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 torque motors, i.e. torque motors specially
designed for gyros and stabilized platforms;
(l) 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 synchronous
speeds in excess of 3,600 r.p.m.;
(2) Designed to operate from power sources of more than 400 Hz;
(k) Analogue-to-digital and digital-to-analogue converters other than digital voltmeters
or counters (see Item IL 1529), as follows:
(1) Electrical input type analogue-to-digital converters having any of the
following characteristics,
(i) 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 merit of 1 × 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:
(i) A maximum "settling 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 converters or
1 × 1010 for current output converters (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 1 part in 40,000 for dual speed systems;
(4) Mechanical input types (including but not limited to shaft-position encoders
and linear 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
(ii) Linear displacement types having a resolution of better than ±5 micro-
meters;
Technical Note:
"Settling 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.
(l) 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 volts amperes × kilogauss