Fluke III Series User manual

70/73 English Instruction Sheet
Page 1
®
70/73
Series III Multimeter
Instruction Sheet
WRead First: Safety Information
To ensure that the meter is used safely, follow these instructions:
•Never use the meter if the meter or test leads look damaged.
•Be sure the test leads and rotary 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.
•To avoid damage or injury, never use the meter on circuits that
exceed 4800 volt-amps.
•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.
Warning
To avoid false readings, which could lead to
possible electric shock or personal injury, replace
the battery as soon as the battery indicator (N)
appears.
Symbols
WRead First: Safety Information
ZManual Range or Automatic Touch Holdmode
TDouble Insulation
CAT II Overvoltage Installation Category per IEC 1010-1.
Typical CAT II locations include main wall outlets,
local appliances, and portable equipment.
PN 650454 August 1997 Rev.2, 2/98
1997, 1998 Fluke Corporation. All rights reserved. Printed in U.S.A.
All product names are trademarks of their respective companies.

70/73 English Instruction Sheet
Page 2
Input Jacks
300
mA
10A
COM
FUSED
V
!
Milliamps
Amps Volts, Ohms, Diode Test
Common Terminal
600V
70
70
hr2f.eps
See Specifications for overload protection.
Pushbutton
Use the pushbutton to either select a fixed range or put the meter
in the Automatic Touch Holdmode.
Autorange
The meter defaults to autorange when first turned on.
Manual Range
Manual ranging is available in V ac, V dc, ohms, A ac, and A dc.
Momentary
+_
V
hr14f.eps
To return to autorange, press Rfor 1 second or turn the
rotary switch.

70/73 English Instruction Sheet
Page 3
Automatic Touch Hold  Mode
WWarning
To avoid electric shock, do not use the Touch Hold
to determine if a circuit with high voltage is dead.
The Touch Holdmode will not capture unstable or
noisy readings.
The Touch Holdmode automatically captures and displays
stable readings. Press Rfor 2 seconds while turning the
meter on.
2 seconds
+_
V DC V DC
H
_+_
V DC
single
beep
V V V
hr3f.eps
When the meter captures a new input, it beeps and a new
reading is displayed. To manually force a new measurement to
be held, press R.
Note
Stray voltages can produce a new reading.
To exit the Touch Holdmode, turn the meter off.
Bar Graph
The bar graph shows readings relative to the full scale value of a
displayed measurement range and indicates polarity.
hr16f.eps

70/73 English Instruction Sheet
Page 4
Standby
If the meter is on but is inactive for an hour (20 minutes in diode
test), the screen goes blank and displays selected bar graph
segments. To resume operation, turn the rotary switch or press
R.
AC and DC Voltage (KLmL)
+_+_
V AC V DC
+_
Volts AC Volts DC Millivolts DC
V
V
V
mV
hr4f.eps
Resistance (e)
Turn off the power and discharge all capacitors. An external
voltage across a component will give invalid resistance readings.
+_
k
hr6f.eps

70/73 English Instruction Sheet
Page 5
Diode Test (G)
Forward Bias
Single Beep
Reverse Bias
Shorted
Open or
Good Diode
Bad Diode
+_
+_
Bad Diode
+_
Good Diode
+_
hr7f.eps

70/73 English Instruction Sheet
Page 6
Continuity Test ( R)
+_+_
hr5f.eps
If continuity exists (resistance < 210 Ω), the beeper sounds
continuously. The meter beeps twice if it is in the Touch Hold
mode.
Current (?A)
WWarning
To avoid injury, do not attempt a current
measurement if the open circuit voltage is above the
rated voltage of the meter.
To avoid blowing an input fuse, use the 10 A jack until you are
sure that the current is less than 300 mA.
Turn off power to the circuit. Break the circuit. (For circuits of
more than 10 amps, use a current clamp.) Put the meter in series
with the circuit as shown and turn power on.
DC
+
_
1
4
3
2
V
A
70
hr8f.eps

70/73 English Instruction Sheet
Page 7
Holster
The snap-on holster absorbs shocks and protects the meter and
comes with a Flex-Stand. To protect the front of the meter, put
the meter face down in the holster.
hr15f.eps
Maintenance
WWarning
To avoid electric shock, remove the test leads
before opening the case, and close the case before
using the meter. To prevent fire and possible arc-
flash, use fuses with ratings shown on the back of
the meter.
Caution
To avoid damaging meter components, lift up the
end of the battery as shown. To avoid
contamination or static damage, do not touch the
circuit board without proper static protection.

