FLUKE 282-U User Manual for the Fluke 282-U Arbitrary Waveform Generator and Manager, 40 MS/s, 2 Channel

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281, 282, 284

Users Manual

UTILITY screen. Refer to chapter 14, System Operations from the Utility Menu for

additional information.

REF CLOCK I/O SETUP

input

output

phase lock slave

Repeated presses of the phase lock soft-key toggle between master and

slave.

The slave is set to slave. Setting the slave generator to phase lock slave

forces the slave’s mode to continuous and defaults all the SYNC OUT outputs to phase

lock. Only one of the SYNC OUTs is needed for inter-generator synchronization; the

others may be reset to other functions if required. The phase relationship between the

slave and the master is set on the inter-channel set-up screen of the slave, accessed by

pressing the INTER CHannel key.

mode: indep

phase: +000.0º

(actual: +000.0º

status: off view

The phase of the slave generator is set by adjusting the phase of the master channel on the

slave generator’s inter-channel set-up screen exactly as described above for phase setting

between the channels of a multi-channel instrument. The same section also covers the set-

up for the phase(s) of the slave channel(s) on the slave generator.

When a single-channel generator (which has no inter-channel set-up key or screen) is the

slave, its phase is set using the TRIGGER/GATE SETUP screen. The Trigger Phase

section of the Triggered Burst and Gate chapter covers this process.

The convention adopted for the phase relationship between generators is the same as that

used between channels, i.e. a positive phase setting advances the slave generator with

respect to the master and a negative setting delays the slave generator. The status of the

slave generator on the inter-channel set-up screen must be set to on (this is automatic

on a single channel instrument).

Hardware delays become increasingly significant as frequency increases causing

additional phase delay between the master and slaves. However, these delays can be

largely nulled-out by backing off the phase settings of the slaves.

Typically these hardware delays are as follows:

DDS waveforms: <± 25 ns <1° to 100 kHz

Clock Synthesized waveforms: <300 ns <1° to 10 kHz.

Clearly a multi-channel generator gives much closer inter-channel phase-locking and is

the recommended method for up to 4 channels.

13-6

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FLUKE 282-U Arbitrary Waveform Generator and Manager, 40 MS/s, 2 Channel