Fluke 26 III, 79 III User Manual
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Series III Multimeter
Instruction Sheet
W
Read First: Safety Information
• Never use the meter if the meter or test leads look damaged.
• Be sure the test leads and switch are in the correct position
for the desired measurement.
• Never measure resistance in a circuit when power is applied.
• Never touch the probe to a voltage source when the test
leads are plugged into the 10 A or 40 mA input jack.
• Never apply more than rated voltage between any input jack
and earth ground.
• Be careful when working with voltages above 60 V dc or 30
V ac rms. Such voltages pose a shock hazard.
• Keep your fingers behind the finger guards on the test
probes when making measurements.
WWarning
To avoid false readings, which could lead to
possible electric shock or personal injury, replace
the battery as soon as the battery indicator M
appears.
®
Symbols
W
Y
T
Overvoltage Installation Category per IEC 1010:
CAT II
CAT III
PN 687589 August 1997 Rev. 2, 4/98
1997, 1998 Fluke Corporation. All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies.
Read First: Safety Information
Dangerous Voltage May Be Present
Double Insulation
Typical locations include main wall outlets, local
appliances, and portable equipment.
Typical locations include switches in the fixed
installation and equipment for industrial use
permanently connected to the fixed installation.
Input Jacks
Milliamp
Amp
FUSED
600V
1000V
CAT
CAT
V
Volts, Ohms,
Diode Test
Common Terminal
See Specifications for overload protection.
Ranging
The meter defaults to autorange when you turn on the meter.
Manual ranging is available in V ac, V dc, Hz, ohms,
capacitance, A ac, and A dc.
MANUAL
RANGE
Momentary
MANUAL
RANGE
CAT
CAT
+
_
jo1f.eps
jo11f.eps
To return to autorange, press for 1 second or turn the
rotary switch.
Bar Graph
The bar graph shows readings relative to the full scale value of
the displayed measurement range and indicates polarity.
0 2001 400 2 600 3800 41000
+
_
mV
jo19f.eps
Automatic Touch Hold
Mode
W Warning
To avoid electric shock, do not use the Touch
Hold
mode to determine if a circuit with high
voltage is dead. The Touch Hold
capture unstable or noisy readings.
The Touch Hold mode automatically captures and displays a
stable voltage reading.
mode will not
HOLD
HOLD
HOLD
RANGE
HOLD HOLD
RANGE
RANGE
V V V
CAT
+
__
CAT
CAT
+
CAT
CAT
+
_
Single Beep
jo4f.eps
When the meter detects a new input, it beeps and displays a new
reading.
Stray voltages can cause the meter to display a new reading.
To exit the Touch Hold
mode, press the yellow key a second
time or turn the rotary switch.
Smoothing Displayed Readings
Smoothing displays the average of eight readings. When the
input signal changes rapidly, smoothing makes the digital display
readings more stable. Smoothing does not work in continuity, LoOhms, and capacitance.
To select Smoothing, press the yellow key while turning on the
meter.
Standby
If the meter is on but is inactive for an hour (20 minutes in diode
test), the screen only displays four bar graph segments. To
resume operation, turn the rotary switch or press a button.
AC and DC Voltage
Volts AC
RANGE
V
CAT
+
__
(K L mL)
Volts DC
RANGE
V
+
Millivolts DC
RANGE
mV
CAT
CAT
+
CAT
CAT
_
jo3f.eps
In the mV dc function, the meter defaults to 400 mV. To enter the
40 mV range, press
Frequency
(Hz)
momentarily.
The bar graph indicates the ac voltage present.
W Warning
To avoid electric shock, disregard the bar graph
when frequency is > 1 kHz. If the frequency of
the measured signal is > 1 kHz, the bar graph
voltage is unspecified.
Hz
Hz
+
_
RANGE
+
mV
CAT
CAT
_
jo20f.eps
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