Fluke 12B/18 Instruction Sheet

®

12B/18

MultiMeter

Instruction Sheet

P

To ensure that the meter is used safely, follow these instructions:

• Do not use the meter if the meter or test leads appear damaged, or if

• Disconnect the live test lead before disconnecting the common test

• When using the probes, keep your fingers behind the finger guards on

• Do not use the Model 12B’s Automatic Selection mode to measure

• Turn off power to the circuit under test before cutting, desoldering, or

• Do not apply more than 600V rms between a meter terminal and earth

Read First: Safety Information

you suspect that the meter is not operating properly.

lead.

the probes.

voltages in circuits that could be damaged by this mode’s low input
impedance (≅2 kΩ).

breaking the circuit. Small amounts of current can be dangerous.

ground.

• Use caution when working with voltages above 60V dc or 30V ac rms.
Such voltages pose a shock hazard.

To avoid false readings, which could lead to possible electric shock
or personal injury, replace the battery as soon as the battery
indicator (U) appears.

PN 602000 June 1996 Rev.3, 1/99

© 1996,1998,1999 Fluke Corporation, All rights reserved. Printed in U.S.A.

WWarning

Symbols

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RANGE

VDC
VAC

Press button.

Press button to switch between modes.

Double insulation.

Not applicable to identified model.

Manual ranging mode.

ag14i.eps

Automatic Range Selection

The meter defaults to autoranging when you turn it on.

Manual Range Selection

M

RANGE

RANGE

To return to autoranging, press for
2 seconds, or change the measurement

CAT III

COM

600V

+

mode.

RANGE

ag10i.eps

Standby Mode

If the meter is ON but inactive and not connected to voltage for more than
45 minutes, the display goes blank to preserve battery life. To resume
operation, press any button or turn the rotary switch.

DC and AC Voltage

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For Model 12B, refer also to Automatic Selection.

Volts dc Volts ac

Input Impedance ≅10 MΩ Input Impedance ≅5 MΩ

VDC
VAC

DC AC

V

600V

COM

+

Continuity and Resistance

For Model 12B, refer also to Automatic Selection.

Continuity Resistance

VDC
VAC

COM

V

600V

+

ag01i.eps

Mk

LOW IMPEDANCE

AUTOMATIC
SELECTION

CAT III

600V

COM

+

<25Ω

Detects shorts and opens ≥250 µS.

12B Only

LOW IMPEDANCE LOW IMPEDANCE

AUTOMATIC
SELECTION

CAT III

600V

COM

LOW IMPEDANCE

AUTOMATIC
SELECTION

COM

AUTOMATIC
SELECTION

CAT III

600V

++

ag02i.eps

Diode Test

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Good Diode

VDC
VAC

LOW IMPEDANCE

AUTOMATIC
SELECTION

CAT III

600V

COM

Typical voltage
for silicon diode

12B Only

LOW IMPEDANCE

AUTOMATIC
SELECTION

LOW IMPEDANCE

AUTOMATIC
SELECTION

CAT III

+

COM

600V

+

Single beep

ag03i.eps

Bad Diode

Forward Bias Reverse Bias

12B Only

LOW IMPEDANCE

AUTOMATIC
SELECTION

LOW IMPEDANCE

COM

AUTOMATIC
SELECTION

CAT III

600V

+

COM

AUTOMATIC
SELECTION

CAT III

600V

+

or

Shorted Open

ag04i.eps

LIMITED WARRANTY & LIMITATION O F LIABILITY

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Each Fluke product is warranted to be free from defects in material and workmanship under
normal use and service. The warranty period is two years for Model 12B and three years for Model
18 and begins on the date of shipment. Parts, product repairs and services are warranted for 90
days. This warranty extends only to the original buyer or end-user customer of a Fluke authorized
reseller, and does not apply to fuses, disposable batteries or to any product which, in Fluke’s
opinion, has been misused, altered, neglected or damaged by accident or abnormal conditions of
operation or handling. Fluke warrants that soft war e will oper ate substantially in accordance with its
functional specifications for 90 days and that it has been properly recorded on non-defective
media. Fluke does not warrant that softwar e will be er r o r f ree or operate without interruption.

