Harmonics and flicker measuring instruments for the evaluation of three-phase and single-phase equipment of 16 A and above.
The KHA3000 is a model that, in addition to the compatible standards and functions of the popular KHA1000, is equipped with the IEC 61000-3-12 (harmonics) and IEC 61000-3-11 (flicker and voltage fluctuation) standards required for harmonic and flicker standard tests of single- and three-phase equipment exceeding 16 A. This model enables high-precision, simultaneous three-phase measurements of up to 40 A/phase using only this unit. In addition to a real-time display that can be used like an *1 oscilloscope or FFT analyser, it is of course also equipped with a real-time standard judgement function. This model alone can perform everything from standards determination to test report creation without the need for a PC.
For example, it is possible to carry the unit close to large equipment and carry out tests*2 and obtain a pass/fail decision on the spot, thus dramatically saving the time required for standards testing. Of course, it can also be used to measure single-phase equipment and standards of 16 A or less. By combining an AC power supply and line impedance network, it is possible to easily construct a standards compliance test system. In addition, our KHA series is compatible with three measurement technology standards, so that measurements can be made with the latest standards including inter-order harmonics, or with only integer harmonics as before, all in one unit. *1 The JIS specifies 20A / phase or less.
*2 For measurement of 40 A or more phase current, an optional device (external current sensor) is required.
Complied standards
Compliance with the following standards can be tested.
*1 The measuring window width is 0.2 second. In other words, it is 10 cycles at a fundamental frequency of 50Hz and 12 cycles at a fundamental frequency of 60Hz. Interharmonic waves are measured at 5Hz intervals. Harmonic groups are measured out of harmonic waves and interharmonic waves. The values of harmonic groups are the results of measurement.
*2 The measurement window length is 16 cycles at the fundamental frequency. It is 0.32 second at a fundamental frequency of 50Hz and 0.266 second at a fundamental frequency of 60Hz. Interharmonic waves are not measured; only harmonic waves are measured. The values of harmonic waves are the results of measurement.
User-friendly terminals and interfaces
You can change the test conditions with the monitor screen unchanged.
KHA Series comes standard with GPIB, RS232C and USB.
Features
Complied with the old and new versions of harmonic measuring instrument standards IEC61000-4-7
The choice of standards is divided into limit value standards and measuring instrument technical requirements standards, which can be freely recombined (only pre-made combinations are available for KHA1000).
No need for a PC for compliance testing
Using this device alone, you can perform a series of test processes – from setting test conditions and running the test to judging test results against limit values and outputting result reports – without the use of a PC. The device displays pass/fail results and spectrum data on the screen in real time. What’s more, since KIKUSUI’s PCR-LE/LE2 Series AC power supply can be controlled from KHA Series, you can set up an easy-to-use test system whereby the operation panel of this device can be used as the main console.
Supporting “repeatability” check
Comparison can be made between the present measurement data and the past measurement data to check whether or not the error is within the specified allowable range. This feature is helpful in evaluating the “repeatability” that is required in harmonic compliance testing.
The IEC requirementsThe measurement repeatability shall be within ±5% of limit value. IEC61000-3-12:The repeatability of the fundamental and 7th and lower harmonic orders shall be within ±5%. The repeatability of the harmonics beyond the 7th harmonic order shall be within ±10% or ±1% of the reference fundamental current, whichever is larger.
Equipped with a quality check function for the testing power supply
KHA Series are equipped with a function to measure the voltage, frequency, peak voltage and distortion rate of the AC power used for harmonic compliance testing in order to check whether or not the power supply is adequate for the intended test.
The IEC requirementsIEC61000-3-2:The voltage harmonics must be the following values or less. 3rd (0.9%), 5th (0.4%), 7th (0.3%), 9th (0.2%), even harmonic order between 2nd and 10th (0.2%), 11th to 40th (0.1%)
IEC61000-3-12: Output voltage and harmonic inclusion rate under no load 5th (1.5%), 3rd and 7th (1.25%), 11th (0.7%), 9th and 13th (0.6%), even harmonic orders between 2nd and 10th (0.4%), 12th and 14th to 40th (0.3%)
Capable of simultaneous measurement of the three-phases *Only Model KHA3000
The long-time flicker value in all segment time, “Plt” is specified to be 2 hours for the flicker monitoring period. For three-phase equipment, measurement can be taken for each phase, but that will take 2 hours x 3 = 6 hours. Simultaneous measurement of three-phases can shorten the measuring (testing) time to 2 hours.
In order to fully cover the EUT input methods, you can set the wiring method (single phase, single phase 3-wire, three-phase 3-wire and three-phase 4-wire). In addition, for the setting of L1, L2 and L3 (channels), you can select interlock or independent. This allows appropriate measurement for equipment with largely different phase currents.
In order to support measurement of each channel for 3 phases, the voltage and current ranges were separated for each channel and AUTO range was established for each. In addition, you can adjust the DC offset for each range with a single touch.
Real-time display measurement that gives you a quick grasp of the EUT status
List of view types *The screens are examples of KHA3000
Easy to upgrade when standards are revised (to comply with the latest standards).
The unit can be easily upgraded from the front panel using a CF card.*Users are requested to prepare CF cards.
Basic measurements are also taken care of.
Voltage/current/power/power factor/apparent power/reactive power/frequency can also be measured. Waveform monitoring, inrush current measurement and harmonic current measurement in the low-frequency band are also possible, making it a convenient tool for daily work at development and design sites.
Inrush current measurement
The inrush current waveform above the trigger level is observed. Voltage waveforms can also be observed: the KHA3000 can measure inrush currents up to 160 Apeak and the KHA1000 up to 80 Apeak. With a commercially available clamp-on probe (voltage output type) and firmware updates, even higher currents can be measured.
The inrush current can be measured while the EUT is connected. This eliminates the need for a separate oscilloscope or current probe. Inrush current measurements with good reproducibility can be made by setting the AC power input phase angle using the application software (SD006-KHA, SD005-KHA) and turning it ON. The phase angle can be set in 1° increments.
About ISO/IEC 17025 calibration Provided with calibration/data (measuring equipment in use)
In order to meet the customers’ request for traceabity of the calibration of KHA Series for ISO/IEC17025, we have established the “traceability system” as shown in the figure below. (It is used for the production and inspection of KHA1000/3000.) When the “Certificate of traceability with Calibrator Data” is requested, a copy of the “Calibration Certificate” can be also attached as achargeable option. (issued by the organizations shown in yellow in the figure).
That KIKUSUI cannot calibrate KHA1000/3000 in compliance with ISO/IEC17025. Thus, the calibration data for KHA Series that can be provided at the moment does not contain of “the Expression of Uncertainty”. A copy of the data that contains of “the Expression of Uncertainty” for the measuring instruments used for calibration can be attached as a chargeable option.
If you need data issued by accredited calibration laboratories (with the logos), please contact our sales representatives.
If you require data issued by an accredited calibration institute (with logo/mark), please contact our sales representative.
The large current CT (Current Transformer) for the KHA3000
Application example of the combination system with other manufacture’s equipment
Use the terminal “I Monitor” and “V Monitor” on the back of RIN.*In order to satisfy the voltage drop of 0.5Vrms in the measurement specified in the IEC61000-4-7 Ed2 , it is recommended that the wiring between the OUTPUT and the SOURCE terminal of the KHA series must be connected short and use the thick cable as possible.
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