Atec M6204 User Manual

IEC Flicker Impedance

12KVA

Three Phase

16 Arms/Phase

IEC 60725 Compliant

M6204 IEC Flicker Impedance

Standard Features:

• Three Phase Flicker Impedance Network

Supports both single and three phase
icker testing of UUT’s up to 16Arms per
phase

• Z

Impedances Values per IEC 60725

ref

Line Impedance: 0.24 Ω+ 0.15 j

Neutral Impedance: 0.16 Ω + 0.10j

• Compatible with 360AMXT and 3120AMXT
AC Source Models

IEC Impedance is matched to AC Source
Output impedance for exact IEC 60725
matching

• High Qualify Impedance Components Used

Low Thermal Drift and Forced Air Cooling
while under Load Ensures Constant Flicker
Impedance during Long Flicker Test Runs

• Dual Connectors on Rear Panel

Multiple Terminal Blocks Provided for
Power, Voltage Sense and Power Analyzer
Connections Simplies Connections

• Standard 19” Rack Mount Enclosure

Fits easily on Lab Bench, on top of the AC
Power Source used or in an Instrument
Cabinet

Ω

Ω

Standards Supported:

• IEC 61000-3-3 / EN 61000-3-3

• IEC 61000-4-13 / EN 61000-4-13

• IEC 61000-4-27/ EN 61000-4-27

• IEC 60725

IEC Flicker Impedance

The M6204 unit provides the requisite lumped impedance between the AC Power
Source and the Unit Under Test (UUT) used to test for icker compliance to IEC 61000­3-3. Designed to meet IEC 60725 - Consideration of reference impedances and public
supply network impedances for use in determining the disturbance characteristics of
electrical equipment having a rated current ≤75 A per phase – the M6204 simulates
the typical public utility impedance characteristics found in most European countries
in order to provide a common icker measurement reference.

Three Phase and Single Phase UUT Testing

A separate impedance network in the Neutral leg ensures full compliance to IEC
61000-3-3 and IEC 60725 even under imbalanced three phase load conditions. The
same three phase Impedance network is also fully capable of supporting single
phase Flicker test. In this case, the Phase A impedance and Neutral impedance
combine together to provide the required Z
impedance.

= 0.40 Ω + 0.25 j Ω single phase

ref

Full 16 Arms per Phase Capable

The use of high quality components with low thermal drift and high saturation
resistance ensures a stable impedance network throughout the entire icker test
duration – typically two hours. This is augmented by ecient yet quiet forced
air cooling. Testing to the full 16 Arms per phase as required for products that
fall under the IEC 61000-3-3 Flicker Standard is fully supported by this lumped
impedance with ample margin for temporary overload conditions.

AC Source Matched

The M6204 impedance is factory calibrated and matched to the AMX AC Power
Source Model it is used with. This ensures that the combination of AC Source
Output Impedance and Lumped Impedance adds up to the requisite IEC 60725
Impedance values. This prevents unwanted system level errors that can occur
when the IEC Flicker Impedance is sourced from a dierent vendor as the AC
Power Source.

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IEC Flicker Impedance

Applications

Flicker Testing

The M6204 IEC Flicker Impedance provides the required lumped impedance to create a Flicker test system consisting of
a Programmable AC Power Source, an IEC compliant Flicker Meter or Power Analyzer with Flicker measurement mode
and the required lumped impedance between the AC Source and the UUT. The IEC Flicker standard is based on analyzing
voltage uctuations caused by changes in UUT load current working against a reference impedance (Z
sen to simulate the typical public utility impedance found in Europe. An incorrect or out of tolerance Flicker Impedance
can lead to signicant errors in Flicker measurement results.

Requirements for the IEC Flicker Impedance when testing UUT’s with Currents up to 75 Arms per phase are covered by
IEC Standard 60725, currently at revision 3.0. For UUT’s with phase currents of 16 Arms per phase or less (either single
or three phase UUT’s), the required Z
lowing nominal values:

is dened as a combination of resistive and inductive components with the fol-

ref

Phase Impedances: ZL = 0.24 + j0.15 Ω each phase

Neutral Impedance: ZN = 0.16 + j0.10 Ω

). Z

ref

was cho-

ref

For single phase applications, the Phase A and Neutral impedance combine to provide the required single phase Z
Z = 0.40 + j0.25 Ω so the same M6204 Impedance can be used for either single or three phase Flicker testing.

Other IEC Test Standards

The same IEC Flicker impedance is also called out to be used during other IEC Tests. Examples of some of these IEC Test
Standards are shown in the table below.

IEC Reference Descritption

IEC 61000-4-13 Harmonics and Inter Harmonics Immunity Test
IEC 61000-4-27 Unbalance, immunity test for equipment with input current not exceeding 16 A per phase

The M6204 Impedance is compatible with these IEC 61000-4 Immunity test standards.

Benets

High Quality

• The M6204 IEC Flicker Impedance is constructed of high quality resistive and inductive components sized to handle
load currents up to 16Arms with ease. Proper heat sinking and forced airow ensure stable operation over a wide
temperature range, even under full load conditions that can persist for many hours. The same impedance module
can be used for either Single phase or Three phase UUT Flicker testing without the need to rewire or re-congure.

Lumped Impedance

• Compared to “synthesized or electronic” impedance solutions as employed by some manufacturers, the M6204 pro­vides the required separate Neutral Impedance which is not available on AC Sources with synthesized impedance.
This ensures accurate Flicker measurement results under all circumstances, including unbalanced three phase load
conditions caused by the UUT.

• Furthermore, synthesized impedance circuits often have a limited frequency range and may closely approximate
the required impedance at 50Hz but will not accurately simulate the eect of higher current harmonic frequency
components present in UUT current for non-linear loads. A lumped impedance like the M6204 does not have such
a frequency dependency and will correctly respond to current harmonics.

ref

of

AC Source Matching

• Since most AC Power Sources have a non-zero output impedance, adding the lumped impedance to an AC Source
will have a cumulative eect resulting in an overall combined output impedance to the UUT that will exceed the ac­tual Z
test where it otherwise would have.

• By obtaining both the AC Power Source and the IEC Flicker Impedance from the same manufacturer, you can be
sure both are matched. This means the lumped impedance as well as the AC Source output impedance is adjusted
to ensure the combined impedance is within Z

value. This will result in overstated Flicker measurement results that may lead to an UUT not passing Flicker

ref

tolerances.

ref