®
77/75/23/21
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 probes to a voltage source when the test leads are plugged into the 10 A or 300 mA input jack.
∙Never apply more than the 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
Read First: Safety Information
Dangerous Voltage May Be Present
Double Insulation
Overvoltage Installation Category per IEC 1010:
CAT II
CAT III
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.
PN 650512 August 1997 Rev.2, 7/98
ã 1997, 1998 Fluke Corporation. All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies
Input Jacks
Milliamp
Amp
V
600V CAT 
1000V CAT 
FUSED 
Volts, Ohms,
Diode Test
Common
Terminal
hc1f.eps
See Specifications for overload protection.
Autorange
The meter defaults to autorange when you turn on the meter.
Manual Range
Manual ranging is available in V ac, V dc, ohms, A ac, and A dc.
MANUAL
MANUAL
RANGE 
RANGE 
Momentary
CAT 
CAT
+
_
hc11f.eps
To return to autorange, press 
for 1 second or turn the rotary switch.
Automatic Touch Holdâ Mode
W Warning
To avoid electric shock, do not use the Touch Holdâ mode to determine if a circuit with high voltage is dead. The Touch Holdâ mode will not capture unstable or noisy readings.
The Touch Holdâ mode automatically captures and displays stable readings for all functions.
HOLD
AUTO HOLD |
HOLD |
HOLD |
RANGE |
RANGE |
RANGE |
Momentary
V |
|
V |
|
V |
|
|
|
|
|
|
CAT |
|
|
|
|
|
CAT |
+ |
_ |
+ |
_ |
+ |
_ |
|
|
|
|
Single Beep |
|
|
|
|
|
|
hc4f.eps |
When the meter captures new input, it beeps and a new reading is displayed.
Note
Stray voltages can produce a new reading.
To exit the Touch Holdâ mode, press 
momentarily 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.
hc15f.eps
Standby
If the meter is on but is inactive for an hour (20 minutes in diode test), the display goes blank and displays four bar graph segments. To resume operation, turn the rotary switch or press a button.
AC and DC Voltage (K L mL)
Volts AC |
Volts DC |
Millivolts DC |
RANGE 
RANGE
V V
mV
RANGE
|
CAT |
|
CAT |
|
CAT |
|
CAT |
|
CAT |
|
CAT |
+ |
_ |
+ |
_ |
+ |
_ |
|
|
|
|
|
hc3f.eps |
Resistance (e)
Turn off the power and discharge all capacitors. An external voltage across a component will give invalid resistance readings.
RANGE
CAT 
CAT
+
_
hc7f.eps
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