Fluke 287 Instrucciones de instalación y funcionamiento

Measuring ac and dc voltage

and current—you’ve got that. But

what about the other features

your DMM has—do you ever

use them? Min/Max/Avg is an

especially useful, but often over

looked function of your tool.

occurred, based on the start of

the monitoring process. The

actual start time for the Min Max

session is also displayed so it

is relatively easy to determine

exactly when the signal changes

have occurred.

Knowing the precise timing of

the highest and lowest signal

variations tells you exactly when

unusual events may have taken

place and gives you critical

insight to the stability of the

signal or the system being

evaluated. This can be a real

asset and a time saver as a

troubleshooting tool, if you’re

looking for intermittent or

unusual system performances that

happen when you’re not there.

Application Note

Under-utilized functions

on your DMM

Min/Max/AVG

Many of the higher performance

digital multimeters contain a

min-max recording function

which allows the user to capture

a wide range of signal anoma-

lies, such as multiple cycle sags

or swells, unexpected signal

ﬂuctuations, or other types of

unattended monitoring of a signal

over time. The function works

by sampling the input signal

approximately every 100 ms or

longer and can be applied to all

primary meter functions (volts,

amps, etc).

With Min/Max/Avg turned on,

the meter will capture, and

temporarily hold, the highest and

lowest signal levels measured by

the meter. In addition, the meter

will maintain a running average

of the signal levels measured

during the monitoring process.

The average reading is useful for

smoothing out noisy signals,

estimating the percent of time a

circuit is active, and determining

the overall level of instability for

the monitored signal.

Timestamp

Along with these captured levels,

some dmm’s such as the Fluke-

287 and 289, have an elapsed

time clock, which timestamps

the highest, lowest and average

values. The timestamp tells you

exactly when these readings

ENEN

Recommended procedure for use

First and foremost, read the instruction manual and follow

all safety precautions and use safe work practices.

Using MIN-MAX-AVG

function for signal

monitoring

1. Select the appropriate meter

function for the measurement

to be monitored

2. Attach the test probes to the

test points using suitable

alligator clips or other connec-

tion devices that will allow for

a solid connection while the

monitoring process is in

progress.

3. Once the leads are attached to

the signal to be monitored,

push the MIN MAX pushbutton

once.

4. This starts the recording

process. The Min Max symbol

will appear.

The monitoring process is now

underway and the meter is ready

to capture and display any

changes to the signal which may

occur during the Min-Max

recording process.

Displayed readings

As you can see from the image

because the 287/289 has a large

easy to read dot matrix display all

critical information is easily seen

in the meter’s display, the current

date and time, the maximum,

average and minimum values

along with the elapsed time of

each and the actual start time of

the process.

Once the monitoring process is

complete, but before disconnect-

ing the test leads from the circuit,

press the F4 Stop pushbutton.

This retains the recorded values

for viewing and saving. If the

user doesn’t press the F4 Stop

pushbutton before disconnection

of the leads the Minimum value

would be lost and the Average

value would be compromised.

In summary, the Min Max

record mode contained within

the Fluke 287 and Fluke 289

multimeters offer the users

another very powerful trouble-

shooting tool by allowing the

user to do unattended monitoring

while looking for unusual signal

events.

Min-Max in progress

Fluke Corporation

P.O. Box 9090

Everett, WA USA 98206

Web: www.ﬂuke.com

Fluke Europe B.V.

P.O. Box 1186

5602 BD Eindhoven

The Netherlands

Web: www.ﬂuke.eu

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 2 675 200

or Fax +31 (0)40 2 675 222

In Canada (905) 890-7600

or Fax (905) 890-6866

From other countries +1 (425) 446 -5500

or Fax +1 (425) 446 -5116

Fluke (UK) Ltd.

52 Hurricane Way

Norwich

Norfolk

NR6 6JB

United Kingdom

Tel: (020) 7942 0700

Fax: (020) 7942 0701

E-mail: industrial@uk.ﬂuke.nl

Web: www.ﬂuke.co.uk

Printed in the Netherlands 08/2007 Data subject to alteration

without notice.

Pub id: 11279-eng

Fluke. Keeping your world

up and running.®

ENEN

2 Fluke Corporation Min/Max/Avg – An under-utilized function on your DMM

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