Fluke 312 User manual

PN 1989445

July 2002 Rev.2, 2/06

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: 010-65123435

Shanghai ShiLu Instrument Co., Ltd.

No. 139, Lane 2638, Hongmei South Road

Shanghai 201108

Standard No. Q/SXAV 2-2002

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

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

•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

Explanation of Symbols

Risk of danger. Important information. Refer to operation instructions.

Risk of electric shock.

Application and removal from hazardous live conductors permitted.

Double insulated.

Battery

Earth Ground

Alternating current

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.

Complies with European standards EN/IEC 61010-1 2

Edition and EN/IEC

61010-02-032

312, 316, 318

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

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

(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 %

AC Volts

(50 ~ 500 Hz)

400.0 V

750 V 0.1 V

1 V 1.2 %

5 1.5 %

DC Volts

400.0 V

1000 V 0.1 V

1 V 0.75 %

2 1 %

Resistance

(ohms)

400.0

Ω

4000

Ω

0.1

Ω

1 %

3 1 %

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) /

C (< 18

C or > 28

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

Instrument Overview

Feature Locations

TRUE RMS

CLAMP METER

318

AC/DC MIN MAXREL

OFF

40A

400A

1000A

PEAK HOLD

OFF

PEAK HOLD

RANGE

aca11f.eps

Current Sensing Clamp

Input Terminal

Peak Button

COM

Terminal

Hold Button

REL Button (316, 318)

Range Button (312)

Rotary Function Switch

AC/DC Button (316, 318)

Clamp-opening Trigger

MIN MAX Button (316, 318)

Conductor Alignment Marks

LCD

Tactile Indicator

Figure 1. Feature Locations (318 shown)

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