MARTINDALE CT60 Manuel utilisateur

SPECIFICATIONS

General

Captured Conductor Size: 30mm maximum.

Low Battery Indicator: Red LED lighting.

Operating Temperature: 0° C to 50° C, Max 70% R.H.

Storage Temperature: -20° C to +70° C, Max 80% R.H.

Weight: 290gm typical

Dimensions: 178mm (H) x 70mm (W) x 33mm (D).

Electrical

Accuracy (At 23° ± 5° C, 70% R.H maximum)

DC Current: 0 to 600A, ± (2% reading + 2A)

AC current: 50Hz to 400Hz

0 to 400A, ± (2% reading + 2A)

400A to 500A, ± (3% reading + 2A)

500A to 600A, ± (6% reading + 2A)

Load Resistance: 10K Typical.

Output: 0 to 600mV (AC and DC) for 0 to 600A.Met

Metrohm House, Imperial Park, Imperial Way, Watford, Hertfordshire, WD24 4PP, UK

Tel: 01923 441717 Fax: 01923 446900.

Due to policy of continuous development, Martindale reserves the right to alter equipment specification and description

outlined in this document without prior notice. No part of this document shall be deemed to be part of any contract for the

equipment unless specifically referred to as an inclusion within such contract. © Martindale Electric Co. Ltd. 2000

CT60

AC/DC Current

Clamp

INSTRUCTION MANUAL

APPLICATION NOTES

1. In the case of DC current, the output is positive when the

current flows from the top to the underside of the clamp. The red

4mm plug is positive.

2. In the case of DC current measurement, a hysteresis effect

can occur so that it is impossible to zero the clamp properly. To

eliminate this effect, open and close the jaws several times and

then zero again.

3. When there is a strong stray magnetic field, it is best to zero

the clamp approximately 2 to 4 inches (50-100mm) away from

the conductor to be measured. The conductor itself will have no

influence at this distance. Then, clamp the jaws around the

conductor and measure the current.

4. A good tip for measuring low currents is to loop an

appropriate number of turns of the conductor through the jaws.

The actual current is the measured value divided by the number

of turns.

BATTERY REPLACEMENT

Remove the screw on the rear of the clamp, remove the battery,

and replace with a 9-volt battery, NEDA 1604/PP3.

INTRODUCTION

The model CT60 AC/DC Current Clamp is an accessory which

will allow your multimeter to measure electrical current up to 600

amperes AC/DC, with a frequency response up to 400Hz. When

measuring current with this clamp, there is no need to break a

circuit or to affect the isolation.

APPLICATION PROCEDURE

1. Insert the black 4mm plug into the COM jack and the red

4mm plug into the V- jack of any multimeter with a minimum input

impedance of 10KΩ.

2. Set the power switch from "Off" to "On" position, the green

LED will light to indicate that the clamp is switched on. For

current measurement below 20A, set the multimeter range to

200mV AC for AC current measurements or 200mV DC for DC

current measurements. The reading is directly in A. For current

measurements above 200A, set the multimeter range to 2V AC

or DC, depending on whether measuring AC or AC current. The

reading is now A x 1000.

3. Turn the zero adjustment knob on the clamp until the

multimeter reads zero.

4. Clamp the jaws around the current-carrying conductor and

interpret the reading according to Step 2 above. Ensure there is

only the conductor being measured inside the jaws. If you

attempt to measure around both Line & Neutral for example only

the difference will be measured - usually giving zero as the

result.

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