driver input.
logic high, >+2v, <+4.5v
Logic low, <+.8v, >0
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