Amprobe LH41A Manuale utente

User Manual

LH41A

Clamp On Ammeter

Limited Warranty and Limitation of Liability

Your Amprobe product will be free from defects in material

and workmanship for 1 year from the date of purchase. This

warranty does not cover fuses, disposable batteries or damage

from accident, neglect, misuse, alteration, contamination, or

abnormal conditions of operation or handling. Resellers are not

authorized to extend any other warranty on Amprobe’s behalf.

To obtain service during the warranty period, return the product

with proof of purchase to an authorized Amprobe Test Tools

Service Center or to an Amprobe dealer or distributor. See Repair

Section for details. THIS WARRANTY IS YOUR ONLY REMEDY.

ALL OTHER WARRANTIES - WHETHER EXPRESS, IMPLIED OR

STAUTORY - INCLUDING IMPLIED WARRANTIES OF FITNESS FOR

A PARTICULAR PURPOSE OR MERCHANTABILITY, ARE HEREBY

DISCLAIMED. MANUFACTURER SHALL NOT BE LIABLE FOR ANY

SPECIAL, INDIRECT, INCIDENTAL 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 damages, this

limitation of liability may not apply to you.

Repair

All test tools returned for warranty or non-warranty repair or for

calibration should be accompanied by the following: your name,

company’s name, address, telephone number, and proof of purchase.

Additionally, please include a brief description of the problem or the

service requested and include the test leads with the meter. Non-

warranty repair or replacement charges should be remitted in the

form of a check, a money order, credit card with expiration date, or a

purchase order made payable to Amprobe® Test Tools.

International Electrical Symbols

Caution! Refer to this manual before using the meter

Meter is protected by Reinforced or Double Insulation

Complies with EU directives



Indicates this equipment should for disposal be

seperated as Waste Electrical and Electrical Equipment

according to the EU directive 2002/96/EG



Indicates item is a Type A Current sensor and that

application around removal from HAZARDOUS LIVE

conductors is permissible

CONTENTS Page

1INTRODUCTION .............................................. 2

2 SPECIFICATIONS............................................... 3

2.1 Electrical Data .............................................. 3

2.2 General Data ................................................ 3

3 OPERATING INSTRUCTIONS............................ 4

3.1 Switch On ..................................................... 4

3.2 Zero Adjustment .......................................... 4

3.3 Current Measurement ................................. 4

3.4 Data Hold ...................................................... 4

3.5 Auto Power Off............................................. 4

4 SAFETY............................................................. 5

5 BATTERY REPLACEMENT................................. 6

6 WARRANTY ..................................................... 6

7 OTHER PRODUCTS .......................................... 7

INTRODUCTION

The LH41A current clamp meter has been designed for

reliable and accurate non-intrusive measurement of DC

and AC currents using advanced Hall Effect technology.

Measurement features include:

• Non - intrusive AC and DC current measurement

• 1mA resolution

• Average responding, RMS calibrated

• Autoranging/ Autozeroing

• Data Hold

• Low battery indicator

• Auto Power Off

HOLD

LH 41A

AUTO

40A

ZERO

OFF ACDC

Fig. 1

SPECIFICATIONS

2.1 Electrical Data

(All accuracies stated at 23°C ± 1°C)

LH41A

Measuring Range .............. 0 - 40 A DC or AC pk

Autoranging...................... 4A / 40A

Resolution.......................... 1 mA in 4 A range

10 mA in 40 A range

Accuracy

Basic Accuracy.................... ± 1.3% + 5 digits

Temperature coefﬁcient ... ± 0.05% of rdg / °C

Frequency range................ DC in DC

40 Hz to 400 Hz in AC

Overload capacity.............. 150 A

Dielectric strength............. 3.7 kV RMS. 50 Hz 60s

(EN61010-2-032 Cat III, 300V Pollution Degree 2)

2.2 General Data

Operating temperature .... 0°C to + 50°C

Storage temperature with

Battery removed................ - 20°C to + 60°C

Power supply ..................... 9 V, Alkaline battery

PP3, NEDA 1604 or

IEC6LR61

Battery life......................... 15 hours dependent

duty cycle

Display................................ 4000 count

Characters.......................... 10 mm high

Mechanical

LH41A

Dimensions ........................ 184 x 71 x 31 mm

(7.2 x 2.8 x 1.2 in.)

