Application Note

Making electrical measurements with
the T5
V
oltage measurements
1. Turn the selector to the V. The meter automati-
cally selects the correct internal circuitry
depending on the type of voltage being
measured. For volts dc and ac, the T5-600 is
rated for 600 V CAT III and the T5-1000 is rated
for 1,000 V CAT III or 600 V CAT IV.
2. Touch the probe tips to the circuit across the
load or power source in parallel to the circuit.
Either probe can be fitted into the back of the
meter for easy two-handed operation.
3. Record the reading, making note of the units of
measurement
.
4. If you can’t read the display, press the HOLD
button to freeze it, remove the meter from the
live circuit, and then check the value.
Resistance measurements
1. Turn off power in the circuit to be tested.
2. Turn the selector to
Ω.
3. Touch the probe tips across the designated
component or portion of the circuit.
4. Record the reading.
Continuity
Continuity is a quick go/no-go resistance test that
distinguishes between an open and closed circuit.
The T5 continuity tester beeps when it detects a
closed circuit (resistance less than 25 Ω) — no
reading is required — and when it encounters an
open circuit (resistance greater than 1000
Ω), “OL”
appears in the display.
Current measurements
1. Turn the selector to A.
2.
Plac
e the jaw
s of the meter around the c
onduc-
tor. The conductor should be no larger than 0.5
in. diameter.
3.
The conductor should pass through the sensor
zone (noted by the circle at the base of the jaw
opening) and parallel to the axis of the slotted
opening. In a situation where checking for a
“hot” conductor is more important than the
absolute ampere reading, exact placement of the
jaws around the conductor is less important.
4. View the reading. Note that the HOLD function
can be used on all measurements as necessary.
Guidelines for working safely
High voltages and currents present in electrical power sys
-
tems can cause serious injury or death by electrocution or
burns. Only trained, experienced electrical or maintenance
technicians should test or modify electrical systems.
•
Never work alone.
•
Use caution when working above 30 Vac rms, 42 Vac
peak, or 60 V dc.
•
Do not use the tester around explosive gas, vapor, or
dust.
•
Do not use a tester if it is damaged or operating abnor-
mally. Before each use inspect the tester and tester
leads. Make sure the battery door is closed and latched.
Look for cracks, missing plastic, exposed metal, or dam-
aged insulation. Replace damaged test leads before
using the tester. Verify its operation by measuring a
known voltage.
•
Replace batteries as soon as the low battery indicator in
the display appears.
•
Do not apply more than the rated voltage, as marked on
the tester, between terminals or between any terminal
and earth ground.
•
Use appropriate safety equipment such as safety glasses,
insulated gloves, mats, etc.
•
When using probes, keep finger behind the finger
guards.
•
Always connect the common lead before connecting the
live lead. Always disconnect the live lead first.
•
Make certain that all power has been turned off, locked,
and tagged out in any situation where direct contact
with circuit components is possible.
•
Do not use instruments on applications for which they
are not intended. Also be aware that if equipment is
used in a manner not specified by the manufacturer, the
protection provided by the equipment may be impaired.
•
Refer meter servicing to qualified personnel.
•
Clean the meter case with a damp cloth and detergent.
D
o not use abrasives or solvents
.
3 Fluke Corporation When things are tight, reach for the Fluke T5
Fluke Corporation
PO Box 9090, Everett, WA USA 98206
Fluke Europe B.V.
P
O Box 1
1
86, 56
02 B
D
Eindhoven, The Netherlands
For more information call:
In the U
.S
.A
. (8
00) 443-5853 or
Fax [phone]
In Europe/M-East/Africa (31 40) 2 675 200 or
F
ax (31 40) 2 675 222
In Canada (8
00) 36-
F
LU
KE or
Fax [phone]
From other countries [phone] or
Fax [phone]
W
eb ac
cess: http://www.fluke.com
©2004 Fluke Corporation
. All rights reser
ved
.
Printed in U.S.A. 10/2004 2402573 A-US-N Rev A
Fluke. Keeping your world
up and running.