PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

R491Analyzer,spectrum

Tektronix, Inc. · NSN 6625-00-455-6768 · FSC 6625 · No Item Name Available
Verified by PartsTable
NSN 6625-00-455-6768 — this item is cataloged by the U.S. Government under National Stock Number 6625-00-455-6768. Primary manufacturer part number: R491.
Features
  • Analyzer,spectrum — FSC 6625
  • Frequency Rating: 48.0 HERTZ MINIMUM AND 440.0 HERTZ MAXIMUM
  • Frequency Calibration Accuracy Range in Percent: -3.0 TO 3.0
  • Input Impedance Rating: 50.0 OHMS NOMINAL
  • Furnished Items and Quantity: 6 FT BNC CABLE,50 OHM MINATURE COAX-1.6 FT N CABLE,RG 223/U COAX-1,2 FT TNC CABLE,RG223/U COAX-1,12.4 TO 18 GHZ WAVE GUIDE MIXER-1;18 TO 26.5 GHZ WAVE GUIDE MIXER-1;26.5 TO 40.0 GHZ WAVE GUIDE MIXER-1;20 DB ATTENTUATOR-1;40 DB ATTENTUATOR-1;BNC MALE TO N FEMALE ADAPTERS-2;BNC FEMALE TO N MALE ADAPTERS-2;WAVE GUIDE MIXER ADAPTER-1;POWER CORD-1;3 TO 2 WIRE ADAPTER-1;BLUE LIGHT FILTER-1;CLEAR CRT PROTECTOR PLATE-1;ORNAMENTAL RING-1;MESH FILTER-1;ONE AMPERE FUSES-2;1/2 AMPERE FUSE-1;FRONT COVER-1;INSTRUCTIONAL MANUAL-2 GHz
  • Unit Type: STANDARD
  • Frequency Channel Quantity: 8
  • Cathode Ray Tube Displayed Information: FREQUENCY DIFFERENCES
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Analyzer,spectrum, cataloged under National Stock Number 6625-00-455-6768, is classified within Federal Supply Class 6625 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Tektronix, Inc.. Government technical data includes 24 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 2 manufacturers, enabling identification through both NSN and commercial part number lookups. 1 verified substitute exists in the FLIS interchangeability database. Current acquisition status: Active. Unit of issue: EA.

