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Company Profile-- Spotlight on
John Chubb Instrumentations is located in Cheltenham in the UK. Cheltenham is on the British Isles between Birmingham and Bristol.
The business of John Chubb Instrumentation is electrostatic measurements. This incudes the development, manufacture and marketing of instruments as well as test and consultancy work for customers.
John
states:
John
states that, "Our products aim to provide the capability to people
in industry and research to measure a wide range of electrostatic parameters
with ease, confidence and good precision. Our products cover the need
to measure electrostatic conditions (electric fields, charge, surface
and volume voltage, surface and volume charge density) and to assess
the suitability of materials (charge decay time and capacitance loading).
Some instruments have been developed for use in John
Chubb Instrumentation
JCI Developments : -
Electrode configurations for magnetic movement and electrostatic containment
of arc roots in high power vacuum interrupters. - Monte Carlo modelling of free molecular gas flow in complex vacuum systems - Concept and demonstration of novel monitor for respirable size airborne fibres - Development of electrostatic 'field mill' fieldmeters which do not require earthing of the rotating choppers - Development of instrumentation for charge decay measurement - Demonstration of comparable charge decay performance betwen corona and tribo charging - Proposal of concept of 'capacitance loading' as an additional way to assess the electrostatic suitability of materials
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An
Anglo-Saxon settlement, Cheltenham - possibly from Celtenhomme, 'the
town under the hill' - was the site of a monastery as early as 803.
Alfred the Great wrote admiringly of the peace of the settlement on
the banks of the River Chelt, and by the 13th century Cheltenham was
noted for its fairs and markets.
Why
Cheltenham? John previously worked in Cheltenham and knew there were
a number of good people in the area. Having family in Birmingham, Cheltenham
and Bristol, he knew he couldn't go wrong with Cheltenham. John states
that, "there are good technical and professional resources there,
good communications by road and rail and a nice town with plenty of
cultural activities of various sorts during the year." 
John
Chubb set up JCI in September 1983. John had worked in a variety of
areas over the years - electrostatic aspects of dust collection, high
power vacuum interrupters, cryopumping of hydrogen on helium cooled
surfaces, Monte Carlo modeling of free molecular gas flow. With the
aim to provide high quality, high performance instrumentation for electrostatic
measurements as well as consultancy in electrostatics, JCI was formed.
JCI first
product was the JCI 101 electrostatic
fieldmeter. This provided much higher useable sensitivity
than was available elsewhere. Attachments were soon added to enable
this basic electric field measurement capability to be used to measure
charge, with the JCI 151 Faraday Pail,
and to measure discrete voltages, with the JCI
148 
electrostatic
voltmeter. Starting in 1987, JCI developed the JCI
155 Charge Decay Test Unit. Work since then has been enhancing
the performance, ease of use and facilities of instrumentation based
on these early designs. All the product development work has been supported
by a good deal of investigative work that has been reported at conferences
and in published papers.
adverse
environmental conditions (JCI 131 fieldmeter,
JCI 501 Lightning Warning System). We have not developed
instruments that are already widely available, but on those that we
feel provide approaches that are appropriate measurements. (For this
reason we do not make any resistance or resistivity measuring instruments
- there are plenty around and they do not provide the information needed
to assess the suitability of materials!). Our instruments are used in
a wide variety of industries all over the world by specialist and non-specialist
staff and their performance is backed by a formal calibration service
(see BS 7506: Part 2: 1996)."
