EMC

Now in its second generation, the ADAPTIVE POWER EMC Compliance Test Systems use a greatly enhanced harmonics and flicker measurement system and newly designed flicker impedance options to support single and three phase AC harmonics, flicker and immunity compliance testing up to the maximum required current of 75A per phase. 

 

The new measurement systems uses a USB interface to the user's laptop or desktop eliminating the need for an integrated PC, monitor and keyboard compared to previous generation Harmonics and Flicker test systems. 

 

AC power to the unit under test is still supplied by a Pacific Power Source AMX Series high performance linear power source for systems up to 16A/ phase. For higher power systems up to 75A/phase, the compact and effi¬cient AFX Series switch mode power source is used. The AC power output of these units easily exceeds the IEC 61000-3 standard requirements for the AC source. 

 

All tests are computer controlled to eliminate operator errors and ensure consistent applications of the required test in full compliance with the IEC standards. Data is collected to the PC drive for record keeping and a com¬prehensive test report is generated at the end of the test. The windows based software uses intuitive graphical control elements to select the cor¬rect test mode and displays data in real time, while the test is in progress.
 

Choice of Lumped Impedance Networks

Fluctuating Harmonics Test Software
The single phase and three phase harmonics and flicker mea­surement modules (HFMM-1 / HFMM-3) are controlled by the Hfa or Hfa75 control software which fully implements the lat­est IEC 61000-3-2 & -3-12 Harmonics test standards. The HFMM is a precision power measurement instrument that can be cer­tified to ISO17025 by an accredited lab. The software guides the operator through all necessary steps and acquires, displays and reports on the results. Data is displayed in real-time during the test so the operator can monitor progress and interrupt the test if needed without having to wait till the end of the test run.

This eliminates time wasted testing if something is not right with the equipment under test.

The screen below shows the current harmonics of the EUT during a test run. Color is used to highlight peak values, aver­age values and IEC test limit values. This helps diagnosing pos­sible causes on equipment that does not pass early on. Since all acquired data is recorded, the user has the ability to scroll back and forth through time, frame by frame, to narrow in on any failure condition.

Flicker Test Software
Flicker tests are set up and executed using the same logical step process shown for Harmonics. Both IEC 61000-3-3 and -3-11 standards are supported. Since flicker tests may have to run for up to two hours, the real time display of intermediate measurements data such as short term flicker (Pst) and instan­taneous flicker sensations (IFS) can be helpful in predicting the possible outcome of the test early on. This helps reduces wast­ed time on tests that will fail.

AC Power Source Compliance
Annex A, section A.2 of the IEC 61000-3-2 Harmonics test stan­dard defines the minimally acceptable AC source requirements that have to be met during the test. Section 6.3 of the IEC 61000-3-3 Flicker standard does the same for Flicker testing. If the power source used for these tests does not meet these requirements, the results will be understated and a unit under test may pass where it otherwise would have failed.
The table to the bellow lists the requirements from the IEC stan­dard as well as the actual performance specification of the AMX and AFX Series AC power sources. The AMX and AFX both exceed all requirements and represent some of the highest performing programmable AC power source for Harmonics and Flicker testing available.

AC source requirements for IEC 61000-3-11 and -3-12 are more relaxed than those shown in the table so the AFX also meets these to support up 86A/phase.

The compliance of the AC source with these requirements is monitored during harmonics testing by the power analyzer and this information is available as part of the test report.

Lumped Flicker Impedance + HFMM
The requisite lumped impedance required during voltage flick­er testing is included as part of the test system. Either a single phase impedance or a three phase impedance is installed, de­pending on system configuration. Flicker Impedances for IEC 61000-3-3 of 16A rms per phase and for IEC 61000-3-11 up to 75A rms per phase is available.

Note that the HFMM hardware can be integrated in the LFZ chassis so the HFMM chassis is eleminated when ordering an ECTS2 system with any LFZ flicker impedance.
 
Voltage Dips Transfer Switch Option
The IEC VOLTAGE DIPS module uses solid state electronic transfer switch technology to meet the IEC 61000-4-11 and IEC 61000- 4-34 Test requirement for voltage dips and short interruptions with voltage slew rates less than 5 usec. This allows full compli­ance testing of equipment for CE compliance.

IEC 61000-4 Voltage Dips
The EPTS Series of Electronic Power Transfer Switches are de­signed to support full-compliance voltage dip testing for any dip level. It requires the use of AC mains or fixed AC generator for the nominal 100% or 130% test level and a programmable AC power source for the dip level needed. For IEC 61000-4-29 DC Dips and Variations testing an APS DCS Series DC power supply is required.

Power Connections
All power connections are made at the rear panel of the EPTS chassis. There are no user controls on the front other than the power On/Off switch. Status and Error indicators are provided for each phase. The EPTS generates a phase sync signal from the AC Main input to synchronize the programmable AC source. All control of the programmable AC power source and the EPTS is done using the included Windows IEC Test software.