Keystone Electronics · Electronic Components
491
Knobs & Dials HNDL BRS N PL 5.00
Part Number491
ManufacturerKeystone Electronics
AvailabilityAvailable to order — request a quote
Specifications
NSN6625-00-494-2937 (NSN)
Federal Item NameANALYZER,SPECTRUM
Federal Supply Class6625 — Test Instruments
Overall Width12.870 INCHES NOMINAL
Overall Length19.650 INCHES NOMINAL
Overall Height6.900 INCHES NOMINAL
Reference Data And LiteratureT.O. 33A1-5-288-1
Unit TypeSTANDARD
Furnished Items And QuantityCOAX CABLE 2; PROTECTIVE COVER 1; VIEWING HOOD 1; OPERATORS MANUAL 1; SERVICE MANUAL 1; ADAPTER 1; FUSE 1; CRT LIGHT FIL
Mounting MethodCASE MOUNTED PORTABLE
Cathode Ray Tube Displayed InformaREFERENCE LEVEL; FREQUENCY; VERTICAL DISPLAY; FREQUENCY SPAN; FREQUENCY RANGE; RESOLUTION BANDWIDTH; RF ATTENUATION
Vendor Part NumbersA20790A, U525-02, ANUSM366V1
ESD/EMICode A — ESD/EMI sensitive item
Precious MaterialSILVER
Cross Sectional Width0.035 INCHES NOMINAL
Surface Treatment Document And ClaASTM B298 ASSN STD SINGLE TREATMENT RESPONSE CORE CONDUCTOR ALL CONDUCTORS
Conductor FormSOLID ALL CONDUCTORS
Round Conductor Size30 AWG ALL CONDUCTORS
Precious Material And LocationSURFACE ALL CONDUCTORS SILVER
Surface TreatmentSILVER CORE CONDUCTOR ALL CONDUCTORS
Conductor Arrangement And Quantity3 TWISTED TOGETHER W/NO OUTER COVERING
Material Document And ClassificatiASTM B170 ASSN STD SINGLE MATERIAL RESPONSE CORE CONDUCTOR ALL CONDUCTORS
Voltage Rating300.0 MAXIMUM ROOT MEAN SQUARE (RMS) OPERATING VOLTAGE ALL CONDUCTORS
Cross Sectional Height0.035 INCHES NOMINAL
RH Electronics, Inc. — independent stocking distributor since 1982.
Every shipment inspected on receipt · ISO 9001:2015 · ANSI/ESD S20.20 · ERAI member since 1998 · GIDEP participant
Every shipment inspected on receipt · ISO 9001:2015 · ANSI/ESD S20.20 · ERAI member since 1998 · GIDEP participant
Frequently asked
Is 491 available?
We can source 491 even if it isn't in our active stock list. As an independent distributor we reach inventory outside the franchise channel — including hard-to-find and obsolete parts. Send us a quote request.
Is 491 by Keystone Electronics obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 491 has been discontinued, we can often source remaining stock or qualified alternates. Contact us with your quantity and target date.
How does RH Electronics verify parts like 491?
Every incoming shipment is inspected under our ISO 9001:2015 quality system — documentation, markings, and construction checked against known-good references. For deeper analysis, we direct work through accredited independent labs. We've been an ERAI member since 1998 and a GIDEP participant.
Can you find a cross-reference or alternate for 491?
Yes. Our team reads part numbers the way they were designed — decoding family, speed, temperature grade, package, and reliability level — to identify acceptable alternates when the exact part isn't available. Submit a quote request and we'll advise.