Model #637-16750

Electrical frequency meter (NSN 6625-00-004-8066)

Special Features
Terminal no. 1/4-28 in. Thd 0.620 in. Lg
Description

2.060 inches nominal overall length.

Circuit Current For Which Designed
Dc
Mounting Hole Diameter
Between 0.143 inches and 0.157 inches
Mounting Stud Length
Between 0.375 inches and 0.625 inches
Overall Diameter
3.510 inches
Mounting Bolt Circle Diameter
3.160 inches
Indicator Type
Dial w/pointer
Installation Design
Panel
Mounting Arrangement Style
Three hole/stud bolt circle
Dial Scale Marking Color
Black single indicator single range
Meter Depth Behind Mounting Flange
1.660 inches
Meter Body Diameter Behind Mounting Flange
2.800 inches
Background Color
White single indicator single range
Mounting Facility Type And Quantity
3 unthreaded hole
Measurement Range
+0.0/+160.0 volts, ac single indicator 2nd range
Measurement Range
+0.0 to 133.0 volts, ac single indicator 1st range
Measurement Range
+0.0 to 160.0 volts, ac single indicator 2nd range
Scale Selection Method
Terminal
Features Provided
Zero adjuster
Circuit Attachment Method And Quantity
2 threaded stud
Special Markings
Percent rated current, double width red line at 0.75 amps for 60 hzscale, double width blue line at 0.625 amps for 50 hz scale
Nuclear Hardness Critical Feature
Hardened
Style Designator
C1 round flush mtg
Style Designator
Round flush mtg
Description
Meter,electrical Frequency
Cage Code
77221

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Updated: 11/24/2024