METREL A 1783 User manual

Mini AC current clamps 20/200 A
A 1783
Instruction manual
Version 1.1.1; Code No. 20 753 286

2
Distributor:
Manufacturer:
Metrel d.o.o.
Ljubljanska cesta 77
SI-1354 Horjul
Slovenia
e-mail: [e-mail]
https://www.metrel.si
Mark on your equipment certifies that it meets requirements of all subjected EU regulations
Hereby, Metrel d.o.o. declares that the A 1783 is in compliance with subjected EU
directives. The full text of the EU declaration of conformity is available at the
following internet address https://www.metrel.si/DoC.
Mark on your equipment certifies that it meets requirements of all subjected UK regulations.
Hereby, Metrel d.o.o. declares that the A 1783 is in compliance with subjected UK
regulations. The full text of the UK declaration of conformity is available at the
following internet address https://www.metrel.si/UK-DoC.
© 2023 METREL
The trade names Metrel®, Smartec®, Eurotest®, Auto Sequence®are trademarks registered in Europe and
other countries.
No part of this publication may be reproduced or utilized in any form or by any means without
permission in writing from METREL.

A 1783 Mini AC current clamps 20/200 A Table of contents
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Table of contents
1General Description............................................................................................4
1.1 Typical applications ......................................................................................4
2Safety and operational considerations .............................................................5
2.1 Warnings and notes......................................................................................5
2.2 Standards applied.........................................................................................6
3Current clamp operation.....................................................................................7
4Inspection............................................................................................................8
5Cleaning...............................................................................................................8
6Service and Calibration ......................................................................................8
7Technical specifications.....................................................................................9

A 1783 Mini AC current clamps 20/200 A General Description
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1 General Description
The A 1783 current clamps are designed for measuring alternating currents on insulated
conductors on low power installations: 50 mA ÷ 200 A. They are designed for Metrel Power Quality
Instruments MI 2893 / MI 2892 / MI 2885 / MI 2884 / MI 2883.
The current transducer is housed in a plastic case that maintains double insulation. Parts are
shown on figure bellow:
1) handles,
2) safety barrier,
3) conductor opening,
4) clamps jaw,
5) cable connection with connector,
6) range selection switch.
Figure 1: A 1783 current clamps
1.1 Typical applications
Power Quality Measurement
The A 1783 current clamps have linear response through wide frequency bandwidth.
Therefore, they are well suited for:
–Power Quality auditing,
–EN 50160 or troubleshooting. Particularly for:
oCurrent distortion measurement
oInrush measurement
oHarmonics measurement for frequency
oFunctional testing of appliances, machines, etc.
High precision and measurement range up to 30 A / 260 A can cover most current measurements
on the secondary side of current transformer (CT) without opening of current circuit.
Energy and Power Measurement
The A 1783 current clamps have small phase shift over wide frequency range. Therefore, they are
well suited for:
–Power and energy measurements (active, reactive, apparent)
–Power factor measurements
–Power/Energy efficiency

A 1783 Mini AC current clamps 20/200 A Safety and operational considerations
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2 Safety and operational considerations
2.1 Warnings and notes
In order to maintain the highest level of operator safety while carrying out various tests and
measurements Metrel recommends keeping your A 1783 Mini AC current clamp in good condition
and undamaged. When using the A 1783, consider the following general warnings:
❑The symbol on the A 1783 means »Read the Instruction manual with special
care for safe operation«. The symbol requires an action!
❑If the test equipment is used in a manner that is not specified in this Instruction
manual, the protection provided by the equipment might be impaired!
❑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.
❑Before each use, inspect the A 1783 Current Clamp and its latching system for any
damage. Pay particular attention to the insulation surrounding the jaw. Look for
cracks or missing portions of the clamp housing or output cable insulation. Also
look for loose or weakened components. Don't use current sensor if the wear
indicator of the cable connection is visible.
❑Do not use a clamp that is cracked, damaged, or has a defective cable.
❑Do not use the A 1783 Current Clamp to measure bare conductors carrying a voltage
higher than 30 V ac rms or 42 V ac peak.
❑Never use the clamp on a circuit with voltages higher than 300 V CAT II (insulated
conductors).
❑De-energize the installation on which current will be measured or adopt safe
operating procedures during application and removal of the current clamp.
❑Use extreme caution when working around bare conductors or bus bars (follow the
requirements of EN 50191).
❑Do not apply around or remove from UNINSULATED HAZARDOUS LIVE
conductors, which may render electric shock, electric burn, or arc flash.

