• Monitor signals and discriminator levels simultaneously at the multiplex output
• Logic level output pulses, TTL compatible
• Output pulses indicated by LED display
• Delay line 2.5 or 5 ms
• Audio output selectable (Within/Above /Raw)

For every waveform peak that appears “within” the window aperture set by the user, a pulse is generated at the “Within Window”output. Signals that exceed the upper level of the window produce a pulse at the “Above Window” output. A visual indication of the pulses is provided at each output by the LED display. Both the input signal and the window aperture settings are visible at the multiplex port as shown below in the upper trace. By viewing the input signal as well as the “window” discriminator levels at the multiplex port provides a convenient visualization and ease in setting up an experiment. Model W3204 multiplex circuitry samples input signals and window levels on a 70%/30% basis respectively, minimizing loss of signal information. The Lower Level control sets the lower discrimination level, and the Higher Level control sets the upper window level with respect to the lower level setting. The pulses from either output (Within Window or Above Window) are generated by the falling edge of the analyzed signal as it crosses the preset levels. Because the logic circuit is not time dependent, Model W3204 can be used to analyze signals of any duration. Ten-turn controls with dial indicators allow precise setting and direct reading of the window levels.
Enclosure includes a tilt stand for bench operation.

The diagram above shows the multiplex signal output with the widow parameters displayed on the input signal. A “within” pulse occurs at the lower level crossing point after the input signal is measured within the boundaries of the settings and an “above” pulse is generated for those signals going above the upper level setting. you can connect Above or Within output to trigger input of a digital oscilloscope then you can see the waveform that is selected but when Above or Within pulse is generated you miss first part of waveform therefore you need a delay line. Model W3204 has a delay line output that it's delay time is selectable by front panel switch to 2.5ms or 5ms.           you can select audio output and listen to raw signals or within or above pulses by a external speaker.