Nieaf Instruments NI 31 User manual

Stroomtang / Current Clamp NI 31
Handleiding / Manual

INTRODUCTION
1-1 Unpacking and Inspection
Upon removing your new current transducer from it's packing , you should have the following items:
1. Current Transducer with coiled cable out put plugs.
2. Instruction manual.
3. Carrying Case.

Figure 1

1-2 Front View
Refer to Figure 1 and the following numbered steps to familiarize yourself with the transducer.
1. Transformer Jaws — Designed to pick up the a.c. current following through the conductor.
2. Hand Guard —Designed to protect user for safety.
3. Trigger —Press the lever to open the transformer jaws.
Meter Safety
Terms as Marked on Equipment
ATTENTION — Refer to Manual.
DOUBLE INSULATION — Protection Class II.
DANGER — Risk of electric shock.
Symbols in this Manual
This symbol indicates where cautionary or other information is found in the manual.

SPECIFICATIONS
Current Range : 0.1A to 400A a.c. RMS.
Output Voltage : 1mV a.c. per 1Amp a.c.
Working Voltage : 600V CAT. II per IEC 1010-1
Maximum Altitude : 2000m
Operating Temperature : 0°C to 45°C <75% R.H.
Storage Temperature : -20°C ~ 60°C
Type of Sensing : Induction coil sensing for AC current.

Temperature Coefficient : 0.2 x (Spec Acc'y)/ °C, < 18°C or > 28°C
Maximum Output Impedance : 75Ω.
Maximum Jaw Opening : 30mm.
Maximum Conductor Size : 29mm diameter.
Size : 72mm (W) x 148mm (L) x 36mm(D) W/O cable.
Weight : 250grams.
Indoor use.
Maximum Altitude : 2000 meter.
Accessories : Manual , Carrying Case.

Precautions and Preparations for measurement
1. Do not apply the voltage to the output plugs.
2. Do not use or store this instrument in a high temperature or high humidity environment and do
not store the unit in direct sunlight.
3. Do not measure current before the unit is not combined with DMM.
4. If the instrument is used near noise generating equipment , be aware that output voltage may
become unstable or get more errors.
THIS INSTRUMENT MUST NOT BE USED ON UNINSULATED CONDUCTORS AT A
VOLTAGE GREATER THAN 250V ac/dc.

Electrical Specification
Accuracy is ±(%reading + number of Ampere) at 23°C
±5 °C, less than 75% R.H.
Range Measure Output Accuracy
3Amp 3mV
30Amp 30mV
350Amp 350mV
±(1.9% + 0.5A)
50 ~ 60 Hz
400A
400Amp 400mV ±(3.2% + 1A)
50 ~ 60 Hz

OPERATION
AC Current Measurement
1. Set the DMM at ACV Function and proper range.
2. Connect the plug of transducer with DMM firmly.
3. Press the trigger to open transformer jaws and clamp one conductor only, making sure that the
jaw is firmly closed around the conductor and reading the result from the digital display of DMM.
MAINTENANCE
To keep the instrument clean , wipe the case with a damp cloth and detergent , do not use
abrasives or solvents.
Any adjustment , maintenance and repair shall be conducted by a service personnel.

Nieaf-Smitt B.V.
Vrieslantlaan 6, 3526 AA, Utrecht
P.O. Box 7023, 3502 KA, Utrecht, The Netherlands
Tel.: [phone]
Fax: [phone]
E-mail: [e-mail]
Internet: http://www.nieaf-smitt.nl
http://www.nieaf-instruments.com