Fluke authorized resellers shall extend this warranty on new and unused products to end-user
customers only but have no authority to extend a greater or different warranty on behalf of Fluke.
Warranty support is available if product is purchased through a Fluke authorized sales outlet or
Buyer has paid the applicable international price. Fluke reserves the right to invoice Buyer for
importation costs of repair/replacement parts when product purchased in one country is submitted
for repair in another country.

Fluke’s warranty obligation is limited, at Fluke’s option, to refund of the purchase price, free of
charge repair, or replacement of a defective product which is returned to a Fluke authorized
service center within the warranty period.

To obtain warranty service, contact your nearest Fluke authorized service center or send the
product, with a description of the difficulty, postage and insurance prepaid (FOB Destination), to
the nearest Fluke authorized service center. Fluke assumes no risk for damage in transit.
Following warranty repair, the product will be ret urned to Buyer, transportation prepaid (FO B
Destination). If Fluke determines that the failure was caused by misuse, alteration, accident or
abnormal condition of operation or handling, Fluke will provide an estimate of repair cost s and
obtain authorization before commencing the work. Following repair, the product will be returned to
the Buyer transportation prepaid and the Buyer will be billed for the r epair and r et ur n t r anspor tation
charges (FOB Shipping Point).

THIS WARRANTY IS BUYER’S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF ALL
OTHER WARRANTIES, EXPRESS OR IMPLIED, I NCLUDING BUT NOT LIMITED TO ANY
IMPLIED WARRANTY OF MERCHANTABILITY OR FI TNESS FOR A PARTICULAR PURPOSE.
FLUKE SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
CONSEQUENTIAL DAMAGES OR LOSSES, I NCLUDING LOSS OF DATA, WHETHER ARISING
FROM BREACH OF WARRANTY OR BASED ON CONTRACT, TORT, RELIANCE OR ANY
OTHER THEORY.

Since some countries or states do not allow limitation of the term of an implied warranty, or
exclusion or limitation of incidental or consequential damages, the limitations and exclusions of
this warranty may not apply to every buyer. If any provision of this Warranty is held invalid or
unenforceable by a court of competent jurisdiction, such holding will not aff ect t he validity or
enforceability of any other provision.

Fluke Corporation Fluke Europe B.V.
P.O. Box 9090 P.O. Box 1186
Everett WA 5602 B.D. Eindhoven
98206-9090 The Netherlands

5/94

Continuity Capture

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(Open/Short Capture on Model 18)

To set up the meter to capture intermittent shorts and opens, turn the
switch to J, connect the leads to the circuit; then press

M

M

M.

M

M

ag12i.eps

Captures transitions longer than 250 µS.
Transitions after the first transition cause the meter to beep, but the

display does not change.
To reset the display to the current condition, press
To exit, press

M for 2 seconds, or change the measurement mode.

M.

Disabling the Beeper

To disable the beeper for all modes, hold down r for 2 seconds while

turning the meter on.

MIN MAX

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µF

(Records the lowest and highest measurements)

Automatic Selection (12B only), autoranging, and standby are disabled.
Put the meter in the proper range before entering MIN MAX.

When the reading changes more than about 50 digits, the meter gives a
short beep. When a new minimum or maximum is recorded, the meter
gives a long beep.

Enter

MIN MAX

MIN

MAX

Present Reading with

Input Change Alert

M

MIN

MAX

TM

MIN

MAX

MIN

MAX

MIN

MAX

Maximum Reading

M

MAX

M

MIN

Minimum Reading

2 sec

To Exit

ag06i.eps

MIN MAX with Elapsed Time

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µF

Records the hours and minutes between when MIN MAX was entered and
the last high and low was recorded. OL is displayed for times longer than
99:59.

