Amprobe CT-53 User manual

CT-53
3000 A Flexible 3-Sensor Current Transducer
Instruction Manual
 Manual de usuario
 Manuel de l’utilisateur

CT-53
3000 A Flexible 3-Sensor Current
Transducer
Instruction Manual
11/2015, 6006998 A
©2015 Amprobe.
All rights reserved. Printed in Japan
English

Limited Warranty and Limitation of Liability
Your Amprobe product will be free from defects in material and workmanship for one
year from the date of purchase unless local laws require otherwise. This warranty does
not cover fuses, disposable batteries or damage from accident, neglect, misuse, alteration,
contamination, or abnormal conditions of operation or handling. Resellers are not
authorized to extend any other warranty on the behalf of Amprobe. To obtain service
during the warranty period, return the product with proof of purchase to an authorized
Amprobe Service Center or to an Amprobe dealer or distributor. See Repair Section for
details. THIS WARRANTY IS YOUR ONLY REMEDY. ALL OTHER WARRANTIES - WHETHER
EXPRESS, IMPLIED OR STATUTORY - INCLUDING IMPLIED WARRANTIES OF FITNESS FOR A
PARTICULAR PURPOSE OR MERCHANTABILITY, ARE HEREBY DISCLAIMED. MANUFACTURER
SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL
DAMAGES OR LOSSES, ARISING FROM ANY CAUSE OR THEORY. Since some states or
countries do not allow the exclusion or limitation of an implied warranty or of incidental or
consequential damages, this limitation of liability may not apply to you.
Repair
All Amprobe returned for warranty or non-warranty repair or for calibration should be
accompanied by the following: your name, company’s name, address, telephone number,
and proof of purchase. Additionally, please include a brief description of the problem or
the service requested and include the test leads with the meter. Non-warranty repair or
replacement charges should be remitted in the form of a check, a money order, credit
card with expiration date, or a purchase order made payable to Amprobe.
In-warranty Repairs and Replacement – All Countries
Please read the warranty statement and check your battery before requesting repair.
During the warranty period, any defective test tool can be returned to your Amprobe
distributor for an exchange for the same or like product. Please check the “Where to
Buy” section on www.Amprobe.com for a list of distributors near you. Additionally, in the
United States and Canada, in-warranty repair and replacement units can also be sent to an
Amprobe Service Center (see address below).
Non-warranty Repairs and Replacement – United States and Canada
Non-warranty repairs in the United States and Canada should be sent to an Amprobe Service
Center. Call Amprobe or inquire at your point of purchase for current repair and replacement
rates.
USA: Canada:
Amprobe Amprobe
Everett, WA 98203 Mississauga, ON L4Z 1X9
Tel: [phone] Tel: [phone]
Fax: [phone] Fax: [phone]

1
CT-53 3000 A Flexible 3-Sensor Current Transducer
CONTENTS
INTRODUCING THE CT-53 ................................................................................. 2
SYMBOL............................................................................................................. 4
SAFETY INFORMATION..................................................................................... 4
MEASUREMENTS............................................................................................... 5
MAINTENANCE.................................................................................................. 8
SPECIFICATIONS ................................................................................................ 8

2
INTRODUCING THE CT-53
The CT-53 Flexible 3-Sensor Current Transducer is an optional accessory that
is used to measure current up to 3000A on the Amprobe DM-5 Power Quality
Analyzer. The flexible and light weight measuring head is ideal for current
measurement on thick and hard to reach conductors without breaking the
circuit. The circuit box contains measuring circuits for 3-channel.
Cable
Circuit box
Current
range
indicator
Range selection
button
Output cable
Output terminal plug
Coupling point of the measuring head
Flexible measuring head

3
Pins of output terminal
Output signal
Power supply
Match the mark under CH No.
and mark on the Output Cable
and connect the Cable.
Output Connector
Output Terminal
②①
④③
⑥
⑤
2.7~5.5V
COM(Output(-))
Output(+)
②
④
⑥
①
③
⑤
2.7~5.5V
COM(Output(-))
Output(+)
• Output signal is between pin 3 and 5 of output terminal and between 4
and 6 of output connector.
• The current clamp is powered via pin 1 and 3 (2.7 to 5.5 V, 200 mA) of
output terminal and pin 2 and 4 of output connector.
• Resistance between 3 and 6 of Output terminal and between 4 and 5 of
Output connector is as stated below:
300A range: 910 kΩ
1000A range: 360 kΩ
3000A range: 510 kΩ
(Resistance cannot be measured while the instrument is powered off.)
• Connecting terminal on DM-5 is symmetrical to above pin
configurations.

