MARTINDALE CT60 User manual

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: [phone] Fax: [phone].
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.