To enable the MIN MAX timer, hold down

M while turning the rotary

switch from OFF to either measurement mode.

Enter MIN MAX. View

Maximum Reading Maximum Reading

Present Reading

M

MIN

MAX

MAX

M

MIN

MAX

Elapsed Time

M

MAX

MIN

MAX

MIN MIN

MIN

MAX

Minimum Reading

Elapsed Time

MM

MIN

MAX

MIN

MAX

2 sec

Minimum Reading Exit MIN MAX

Capacitance

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Turn off circuit power; then disconnect and discharge the capacitor before
measuring capacitance.

F

µ

If the capacitor requires more
discharging, diSC is displayed
while the capacitor discharges.

12B Only

LOW IMPEDANCE

AUTOMATIC
SELECTION

CAT III

600V

COM

+

+

Note correct probe polarity for
polarized capacitors.

LOW IMPEDANCE

AUTOMATIC
SELECTION

ag05i.eps

Automatic Selection

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18

M

µF

(12B only)

If a dc or ac voltage greater than about 4.5V is present across the inputs

when you are attempting to measure continuity or resistance, the meter
switches to dc or ac voltage mode.

W Warning

Repetitive transients on a dc bus will cause

k

CHEK

to
select ac volts, even though a hazardous dc voltage may
be present. To avoid a misleading display and possible
electric shock, manually select the proper volts function
for measurements on these circuits.

When dc or ac voltage is automatically selected, the meter has low input
impedance (≅2 kΩ). This low impedance, which places a moderate load
on the circuit under test, is appropriate only for measuring power supply
voltages under load. Do not use Automatic Selection to measure voltage
in circuits that could be damaged by a 2 kΩ load.

If AC detected
If DC detected

Z

Lo

Locked-Mode Functions

RANGE

Disables Automatic
Selection and locks

Meter puts 2 kΩ

meter in selected mode.

load on circuit.

LOW IMPEDANCE

AUTOMATIC
SELECTION

CAT III

600V

COM

+

or

RANGE

or

VDC
VAC

or

:
:

RANGE

RANGE

0.000 00.00 000.0 0000
2 sec

Reenables
Automatic
Selection

ag07i.eps

Maintenance

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Clean the case with a damp cloth and detergent. Do not use abrasives or
solvents.

Battery Replacement

Remove the test leads before disassembling the case.

COM

600V

+

+

ag13i.eps

Test Lead Replacement

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Y

Replace the test leads with Fluke TL-75 PN 855705 double-insulated
leads.

Service and Parts

This meter should be serviced only by a qualified service technician. To
contact Fluke, call one of the following telephone numbers:

USA and Canada: 1-888-99-FLUKE (1-888-993-5853)
Europe: [phone]
Japan: [phone]
Singapore: [phone]
Anywhere in the world: [phone]

Or, visit Fluke’s Web site at www.fluke.com.

Specifications

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Maximum Voltage
Between any Terminal
and Earth Ground

Display 3 3/4-digits, 4000 counts, updates 4/sec
Operating Temperature -10°C to 50°C (14°F to 122°F)
Storage Temperature -30°C to 60°C (-22°F to 140°F)

Temperature Coefficient 0.1 x (specified accuracy)/°C

Relative Humidity 0% to 90% (-10°C to 35°C; 14°F to 95°F)

Battery Type 9V, NEDA 1604 or IEC 6F22
Battey Life 650 continuous hours with alkaline

600V rms

indefinitely (to -40°C (-40°F) for 100 hrs)

(<18°C or >28°C; <64°F or > 82°F)

0% to 70% (35°C to 50°C; 95°F to 122°F)

450 continuous hours with carbon-zinc

Shock, Vibration 1 meter shock. Per MIL-T-28800D for a

Class 3 instrument

Size (HxWxL) 3.46 cm x 7.05 cm x 14.23 cm

(1.35 in x 2.75 in x 5.55 in)
Weight 286g (10 oz)
Safety Designed to Protection Class II

requirement of UL3111, ANSI/ISA-S82,

CSA C22.2 No 231, and VDE 0411, and

IEC 1010 overvoltage Category III (CAT

III).
EMI Regulations Complies with FCC Part 15,Class B, and

VDE 0871B.

s

Trademark of TÜV Product Services.