4
SYMBOLS
Do not apply around, or remove from, HAZARDOUS LIVE
conductors.
Caution! Risk of electric shock.
WCaution! Refer to the explanation in this manual.
BAlternating current (AC).
TThe equipment is protected by double insulation or reinforced
insulation.
Underwriters Laboratories (applies to Canada and U.S.A.)
PComplies with European directives.
Cumple las normas australianas pertinentes
=Do not dispose this product as unsorted municipal waste.
Contact aqualified recycler.
SAFETY INFORMATION
The current transducer complies with:
• UL/IEC 61010-1, Measurement CAT III 600 V, Pollution degree 2
• IEC 61010-2-030
• IEC 61010-2-032
• EMC IEC 61326-1
CENELEC DIRECTIVES
The instruments conform to CENELEC Low-voltage directive 2006/95/EC and
Electromagnetic compatibility directive
2004/108/EC.
W Warning: Read before Using
To ensure safe operation and service of the current transducer, follow these
instructions:
• Read the operating instructions before use and follow all safety
instructions.
• Use the current transducer only as specified in the operating
instructions; otherwise the current transducer’s safety features may be
compromised.
• Adhere to local and national safety codes. Individual protective
equipment must be used to prevent shock and arc blast injury where
hazardous live conductors are exposed.

5
• Before each use, inspect the current transducer and its latching system
for any damage. Pay particular attention to the insulation surrounding
the flexible measuring head. Look for cracks or missing portions of the
current transducer housing or output cable insulation. Also look for
loose or weakened components.
• Do not use a current transducer that is cracked, damaged, or has a
defective cable.
• Never use the current transducer on a circuit with voltages higher than
600 V CAT III.
−CATIIIequipmentisdesignedtoprotectagainsttransientsin
equipment in fixed equipment installations, such as distribution
panels, feeders and short branch circuits, and lighting systems in
large buildings.
• De-energize the installation on which current will be measured or adopt
safe operating procedures during application and removal of the current
transducer.
• Use extreme caution when working around bare conductors or bus bars.
• Do not use the current transducer to measure bare conductors carrying a
voltage from 30V up to 600V unless you are wearing protective clothing
suitable for high-voltage work. Contact with the conductor could result in
electric shock. Always use appropriate equipment for personal protection.
• Use caution when working with voltages above 60 V dc, 30 V ac rms or
42 V ac peak. Such voltages pose a shock hazard.
• Never apply to current exceeding the measuring range.
• Ensure that no foreign object obstructs the latching mechanism.
• Do not operate the current transducer around explosive gas, vapor, or dust.
• Do not step on or pinch the cord. It may damage the insulation.
• Do not expose the current transducer to direct sunlight, high
temperatures/humidity or dew. It may cause deformation or insulation
degradation.
MEASUREMENTS
W Warning
To avoid electric shock or personal injury:
• Do not use the current transducer on a circuit with voltages higher than
600 V CAT III.
• De-energize the installation on which current will be measured or adopt
safe operating procedures during application and removal of the current
transducer.
• Disconnect CT-53 from DM-5 by removing CT-53 output terminal plug.
Do not pull CT-53 output cable.

