Fluke 312 User manual

®
PN 1989445
July 2002 Rev.2, 2/06
© 2002, 2006 Fluke Corporation. All rights reserved. Printed in China.
All product names are trademarks of their respective companies.
312, 316, 318
Clamp Meter
Users Manual

LIMITED WARRANTY AND LIMITATION OF LIABILITY
This Fluke product will be free from defects in material and
workmanship for one year from the date of purchase. This
warranty does not cover fuses, disposable batteries, or
damage from accident, neglect, misuse, alteration, con-
tamination, or abnormal conditions of operation or handling.
Resellers are not authorized to extend any other warranty
on Fluke’s behalf. To obtain service during the warranty
period, return the unit to point of purchase with a descrip-
tion of the problem.
THIS WARRANTY IS YOUR ONLY REMEDY. NO OTHER
WARRANTIES, SUCH AS FITNESS FOR A PARTICULAR
PURPOSE, ARE EXPRESSED OR IMPLIED. FLUKE IS
NOT LIABLE FOR ANY SPECIAL, INDIRECT, INCIDEN-
TAL OR CONSEQUENTIAL DAMAGES OR LOSSES,
ARISING FROM ANY CAUSE OR THEORY. Since some
states or countries do not allow the exclusion or limitation of
an implied warranty or of incidental or consequential dam-
ages, this limitation of liability may not apply to you.
Fluke Corporation
P.O. Box 9090
Everett, WA 98206-9090
U.S.A.
Service Center Address:
Fluke Corporation Beijing Service Center
Room 2301 Scite Tower
22 Jianguomenwai Dajie, Chao Yang District
Beijing 100004, PRC
Tel: [phone]
Shanghai ShiLu Instrument Co., Ltd.
No. 139, Lane 2638, Hongmei South Road
Shanghai 201108
Standard No. Q/SXAV 2-2002

i
Table of Contents
Title Page
Safety Information – Read first.........................1
General Specifications .....................................4
Electrical Specifications....................................5
Instrument Overview Feature Locations...........6
Symbol Definition...........................................7
Making Measurements .....................................7
Measuring AC Current ...................................8
Measuring DC Current (316, 318 only) ..........9
Measuring AC and DC Voltage......................9
Measuring Resistance ...................................12
Testing Continuity ..........................................13
Diode Test......................................................14
Data Hold.......................................................15
Peak...............................................................15
MIN MAX (316, 318 only)...............................15
REL (S) (316, 318 only) ................................16
Range (312 only) ...........................................16
Changing the Battery........................................16
Cleaning the Meter...........................................16
Maintenance.....................................................16

ii

1
312, 316, 318
Safety Information – Read first
WWarnings: Read Before Using
To avoid possible electric shock or personal injury:
•Use the Meter only as specified in this manual or the
protection provided by the Meter might be impaired.
•Do not use the Meter in wet environments.
•Inspect the Meter before using it. Do not use the Meter
if it appears damaged. Look for cracks or missing
plastic. Pay particular attention to the insulation
around the connectors.
•Inspect the test leads before use. Do not use them if
insulation is damaged or metal is exposed. Check the
test leads for continuity. Replace damaged test leads
before using the Meter.
•Have the Meter serviced only by qualified service
personnel.
•Do not apply more than the rated voltage, as marked
on the Meter, between the terminals or between any
terminal and earth ground.
•Remove test leads from the Meter before opening the
Meter case.
•Never operate the Meter with the back cover removed
or the case open.
•Never remove the back cover or open the case of an
instrument without first removing the power source.
•Use caution when working with voltages above 33 V ac
rms, 46.7 V ac peak, or 70 V dc. These voltages pose a
shock hazard.
•Use the proper terminals, function, and range for your
measurements.
•Do not operate the Meter around explosive gas, vapor,
or dust.

312, 316, 318
2
•When using probes, keep your fingers behind the
finger guards.
•When making electrical connections, connect the
common test lead before connecting the live test lead;
when disconnecting, disconnect the live test lead
before disconnecting the common test lead.
•Disconnect circuit power and discharge all high-
voltage capacitors before testing resistance,
continuity, or diodes.
•Use only a single 9 V battery, properly installed in the
Meter case, to power the Meter.
•Replace the battery as soon as the low battery
indicator (B) appears to avoid false readings that can
lead to electric shock and injury.
•Check Meter operation on a known source before and
after use.
•When servicing, use only specified replacement parts.
•Adhere to local and national safety codes. Industrial
protective equipment must be used to prevent shock
and arc blast injury where hazardous live conductors
were exposed.
•Do not hold the Current Probe anywhere beyond the
tactile indicator (see Figure 1).
Environmental Conditions:
Altitude: up to 2000 meters.
Operating temperature: 0 °C ~ 30 °C, up to 90 % RH, non-
condensing
30 °C ~ 40 °C, up to 80% RH, non-condensing
Storage temperature: -10 °C ~ 60 °C, battery removed
Pollution Degree: 2
Measurement Categories: CAT III (600 V), CAT II (1000 V)
Electromagnetic Compatibility: 3 V/m, performance criterion B

