ASTM F1755M-96(2012)e1

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
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Designation: F1755M −96 (Reapproved 2012) An American National Standard
Standard Specification for
Solid State Bargraph Meters for Shipboard Use [Metric]
This standard is issued under the fixed designation F1755M; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
ε NOTE—Reapproved with editorial changes in October 2012.
1. Scope F1166Practice for Human Engineering Design for Marine
Systems, Equipment, and Facilities
1.1 This specification provides the requirements for design,
2.2 Federal Specifications:
construction, performance, and testing of solid state bargraph-
TT–E–529Enamel, Alkyd, Semigloss, Low VOC Content
type indicating meters.
2.3 Federal Standards:
1.2 The solid state bargraph meters covered by this speci-
H28Screw Thread Standards for Federal Services
fication are intended for use in shipboard applications of
electrical measurement. This specification covers the require- 3. Terminology
ments and quality assurance provisions for solid state, panel-
3.1 Definitions of Terms Specific to This Standard:
type (edgewise), and rectangular switchboard-type
3.1.1 accuracy, n—theaccuracyisanumberthatdefinesthe
instruments, which use light-emitting diodes (LEDs) for bar-
limit of errors expressed as a percentage of full-scale value.
graph indication and optional digital displays.
3.1.2 center-zero meter, n—meter with display mode char-
1.3 This specification’s requirements may be invoked for
acterized by a sequentially illuminated string of LEDs starting
specialized measurement applications where another quantity,
at the center scale zero position and extending in either
for example, position, weight, concentration of a trace element
directionfromzero,proportionaltothepolarityandmagnitude
inanatmospheresample,andsoforth,isconvertedtoelectrical
of the input signal.
energy for display and measurement. Special dial markings
3.1.3 dual bargraph display, n—two completely indepen-
shall be specified for such cases.
dent bargraph displays included in a single enclosure.
1.4 The values stated in metric units are to be regarded as
3.1.4 end-scale value, n—the value of the actuating electri-
the standard. The values given in parentheses are for informa-
cal quantity that corresponds to end scale indication. When
tion only.
zero is not at the end or at the electrical center of the scale, the
1.5 This international standard was developed in accor-
higher value is used. See Table 1.
dance with internationally recognized principles on standard-
3.1.5 end-zero meter, n—meter with display mode charac-
ization established in the Decision on Principles for the
terized by a sequentially illuminated string of LEDs starting
Development of International Standards, Guides and Recom-
from a zero point, normally at the left for switchboard-style
mendations issued by the World Trade Organization Technical
metersorhorizontallyinstallededgewisemeters,orthebottom
Barriers to Trade (TBT) Committee.
of vertically installed edgewise meters, that extends in the
direction of full-scale value.
2. Referenced Documents
3.1.6 full-scale value, n—full-scalevalueisthelargestvalue
2.1 ASTM Standards:
of the actuating electrical quantity that can be indicated on the
B117Practice for Operating Salt Spray (Fog) Apparatus
scale. For instruments with zero between the ends of the scale,
D3951Practice for Commercial Packaging
the full-scale value is the arithmetic sum of the values of the
actuating electrical quantity corresponding to the two ends of
the scale.
This specification is under the jurisdiction ofASTM Committee F25 on Ships
and Marine Technology and is the direct responsibility of Subcommittee F25.10 on
3.1.7 response time, n—the response time is the time re-
Electrical.
quired for the indicating means to display a new value after a
Current edition approved Oct. 1, 2012. Published November 2012. Originally
step change has occurred in the measured quantity to a new
approved in 1996. Last previous edition approved in 2007 as F1755M–96 (2007).
DOI: 10.1520/F1755M-96R12E01.
constant value.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on Available from DLA Document Services, Building 4/D, 700 Robbins Ave.,
the ASTM website. Philadelphia, PA 19111-5094, http://quicksearch.dla.mil.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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F1755M − 96 (2012)
TABLE 1 End-Scale Values
4.3.2.4 4 ⁄2-digit display
End-Scale Values 4.3.2.5 No digital display.
Range End-Scale Values
(for Ratings)
0-150 0, 150 150
5. Ordering Information
50-0-150 50, 150 150
150-0-150 150, 150 150
5.1 Purchase orders or inquiries for bargraph meters of this
90-140 90, 140 140
specification shall specify the following:
5.1.1 Title, date, and year of this specification.
5.1.2 Quantity.
3.1.8 scale division, n—a scale division is the increment
5.1.3 Type, and for edgewise meter, orientation (see 4.2).
between the centers of two consecutive scale marks. The
5.1.4 Style of display (single or dual, digital display) (see
number of scale marks is one more than the number of scale
4.3).
divisions. For example, 10 scale divisions require 11 scale
5.1.5 Window type (plastic or shatterproof glass) (see 7.5).
marks.