Complies with EN 61010-1: 1993.

Accuracy is specified for a period of one year after calibration, at 18°C to

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28°C (64°F to 82°F) with relative humidity to 90%. AC conversions are ac­coupled, average responding, and calibrated to the rms value of a sine
wave input. Accuracy specifications are given as follows:

±([% of reading] + [number of least significant digits])

Function Range Resolutio

1

1

1 mV

0.001V

00.01V

000.1V
0001V

1 mV

0.001V

00.01V

000.1V
0001V

0.1Ω

0.001 kΩ

0.01 kΩ

f

E

J

4000 mV

4.000V

40.00V

400.00V
0600V

4000 mV

4.000V

40.00V

400.00V
0600V

400.0Ω

4.000 kΩ

40.00 kΩ

Accuracy (50 to 400 hz)

n

±(1.9% + 3)
±(1.9% + 3)
±(1.9% + 3)
±(1.9% + 3)
±(1.9% + 3)

±(0.9% + 2)
±(0.9% + 2)
±(0.9% + 1)
±(0.9% + 1)
±(0.9% + 1)

±(0.9% + 2)
±(0.9% + 1)
±(0.9% + 1)

|

400.0 kΩ

4.000 MΩ

40.00 MΩ

1.000 µF

10.00 µF

100.0 µF

10000 µF

0.1 kΩ

0.001 MΩ

0.01 MΩ

0.001 µF

0.01 µF

0.1 µF
1 µF

±(0.9% + 1)
±(0.9% + 1)
±(1.5% + 3)

±(1.9% + 2)
±(1.9% + 2)
±(1.9% + 2)

≤1000 µF ±(1.9% + 2)

>1000 µF ±(10% + 90)

typical

2

ML

2.000V

0.001V

±(0.9% + 2)

1. The 4000 mV range can be entered only in manual range mode. Use the
4000 mV range with accessories.

2. The beeper is guaranteed to come on at <25Ω and turn off at >250Ω.
The meter detects opens or shorts ≥250 µs.

Function Overload

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Protection

Input Impedance (Nominal)

1

f

E

f

E

600V rms

600V rms

600V rms

600V rms

>5 MΩ <100 pF
Automatic Selection and LoZ = >2 kΩ

<200 pF (ac coupled)

2

>10MΩ <100 pF
Automatic Selection and LoZ = >2 kΩ

<200 pF

Common Mode
Rejection Ratio

2

Normal Mode

Rejection

(1 kΩ

Unbalanced)

>60 dB at dc 50
or 60 Hz

>100 dB at dc,
50 or 60 Hz

Open Circuit

>50 dB at 50 Hz or 60
Hz

Full Scale Voltage

J

L

600V rms

600V rms

Test Voltage

<1.5V dc <450 mVdc<1.5V dc

2.4-3.0V dc 2.400V dc

To 4.0 MΩ 40 MΩ

Short Circuit Current

J

L

600V rms <500 µA
600V rms 0.95 mA (typical)

1. 3 x 106 V Hz maximum

2. ≅2 kΩ input impedance up to 50V. Impedance increases with input
voltage to >300 kΩ at 600V.

MIN MAX Recording Accuracy and Response Time

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Specified accuracy of the measurement function ±12 digits for changes
>200 ms in duration (±40 digits in ac). Typical 100 ms response to 80%.

MIN MAX Recording with Elapsed Time

Elapsed Time Resolution Accuracy

0 to 100 hours

(99:59)

1 minute 0.3% typical