Model: 551

Audio Level Meter

Special Features:

Ruggedized

Properties:

Circuit Current For Which Designed

Dielectric Withstanding Voltage In Volts

3000.0

Overall Length

2.312 inches

Center To Center Distance Between Mounting Facilities Parallel To Length

4.000 inches

Center To Center Distance Between Mounting Facilities Parallel To Width

3.562 inches

Overall Height

4.167 inches

Overall Width

4.645 inches

Mounting Stud Length

0.513 inches

Environmental Protection

Airtight and dust resistant and fungus resistant and heat resistant and humidity resistant and shock resistant and vibration resistant and water resistant

Furnished Items And Quantity

Nut 6; lockwasher 6; shunt wire 1; seal 1

Indicator Type

Dial w/pointer

Installation Design

Panel

Mounting Arrangement Style

Four hole/stud rectangular/square

Sensitivity Rating

75.0 milliamperes

Dial Scale Marking Color

Black single indicator all ranges and red single indicator all ranges

Accuracy In Percent

-2.0/+2.0 at full scale single indicator all ranges

Meter Depth Behind Mounting Flange

0.949 inches

Meter Body Diameter Behind Mounting Flange

2.722 inches

Movement Type

Moving coil, permanent magnet

Background Color

White single indicator all ranges

Pointer Color

Black single indicator all ranges

Power Source

External

Mounting Facility Type And Quantity

4 threaded stud

Scale Graduation Type

Nonlinear single indicator all ranges

Measurement Range

+0.0/+100.0 decibels single indicator 1st range

Measurement Range

-20.0/+3.0 voice units single indicator 2nd range

Mounting Stud Diameter

0.135 inches

Scale Selection Method

Terminal

Features Provided

Self-illumination facility

Movement Suspension Method

Jewel pivot base

Circuit Attachment Method And Quantity

2 threaded stud

Special Markings

On front, made in usa

Material

Plastic phenol-formaldehyde

Nuclear Hardness Critical Feature

Nonhardened

Surface Treatment

Paint

Special Test Features

Complies with mil-m-10304

Style Designator

Rectangular flush mtg

Fsc Application Data

Test set, elect. Equip.

NSN

6625-00-851-6064

Part Number

551

Description

Meter,audio Level

CAGE

33005

An instrument which measures the ratio of electrical power with reference to a predetermined value and is calibrated in units of sound intensity, usually decibels. The value may be expressed by means of a pointer and calibrated dial or a digital readout display. if other than audio frequency ranges, see meter, noise level.

Part 551 NSN 6625-00-851-6064

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

16456

FIIG:

A310A0

Concept No.:

App. Key:

Cond. Code:

Status:

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators

HMIC

PMIC

ESD/EMI

ENAC

MMAC

CRITL

HMIC:

PMIC:

ESD:

MMAC:

CRITL:

Packaging & Shipping

Est. Pack Size

Est. Pack Weight

Est. Item Weight

Est. Item Dim.

Pack Size:

Paclk Weight:

1.2000lbs

Item Weight:

Item Dim:

OPI

SPI No.

SPI Rev.

SPC Mkg.

LVL A

LVL B

OPI:

SPI No.:

SPI Rev.:

SPC Mkg:

LVL_A:

LVL_B:

Freight Classification

NMFC

UFC

LTL

LCL

WCC

TCC

SHC

ACC

NMFC:

136740

UFC:

68820

LTL:

RATING VARIABLE

LCL:

WCC:

657

TCC:

SHC:

ACC:

Instruments/Radio

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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