Model: 21FX4B52

Electrical Frequency Meter

Properties:

Circuit Current For Which Designed
Ac
Overall Length
2.297 inches
Mounting Hole Diameter
0.125 inches
Frequency Rating
50.0 hertz
Overall Diameter
2.688 inches
Mounting Bolt Circle Diameter
2.438 inches
Furnished Items And Quantity
Term. Hdw 2
Indicator Type
Vibrating reed
Installation Design
Panel
Register Quantity
1
Mounting Arrangement Style
Three hole/stud bolt circle
Frequency Response Range
+48.000/+52.000 hertz
Frequency Response Range
+48.000 to 52.000 hertz
Resonant Reed Quantity
5
Meter Depth Behind Mounting Flange
1.375 inches
Meter Body Diameter Behind Mounting Flange
2.156 inches
Movement Type
Vibrating reed
Power Source
External
Mounting Facility Type And Quantity
3 unthreaded hole
Measurement Range
+48.0/+52.0 hertz single indicator single range
Measurement Range
+48.0 to 52.0 hertz single indicator single range
Scale Selection Method
Terminal
Circuit Attachment Method And Quantity
2 threaded stud
Phase
Single
Special Markings
Cycles
Material
Plastic
Nuclear Hardness Critical Feature
Nonhardened
Style Designator
Round flush mtg
Fsc Application Data
Test set, elect. Equip.
NSN
6625-00-556-1878
Part Number
21FX4B52
Description
Meter,electrical Frequency
CAGE
31356

An instrument which measures the rate of regularly recurring variations in an electric current or voltage and is usually calibrated in hertz (cycles per second or cps). The value may be expressed by means of a pointer and calibrated dial vibrating reed or a digital read out display. For instruments which measure radio frequencies, see calibrator, frequency; and wavementer. excludes: counter electronic digital.

Part 21FX4B52 NSN 6625-00-556-1878

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
16454
FIIG:
A310A0
Concept No.:
App. Key:
A
Cond. Code:
1
Status:
A

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators
HMIC
PMIC
ESD/EMI
ENAC
MMAC
CRITL
HMIC:
P
PMIC:
A
ESD:
ESD:
MMAC:
CRITL:
X

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
136740
UFC:
68820
LTL:
RATING VARIABLE
LCL:
--
WCC:
657
TCC:
Z
SHC:
9
ACC:
Construction Materials

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Schedule B and Export
  • Schedule B: 9030908030
  • SITC: 87479
  • End Use: Measuring, testing, control instruments
  • NAICS: 334515
  • USDA: 1

Freight Class: Parts and accessories of articles of schedule b subheading 9030.39

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