FLUKE 284-U User Manual for the Fluke 284-U Arbitrary Waveform Generator and Manager, 40 MS/s, 4 Channel

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281, 282, 284

Users Manual

The source soft-key steps the modulation choice between off, external and

CHx where x is the number of the previous channel.

With CHx selected the modulation can be switched between AM and SCM with

alternate presses of the type soft-key.

When AM is selected the screen has an additional soft-key labeled depth; selecting

this key permits the modulation depth to be set directly from the keyboard or by the

rotary control.

Warnings are given when either a modulation depth or output amplitude change has

caused clipping; the new setting is accepted but one of the two parameters must be

changed to eliminate clipping.

When SCM is selected the screen has an additional soft-key labeled level; selecting

this key permits the peak carrier output level to be set directly from the keyboard or by

the rotary control. The maximum output level that can be set is 10 V p-p.

When internal SCM is selected for a channel both the amplitude control of that channel

and of the previous channel (which is the modulation source) are disabled. The

AMPLITUDE set-up screen of the channel being modulated shows the message

fixed by SCM. The AMPLITUDE screen of the previous channel shows the

message Set by CHx mod. and its status screen shows the message

x to indicate

that it is being used as a source for channel x.

Internal modulation can not be used with internal or external sum.

11-4

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FLUKE 284-U Arbitrary Waveform Generator and Manager, 40 MS/s, 4 Channel