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MIL-M-16125C
METERS, ELECTRICAL, FREQUENCY
Year: 1963
Abstract: This specification covers switchboard and portable electrical frequency meters for use in presenting visually the frequency of 60 or 400 cycle per second electric power system by a marked dial and pointer.
The type designation of meters shall be in the following form, and as specified (see 3.24 and 6.2):![CHART]()
Meters covered by this specification are designated by the two letter symbol "MR".
The style is designated by a two-digit number which signifies the following characteristics:
The first digit designates the normal size and shape of flange on switchboard meters, as follows:
4 - 4-½ inch, rectangular flange
6 - 6 inch, rectangular flange
The first digit designates the accuracy classification of portable meters, as follows:
1 - 1.5 percent
The second digit designates the type of mounting and the scale length in angular degrees, as follows:
8 - Flush mounting, 90 degree scale
9 - Flush mounting, 250 degree scale
The second digit designates the voltage rating, as follows:
1 - 115 volts
2 - 230 volts
8 - 115 and 230 volts
The color scheme of the dial background, markings and pointer is designated by a single letter, as follows:
B - Black dial background, white markings and pointer.
W - White dial background, black markings and pointer.
The center scale frequency shall be designated as follows:
60 - For meters designed for a center scale frequency of 60 cycles per second.
400 - For meters designed for a center scale frequency of 400 cycles per second.
The frequency range shall be designated by a single letter, as follows:
A - 59 to 61 cycles per second
B - 55 or 56 to 65 cycles per second
C - 390 to 410 cycles per second
D - 350 to 450 cycles per second
A single letter shall designate special features, as follows:
H - High-impact-shock resistant.
The type designation MR49W60AH signifies:
(a) MR - Electrical frequency meter.
(b) 49 - 4 ½ inch rectangular flange, switch-board meter, flush mounting, 250 degree scale.
(c) W - White dial background with black markings and black pointer.
(d) 60 - Center scale frequency of 60 cycles per second.
(e) A - Frequency range of 59 to 61 cycles per second.
(f) H - High-impact-shock resistant.
The type designation MR11W400 C signifies:
(a) MR - Electrical frequency meter.
(b) 11 - 1.5 percent accuracy class portable meter with voltage rating of 115 volts.
(c) W - White dial background with black markings and black pointer.
(d) 400 - Center scale frequency of 400 cycles per second.
(e) C - Frequency range of 390-410 cycles per second. Intended Use: Switchboard meters are intended for use in general application of electrical measurement including shipboard and land installations. High-impack-shock-resistant meters are preferred for shipboard use. Portable meters are suitable for shipboard use as primary and secondary standards; however, they are intended for use in other applications in which the specified accuracy is sufficient for the required measurements. More accurate meters, generally designed as laboratory standards, are not covered by this specification.
The type designation of meters shall be in the following form, and as specified (see 3.24 and 6.2):
Meters covered by this specification are designated by the two letter symbol "MR".
The style is designated by a two-digit number which signifies the following characteristics:
The first digit designates the normal size and shape of flange on switchboard meters, as follows:
4 - 4-½ inch, rectangular flange
6 - 6 inch, rectangular flange
The first digit designates the accuracy classification of portable meters, as follows:
1 - 1.5 percent
The second digit designates the type of mounting and the scale length in angular degrees, as follows:
8 - Flush mounting, 90 degree scale
9 - Flush mounting, 250 degree scale
The second digit designates the voltage rating, as follows:
1 - 115 volts
2 - 230 volts
8 - 115 and 230 volts
The color scheme of the dial background, markings and pointer is designated by a single letter, as follows:
B - Black dial background, white markings and pointer.
W - White dial background, black markings and pointer.
The center scale frequency shall be designated as follows:
60 - For meters designed for a center scale frequency of 60 cycles per second.
400 - For meters designed for a center scale frequency of 400 cycles per second.
The frequency range shall be designated by a single letter, as follows:
A - 59 to 61 cycles per second
B - 55 or 56 to 65 cycles per second
C - 390 to 410 cycles per second
D - 350 to 450 cycles per second
A single letter shall designate special features, as follows:
H - High-impact-shock resistant.
The type designation MR49W60AH signifies:
(a) MR - Electrical frequency meter.
(b) 49 - 4 ½ inch rectangular flange, switch-board meter, flush mounting, 250 degree scale.
(c) W - White dial background with black markings and black pointer.
(d) 60 - Center scale frequency of 60 cycles per second.
(e) A - Frequency range of 59 to 61 cycles per second.
(f) H - High-impact-shock resistant.
The type designation MR11W400 C signifies:
(a) MR - Electrical frequency meter.
(b) 11 - 1.5 percent accuracy class portable meter with voltage rating of 115 volts.
(c) W - White dial background with black markings and black pointer.
(d) 400 - Center scale frequency of 400 cycles per second.
(e) C - Frequency range of 390-410 cycles per second. Intended Use: Switchboard meters are intended for use in general application of electrical measurement including shipboard and land installations. High-impack-shock-resistant meters are preferred for shipboard use. Portable meters are suitable for shipboard use as primary and secondary standards; however, they are intended for use in other applications in which the specified accuracy is sufficient for the required measurements. More accurate meters, generally designed as laboratory standards, are not covered by this specification.
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