ASTM F1755M-96(2007)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
Designation: F1755M −96(Reapproved 2007) 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.
1. Scope 3. Terminology
1.1 This specification provides the requirements for design, 3.1 Definitions of Terms Specific to This Standard:
construction, performance, and testing of solid state bargraph-
3.1.1 accuracy, n—theaccuracyisanumberthatdefinesthe
type indicating meters.
limit of errors expressed as a percentage of full-scale value.
1.2 The solid state bargraph meters covered by this speci-
3.1.2 center-zero meter, n—meter with display mode char-
fication are intended for use in shipboard applications of
acterized by a sequentially illuminated string of LEDs starting
electrical measurement. This specification covers the require-
at the center scale zero position and extending in either
ments and quality assurance provisions for solid state, panel-
directionfromzero,proportionaltothepolarityandmagnitude
type (edgewise), and rectangular switchboard-type
of the input signal.
instruments, which use light-emitting diodes (LEDs) for bar-
3.1.3 dual bargraph display, n—two completely indepen-
graph indication and optional digital displays.
dent bargraph displays included in a single enclosure.
1.3 This specification’s requirements may be invoked for
3.1.4 end-scale value, n—the value of the actuating electri-
specialized measurement applications where another quantity,
for example, position, weight, concentration of a trace element cal quantity that corresponds to end scale indication. When
zero is not at the end or at the electrical center of the scale, the
inanatmospheresample,andsoforth,isconvertedtoelectrical
energy for display and measurement. Special dial markings higher value is used. See Table 1.
shall be specified for such cases.
3.1.5 end-zero meter, n—meter with display mode charac-
1.4 The values stated in metric units are to be regarded as
terized by a sequentially illuminated string of LEDs starting
the standard. The values given in parentheses are for informa-
from a zero point, normally at the left for switchboard-style
tion only.
metersorhorizontallyinstallededgewisemeters,orthebottom
of vertically installed edgewise meters, that extends in the
2. Referenced Documents
direction of full-scale value.
2.1 ASTM Standards:
3.1.6 full-scale value, n—full-scalevalueisthelargestvalue
B117Practice for Operating Salt Spray (Fog) Apparatus
of the actuating electrical quantity, which can be indicated on
D3951Practice for Commercial Packaging
the scale. For instruments with zero between the ends of the
F1166Practice for Human Engineering Design for Marine
scale,thefull-scalevalueisthearithmeticsumofthevaluesof
Systems, Equipment, and Facilities
the actuating electrical quantity corresponding to the two ends
2.2 Federal Specifications:
of the scale.
TT–E–529 Enamel, Alkyd, Semigloss, Low VOC Content
3.1.7 response time, n—the response time is the time re-
2.3 Federal Standards:
quired for the indicating means to display a new value after a
H28Screw Thread Standards for Federal Services
step change has occurred in the measured quantity to a new
constant value.
This specification is under the jurisdiction ofASTM Committee F25 on Ships
3.1.8 scale division, n—a scale division is the increment
and Marine Technology and is the direct responsibility of Subcommittee F25.10 on
between the centers of two consecutive scale marks. The
Electrical.
number of scale marks is one more than the number of scale
Current edition approved May 1, 2007. Published June 2007. Originally
approved in 1996. Last previous edition approved in 2002 as F1755M-96(2002). divisions. For example, 10 scale divisions require 11 scale
DOI: 10.1520/F1755M-96R07.
marks.
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
3.1.8.1 linear scale divisions, n—linear scale divisions are
Standards volume information, refer to the standard’s Document Summary page on
scale divisions that are spaced an equal distance apart and of
the ASTM website.
the same value, for example, scale divisions spaced 5 A apart
AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
Robbins Ave., Philadelphia, PA 19111–5098, ATTN: NPODS. on a 100–A meter.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F1755M − 96 (2007)
TABLE 1 End-Scale Values
5.1.4 Style of display (single or dual, digital display) (see
End-Scale Values 4.3).
Range End-Scale Values
(for Ratings)
5.1.5 Window type (plastic or shatterproof glass) (see 7.5).
0-150 0, 150 150
5.1.6 Dial colors (see 7.9.1.1).
50-0-150 50, 150 150
5.1.7 Range(s) (see 7.9.2).
150-0-150 150, 150 150
90-140 90, 140 140
5.1.8 Power supply voltage (see 8.1.1).
5.1.9 Signal input (analog or digital) (see 8.1.2).
5.1.10 Color(s) of bargraph display (see 8.2.2).
5.1.11 Optional features available:
3.1.8.2 nonlinear scale divisions, n—nonlinear scale divi-
5.1.11.1 Anti-glare windows (see 7.5.1).
sions are scale divisions of the same value spaced an unequal
5.1.11.2 Splashproof or spraytight window (see 7.5.2).
distance apart.
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:
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.
5.1.14 Testing requirements (include only if tests other than
4. Classification
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 me-
cal properties.
ters,thescalemarkingshallbespecifiedeitherforaverticalor
6.1.3 Glass—Glass used for the meter window shall be the
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
6.2 Manufacture:
of light-emitting diode (LED) elements that illuminate to
6.2.1 Finishes:
produce a bar image proportional to the input signal. The
6.2.1.1 External Finishes—The portion of the meter case
display designation defines whether the meter has single or
exposed to view from the front of the panel or switchboard
dual bargraph displays.
shall have a black semigloss finish. No nickel or bright
4.3.2 Digital Display—The digital display designation de-
trimmings shall be used. The external finish may be epoxy-
fines the number of digits in the digital display as follows:
coated, electro-coated, or painted in accordance with
4.3.2.1 3-digit display.