Technical Specifications
ParameterValue
NSN6625-00-455-6768
Primary Part NumberR491
Item NameAnalyzer,spectrum
FSC / FSG6625 / 66 — No Item Name Available
ManufacturerTektronix, Inc.
StatusACTIVE
Frequency Rating48.0 HERTZ MINIMUM AND 440.0 HERTZ MAXIMUM
Frequency Calibration Accuracy Range in Percent-3.0 TO 3.0
Input Impedance Rating50.0 OHMS NOMINAL
Furnished Items and Quantity6 FT BNC CABLE,50 OHM MINATURE COAX-1.6 FT N CABLE,RG 223/U COAX-1,2 FT TNC CABLE,RG223/U COAX-1,12.4 TO 18 GHZ WAVE GUIDE MIXER-1;18 TO 26.5 GHZ WAVE GUIDE MIXER-1;26.5 TO 40.0 GHZ WAVE GUIDE MIXER-1;20 DB ATTENTUATOR-1;40 DB ATTENTUATOR-1;BNC MALE TO N FEMALE ADAPTERS-2;BNC FEMALE TO N MALE ADAPTERS-2;WAVE GUIDE MIXER ADAPTER-1;POWER CORD-1;3 TO 2 WIRE ADAPTER-1;BLUE LIGHT FILTER-1;CLEAR CRT PROTECTOR PLATE-1;ORNAMENTAL RING-1;MESH FILTER-1;ONE AMPERE FUSES-2;1/2 AMPERE FUSE-1;FRONT COVER-1;INSTRUCTIONAL MANUAL-2 GHz
Unit TypeSTANDARD
Frequency Channel Quantity8
Cathode Ray Tube Displayed InformationFREQUENCY DIFFERENCES
Mounting MethodRACK
Frequency Band Quantity8
Frequency Range Rating+0.010 TO 40.000 GIGAHERTZ
AC Voltage Rating90.0 VOLTS MINIMUM AND 136.0 VOLTS MAXIMUM AND 180.0 VOLTS MINIMUM AND 272.0 VOLTS MAXIMUM
PhaseSINGLE
Individual Channel Frequency10.0 MEGAHERTZ MINIMUM AND 275.0 MEGAHERTZ MAXIMUM AND 275.0 MEGAHERTZ MINIMUM AND 900.0 MEGAHERTZ MAXIMUM AND 2.0 MEGAHERTZ MINIMUM AND 800.0 GIGAHERTZ MAXIMUM AND 1.5 GIGAHERTZ MINIMUM AND 4.0 GIGAHERTZ MAXIMUM AND 3.8 GIGAHERTZ MINIMUM AND 8.2 GIGAHERTZ MAXIMUM AND 8.2 GIGAHERTZ MINIMUM AND 12.4 GIGAHERTZ MAXIMUM AND 12.4 GIGAHERTZ MINIMUM AND 18.0 GIGAHERTZ MAXIMUM AND 18.0 GIGAHERTZ MINIMUM AND 40.0 GIGAHERTZ MAXIMUM
Frequency Rating48.0 HERTZ MINIMUM AND 440.0 HERTZ MAXIMUM
Frequency Calibration Accuracy Range in Percent-3.0 TO 3.0
Input Impedance Rating50.0 OHMS NOMINAL
Furnished Items and Quantity6 FT BNC CABLE,50 OHM MINATURE COAX-1.6 FT N CABLE,RG 223/U COAX-1,2 FT TNC CABLE,RG223/U COAX-1,12.4 TO 18 GHZ WAVE GUIDE MIXER-1;18 TO 26.5 GHZ WAVE GUIDE MIXER-1;26.5 TO 40.0 GHZ WAVE GUIDE MIXER-1;20 DB ATTENTUATOR-1;40 DB ATTENTUATOR-1;BNC MALE TO N FEMALE ADAPTERS-2;BNC FEMALE TO N MALE ADAPTERS-2;WAVE GUIDE MIXER ADAPTER-1;POWER CORD-1;3 TO 2 WIRE ADAPTER-1;BLUE LIGHT FILTER-1;CLEAR CRT PROTECTOR PLATE-1;ORNAMENTAL RING-1;MESH FILTER-1;ONE AMPERE FUSES-2;1/2 AMPERE FUSE-1;FRONT COVER-1;INSTRUCTIONAL MANUAL-2 GHz
Unit TypeSTANDARD
Frequency Channel Quantity8
Cathode Ray Tube Displayed InformationFREQUENCY DIFFERENCES
Mounting MethodRACK
Frequency Band Quantity8
Frequency Range Rating+0.010 TO 40.000 GIGAHERTZ
AC Voltage Rating90.0 VOLTS MINIMUM AND 136.0 VOLTS MAXIMUM AND 180.0 VOLTS MINIMUM AND 272.0 VOLTS MAXIMUM
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Shelf Life Code0
Criticality CodeAR
Unit of IssueEA
SMR CodeVH
Weight49.5000 lbs
Cube5.2617 cu ft
Verified Substitutes 1
5950-01-161-3334807795-3 INTERCHANGEABLE
Reactor
Raytheon Company Dba Raytheon
Cross-Reference Index
Part NumberManufacturer
625241-1 Raytheon Company (USA)
R491 PRIMARY Tektronix, Inc. (USA)
Related Parts
5950-01-161-3334INTERCHANGEABLE
REACTOR
807795-3

Frequently Asked Questions

What is NSN 6625-00-455-6768?

NSN 6625-00-455-6768 is a Analyzer,spectrum, manufactured by Tektronix, Inc., classified under FSC 6625 (No Item Name Available). Status: active.

What are the part numbers for NSN 6625-00-455-6768?

NSN 6625-00-455-6768 has 2 cross-referenced part numbers: 625241-1 (Raytheon Company), R491 (Tektronix, Inc.).

What NSN replaces 6625-00-455-6768?

There is 1 known substitute for 6625-00-455-6768: 5950-01-161-3334. Verify interchangeability with system specifications before substitution.

What are the specifications of R491?

Key specifications for R491: Frequency Rating: 48.0 HERTZ MINIMUM AND 440.0 HERTZ MAXIMUM; Frequency Calibration Accuracy Range in Percent: -3.0 TO 3.0; Input Impedance Rating: 50.0 OHMS NOMINAL; Furnished Items and Quantity: 6 FT BNC CABLE,50 OHM MINATURE COAX-1.6 FT N CABLE,RG 223/U COAX-1,2 FT TNC CABLE,RG223/U COAX-1,12.4 TO 18 GHZ WAVE GUIDE MIXER-1;18 TO 26.5 GHZ WAVE GUIDE MIXER-1;26.5 TO 40.0 GHZ WAVE GUIDE MIXER-1;20 DB ATTENTUATOR-1;40 DB ATTENTUATOR-1;BNC MALE TO N FEMALE ADAPTERS-2;BNC FEMALE TO N MALE ADAPTERS-2;WAVE GUIDE MIXER ADAPTER-1;POWER CORD-1;3 TO 2 WIRE ADAPTER-1;BLUE LIGHT FILTER-1;CLEAR CRT PROTECTOR PLATE-1;ORNAMENTAL RING-1;MESH FILTER-1;ONE AMPERE FUSES-2;1/2 AMPERE FUSE-1;FRONT COVER-1;INSTRUCTIONAL MANUAL-2 GHz. 30 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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