427A Delay Amplifier

• Variable delay of linear or logic signals
• Provides arrival time alignment for pulses in coincidence and gating systems
• Delay range:  0 to 4.75 ms
• Completely dc-coupled
• Rise time £400 ns

The Model 427A Delay Amplifier is suitable for any general-purpose variable delay of linear or logic signals within the range from 0.25 through 4.75 ms. All signals, of either polarity and up to 10 V in amplitude, are delayed by the selected time and are reproduced at the outputs. Two outputs are included, one with an impedance nominally 1 W and the other 93 W.

The convenient switch-selectable steps of delay permit the time to be normalized between two or more signal paths to simplify coincidence and gating system adjustments. Each signal is subject to normal delays as it is processed through a signal path. The Model 427A can delay the earlier of two signals such that the pair of signals will coincide in a subsequent analysis.

The input impedance is not affected by the selected delay so that no signal loading change occurs. The dc-coupled input is furnished through a buffer amplifier that eliminates any interference from the delay selection network. The input impedance is more than 1 kW.

The Model 427A accommodates very high count rates without distortion because the instrument is completely dc-coupled. This, together with the fact that the gain from input to output is unity, ensure that the only function it will provide will be controlled delay for each signal furnished through it.

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