6
To measure AC current:
1. Connect CT-53 output terminals to DM-5 current input terminals (A1, A2,
A3). Observe the arrow marks for correct connection.
2. Power on DM-5 (unit auto-detects the current transducer connected).
3. Unlock the flexible measuring head according to the followings:
Joint Sensor
1Press
2Unlock

7
4. Connect the flexible measuring head around the conductor.
5. Make sure the arrow marked on the measuring head coupling points
towards the current flowing direction of the conductor, and position the
conductor under test as shown below.
Note 1
Note 2
Note 2
Guide arrow mark
LoadSource
Note 1: Reference measurement position of the conductor. Maximum
coupling diameter: 20 mm for published accuracy.
Note 2: Keep minimum 65 mm to ensure published accuracy.
6. Ensure the coupling point of the flexible measuring head is firmly locked.
7. Press RANGE button to select any desirable range (300A/ 1000A/ 3000A).
When powering off the instrument once and powering on again,
the range will be the same one selected prior to powering off the
instrument.
W Caution
• The coupling point may
disconnect if excessive
pulling force is applied.
• Clamp onto one
conductor only.
Measurement cannot be
made when clamping
single-phase (2-wire) or
threephase (3-wire) at
the same time.

8
MAINTENANCE
Before each use, inspect the flexible current transducer and its latching
system for any damage for continued safety. Pay particular attention to the
insulation surrounding the flexible measuring head.
The flexible current transducer and its latching system require no special
care. Ensure that no foreign object obstructs the latching mechanism. Clean
the CT-53 with a damp cloth and a mild detergent. Do not use abrasives,
solvents, or alcohol.
If CT-53 does not perform properly, use the following steps to help isolate
the problem:
• Inspect the coupling system for any damage. If a foreign material is
present, the coupling system will not close properly and errors will
result.
• Inspect the cables between the flexible measuring head and CT-53
circuit box. Also inspect between the CT-53 circuit box and DM-5 for any
damage.
• Check the selected RANGE on the circuit box and ensure that the RANGE
indicator is ON.
• Verify the transducer setting on DM-5 is correct.
SPECIFICATIONS
Current range 300 A / 1000 A / 3000 A
AC rms
Output voltage
300 A range: 500 mVac / 300 Aac (1.67 mV / A)
1000 A range: 500 mVac / 1000 Aac (0.5 mV / A)
3000 A range: 500 mVac / 3000 Aac (0.167 mV / A)
Measuring range
300 A range: 30 A to 300 A (424 Apeak)
1000 A range: 100 A to 1000 A (1414 Apeak)
3000 A range: 300 A to 3000 A (4243 Apeak)
Conductor size Ø20 mm (0.787 in) maximum for published accuracy
Accuracy (sine wave)* ±1.0% (45 Hz to 65 Hz)
Phase characteristics
Within ±1o
300 A range: 30 A to 300 A (45 Hz to 65 Hz)
1000 A range: 100 A to 1000 A (45 Hz to 65 Hz)
3000 A range: 300 A to 3000 A (45 Hz to 65 Hz)

9
Working voltage 600 Vac rms
Max allowed input 3600 Aac continuous (45 Hz to 65 Hz)
Possible measurable
conductor size
Max. Ø150 mm (5.9 in) (accuracy error not
specified)
Head circumference 550 mm (21.65 in)
Head cable diameter 14.3 mm (0.56 in)
Cable length (head
to electronics) Approx. 2 m (6.56 ft)
Cable length
(output cable) Approx. 1 m (3.28 ft)
Output terminal Mini-DIN-6 connector
Output impedance 100 Ωor less
Current consumption
(at power supply 5 V) 15 mA (typical)
Operating
temperature and
humidity
32 oF to 122 oF (0 oC to 50 oC), ≤85 %RH (no
condensation)
Guaranteed accuracy at 73 oF ± 9 oF (23 oC ± 5 oC),
≤85 %RH (no condensation)
Storage temperature
and humidity
-4 to 140 oF (-20 oC to 60 oC), ≤85 % RH (no
condensation)
Operating altitude 0 to 2000 m
EMC EN 61326-1
Safety compliance
UL/IEC 61010-1, IEC 61010-2-030,
IEC 61010-2-032 Measurement CAT III 600 V,
Pollution degree 2
Certification P
Weight Approx. 950 g (2.1 lbs)
* See Note 1 and Note 2 on page 7 for reference measurement position of
the conductor.

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