Racal Instruments 3155 Spezifikationen PDF herunterladen (Seite 22)

User Manual 3155

Overview 1-9

modulation affect this output directly. The sine waveform output is

programmed to 100 MHz, so it may serve as an additional output to

those available on the front panel.

REF IN This SMB connector accepts a 10MHz, TTL level reference signal.

The external reference input is available for those applications re-

quiring a better accuracy and stability than that provided by the ref-

erence used by the 3155. The reference input is active only after

selecting external reference source mode.

Operating Modes

The 3155 can be programmed to operate in one of four operating

modes: continuous, triggered, gated and (counted) burst. These

modes are described below.

Continuous Mode In normal continuous mode, the selected waveform is generated

continuously at the selected frequency, amplitude and offset.

Triggered Mode

In triggered mode, the 3155 circuits are armed to generate one out-

put waveform. The trigger circuit is sensitive to transitions at the

trigger input. Select between positive or negative transitions to trig-

ger the instrument. When triggered, the generator outputs one

waveform cycle and remains idle at the last point of the waveform.

The instrument can be armed to receive a trigger signal from either

the front panel connector, a software command, an internal trigger

generator, from one of 7 backplane trigger lines or from a backplane

STAR line. As an alternative to an external source, the 3155 has a

built-in trigger generator that can be programmed through a wide

range of frequencies and with 7 digits of resolution.

The trigger signal, whether it comes from the front panel, backplane

or from a software command, has to pass through some electrical

circuits. These circuits cause a small delay known as the system

delay. The system delay cannot be eliminated completely and must

be considered when applying a trigger signal. It defines how long it

will take from a valid trigger edge to the moment that the output re-

acts.

Gated Mode In gated mode, the 3155 circuits are armed to generate output

waveforms while a gating signal is present. Unlike triggered mode,

gated mode is level sensitive. When the gating signal goes low, the

waveform at the output connector is first completed and the output

reverts to an idle state. The idle amplitude level, after the gating sig-

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