Design and metrological applications of a low noise, high electrical isolation measurement unit

We present the design and electrical characteristics of an active low-pass filter. It will be used in a reference waveform source based on a programmable Josephson voltage standard with multilevel delta-sigma modulation to generate accurate and spectrally pure arbitrary waveforms. The filter has a fifth-order Butterworth characteristic with high input impedance, low distortion, high stopband attenuation, and stable passband performance, including dc.

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“…We used the totem-pole (TP) filter architecture [8] to construct a fifth-order Butterworth filter [ Fig. 1(a)].…”

Section: Circuit Designmentioning

confidence: 99%

An Active Filter for Delta-Sigma-Modulated Josephson Waveforms

Bergsten

Eklund

Tarasso

et al. 2015

IEEE Trans. Instrum. Meas.

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“…Each bridge module (1 to 4, figure 1) has a common design of control circuit board, providing optical isolation between the modules and between the bridge and the controlling computer [14]. It contains two 18-bit digital to analogue converters, two 16-bit analogue to digital converters, a 512 kB memory for data storage and a microcontroller for automation of basic measurement functions.…”

Section: Details Of the Electronicsmentioning

confidence: 99%

“…The modules have been designed for low power operation so that they can be operated from isolated power supplies [14] and low noise generation so that they do not interfere with the sensitive SQUID and nanovolt amplifier systems. Each module has two isolated supplies, one for digital power and one for analogue, and the four modules are powered by a common 24 V dc supply derived from the mains supply (not shown in figure 1).…”

Section: Details Of the Electronicsmentioning

confidence: 99%

An automated cryogenic current comparator resistance ratio bridge for routine resistance measurements

et al. 2010

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A design of an automated cryogenic current comparator (CCC) resistance ratio bridge for routine measurements in a national metrology institute or standards laboratory is described. It employs a type II CCC for use in a low loss liquid helium storage vessel and can be continuously operated from the mains power via specialized isolated supplies. All parameters including the servo control loops are digitally controlled. Noise sources in the system are analysed using the Allan deviation and it is demonstrated that non-white noise sources can be eliminated by choosing an appropriate current reversal rate.

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“…Figure 14 shows the operation approaches of the NPL dynamic bridge standard (Fig. 14a) as described in [12] and the PTB dynamic bridge standard (Fig. 14b) [13].…”

Section: Wp 4: Measuring Amplifiersmentioning

confidence: 99%

Traceable dynamic measurement of mechanical quantities: objectives and first results of this european project

Bartoli

Beug

Bruns

et al. 2012

Int. J. Metrol. Qual. Eng.

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Abstract. Nine european national metrology institutes (NMIs) are collaborating in a new project funded by the european metrology research programme (EMRP) to establish traceable dynamic measurement of the mechanical quantities force, pressure, and torque. The aim of this joint research project (JRP) is to develop appropriate calibration methods, mathematical models, and uncertainty evaluation. The duration of the project is 3 years for a global amount of e3.6 million. It began in September 2011.

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Design and metrological applications of a low noise, high electrical isolation measurement unit

Cited by 12 publications

References 8 publications

An Active Filter for Delta-Sigma-Modulated Josephson Waveforms

An Active Filter for Delta-Sigma-Modulated Josephson Waveforms

An automated cryogenic current comparator resistance ratio bridge for routine resistance measurements

Traceable dynamic measurement of mechanical quantities: objectives and first results of this european project

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