Hoyt Electrical Instrument Works, Inc. · Electronic Components
640
Voltmeter — Test Instruments
Part Number640
ManufacturerHoyt Electrical Instrument Works, Inc.
AvailabilityAvailable to order — request a quote
Specifications
NSN6625-00-811-0796 (NSN)
Federal Item NameVOLTMETER
Federal Supply Class6625 — Test Instruments
Overall Length1.445 INCHES NOMINAL
Movement TypeMOVING COIL, PERMANENT MAGNET
Overall Diameter2.281 INCHES NOMINAL
Scale Division Quantity60 SINGLE INDICATOR SINGLE RANGE
Meter Body Diameter Behind Mountin2.000 INCHES NOMINAL
Sensitivity Rating1650.0 OHMS PER VOLT
Style DesignatorROUND FLUSH MTG
Accuracy In Percent-2.0 TO 2.0 AT FULL SCALE SINGLE INDICATOR ALL RANGES
Dial Scale Marking ColorBLACK SINGLE INDICATOR SINGLE RANGE
Meter Depth Behind Mounting Flange1.078 INCHES NOMINAL
Installation DesignPANEL
Cross Sectional Shape StyleROUND
Conductor Quantity2
Strand Awg Size Per Conductor30 ALL CONDUCTORS
ColorBLACK FIRST POSITION COVER ALL CONDUCTORS
Accessory Wire Type And Quantity1 GROUND
Cross Section Outside Diameter0.365 INCHES NOMINAL
Round Conductor Size16 AWG ALL CONDUCTORS
Conductor Arrangement And Quantity2 SINGLES
Voltage Rating300.0 AC MAXIMUM RATED WORKING VOLTAGE ALL CONDUCTORS
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 640 available?
We can source 640 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 640 by Hoyt Electrical Instrument Works, Inc. obsolete or end-of-life?
We specialize in obsolete, end-of-life, and discontinued components. If 640 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 640?
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 640?
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.