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A 1391 - 40A/300A
AC/DC CURRENT CLAMP
INSTRUCTION MANUAL
Code No. 20 751 907
INTRODUCTION
1 -1 Unpacking and Inspection
Upon removing your new Current Clamp Meter from its packing, you should have the following items:
1. Current Clamp with coiled cable output plugs.
2. Carrying Case.
3. Instruction manual.
1 -2 Meter Safety
Terms as Marked on Equipment
ATTENTION — Refer to manual
DOUBLE INSULATION — Protection Class II.
DANGER — Risk of electric shock.
Application around and removal from HAZARDOUS LIVE conductors is permitted.
Symbols in this Manual
1 -3 Front Panel
Refer to Figure 1 and the following numbered steps to familiarize yourself with the meter’s front panel controls and
connectors.
1. Red LED — Low battery display.
2. Green LED — Power on display.
3. Coiled Cable Output Leads — Voltage output.
4. Function Switch — Function select switch used to select measuring function.
5. DC Zero Button — DCA AUTO ZERO on DC current ranges.
6. Trigger — Press the lever to open the transformer jaws.
7. Transformer Jaws — Designed to pick up the a.c./d.c. current following through the conductor.
This symbol indicates where cautionary or other information is found in the manual.
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Figure 1
SPECIFICATIONS
2-1 General Specifications
Position Error +/- 1% of Reading.
Type Of Sensing Hall effect sensing for AC and DC.
Low Battery Indicator Red LED indicator.
Power On Indicator Green LED indicator , flashing.
Temperature Coefficient 0.2 x (Spec.Acc’y) / °C , < 18°C or > 28°C .
Power Requirement Single 9V battery (NEDA 1604A or IEC 6LF22) (Use supplied)
Battery Life 66 hours typical (Alkaline).
Max / Conductor Size 22mm diameter.
Size 66mm (W) x 185mm (L) x 40mm (H)
Weight 270 grams
Accessories Coiled cable output plugs (installed) , manual and carrying case.
2-2 Environmental Conditions
Indoor use
Maximum Altitude 2000 Meter
Measurement Category IEC 61010-1 600V CAT. III.
Pollution Degree 2
Operating Ambient 0ºC ~ 50ºC , <75%R.H.
Storage Temperature -20ºC ~ 60ºC, < 80% R.H.
2-3 Electrical Specifications
All at 23ºC ± 5ºC, less than 75% R.H.
Ranges 0 ~ 40A / 300A AC
0 ~ 40A / 300A DC
(1) DC Current
Ranges 40A, 300A
Output Voltage 10mV / A for 40A Range
1mV / A for 300A Range
Accuracy 40A Range
300A Range
(0 - 40)A ±(1.0% + 0.2A)
(40 - 200)A ± (1.0% + 1A)
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(2) AC Current
Ranges 40A, 300A
Output Voltage 10mV / A for 40A Range
1mV / A for 300A Range
Accuracy 40A Range
300A Range
Load Impendence
300A Range
300A Range
100KΩ min.AC/DC
(200 - 300)A ± (1.9% + 2A)
(0 - 40)A ±(1.0% + 0.2A) 40-400Hz
(40 - 200)A ± (1.0% + 1A) 40-400Hz
(200 - 300)A ± (1.9% + 2A) 40-400Hz
OPERATION
This instrument has been designed and tested in accordance with IEC Publications 61010-1 and 61010-2-032, Safety
Requirements For Electronic Measuring Apparatus / current sensors and has been supplied in a safe condition. This
instruction manual contains some information and warnings which have to be followed by the user to ensure safe
operation and to retain the instrument in safe condition.
3-1 Precautions and Preparations for measurement
1. Do not apply the voltage to the output plugs.
2. Make sure that the battery is connected properly.
3. Operate the instrument only in temperature between 0°C ~ 50°C and less than 75% R.H.
4. Do not use or store this instrument in high temperature or high humidity and do not store the unit in direct sunlight.
5. If the unit is not to be used for a long period of time, remove the battery.
6. Do not forget to turn power switch off after use.
7. If the meter is used near equipment that generates electro-magnetic, the output may be unstable or indicate incorrect
measurement values.
8. If the current clamp is used in a manner not specified in this User manual, the provided protection can be impaired
9. Do not extend hands over safety barrier to prevent of electric shock! Only handles are allowed to be touched during
measurement!
10. Consider all generally known precautions in order to avoid risk of electric shock while dealing with electric installations!
THIS INSTRUMENT MUST NOT BE USED ON UNINSULATED CONDUCTORS AT A VOLTAGE
3-2 AC Current Measurement
1. Select the highest anticipated input (300A or 40A) by the function switch.
2. Insert the “Output plugs (red and black)” to the input terminals of a Multimeter. Set the Multimeter to “AC 200mV or 2V”
range.
3. Press the trigger to open the transformer jaws and clamp one conductor only, make sure that the jaw is firmly
closed around the conductor, then read the display from the multimeter directly.
(For proper current direction, upper side of the current clamp is facing L)
(To eliminate dc offset, zero adjust first. With jaws closed and away from conductor, continue to press DCA AUTO ZERO
button until instrument reads all zeroes or very close to it.)
GREATER THAN 300V ac/dc.
3-3 DC Current Measurement
1. Select the highest anticipated input (300A or 40A) by the function switch.
2. Insert the “Output plugs (red and black) “ to the input terminals of a Multimeter.
Set the Multimeter to “DC 200mV or 2V” range.
3. Be sure to zero adjust first. With jaws closed and away from conductor, continue to press DCA AUTO ZERO
Button until instrument reads all zeroes or very close to it.
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4. For DC measurement, output is positive in the red plug when the current flows from the lower side to the upper
side of the current clamp as shown in Figure 2. (Upper side of the current clamp is facing the positive measurement
contact)
5. Press the trigger to open the transformer jaws and clamp one conductor only, make sure that the jaw is firmly
closed around the conductor, then read the display from the multimeter directly.
Figure 2
M AINTENANCE
TO AVOID ELECTRICAL SHOCK REMOVE TEST LEADS BEFORE OPENING THE COVER.
General Maintenance
1. Repairs or servicing not converted in this manual should only be performed by qualified personal.
2. Periodically wipe the case with a dry cloth and detergent do not use abrasives or solvents.
Battery Installation Replacement
The meter is powered by a single 9V ba ttery . R efer to Figu re 3 and u se th e fo llow ing pro cedur e to re pla ce the b atte ry .
1. Disconnect the output plugs and turn the meter off.
2. Position the adaptor face down and remove the screw on the cover of the battery compartment.
3. Unsnap the battery compartment and remove the battery.
4. Install a new 9V battery and refit the battery compartment.
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9V Battery
9V Battery
Screw
Screw
Figure 3
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Producer:
METREL d.d.
Ljubljanska 77
SI-1354 Horjul
Tel.: +386 1 75 58 200
Fax: +386 1 75 49 226
E-mail: metrel@metrel.si
http://www.metrel.si
Mark on your equipment certifies that this equipment meets the requirements of the EC
(European Community) regulations concerning safety and electromagnetic compatibility.
© 2011 Metrel
No part of this publication may be reproduced or utilized in any form or by any means without permission
in writing from METREL
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