Square wave generator

The duty cycle of the square wave generated by the CTM-05 board is set by the variable DUTYman-... 

Shown in Fig. 8.6 is a fourth-order Butterworth low pass oscillator. Figure 8.7 is the square wave generated at node 10 and the resultant sine wave after filtering at node 3. The lab results are shown in Fig. 8.8. 

Figure 8.7 IsSpice results of square wave generated at node 10 and the resultant sine wave at node 3.

Figure 8.38 Schematic of multiphase square-wave generator.

Notice in the SPICE circuit (Fig. 10.16), the 50 source impedance of the square-wave generator is modeled as resistor RSOURCE. The output voltage is dependent on the conduction angle through this resistor therefore, for the measurements we will make on this circuit, it is important to include this resistance. 

It should be obvious at this point that taking a short transient is equivalent to making the measurement at a high frequency. It is not easy to compare the frequency of a sine wave to the equivalent frequency of a transient, because of the difference in the shapes of the waveforms. For an order-of-magnitude type of estimate, we can take l/t, the reciprocal of the pulse length, as the equivalent frequency. A 0.1 2s pulse, which can readily be obtained from a good square-wave generator, thus corresponds to a frequency of about Ixio Hz. 

The circuit supplying the exponential was powered by the square wave generator of the oscilloscope and the value of the decay constant was controlled by a capacitor and variable resistors in the circuit. Rate coefficients determined by this method agreed with those found by photographing the experimental trace and analyzing it graphically. 

EWDT are set so that neither delay should time out. If the EWDT times out, the EWDT output drops out, and the SIF may be shut down and/or alarmed. The pulses In this square wave can be varied by changing the application program in the square wave generator. 

PE logic solver square wave generation for the EWDT utilizes the same instruction set used in the SIF application software ... 

Fig. 5. Schematic of a Mossbauer spectrometer working in multiscaler operating mode abreviations A - multi-channel analyzer, G - square-wave generator, J - integrator, > - amplifier D - differentiator, M - movement system, S - source, A - absorbent, D - detector and S-A single channel analyzer, respectively...

With the transistor reset preamplifier, the procedure is much simpler. The preamplifier output is a step pulse. A square wave generator can be used instead of the pulse generator described above. Correction of pole-zero is not necessary. It is worth checking with the oscilloscope that within the pulse train the detector pulses and pulser pulses behave in a similar fashion. 

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