Keysight Technologies Inc. · Electronic Components
540B
Converter, Frequency, Electronic
Part Number540B
ManufacturerKeysight Technologies Inc.
AvailabilityAvailable to order — request a quote
Specifications
NSN5985-00-080-7204 (NSN)
Federal Item NameCONVERTER,FREQUENCY,ELECTRONIC
Federal Supply Class5985 — Antennas and Waveguides
Entry Date70-12-01
External Ac Operating Voltage In V115.0 MINIMUM SINGLE VOLTAGE AND 230.0 MAXIMUM SINGLE VOLTAGE
Reference Data And LiteratureDEPT OF ARMY PUBLICATIONS: TB9-6625-336-50,19 NOV 64; TM11-6625-493-15 W/ CHANGES 1 & 2,29 SEP 64; TM 11-6625-493-20P; T
Functional DescriptionEXTENDS FREQUENCY MEASUREMENT RANGE OF AN/USM-26 & AN/USM-207A INTO MICROWAVE RANGE; ALONG W/ AN/USM-26 OR -207A CAN MEA
Type Model DesignationCM-77A/USM
Frequency Per Channel10.0 MEGAHERTZ MINIMUM OPERATING CHANNEL AND 12.4 GIGAHERTZ MAXIMUM OPERATING CHANNEL
Functional ClassificationAA-6.3
Operating Ac Frequency In Hertz50.0 MINIMUM SINGLE VOLTAGE AND 1000.0 MAXIMUM SINGLE VOLTAGE
Relationship To Similar EquipmentINTERCHANGEABLE W/ 6625009739267 & 6625007355167; SIMILAR TO CM-77/USM
PhaseSINGLE
Circuit Construction TypeELECTRON TUBE
Vendor Part NumbersCM77AUSM, CM-77A/USM
Cancelled NSN6625-00-788-3780 (cancelled)
Calibration Range Quantity14
Frequency Rating5.0 HERTZ MINIMUM AND 1.0 MEGAHERTZ MAXIMUM
Overall Width7.750 INCHES NOMINAL
Overall Length17.000 INCHES NOMINAL
Overall Height7.000 INCHES NOMINAL
Ac Voltage Rating0.5 VOLTS MINIMUM AND 1.0 KILOVOLTS MAXIMUM
Dc Voltage Rating0.5 VOLTS MINIMUM AND 1.0 KILOVOLTS MAXIMUM
Mounting MethodBENCH AND CASE MOUNTED PORTABLE
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 540B available?
We can source 540B 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 540B by Keysight Technologies Inc. obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 540B 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 540B?
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 540B?
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.