AUTEL SA256 650A AC and DC Current Clamp User Manual

SA256 650A AC and DC Current Clamp
User Manual SA256

INTRODUCTION

When measuring AC or DC with the Current Clamp, you can connect it with a multimeter or an oscilloscope to directly read the current value without the need to make physical contact with the conductor or to disconnect it for insertion through the probe. The Current Clamp measures a maximum current of 650A, with a frequency up to 400Hz. It works with jaws that open to allow clamping around an electrical conductor. After linking it with a multimeter or an oscilloscope, push down the zero adjustment knob on the clamp until the multimeter or oscilloscope reads zero.

APPLICATION PROCEDURE

1. Connect the BNC connector of the clamp to the input of a multimeter or an oscilloscope with an input impedance of at least 10k ohms.
2. When the current is no greater than 200A, set the current clamp to the range of 1mV/10mA, otherwise to 1mV /1 A. The green LED lights, indicate that the clamp is switched on.
3. Before measuring DC, please push down the zero adjustment knobs on the clamp until the multimeter or oscilloscope reads zero. When using an oscilloscope, set DC-coupled mode to measure DC.
4. Clamp the jaws around the electrical conductor.
5. When the current clamp is set to 1mV/100mA, the actual current value is one hundred times the measured data whose unit is mV. For example, the measured data is 10mV and the actual current is 10×100=1000mA.
6. When the current clamp is set to 1mV /1 A, the actual current is one thousand times the measured data whose unit is mV. For example, the measured data is 5 mV and the actual current is 5×1000=5000mA.

APPLICATION NOTES

1. In the case of DC measurement, the output is positive when the current flows from the upside to the underside of the clamp.
2. In the case of DC measurement, the current clamp may not be zeroed, due to the hysteresis effect. To eliminate its influence, open and close the jaws several times before zeroing the current clamp.

APPLICATION SAFETY

1. The voltage of the conductor measured cannot exceed 300V DC or 240V rms AC.
2. You cannot measure a piece of a conductor whose insulation is broken or worn to avoid possible electric shock.

GENERAL SPECIFICATIONS

Conductor diameter: 30mm maximum
Low Battery Indicator: Red LED
Operating Temperature: 0C to 50C, 70% R.H.
Storage Temperature: -20C-+70C, 80% R.H.
Battery type: 9V DC, NEDA 1604, 6F22, 006P
Battery Life: 100 hours typical with carbon-zinc
Weight: 250 grams
Dimensions: 195 mm (H) 70 mm (W) x 33 mm (D)
Output: Through a BNC connector

ELECTRICAL (At 23±5 C, 70% RR.H. maximum)

Efficient Measure Range:
1mV/100mA: 1 00mA to 200A DC or rms AC
1mV/1A: 1A to 650A DC or rms AC

Precision:
System Accuracy: The precision of the current clamp adds to that of the digital multimeter or oscilloscope.
For example, if the conductor carries 1A current, the current clamp is set to 1mV /1 00mA and the output is 10mV.
If the precision is 1.5%, the output is between 9.85mV and 10.15mV.
If the digital multimeter or oscilloscope connected with the current clamp is set to 200mV and the precision is 0.5%, the readings is between 9.80mV and 10.20mV.
(10.15mV(1+0.5%)=10.20m/, 9.85m/(1-0.5%)=9.80m/)

Accuracy:
DC: 1mV/100mA
±(1.5%±50m A) 100mA to 200A
DC: 1mV/1A
±(2%±0.5 A) 1A to 200 A,
±(4%±2 A) 200A to 650 A
AC (50 Hz to 400 Hz): 1mV/100mA
±(3%±0.5A) 100mA – 100A
±(8%±1A) 100A – 150A
AC (50 Hz to 400 Hz): 1mV/1A
±(3%±24) 1A – 500A
±(6%±24) 500A – 600A
±(8%±2A) 600A – 650A

Load Resistance: 10k0
Temperature coefficient: 0.1x(defined accuracy) per degree C(0C to 18C, 28C to 50 C)

SAFETY INFORMATION

The instrument complies with class II, overvoltage CAT II of EN 61010-1 and EN 61010-2-032. The pollution degree of the current clamp is level 2 in accordance with IEC 664 indoor use. If the equipment is used in a manner not specified, the protection provided by the equipment may be impaired.
This product complies with the requirements of the following European Community Directives: 89/336/EEC (Electromagnetic Compatibility) and 73/23/EEC (Low voltage) as amended by 93/68/EEC (CE marking).

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