70/73 English Instruction Sheet
Page 8
Internal Fuse Test
300 mA
Ω
5-8 Ω
<0.5
OK OK
10 A
OK
70
OK
hr10f.eps
Battery and Fuse Replacement
Note
Before opening the case, make sure the test leads are
removed and the rotary switch is turned to OFF.
F1 F2
70
hr11f.eps

70/73 English Instruction Sheet
Page 9
Cleaning
To clean the meter, use a damp cloth and mild detergent; do not
use abrasives or solvents on the meter.
Service and Parts
For service information in the U.S.A. and Canada, call 1-800-44-
FLUKE (1-800-443-5853), in Europe, 31 40 267 8200, from other
countries, 1-425-356-5500.
Item Description Fluke
PN Quan.
BT1 Battery, 9 V, NEDA 1604/IEC 6F22, or
NEDA 1604A/IEC 6LR61 696534 614487 1
F1* Fuse, F630 mA, 250 V, Min Interrupt
Rating 1500 A, IEC 127-1 740670 1
F2* Fuse, F11 A, 1000 VAC/DC, Min
Interrupt Rating 17 kA 943118 1
* For safety, use exact replacement
Specifications
Accuracy is specified for a period of one year after calibration, at
18°C to 28°C (64°F to 82°F) with relative humidity to 90%. AC
conversions are ac-coupled, average responding, and calibrated
to the RMS value of a sine wave input.
Accuracy specifications are given as:
±([% of reading] + [number of least significant digits])
Maximum Voltage Between
any Terminal and Earth
Ground
600 V
Display Digital: 3,200 counts, updates 2.5/sec
Analog: 31 segments, updates 25/sec
Response Time of Digital
Display V ac < 2 s
V dc < 1 s
Ω< 1 s to 320 kΩ, < 2s to 3.2 MΩ,
< 10 s to 32 MΩ
Operating Temperature 0°C to 50°C
Storage Temperature -40°C to 60°C
Temperature Coefficient 0.1 x (specified accuracy)/°C
(<18°C or >28°C)

70/73 English Instruction Sheet
Page 10
Electromagnetic Compatibility
in RF field of 3 V/m on all
functions except MΩ
Total accuracy = Specified accuracy
plus +2.0% of range for all functions
except:
320.0 mV range: total accuracy =
specified accuracy + 1.0% of range
320.0Ωrange: total accuracy =
specified accuracy + 8% of range
Relative Humidity
except 32 MΩRange:
32 MΩRange only:
0% to 90% (0°C to 35°C)
0% to 70% (35°C to 50°C)
0% to 80% (0°C to 35°C)
0% to 70% (35°C to 50°C)
Altitude Operating: 2000 meters
Storage: 12,000 meters
Battery Type 9 V, NEDA 1604 or 6F22 or 006P,
or NEDA 1604A or 6LR61
Battery Life 2000 hrs typical with alkaline
1600 hrs typical with carbon zinc
Continuity Beeper 4096 Hz
Shock, Vibration per MIL-T-PRF 28800F Class III,
Sinusoidal, Non Operating
Size (H x W x L) 2.8 cm x 7.5 cm x 16.6 cm
(1.12 in x 2.95 in x 6.55 in)
Weight 340 g (12.0 oz)
Safety 600 V CAT II per ANSI/ISA S82.01-
1994, EN 61010-1: 1993, CSA C22.2
No 1010.1-92, UL 3111-1.
EMC Regulations EN 61326-1: 1997
Certifications/Listings

70/73 English Instruction Sheet
Page 11
Function Range Accuracy
0L 3.200 V, 32.00 V, 320.0 V
600 V ±(0.3%+1) ±(0.4%+1)
mL320.0 mV ±(0.3%+1)
K(45 to 500 Hz, 3.2V
range. Other ranges 45
to 1 kHz)
3.200 V, 32.00 V,
320.0 V, 600 V ±(2%+2) ±(2%+2)
e
320.0 Ω
3200 Ω, 32.00 kΩ,
320.0 kΩ, 3.200 MΩ
32.00 MΩ
±(0.5%+2)
±(0.5%+1)
±(0.5%+1)
±(2%+1)
G R
2.0 V ±(1% typical)
Function Range Accuracy Typical
Burden
Voltage
?(45 Hz to
1 kHz)
(73 only)
32.00 mA, 320.0 mA
10.00 A * ±(2.5%+2) ±(2.5%+2) 6 mV/mA 50 mV/A
A
(73 only) 32.00 mA, 320.0 mA 10.00 A * ±(1.5%+2) ±(1.5%+2) 6 mV/mA 50 mV/A
* 10 A continuous, 20 A for 30 seconds maximum.

70/73 English Instruction Sheet
Page 12
Overload protection for all functions and ranges: 600 V.
Function Input Impedance (Nominal)
L, mL, K>10 MΩ, <50 pF
Common Mode
Rejection Ratio (1
kΩUnbalanced)
Normal Mode
Rejection
L, mL>120 dB at dc, 50 Hz,
or 60 Hz >60 dB at 50 Hz or 60 Hz
K>60 dB dc to 60 Hz
Open Circuit Test
Voltage Full Scale Voltage
To 3.2 MΩ32 MΩ
e<3.1 V dc
<2.8 V dc (typical) <440 mV dc <420 mV dc
(typical)
<1.4 V dc
<1.3 V dc
(typical)
GR<3.1 V dc 2.0 V dc
Typical Short Circuit Current
e400 µA
GR500 µA
GVFTypical Test Current
0.0 V
0.6 V
1.2 V
2.0 V
0.5 mA
0.4 mA
0.3 mA
0.1 mA

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