1964_IMPORT_AND_EXPORT_(STRATEGIC_COMMODITIES)_REGULATIONS — Page 131

1988 Ed.]

Import and Export (Strategic Commodities) Regulations

[CAP. 60

G 131

[Subsidiary]

Technical Notes:

(1) For the purpose of this sub-item, a precision potentiometer means one having

a rated conformity better than:

(a) 0.25 per cent for a linear potentiometer; or

(b) 1 per cent for a non-linear potentiometer;

(2) This sub-item is not intended to embargo potentiometers using only switched

elements.

(k) Direct current and alternating current torquere, i.e. torque motors specially

designed for gyros and stablized platforms;

(1) Electro-optical devices designed to monitor relative rotation or remote surfaces; (j) Synchronous motors, as follows:

(1) Of size 20 (50.8 mm (2 inches) in diameter) and smaller and having syn-

chronous speeds in excess of 3 600 r.ß.m.;

(2) Designed to operate from power sources of more than 400 Hz;

(k) Analogue-to-digital and digital-to-apalogue converters other than digital volt-

meters or counters (see Item IL 1529), as follows:

(1) Electrical input type analogue-to-digital converters having any of the

following characteristics,

(1) A conversion rate of more than 200 000 complete conversions per second

at rated accuracy;

(ii) An accuracy in excess of 1 part in more than 10 000 of full scale over

the specified operating temperature range;

(iii) A figure of mert of Ix 108 or more (derived from the number of

complete conversions per second divided by the accuracy);

(2) Electrical input type digital-to-analogue converters having any of the

following characteristics:

(1) A maximum/setting time" of less than 3 microseconds for voltage output

devices and less than 250 nanoseconds for current output devices;

(ii) An accuracy in excess of 1 part in more than 10 000 of full scale over the

specified operating temperature range;

(iii) A figure of merit greater than 2 × 109 for voltage output convertors or 1 x 1010 for current output convertors (the figure of merit is defined as the reciprocal of the product of the maximum "settling time” in seconds and the accuracy);

(3) Solid-state synchro-digital or digital-to-synchro converters and resolver-to- digital or digital-to-resolver converters (including multi-pole resolvers) having a resolution of better than 1 part in 5 000 per full synchro revolution for single speed synchro systems or 11 part in 40000 for dual speed systems; (4) Mechanical input types (including but not limited to shaft-position encoders and inear displacement encoders, but excluding complex servo-follower systems), as follows:

(i)/Rotary types having an accuracy of better than 1 part in 40 000 of full

scale; or

(i) Linear displacement types having a resolution of better than ±5 micro-

meters;

Technical Note:

"Seftling time" in (k)(2)(i) above is defined as the time required for the output to come within one-half bit of the final value when switching between any two levels of the converters.

(1) Semiconductor Hall field probes, as follows:

(1) Made of indium-arsenide-phosphide (InAsP);

(2) Coated with ceramic or ferritic materials (e.g. special field probes such as

tangential field probes, multipliers, modulators, recorder probes, etc.);

(3) With an open circuit sensitivity greater than

0.12 vlts amperes x kilogauss

1