Model #HFM2

Electrical frequency meter (NSN 6625-00-391-8894)

Special Features
Self contained
Description

2.350 inches maximum overall length, plastic material.

Circuit Current For Which Designed
Ac
Dielectric Withstanding Voltage In Volts
2600.0
Center To Center Distance Between Mounting Facilities Parallel To Length
2.740 inches
Center To Center Distance Between Mounting Facilities Parallel To Width
2.373 inches
Overall Height
3.500 inches
Overall Width
3.500 inches
Scale Division Quantity
50 single indicator single range
Frequency Rating
60.0 hertz
Mounting Stud Length
0.500 inches
Shortest Horizontal Distance Between Mounting Centers
1.370 inches
Furnished Items And Quantity
Nut 4; washer 4
Indicator Type
Dial w/pointer
Installation Design
Panel
Mounting Arrangement Style
Three hole/stud triangular
Frequency Response Range
+25.000/+400.000 hertz
Frequency Response Range
+25.000 to 400.000 hertz
Dial Scale Marking Color
Black single indicator single range
Accuracy In Percent
-3.0/+3.0 at full scale single indicator single range
Accuracy In Percent
-3.0 to 3.0 at full scale single indicator single range
Meter Depth Behind Mounting Flange
1.210 inches
Meter Body Diameter Behind Mounting Flange
2.700 inches
Movement Type
Moving iron vane
Background Color
White single indicator single range
Pointer Color
Black single indicator single range
Power Source
External
Mounting Facility Type And Quantity
3 threaded stud
Scale Graduation Type
Linear single indicator single range
Measurement Range
+55.0/+65.0 hertz single indicator single range
Measurement Range
+55.0 to 65.0 hertz single indicator single range
Mounting Stud Diameter
0.112 inches
Scale Selection Method
Terminal
Features Provided
Zero adjuster
Movement Suspension Method
Jewel pivot base
Circuit Attachment Method And Quantity
2 threaded stud
Operating Voltage Rating In Volts
240.0 ac
Phase
Single
Nuclear Hardness Critical Feature
Nonhardened
Special Test Features
Meets ansi specification c-39.1
Style Designator
Rectangular flush mtg
Fsc Application Data
Test set, elect. Equip.
Description
Meter,electrical Frequency
Cage Code
7F761

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Updated: 05/03/2024