Max. jaw capacity.............. 19 mm ø cable

Max. jaw opening ............. 20 mm (.78 in.)

Weight ............................... 235 g (1.2 Lb)

OPERATING INSTRUCTIONS

Refer to Fig. 1 for the main operating features of the

meter.

3.1 Switch On

Move the switch from the OFF / HOLD position to either

DC or AC to select the required mode of operation.

3.2 Zero Adjustment

When in DC mode the display zero may change due to

thermal shifts and other environmental conditions. An

auto zero adjustment is provided. Proceed as follows to

perform the adjustment:

• Ensure that the instrument is away from the current

carrying conductor and that the jaws are closed

during the adjustment cycle.

• Select the DC position of the power switch.

• Use the auto zero button to zero the display if

necessary.

The auto zero button can be used to null the effects of

the earth’s magnetic ﬁeld on DC measurements.

3.3 Current Measurement

Select as required the DC or AC measurement option

using the power switch.

If necessary adjust the DC display to read zero as

described in section 3.2. Clamp the jaws of the instrument

around the conductor ensuring a good contact between

the closing faces of the jaws.

Observe and take measurements as required. Positive

output indicates that the current ﬂow is in the direction

shown by the arrow on the instrument.

3.4 Data Hold

To activate the data hold, turn the power switch to the

OFF / HOLD position. The data will be held on the display

for approximately 10 seconds.

3.5 Auto Power Off

The meter will power down automatically after

approximately 8 minutes of inactivity.

SAFETY

This product conforms to the latest directives concerning

safety and electromagnetic compatibility.

• European Low Voltage Directives 73/23/EEC and 93/68/

EEC

• European EMC Directives 89/336/EEC and 93/68/EEC

Safety Standards

BSEN61010-1: 2001. General Requirements.

Safety requirements for electrical equipment for

measurement, control and laboratory use.

BSEN61010-2-032: 2002. Particular requirements for hand

held current clamps for electrical measurement and test.

EMC Standards

RF Susceptibility

EN50082-1: 1992 3V/m Residential, Commercial and Light

Industry

RF Emissions

EN50081-1: 1992 Residential, Commercial

and Light Industry

FCC Part 15 Class B

This product is designed to be safe under the following

conditions:

− indoor use

− altitude up to 2000m

− temperature 0°C to +50°C

− maximum relative humidity 80% for

temperatures up to 31°C decreasing linearly to

40% relative humidity at 50°C.

Use of the meter on uninsulated conductors is limited to

300V RMS or DC and frequencies below 1kHz.

This meter complies with the requirements of the above

safety standard for 300V Cat III Pollution degree 2

Safety in its use is the responsibility of the operator who

must be a suitably qualiﬁed or authorised person.

Users of this equipment and or their employees are

reminded that Health and Safety Legislation require

them to carry out valid risk assessments of all electrical

work so as to identify potential sources of electrical

danger and risk of electrical injury such as from

inadvertent short circuits.

Do not use the instrument if any part of it appears to

be damaged or if a malfunction of the instrument is

suspected.

When using the instrument ensure that your ﬁngers are

behind the protective barrier see Fig. 1

Clean the case periodically by wiping it with a damp cloth

and detergent. Do not use abrasive cleaners or solvents.

Do not immerse the instrument in liquids.

BATTERY REPLACEMENT

SAFETY WARNING

Before removing the battery cover,

make sure that the instrument is

removed from any live electrical circuit.

When the Low Battery symbol is illuminated in the

display the minimum operating battery voltage has been

reached. Refer to Fig.1. and use the following procedure

to replace the battery.

Unclamp the meter from the conductor, turn it off using

the OFF / Hold power switch. Loosen the captive screw

which secures the battery cover. Lift the cover through

30°and pull it clear of the instrument body as shown in

Fig1. The battery is then accessible. Replace the battery

and re-ﬁt the battery cover and fasten the screw.

Replacement with other than the speciﬁed type of

battery will invalidate the warranty. Fit only Type 9 V PP3,

Alkaline (MN1604 ).

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