Users Manual
3
Explanation of Symbols
W Risk of danger. Important information. Refer to operation instructions.
X
Risk of electric shock.
, Application and removal from hazardous live conductors permitted.
T
Double insulated.
B Battery
J Earth Ground
B Alternating current
F Direct current
CAT II
Equipment is designed to protect against transients from energy-consuming
equipment supplied from the fixed installation, such as televisions, personal
computers, portable tools, and other household appliances.
CAT III
Equipment is designed to protect against transients in equipment in fixed-
equipment installations, such as distribution panels, feeders and short branch
circuits, and lighting systems in large buildings.
P
Complies with European standards EN/IEC 61010-1 2
nd
Edition and EN/IEC
61010-02-032

312, 316, 318
4
General Specifications
Digital Display: 3-3/4 digits with maximum reading of 3999
Analog Display: Fast 42-segment analog bar graph display
Overload: Displays OL when input signal exceeds measuring limit
in 40 A, 400 A, resistance, and continuity functions.
Note
In Volts and Amps, the LCD may continue to display
values above the indicated measuring limit (up to 4000
counts). Refer to specifications for measuring limits.
Sample Rate: 2 times/sec for digital display; 20 times/sec for
analog bar graph
Low Battery Indication: Displays Bwhen the battery is below its
required voltage
Power Source: 9 V battery, NEDA1604 or 6F22 or 006P
Battery Life:
(Alkaline):
33 hrs typical in A
65 hrs typical in GR
100 hrs typical in V, e
Auto Power Off: The Meter will power itself off if there is no push
button or rotary function switch operation for 30 minutes. Turn the
rotary switch to “OFF” before turning the Meter on again.
To deactivate this feature, press the Peak button and keep it
pressed down while powering up the Meter.
Clamp Opening Size:
312: 36 mm (1.42 inches)
316, 318: 40 mm (1.57 inches)
Dimensions (L x W x H): 254 x 66 x 37 mm (10 x 2.60 x 1.45
inches)
Weight: 422 g (14.9 ounces) (battery included)
Included Accessories: Users manual, carrying case, test leads,
9 V battery
Approvals: P,EN61010 600 V CAT III, 1000 V CAT II, CMC

Users Manual
5
Electrical Specifications
The accuracy specification is defined as + (% reading + digits) at
23 oC + 5 oC1.
Accuracy (% reading + digits)
Function Range Resolution 312 316 & 318
1.9 % ± 5 (50 ~ 60 Hz)
AC Amps
2
(50 ~ 500 Hz)
40.00 A
400.0 A
1000 A
0.01 A
0.1 A
1 A
1.9 %
± 5 2.5 %
± 5 (60 - 500 Hz)
DC Amps
40.00 A
400.0 A
1000 A
0.01 A
0.1 A
1 A - 2.5 %
± 10
AC Volts
2
(50 ~ 500 Hz)
400.0 V
750 V 0.1 V 1 V 1.2 %
± 5 1.5 % ± 5
DC Volts
400.0 V
1000 V 0.1 V 1 V 0.75 %
± 2 1 % ± 2
Resistance
(ohms)
400.0 Ω
4000
Ω 0.1
Ω
1
Ω 1 %
± 3 1 % ± 3
Continuity
On at < 50 Ω
Diode Test
Up to 2 V
Min Max
500 ms acquisition time
Input
Impedance
10 M Ω
Auto
Shut-off
After 30 min ± 2 min. Disabled in Min Max. Can be disabled as a power up
option (hold down the peak button)
Auto range
Available in the following measurement functions: Volts & Ohms (Amps for
312 only)
Overload
Protection
600 Vrms per EN61010 CAT III 600 V
1. Temperature Coefficient: 0.1 x (specified accuracy) /
o
C (< 18
o
C or > 28
o
C)
2. True rms for ac voltage and ac amps accuracy is specified from 5 % to 100 % of range. Crest
factor (50 ~ 60 Hz) is 3.0 max in the 40 A and 400 A ranges and 1.4 max in the 1000 A
range (318 only).
3. The measurement time for current above 400 A is limited to 5 minutes followed by a
cooling off time of 15 minutes.

312, 316, 318
6
Instrument Overview
Feature Locations
12
1
TRUE RMS
CLAMP METER
318
AC/DC MIN MAXREL
OFF
40A
400A
1000A
V
PEAK HOLD
OFF
PEAK HOLD
RANGE
4
5
2
3
6
11
13
8
7
9
10
14
aca11f.eps
A Current Sensing Clamp H V e Input Terminal
B Peak Button I COM Terminal
C Hold Button J REL Button (316, 318)
D Range Button (312) K Rotary Function Switch
E AC/DC Button (316, 318) L Clamp-opening Trigger
F MIN MAX Button (316, 318) M Conductor Alignment Marks
G LCD N Tactile Indicator
Figure 1. Feature Locations (318 shown)