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Dec 1980

Volume 51, Issue 12, pp. 1603-1731

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Thermal interlock system with quick response time for high‐power magnetic coil systems

Y. Kubota, J. Kodaira, and A. Miyahara

Rev. Sci. Instrum. 51, 1722 (1980); http://dx.doi.org/10.1063/1.1136163 (2 pages)

Online Publication Date: 22 July 2008

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A thermal interlock system with a quick response time has been developed to protect high‐power magnetic coil systems from thermal overloads. In this system thermal sensors are directly attached to coils and are electrically connected to other components through isolation transformers. The response time of the interlock system is estimated to be less than 1.5 seconds.
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85.90.+h Other topics in electronic and magnetic devices and microelectronics (restricted to new topics in section 85)

Modified electrometer for constant current I–V measurements

J. M. Gallego, H. S. Reehal, and C. B. Thomas

Rev. Sci. Instrum. 51, 1724 (1980); http://dx.doi.org/10.1063/1.1136164 (2 pages)

Online Publication Date: 22 July 2008

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A simple circuit is described which when added to a commercial KEITHLEY electrometer (Model 610C) enables the instrument to be used for carrying out current–voltage measurements with any known and constant current, in the range 10−12–10−5 A, passing through a specimen and with up to 100 V dropped across it.
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07.50.-e Electrical and electronic instruments and components
07.50.Ek Circuits and circuit components

Device for deformation‐free electrolytic etching of thin specimens

H. Weerheijm, Th. H. de Keijser, and H. D. F. Meijer

Rev. Sci. Instrum. 51, 1725 (1980); http://dx.doi.org/10.1063/1.1136134 (2 pages)

Online Publication Date: 22 July 2008

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An easily constructed device is described that ensures deformation‐free electrolytic etching of thin (μm range) specimens and avoids elaborate and time‐consuming procedures. Essentially the device consists of a perforated electrode on which the specimen is held by maintaining a low pressure underneath. In addition the description of a valve assembly is given which is used for the recycling of the electrolyte that is sucked out of the bath through the holes in the electrode.
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81.65.-b Surface treatments
82.45.-h Electrochemistry and electrophoresis

Simple digital waveform averager for photon counting

A. Kono and S. Hattori

Rev. Sci. Instrum. 51, 1726 (1980); http://dx.doi.org/10.1063/1.1136135 (2 pages) | Cited 1 time

Online Publication Date: 22 July 2008

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A simple, digital, waveform‐averaging circuit is described for measuring very weak light signals by use of photon counting technique. The maximum time resolution of the circuit is 1.5 μs.
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07.60.Dq Photometers, radiometers, and colorimeters

Interface for Biomation transient recorders to LSI‐11 processors

Christopher Reiser

Rev. Sci. Instrum. 51, 1727 (1980); http://dx.doi.org/10.1063/1.1136136 (4 pages) | Cited 3 times

Online Publication Date: 22 July 2008

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An interface is described which permits high‐speed wordwise data transfer between a Biomation 820 Transient Recorder and a MINC (LSI‐11/2) minicomputer. Using a DRV11‐B direct‐memory access card, up to 50 full 2 K records/s can be transferred to the MINC system; single word control data can also be passed from the computer to the Transient Recorder.
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07.05.Hd Data acquisition: hardware and software
07.05.Kf Data analysis: algorithms and implementation; data management
07.05.Rm Data presentation and visualization: algorithms and implementation

Adapting a displex closed‐cycle helium refrigerator for ultrahigh vacuum operation

G. L. Fowler and J. A. Panitz

Rev. Sci. Instrum. 51, 1730 (1980); http://dx.doi.org/10.1063/1.1136137 (2 pages)

Online Publication Date: 22 July 2008

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A modification of a commercial closed‐cycle liquid helium refrigerator is described which permits operation at pressures below 10−9 Torr. By using a sapphire insulator on the low‐temperature stage, and incorporating vacuum‐compatible heating elements, samples can be biased to ±30 kV over a temperature range of 15–300 K.
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07.20.Mc Cryogenics; refrigerators, low-temperature detectors, and other low-temperature equipment
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