BNC 575 Series Especificaciones descargar pdf (Pagina 14)

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Setting Pulse Timing Parameters

Pulses are defined by a delay, from their sync or start pulse to the active edge,

and a width.

Wid: Sets the width of the active portion of the pulse.

Dly: Sets the delay from the sync source to the start of the pulse.

NOTE: If Wid + Dly + 75 ns (hardware reset time) > T

Period, the correct pulse

width will be generated but at a slower rate.

Setting Pulse Output Parameters

There are three basic types of outputs available on the 575: (a) TTL/CMOS

compatible outputs; (b) adjustable amplitude outputs; (c) optical outputs.

Out: Selects between TTL/CMOS mode and Adjustable mode

when both are available on a single output.

Pol: Sets the voltage polarity of the pulse, active high or active

low. Note: All outputs are positive - negative voltages are

not supported.

Ampl: In adjustable mode, it sets the unloaded output voltage. The

actual output voltage will depend on the load impedance. For

example: If the load is 50 ohms, the output will be 50% of the

stated voltage.

Using the Output Multiplexer

Each output channel includes a multiplexer which allows routing any or all of the

timer outputs to the physical output. This allows double pulses and other

com-plex pulse trains to be generated. Only timing parameters are multiplexed

together, not amplitudes.

-HGFEDCBA-

Mux: -00000101-

The multiplexer is represented by an “n” bit binary number as shown above. “n” is

the number of channels. Each bit represents a channel timer, which is enabled

by setting the bit to one. In the above example, timers A and C are combined on

the current output.

Setting System Internal Rate Parameters

The internal T

period controls the fundamental output frequency of the system.

Each channel may operate at submultiples of the fundamental frequency using

their duty cycle mode.

Source: Sets the reference source for the internal T Period.

Per: Sets the internal T Period.

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BNC 575 Series Especificaciones Pagina 14