5.1.6 Dial colors (see 7.9.1.1).
3.1.8.1 linear scale divisions, n—linear scale divisions are
5.1.7 Range(s) (see 7.9.2).
scale divisions that are spaced an equal distance apart and of
5.1.8 Power supply voltage (see 8.1.1).
the same value, for example, scale divisions spaced 5 A apart
5.1.9 Signal input (analog or digital) (see 8.1.2).
on a 100–A meter.
5.1.10 Color(s) of bargraph display (see 8.2.2).
3.1.8.2 nonlinear scale divisions, n—nonlinear scale divi- 5.1.11 Optional features available:
sions are scale divisions of the same value spaced an unequal
5.1.11.1 Anti-glare windows (see 7.5.1).
distance apart.
5.1.11.2 Splashproof or spraytight window (see 7.5.2).
5.1.11.3 Internal illumination (see 7.6).
3.1.9 scale length, n—the scale length is the length of the
5.1.11.4 External accessories (see 7.8).
path described by the pattern of the LEDs in moving from one
5.1.11.5 Alarm set points (see 8.1.4).
end of the scale to the other. For multiple scale meters, the
5.1.11.6 Digital display (see 8.2.4)
longest scale shall be used to determine the scale length.
5.1.11.7 Nonstandard range values (see 8.2.4).
3.1.10 scale visibility, n—scale visibility is the maximum
5.1.11.8 Dot matrix display types (see 8.2.4).
horizontal or vertical viewing angle measured from a line
5.1.11.9 Intensity control (see 8.2.5).
normaltothescalefromwhichallscalemarksandarcs,butnot
5.1.12 Certification requirements (see 10).
necessarily all markings, may be seen.
5.1.13 Packaging requirements.
4. Classification
5.1.14 Testing requirements (include only if tests other than
the production tests required by this specification are to be
4.1 Classification—Bargraph meters covered in this speci-
performed).
fication shall be classified by type and style as specified in 4.2
– 4.3.
6. Materials and Manufacture
4.2 Type—The type designation defines the physical con-
6.1 Materials—All materials used in the construction of
figuration of the meter and the scale.
these bargraph meters shall be of a quality suitable for the
4.2.1 Rectangular/switchboard-type meters present angular
purpose intended and shall conform to the requirements of this
displays from 90 to 270° scale for the measured parameter(s).
specification.
Fig. 1 provides typical dimensional and mounting data for
6.1.1 Metals—Metals and the treatment of metals shall be
rectangular/switchboard-type meters.
corrosion-resistant.
4.2.2 Edgewise/panel-type meters present linear displays
6.1.2 Plastics—Plastic,whenused,shallbesuitablethermo-
for measured parameters. Fig. 2 provides typical dimensional
plastic or thermosetting material so molded as to produce a
and mounting data for edgewise type meters.
dense solid structure, uniform in texture, finish, and mechani-
4.2.2.1 Orientation of Meter—For edgewise/panel-type
cal properties.
meters,thescalemarkingshallbespecifiedeitherforavertical
6.1.3 Glass—Glass used for the meter window shall be the
or horizontal mounting condition.
shatterproof type.
4.3 Style—The style designation defines the meters display
6.1.4 Gaskets—Material used in gaskets shall not cause
attributes as follows:
corrosion of metal parts with which they come in contact.
4.3.1 Bargraph Display—Thebargraphdisplayshallconsist
of light-emitting diode (LED) elements that illuminate to 6.2 Manufacture:
6.2.1 Finishes:
produce a bar image proportional to the input signal. The
display designation defines whether the meter has single or 6.2.1.1 External Finishes—The portion of the meter case
dual bargraph displays. exposed to view from the front of the panel or switchboard
4.3.2 Digital Display—The digital display designation de- shall have a black semigloss finish. No nickel or bright
fines the number of digits in the digital display as follows: trimmings shall be used. The external finish may be epoxy-
4.3.2.1 3-digit display. coated, electro-coated, or painted in accordance with
4.3.2.2 3 ⁄2-digit display. TT–E–529.Metalcasesshallberenderedresistanttocorrosion
4.3.2.3 4-digit display. prior to the application of the final finish.
