| Zugriffsnummer | 33754 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Improving the traceable measurement and generation of small direct currents |
| Autor(in); Institution |
Drung, Dietmar; 7.2, Kryophysik und Spektrometrie, PTB-Berlin
Götz, Martin; 2.6, Elektrische Quantenmetrologie, PTB-Braunschweig
Pesel, Eckart; 2.6, Elektrische Quantenmetrologie, PTB-Braunschweig
Scherer, Hansjörg; 2.6, Elektrische Quantenmetrologie, PTB-Braunschweig
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| Quelle/Jahr | IEEE Transactions on Instrumentation and Measurement: 64 (2015), 11, 3021 - 3030 |
| ISSN | 0018-9456 |
| DOI | |
| Verlag | New York, NY: IEEE |
| Freie Schlagworte | Amplifiers ; Calibration ; Electrical instruments ; Electric current measurement ; Electronic circuits |
| Zusammenfassung | We present the latest improvements in the traceable measurement and generation of small electric currents. A central tool in our traceability chain for small direct currents is a new binary CCC with a total of 18 276 turns. This 14 bit CCC is well suited for the calibration of high-value resistors and current amplifiers, but also for the direct amplification of small currents. A noise level of 5 fA/Hz at 0.05 Hz is routinely achieved. The systematic uncertainty due to noise rectification was exemplarily investigated in a ratio-error test configuration, showing that a total uncertainty of about one part in 106 can be achieved at 100 pA. For further improvement, a new instrument was developed, the ultrastable low-noise current amplifier (ULCA). Its transfer coefficient is highly stable versus time, temperature and current amplitude within the full dynamic range of 5 nA. The ULCA is calibrated with the 14 bit CCC at high current amplitude, and allows the measurement or generation of 100 pA direct current with an uncertainty of one part in 107. The novel setup was successfully used to investigate the uncertainty of the established capacitor charging method. A quantum metrology triangle experiment based on the presented instruments is proposed. |
| Kostenfreier Zugang | Open Access Hybrid |