Naval Ship Systems Command · Electronic Components
LM21
Meter, Electrical Frequency
Part NumberLM21
ManufacturerNaval Ship Systems Command
AvailabilityAvailable to order — request a quote
Specifications
NSN6625-00-635-4260 (NSN)
Federal Item NameMETER,ELECTRICAL FREQUENCY
Federal Supply Class6625 — Test Instruments
Circuit Current For Which DesignedAC
MaterialALUMINUM
Operating Voltage Rating In Volts100.0 AC MINIMUM AND 130.0 AC MAXIMUM
Overall Width8.938 INCHES NOMINAL
Furnished Items And QuantityBOOK CALIBRATION,1; CABLE POWER 1
Accuracy RatingPORM 0.1 PCT FROM 2 TO 20 MHZ; PORM 0.02 PCT FROM 125 MHZ ALL INDICATORS ALL RANGES
PhaseSINGLE
Frequency Response Range+0.12 TO 20.00 MEGAHERTZ
Overall Height8.188 INCHES NOMINAL
Overall Length7.875 INCHES NOMINAL
Frequency Rating50.0 HERTZ MINIMUM AND 60.0 HERTZ MAXIMUM
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 LM21 available?
We can source LM21 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 LM21 by Naval Ship Systems Command obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If LM21 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 LM21?
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 LM21?
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.