Racal Instruments 3155 Spezifikationen PDF herunterladen (Seite 24)

User Manual 3155

Overview 1-11

The FM function modulates the 3155 sample clock frequency. You

can frequency modulate the output either with built-in waveforms, or

by downloading complex waveforms into FM modulation memory.

Using DDS technology, the modulation is wide band and extremely

linear. FM can be used in continuous, triggered and gated modes.

The 3155 can generate two types of frequency modulation: 1) Stan-

dard and 2) Arbitrary. In standard mode, the modulating waveform is

selected from a built-in library of 4 standard waveforms: sine, trian-

gle, square and ramped. In arbitrary mode, the modulating signal is

downloaded into FM modulation waveform memory. There are

100,000 points allocated specifically for arbitrary memory that are

used for arbitrary frequency modulation.

Output Type

The 3155 can output three types of waveforms: standard (Fixed), ar-

bitrary (User) and sequenced waveforms. A description of the vari-

ous waveform types that the instrument can generate is given below.

Standard (FIXED)

Waveforms

The 3155 must pre-load its memory before it can generate wave-

forms. On power up, the waveform memory has no specific data.

The sine waveform, being the default waveform at power on, is com-

puted and loaded into waveform memory as part of the reset proce-

dure.

Standard waveforms are using the same start address. Every time

that a new waveform is selected, there is some minimal time for the

processor to compute and download the data to the memory.

The 3155 can be programmed to output one of nine standard wave-

form shapes: sine, triangle, square, pulse/ramp, sine(x)/x pulse,

gaussian pulse, rising/decaying exponential pulse, noise and DC.

There are some parameters associated with each waveform, which

modify the shape of the waveform to better suit your needs. For ex-

ample, different start phases for the sine waveform can be pro-

grammed for each channel to create phase offsets between two or

more instruments.

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Racal Instruments 3155 Spezifikationen Seite 24