Fluke 289 Application Note

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Application Note

The ultimate meter for

the ultimate electrician/

industrial technician

From the Fluke Digital Library @ www.fluke.com/library

Most technicians have moments when the

pressure to fix too many things at once

pushes standards like electrical safety

aside. Fortunately, a good all-purpose digi-

tal multimeter (DMM) can contribute a lot,

to both operator safety and efficient job

performance, without being complicated

to use.

When Fluke designed the new 289

DMM, it set out to make the ultimate

meter for industrial technicians. Extra,

automatic safety features like ghost volt-

age detection, easier logging with better

display for on-the-spot troubleshoot-

ing, filters for VFD output readings, and

onscreen help. All features that industrial

techs need, but all made very easy to use,

so that they get used, and really do make

a difference on the job.

Key features and

applications of the

Fluke 289 DMM

Saving, recording and

TrendCapture

The Fluke 289 DMM provides the

usual measurement functions,

such as V ac, V dc, ohms, capaci-

tance, A ac and A dc. And for all

of these, the ability to have the

meter monitor a circuit while the

technician is busy elsewhere

is probably the most valuable of

them all.

For example, a technician can

set the meter up to record ac

voltage on a circuit of concern

and then exercise loads at a

remote location on that circuit.

Returning to the meter, he can

then view a TrendCapture dis-

play of the circuit’s performance

during the exercise. The saved

data appears as a stripchart-like

recorder display on the face of

the meter.

This kind of logging helps

evaluate switching events and

sudden load changes. If you

need a permanent record of the

process, you can save the results

in memory for later transfer to

a computer. The big difference

between the Fluke 289 and

other DMM logging systems is

this ability to instantly see the

history of a test, on screen, while

still on site.

The Fluke 289 can also iden-

tify and save multiple recording

sessions on the meter, without

returning to the shop to down-

load the results each time. That

means the technician can con-

duct several of these tests on a

single tour, making more efficient

use of his time.

50 Ω (high power low ohms)

There are two features of this

new, 50 Ω function that should

be of particular interest to an

industrial electrician.

The first is the ability to mea-

sure low resistances with 0.001

ohm resolution. To do this with

a two-wire measuring system,

short the test leads together

and use the REL mode to zero

out test lead resistances. Then,

make firm connections to the test

points, such as the stator wind-

ing of an induction motor, and

read the winding resistance. By

comparing the resistances of the

2 Fluke Corporation The ultimate meter for the ultimate electrician/industrial technician

stator windings, you can uncover

internal connection problems

that may contribute to reduced

motor performance or impending

failure.

The second is the fact that the

measuring circuit in this function

uses a much higher measure-

ment current than normal ohms

functions, with an available volt-

age up to 20 V. For the industrial

technician, who often works in

high noise environments, this

means that the low resistance

readings will be more accurate in

the presence of that noise, which

may easily appear on the circuit

of concern.

LoZ ac volts

This safety

and accu-

racy function

clearly identi-

fies live con-

ductors among

those showing

‘ghost volt-

age’—which

appears on

unconnected

wiring in close

proximity to live conductors.

The LoZ feature provides a

load for the circuit that collapses

ghost voltage to a zero read-

ing, indicating that the conduc-

tor would be safe to work with.

The feature also automatically

displays the ac voltage of a live

circuit, as well as any dc volt-

age, in a dual display presen-

tation. Besides the everyday

safety of reliable measurements,

LoZ is also useful for monitor-

ing residual dc voltage while

troubleshooting electronic power

controls such as those used for

theatrical stage lighting or motor

drives.

Low pass filter

The V ac and mV ac functions of

the Fluke 289 DMM offer a low

pass filter feature that reduces

the ac measurement bandwidth

to one kHz and below. Using

this feature, you can monitor the

output voltage and frequency of

an adjustable speed motor drive

accurately, while rejecting the

higher frequency output voltages

that often confuse lesser meters.

For example: Sometimes a

drive output smoothing filter is

installed to protect a motor from

those higher frequency voltage

components that can result in

damaging high peak voltages.

In that kind of setup, measur-

ing the unfiltered voltage at the

motor can insure that the filter

is effective, by showing that the

high frequency voltages are sig-

nificantly reduced in value. That

is indicated when the unfiltered

reading nearly equals the filtered

reading.

The (i) info button

With all the added features and

functions in the Fluke 289, the

new ‘(i) info’ button provides

a convenient alternative to the

need to carry a manual or refer-

ence card around. To use this

new feature, select the desired

function, highlight it in the

menu, and press ‘(i) info’ to see

a brief description of the func-

tion and its use. It’s effectively

a manual that’s automatically

turned to the right page as you

move from measurement to mea-

surement. This feature actually

suggests uses for several of the

new features and how to apply

them. The “i”

info button is

also multilin-

gual; you can

change the

language.

So, besides being a meter that

can be your ultimate helper, the

new Fluke 289, with all of its

capabilities and new features,

is also the tool for the industrial

technician who wants to better

understand the many processes

he or she may deal with. Using

this meter, you can not only test

for the usual voltages, currents,

and resistances encountered in

your daily work, but you can

explore machine and circuit

operations in more depth, learn-

ing as you go.

Fluke Corporation

PO Box 9090, Everett, WA USA 98206

Fluke Europe B.V.

PO Box 1186, 5602 BD

Eindhoven, The Netherlands

For more information call:

In the U.S.A. (800) 443-5853 or

Fax (425) 446-5116

In Europe/M-East/Africa +31 (0) 40 2675 200 or

Fax +31 (0) 40 2675 222

In Canada (800)-36-FLUKE or

Fax (905) 890-6866

From other countries +1 (425) 446-5500 or

Fax +1 (425) 446-5116

Web access: http://www.fluke.com

©2007 Fluke Corporation. Specifications subject

to change without notice. Printed in U.S.A.

11/2007 3184596 A-EN-N Rev A

Fluke. Keeping your world

up and running.®