A 1783 Mini AC current clamps 20/200 A Safety and operational considerations
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Markings on the A 1783:
Symbol
Description
Read the Instruction manual with special care to safety operation«.
The symbol requires an action!
Do not apply around or remove from HAZARDOUS LIVE conductors.
Mark on your equipment certifies that it meets requirements of all
subjected EU regulations.
Mark on your equipment certifies that it meets requirements of all
subjected UK regulations.
This equipment should be recycled as electronic waste.
2.2 Standards applied
The A 1783 Current Clamp is manufactured and tested in accordance with the following
regulations:
Electromagnetic compatibility (EMC)
EN 61326 - 1
Electrical equipment for measurement, control and laboratory use
–EMC requirements –Part 1: General requirements
EN 61326 - 2 - 2
Electrical equipment for measurement, control and laboratory use
–EMC requirements –Part 2-2: Particular requirements - Test
configurations, operational conditions and performance criteria for
portable test, measuring and monitoring equipment used in low-
voltage distribution systems
Safety (LVD)
EN 61010 - 1
Safety requirements for electrical equipment for measurement,
control and laboratory use –Part 1: General requirements
EN 61010 - 2 - 032
Safety requirements for electrical equipment for measurement,
control and laboratory use –Part 2-032: Particular requirements for
hand-held and hand-manipulated current sensors for electrical test
and measurement
Note about EN and IEC standards:
❑Text of this manual contains references to European standards. All standards of EN
6XXXX (e.g. EN 61010) series are equivalent to IEC standards with the same number
(e.g. IEC 61010) and differ only in amended parts required by European harmonization
procedure.

A 1783 Mini AC current clamps 20/200 A Current clamp operation
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3 Current clamp operation
Step 1
Connect A 1783 Current Clamps to the desired input on the measuring instrument.
Step 2
Clamp the probe around the insulated current-carrying conductor(s) to be measured. Make
sure that probe jaws are tightly closed around the conductor(s). In the case of measuring
current near live, naked conductor(s), remove electrical power from wires, before clamping
(follow the requirements of EN 50191).
Figure 2: Current clamps A 1783- connection to the measuring instrument
LOADSOURCE
current direction
indicator
Figure 3: Current clamps proper position
Position the clamp with the current direction indicator pointing toward the load side. If install the
clamp in the opposite direction, the phase displacement will deviate 180 degrees.
Step 3
Select Phase and Neutral clamps to A 1783 in Connection setup menu on your instrument.
Select proper Clamps range on the PQA (same as it was selected on the clamps Step 2).
Step 4
Observe the current value and waveform on the instrument’s display.

A 1783 Mini AC current clamps 20/200 A Inspection, Cleaning, Service & Calibration
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4 Inspection
To maintain operator safety and ensure reliability of the A 1783 Current Clamp, it is good practice
to inspect it on a regular basis. Check that the enclosure and optional connection are without
defects such as scratches or breaks.
Jaw surface must be clean. Pollution on jaw surfaces reduces the current clamp sensitivity.
5 Cleaning
No special maintenance is required for the housing. To clean the surface of the A 1783 use a soft
cloth slightly moistened with soapy water or alcohol. Then leave the A 1783 to dry totally before
use.
Warnings:
❑Do not use liquids based on petrol or hydrocarbons!
❑Do not spill cleaning liquid over the A 1783!
6 Service and Calibration
It is essential that your clamp is regularly calibrated in order to guarantee the technical
specification listed in this Instruction manual. We recommend 2-year calibration interval. Metrel
encloses an original calibration certificate with every new instrument and clamp.
For recalibration and repairs under or out of warranty time please contact your distributor for
further information.
Warning:
❑Only a competent, authorized person is allowed to carry out service intervention!

A 1783 Mini AC current clamps 20/200 A Technical specifications
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7 Technical specifications
Nominal current (INom)...................................20 A / 200 A
Nominal current range ..................................5 % INom … 100 % INom
Maximal current (IMax) ...................................30 A / 260 A
Output signal .................................................10mV/A (20 A range)
1mV/A (200 A range)
Bandwidth .....................................................45 Hz …60 Hz
Uncertainty....................................................±(0,5 % of reading + 0,02 % FS)
Phase Error ....................................................±≤0,5°(45 –5 kHz)
External fields................................................30 A/m (No influence)
Continuity of measurements.........................20 A (continuous)
30 A (40 min / 20 min intermitted)
Dimensions & Mechanical data:
Current sensor type.......................................D
Length of connection cable ...........................1.5 m
Jaw opening...................................................24 mm
Maximum conductor sizes.............................fi < 24 mm
Dimensions (W x H x L).................................. 64 mm x 130 mm x 26 mm
Weight ..........................................................300 g
Safety specification:
Over-voltage category...................................600 V CAT III
Pollution degree ............................................2
Degree of protection.....................................IP 40
EMC:
Emission.........................................................Class B
Immunity .......................................................Portable equipment
Environment conditions:
Working temperature range .........................-15 °C … 50 °C
Storage temperature range...........................-20 °C … 60 °C
Humidity range..............................................0 %RH …80 %RH
Reference temperature range.......................25 C ± 5 C @ 40 %RH …60 %RH
Altitude..........................................................up to 2000 m
Operation ......................................................Indoor use
Substitute Electric Model for A 1783 Mini AC current clamps 20/200 A
Equivalent circuit diagram for current clamp measurement:
Instrument
Im
IV
Is
1:2500
Figure 4: A 1783 Mini AC current clamps 20/200 A - block diagram
Symbols on circuit diagrams have following meaning:
Im
Measured (AC) current, primary current
Is
Secondary transformer current