HP Hewlett Packard 410C Voltmeter AC DC Ohms Multifunction Bench Meter 115/230V

HP Hewlett Packard 410C Voltmeter AC DC Ohms Multifunction Bench Meter 115/230V

The Hewlett Packard 410C is a classic analog bench voltmeter capable of measuring AC volts, DC volts, DC amps, and resistance (ohms). It uses a sensitive D'Arsonval analog meter movement with a multi-scale display reading Volts, Amps, and Ohms. A front-panel Function selector switches between AC Zero, ACV, +DCV, -DCV, Ohms, +DCA, -DCA, and AC Probe (1500V max) modes, while a separate Range selector steps through the measurement ranges for each function. The rear panel provides Ohms Adj and Zero Adj trimmers, a DC Amplifier Output for external use, and a dual-voltage IEC power inlet.

Specifications & What's Included

• Manufacturer: Hewlett-Packard (HP)
• Model: 410C Voltmeter
• Part Number: 550-08529
• Measurement functions: AC Volts, DC Volts, DC Amps, Ohms
• Display: Analog meter movement — multi-scale (Volts / Amps / Ohms)
• Function selector positions: AC Zero, ACV, +DCV, -DCV, Ohms, +DCA, -DCA, AC Probe
• AC Probe input: 1500V MAX
• AC voltage ranges: 1.5V, 5V, 15V, 50V, 150V, 500V, 1500V
• DC current ranges: 150µA, 500µA, 1.5mA, 5mA, 15mA, 50mA, 150mA
• Power: 115V / 230V AC, 50–1000 Cycles (dual-voltage)
• Power connector: IEC C13 inlet (rear panel)
• Rear panel: Ohms Adj trimmer, Zero Adj trimmer, DC Amplifier Output binding posts, Spare knob
• Form factor: Benchtop, gray metal enclosure
• Country of manufacture: USA
• Includes: Red and black test leads (attached)

Applications

The HP 410C belongs to Hewlett-Packard's line of vacuum-tube voltmeters (VTVMs) and precision analog bench meters produced from the late 1950s through the 1960s — an era when HP was establishing the standards for laboratory-grade electronic measurement. Instruments like the 410C were staples of electronics labs, university physics departments, and military/aerospace test benches, valued for their high input impedance (which minimizes circuit loading), wide measurement range, and the ability to measure both AC and DC quantities with a single instrument. The DC Amplifier Output on the rear panel allowed the meter to drive chart recorders or external monitoring equipment, a feature common in data-logging setups of the period. Today these instruments are sought by vintage electronics collectors, hobbyists restoring period equipment, and technicians who need a parts source for calibration or repair of other HP 410-series instruments.