Model #638-E649

Ammeter (NSN 6625-01-089-8955)

Special Features
Ruggedized
Description

2.170 inches nominal overall length, steel material, cadmium and chromate surface treatment.

Circuit Current For Which Designed
Dc
Mounting Hole Diameter
Between 0.146 inches and 0.166 inches
Overall Diameter
Between 3.480 inches and 3.520 inches
Environmental Protection
Shock resistant and vibration resistant
Mounting Bolt Circle Diameter
3.160 inches
Furnished Items And Quantity
Mounting hardware 9
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
Accuracy In Percent
-2.0/+2.0 at full scale single indicator single range
Meter Depth Behind Mounting Flange
Between 1.790 inches and 1.830 inches
Meter Body Diameter Behind Mounting Flange
Between 2.730 inches and 2.770 inches
Movement Type
Moving coil, permanent magnet
Background Color
White single indicator single range
Pointer Color
Black single indicator single range
Power Source
External
Mounting Facility Type And Quantity
3 screw and 3 unthreaded hole
Scale Graduation Type
Nonlinear single indicator single range
Measurement Range
-500.0/+500.0 microamperes, dc single indicator single range
Features Provided
Magnetic shield and zero adjuster
Movement Suspension Method
Jewel pivot base
Circuit Attachment Method And Quantity
2 solder lug and 2 threaded stud
Nuclear Hardness Critical Feature
Nonhardened
Style Designator
Round flush mtg
Fsc Application Data
Test set electronic
Description
Ammeter
Cage Code
77221

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Updated: 11/25/2024