►ADJUST COMMAND: The
ADJust command is used to adjust the Stroke output to
compensate for variation in loading caused by variation in HUDs
and the associated connection hardware. It is recommended
that an ADJUST be performed before each new HUD is tested.
A suitable warm up and stabilization for the HUD and Stroke
Generator should be permitted. The SE 1450 Stroke Generator’s
recommended warm up time is a minimum of 5 minutes.
CALIBRATION: Aligning the crosshairs of a Heads-Up Display
(HUD) with the gun boresight of an aircraft
Brightness may be a more accurate measurement of display luminance than Peak
Brightness because phosphor granularity and other variations can be
averaged. However the entire area being sampled must be illuminated for
effective measurement. The size of the area being sampled is user selected.
Brightness is a measurement of the luminance intensity of a line. The
brightest point in the cross section profile of the line is reported using
all of the luminance correction factors. The Peak Brightness can be
calculated using a single row of pixels across the line or an average of 16
or 64 lines of pixels. Averaging has the advantage of increasing the
accuracy of the measurement but can be misleading if the line is not
perpendicular to the detector axes.
Cathode Ray Tube
DASH is an acronym developed by Spectron to describe the equipment
designed for automated display testing. The DASH system is composed of
the Core DASH System, the DASH Fixturing, the DASH
Self-Alignment Systems and DASH Accessories. DASH
systems are capable of testing Head-Up Displays (HUDs), Heads-Down Displays (HDDs) and
Helmet-Mounted Displays (HMDs).
►EPROM: Erasable Programmable
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dictates that ownership and liability for the goods being shipped from
Spectron transfers to the buyer (including payment of all transportation and
insurance cost) as soon as it leaves our building.
►LINE WIDTH: The Camera can measure line
widths from a maximum of ~1.2 degrees to a minimum of ~0.05 degrees. This
is limited on the high side by the field of view and on the low side by the
pixel pitch of the detector. Lines smaller than 0.05 degrees can be
measured, at reduced accuracy, down to the absolute limit of ~0.015
Line Width can be calculated using a single row of pixels across the
line or an average of 16 or 64 lines of pixels. Averaging has the advantage
of increasing the accuracy of the measurement but can be misleading if the
line is not perpendicular to the detector axes.
RAMP: A voltage range in the altitude and azimuth axises represent the
position of the stroke display beam on the HUD. A linear ramp is the
change of voltage (in time) within one axis that essentially controls the
movement of stroke display beam within that axis. The rate of change
of the voltage remains constant within each linear ramp (there are
three different writing speeds: fast, slow and fail) and controls the
brightness of the image displayed on the HUD.
Attaining traceability through calibration by establishing a relationship
between the output of a measuring instrument and the value of a measurement
30: A form of trade credit which
specifies that payment is to be received within 30 days of the
delivery of goods.
TRACEABLE: The National Institute of
Standards and Technology (NIST) supplies industry,
academia and government with over 1,300 Standard Reference Materials (SRMs)
of the highest quality and metrological value. By using such materials
to perform our metrology and calibrations, Spectron's measuring systems can
be traced back to the NIST standards of measurement.
Refers to a one-time cost imposed upon a customer to cover the Time and
Materials required to develop a specific product
Parallax is a
measurement of the angular shift in the position of a line when the viewer’s
eye position is moved laterally. Parallax is an indication of the apparent
distance to the image. An image at an infinite distance will exhibit zero
parallax. A parallax measurement with the SE1420 DASH is performed by an
internal sequence of measurements: a Line Center, a shift in X or Y
position, another Line Center and a return to the original X or Y position.
built in to a Head-Up Display (HUD) to prevent the stroke display beam from
destroying the phosphor in the display. Such phosphor destruction can
occur if the stroke display beam moves too slowly, exposing the phosphor
plane to high levels of intensity.
MATRIX DETECTOR: A
two-dimensional camera detector that proportionally converts light into a
►POSITION (LINE CENTER):
measurement is a composite measurement in the SE1420 DASH system. The
position of a line in the Camera field of view is mathematically combined
with the position of the Altitude and Azimuth transports to get the final
angular position of the line. The Line Center can be calculated using a
single row of pixels across the line or an average of 16 or 64 lines of
pixels. Averaging has the advantage of increasing the accuracy of the
measurement but can be misleading if the line is not perpendicular to the
Spectron's procedure for calibrating the sensitivity of the detector across
& M (Time and Materials): A way to
quantify (in dollars) services rendered.
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