Application Note

2 Fluke Corporation Min/Max/Avg – An under-utilized function on your DMM
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. [phone] or
Fax [phone]
In Europe/M-East/Africa [phone] or
Fax [phone]
In Canada (800)-36-FLUKE or
Fax [phone]
From other countries [phone] or
Fax [phone]
Web access: http://www.fluke.com
©2007 Fluke Corporation. All rights reserved.
Specifications subject to change without notice.
Printed in U.S.A. 6/2007 2674014 A-EN-N Rev C
Fluke. Keeping your world
up and running.
®
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 record-
ing 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