EO530

EO POWER/AUTOMOTIVE - novembre | dicembre 2025 V Modi per ottimizzare: • Pendenza della rampa: più ripide sono le rampe, minore è la loro ampiezza • Durata della misura: più è lunga, maggiore è la quota di fun- zionamento in stato stazionario. La norma IEC 61851-23 stabilisce la pendenza minima della rampa affinché sia il più breve possibile per avere una ponderazione ragione- vole tra le fasi di salita, discesa e stato stazionario. La serie LMG600 fornisce misure DC precise e può essere fornita con un certificato di calibrazione rilasciato da un laboratorio accreditato DAkkS. L’inizio e la fine della misura sono essenziali per valutare se l’analizzatore e il contatore misurano lo stesso intervallo. Non tutti i produttori consento- no la verifica, né offrono la possibilità di sincronizzare l’analizzatore e il misuratore. Il nostro script Python garantisce la massima precisione. L’intervallo di corrente dell’LMG600 può essere esteso utilizzando i sensori della serie PCT di Danisense (alimentati dallo strumento), of- frendo una precisione in corrente continua di ± 0,0035%. Queste sonde di corrente sono disponibili da 200 Arms fino a 2.000 Arms (3.000 Apeak o in corrente continua) e oltre. Esempio: tolleranze per LMG671 con canale/i tipo S e trasduttori di corrente PCT200, intervallo di integrazione 1 s: Per ulteriori informazioni visita il sito: https://gouldgnsistemi.it/collections/zes-zimmer o chiedi agli esperti dell’azienda, scrivi a: https://gouldgnsistemi.it/pages/contact Segui le novità su Linkedin: https://www.linkedin.com/company/gould-g-n-sistemi/ MEASURING POINT PERROR LMG671-S PERROR PCT200 PERROR total,rel EERROR LMG671-S 700 V (DC) / 150 A (DC) ± 155.660 W ± 4.9 W ± 0.153 % ± 0.153 % Gould G.N. Sistemi, official distributor in Italy of Zes Zimmer, offers a range of high-precision power analyzer and current probes by Danisense. In this article, we explore an interesting use case Electrification of vehicles is driving rapid growth in charging stations, which must bill according to directive 2014/94/EU of the EU Parlia- ment. To ensure compliance, it is advisable to verify during R&D already. SETUP Charging stations are equipped with certified meters to measure total energy consumed and transfer billing data to the backend. The EU-type examination test for certification (“module B”) stipulates comparing the meter’s results at each port with a reference, e.g. a preci- se power analyzer like the LMG671: see diagram on the left. Charging currents of up to several 100 A require a very accurate sensor, like the flux-gate driven PCT. The meter's pulse output is con- nected to the LMG671, allowing it to capture all pulses to determine the metered energy. Measurement includes ramp up as well as the ramp down: see diagram on the left. Depending on power level and specified pulses/kWh of the meter, the shortest cycle time of 10 ms allows to count the pulses almost one by one. TEST BENCH INTEGRATION Zes Zimmer enables automation via script offering the following fun- ctions: • Data exchange : export of LMG600 output to your master software. • Evaluation : comparison of analyzer results with energy meter. • Measuring uncertainty calculation : for each cycle. • Export results: common formats. MEASURING UNCERTAINTY Overall deviation can be calculated for each measuring point as: Deviation = Deviation + Measuring uncertainty Overall energy meter power analyzer + current sensor Auto ranging can cause gaps in the measurements and is not recom- mended; it is better to manually pick a suitable range for each point. However, at the beginning of ramp up (or at the end of the ramp down), this increases specified error due to the range component: power error tolerance = ± (% of reading + % of range) Ways to optimize: • Ramp steepness : the steeper the ramps, the smaller their share. • Measurement duration : the longer, the larger the share of stea- dy-state operation. IEC 61851-23 stipulates minimum ramp steepness to keep them as short to have a reasonable weighting between ramp up, ramp down and steady state phases. The LMG600 series provides accurate DC measu- rement and can be delivered with a calibration certificate from a DAkkS accredited laboratory. Beginning and end of measurement are essential to judge whether analyzer and meter measure the same interval. Not all manufacturers allow verification, nor do they offer the means to sync analyzer and meter. Our Python script ensures maximum accuracy. The current range of the LMG600 can be extended using the PCT series sensors (powered by the instrument), offering a best DC accuracy of ± 0.0035 %. Those Plug’ n’ Measure sensors are available from 200 Arms up to 2000 Arms (3000 Apeak or DC) and beyond. Example: tolerances for LMG671 with S-channel/s and PCT200 current transducers, integration interval 1 s: see the table at the top of the page. SUCCESSFULLY AUTOMATING TYPE-EXAMINATION CERTIFICATION Errore calcolato dell'energia misurata LMG671 con ingressi tipo S con PCT200 Calculated error of measured energy LMG671 S-channel with PCT200