Vacuum Tube Voltmeter 410C

• Country
• United States of America (USA)

• Manufacturer / Brand
• Hewlett-Packard, (HP); Palo Alto, CA

• Year
• 1963

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 75333

• Picture
• Schematics

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Click on the schematic thumbnail to request the schematic as a free document.

• Number of Tubes
• 1

• Valves / Tubes
• 12AT7

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Power type and voltage
• Alternating Current supply (AC) / 115; 230 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: Vacuum Tube Voltmeter 410C - Hewlett-Packard, HP; Palo Alto

• Shape
• Tablemodel, with any shape - general.

• Dimensions (WHD)
• 130 x 165 x 279 mm / 5.1 x 6.5 x 11 inch

• Notes

• Electronic Voltmeter.
  
  DC: 15 mV to 1500 V in 15, 50 sequences, 11 ranges
  AC: 0.5 V to 300 V in 0.5, 1.5, 5 sequences, 7 ranges
  Ohmmeter: 10 Ohm to 10 MOhm, center scale in 7 ranges
  Amplifier Voltage gain: 100 max.

  Accessories: HP Model 11036A AC probe with Eimac 2-01C UHF diode.
  
  Two versions of 410C exist with different amplifier versions. Early version with 12AT7 tube and chopper assembly and late version with OP amps without tube. Both versions have the same outside appearance and specs.

  The chopper uses 4 photoresistors that read 100 kOhms when in bright illumination, over 20 MOhms when dark. They are illuminated by two selected neon bulbs (NE-2?) and driven with a 100 Hz signal.

• Net weight (2.2 lb = 1 kg)
• 4 kg / 8 lb 13 oz (8.811 lb)

• Literature/Schematics (1)
• -- Original-techn. papers.

• Author
• Model page created by Egon Penker. See "Data change" for further contributors.

• Other Models

• Here you find 395 models, 363 with images and 139 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Hewlett-Packard, (HP); Palo Alto, CA