1 TT–E–529.Metalcasesshallberenderedresistanttocorrosion
4.3.2.2 3 ⁄2-digit display.
prior to the application of the final finish.
4.3.2.3 4-digit display.
1 6.2.1.2 Internal Finishes—Internal finishes shall be of a
4.3.2.4 4 ⁄2-digit display
material that shall not melt, crack, chip, blister, or scale as a
4.3.2.5 No digital display.
result of the tests specified herein.
5. Ordering Information
6.3 Threaded Parts—Threaded parts shall be in accordance
5.1 Purchase orders or inquiries for bargraph meters of this with FED-STD-H28. Where practical, threads shall be in
specification shall specify the following: conformitywiththecoarse-threadseries.Thefine-threadseries
5.1.1 Title, date, and year of this specification. shall be used only for applications that might show a definite
5.1.2 Quantity. advantage through their use. Where a special diameter pitch
5.1.3 Typeandforedgewisemeter,theorientation(see4.2). combination is required, the thread shall be of American
F1755M − 96 (2007)
FIG. 1 Rectangular/Switchboard/Type Meters
F1755M − 96 (2007)
FIG. 2 Dimensional Characteristics of Edgewise Meters
F1755M − 96 (2007)
National Form and of any pitch between 16 and 36 which is 7.7 AuxiliaryComponents—Allconnectionsfromtheshunts
used in the fine-thread series. and resistors to the input terminals of the meters shall be
6.3.1 Locking of Screw-Thread Assemblies —Screw-thread insulated to prevent shock hazard.
assemblies shall not loosen as a result of the tests specified
7.8 External Accessories—External shunt, shunt leads,
herein. When practicable, split-type lockwashers or equivalent
transformers, resistors, and other external accessories shall be
means shall be provided under all nuts.
furnished when required.
6.4 Sealing—The meter case shall be sealed by means of
7.9 Meter Scales:
gaskets, by fusing or soldering metal-to-metal or metal-to-
7.9.1 Dial—Thedialshallbemadeofstiffmaterialandshall
glass, or other means which will enable the meter to withstand
be supported and secured firmly to the meter.
the tests specified herein.
7.9.1.1 Dial Colors—The meter dial shall have white mark-
7. Design and Construction
ings on a black background as standard.
7.9.1.2 Dial Markings—Dial legend markings shall be
7.1 Dimensional Data—Typical physical dimensions for
sharply defined and visible from the front of the case but not
switchboard and edgewise meters are shown in Fig. 1 and Fig.
distract attention from the scale markings. Unless otherwise
2.
specified,thefollowinginformationshallbemarkedonthedial
7.2 Mounting—Bargraph meter shall be front panel
or on an attached nameplate.
mounted to simplify mechanical installation or removal for
(a) Manufacturer’s name.
service, or both. Electrical connections locations shall be
(b) Units of measurement.
designed to facilitate meter removal.Typical mounting dimen-
(c) The quantity producing end-scale deflection. For end-
sions are indicated in Fig. 1 and Fig. 2.
zerometers,thedialmarkingsshallbeFS,indicatingfullscale,
7.2.1 Mounting Hardware—The necessary mounting hard-
followed by the full-scale value and units of measurement, for
ware, such as mounting clips, nuts, washers, bolts, shall be
example, FS-50 mV). For meters that are not end-zero meters,
supplied with each meter. The machine screws shall have the
the dial markings shall be marked ES indicating end scale
same finish as the external finish (see 6.2.1.1).
followed by the end-scale value and units of measurement, for
7.3 Maintainability—The meter shall be constructed so that
example, ES-50 mV).
no special tools are required for insertion or removal of the
7.9.2 Ranges—For end-zero meters, the full-scale ranges
meter.
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
measured or any decimal multiple or submultiple of these
7.5 Windows—The meter display shall be provided with a
numbers.
window of methyl methacrylate (MMA), polycarbonate (PC),
7.9.3.1 Linear Scales—The total number of scale divisions
or shatterproof glass. If the window is made MMAor PC, the
external surface shall be treated to resist scratching. The shall be determined by dividing the total range by the smallest
increment. For example; a 150-V scale with the smallest
window shall be free from detrimental defects that would
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 effects, scratches, chips, cracks, or craze.
sions shall be determined by dividing the total range by the
7.5.1 Anti-Glare Coatings—When anti-glare is specified, smallest increment, although to avoid crowding scale marks, a
windows shall be coated with an anti-glare coating. The portion of the scale shall not be marked. For example, a 100-A
coating shall be uniform in quality and condition, clean, scale with the smallest increment of 2 A, but with no marks
smooth, and free from foreign materials. The coating shall between 0 and 10 A, is listed as having 50 scale divisions.
shownoevidenceofflaking,peeling,orblistering.Thecoating
7.9.4 Scale Visibility—The scale and characters shall be
shall not contain blemishes such as discolorations, stains,
uniform visually in character brightness, legibility, and clean-
smears, and streaks. The coating shall show no evidence of a
linessofdisplaywithallelementsofthemeterilluminated.The
cloudy or hazy appearance.
entire meter scale shall be clearly visi
...