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F1755M − 96 (2012)
FIG. 1 Rectangular/Switchboard/Type Meters
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F1755M − 96 (2012)
FIG. 2 Dimensional Characteristics of Edgewise Meters
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F1755M − 96 (2012)
6.2.1.2 Internal Finishes—Internal finishes shall be of a 7.5.1.1 Specular Reflectance—The coating reflectance shall
material that shall not melt, crack, chip, blister, or scale as a be not greater than 0.6% for energy incident on the surface at
result of the tests specified herein. an angle of 0 to 15° inclusive. The reflectance shall be not
greater than 1.0% at an angle of 30°.
6.3 Threaded Parts—Threaded parts shall be in accordance
7.5.1.2 Light Loss—The coating light loss shall be not
with FED-STD-H28. Where practical, threads shall be in
greater than 2.0%.
conformitywiththecoarse-threadseries.Thefine-threadseries
7.5.2 Splashproof/Spraytight Windows —When specified,
shall be used only for applications that might show a definite
splashproof or spraytight windows shall be furnished.
advantage through their use. Where a special diameter pitch
7.6 Internal Illumination—When specified, meters shall be
combination is required, the thread shall be of American
equipped with internal illumination provided by a minimum of
National Form and of any pitch between 16 and 36 which is
two lamps, so placed to illuminate the dial evenly.
used in the fine-thread series.
6.3.1 Locking of Screw-Thread Assemblies —Screw-thread
7.7 AuxiliaryComponents—Allconnectionsfromtheshunts
assemblies shall not loosen as a result of the tests specified
and resistors to the input terminals of the meters shall be
herein. When practicable, split-type lockwashers or equivalent
insulated to prevent shock hazard.
means shall be provided under all nuts.
7.8 External Accessories—External shunt, shunt leads,
6.4 Sealing—The meter case shall be sealed by means of
transformers, resistors, and other external accessories shall be
gaskets, by fusing or soldering metal-to-metal or metal-to-
furnished when required.
glass, or other means which will enable the meter to withstand
7.9 Meter Scales:
the tests specified herein.
7.9.1 Dial—Thedialshallbemadeofstiffmaterialandshall
be supported and secured firmly to the meter.
7. Design and Construction
7.9.1.1 Dial Colors—The meter dial shall have white mark-
7.1 Dimensional Data—Typical physical dimensions for ings on a black background as standard.
switchboard and edgewise meters are shown in Fig. 1 and Fig.
7.9.1.2 Dial Markings—Dial legend markings shall be
2. sharply defined and visible from the front of the case but not
distract attention from the scale markings. Unless otherwise
7.2 Mounting—Bargraph meter shall be front panel
specified,thefollowinginformationshallbemarkedonthedial
mounted to simplify mechanical installation or removal for
or on an attached nameplate.
service, or both. Electrical connections locations shall be
(a)Manufacturer’s name.
designed to facilitate meter removal.Typical mounting dimen-
(b)Units of measurement.
sions are indicated in Fig. 1 and Fig. 2.
(c)The quantity producing end-scale deflection. For end-
7.2.1 Mounting Hardware—The necessary mounting
zerometers,thedialmarkingsshallbeFS,indicatingfullscale,
hardware,suchasmountingclips,nuts,washers,bolts,shallbe
followed by the full-scale value and units of measurement (for
supplied with each meter. The machine screws shall have the
example, FS-50 mV). For meters that are not end-zero meters,
same finish as the external finish (see 6.2.1.1).
the dial markings shall be marked ES indicating end scale
7.3 Maintainability—The meter shall be constructed so that followed by the end-scale value and units of measurement (for
example, ES-50 mV).
no special tools are required for insertion or removal of the
meter. 7.9.2 Ranges—For end-zero meters, the full-scale ranges
shall be as specified. For meters that are not end-zero meters,
7.4 Cases—Cases shall be corrosion resistant. Cases shall
thecenterandend-scalerangesshallbespecifiedappropriately.
be designed and constructed with close-fitting joints to mini-
7.9.3 ScaleDivisions—Unlessotherwisespecified,thevalue
mize the entrance of dust and moisture (see 6.4).
of each scale division shall be one, two, or five of the units
7.5 Windows—The meter display shall be provided with a
measured or any decimal multiple or submultiple of these
window of methyl methacrylate (MMA), polycarbonate (PC), numbers.
or shatterproof glass. If the window is made MMAor PC, the
7.9.3.1 Linear Scales—The total number of scale divisions
external surface shall be treated to resist scratching. The
shall be determined by dividing the total range by the smallest
window shall be free from detrimental defects that would
increment. For example; a 150-V scale with the smallest
prevent the display from being easily read or from meeting the
increment of 5 V is listed as having 30 scale divisions.
luminous distribution and color requirement. Such defects
7.9.3.2 Nonlinear Scales—The total number of scale divi-
include electrostatic
...