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Vacuum Tube Voltmeter 400C

Vacuum Tube Voltmeter 400C; Hewlett-Packard, HP; (ID = 1321287) Equipment
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Vacuum Tube Voltmeter 400C; Hewlett-Packard, HP; (ID = 1321287) Equipment
Hewlett-Packard, HP;: Vacuum Tube Voltmeter 400C [Equipment] ID = 1321287 635x721
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For model Vacuum Tube Voltmeter 400C, Hewlett-Packard, (HP); Palo Alto, CA:
Source: HP Catalog 1950
Country:  United States of America (USA)
Manufacturer / Brand:  Hewlett-Packard, (HP); Palo Alto, CA
Year: 1949 ? Category: Service- or Lab Equipment
Main principle none
Wave bands - without
Power type and voltage Alternating Current supply (AC) / 115 Volt
Loudspeaker - - No sound reproduction output.
Power out
from Model: Vacuum Tube Voltmeter 400C - Hewlett-Packard, HP; Palo Alto
Material Metal case
Shape Tablemodel, with any shape - general.
Dimensions (WHD) 7.5 x 8.5 x 9.5 inch / 191 x 216 x 241 mm

Voltage Range:
12 ranges, selected on front panel switch. Full scale readings of:
0.001 V, 0.1V, 10V
0.003 V,  0.3 V,  30.0 V
0.01 V,  1.00 V,  100 V
0.03 V.  3.00  V, 300 V

Frequency Range: 20 cps to 2 mc.

The over-all accuracy of the meter is within ±3%  below 100 kc and ±5% from 100 kc to 2 mc. Line voltage variations from 105 to 125 volts or changing tubes will affect the reading by less than  3% at all frequencies
below 100 kc.

Calibrated to read rms value of sine wave. Voltage indication proportional to average value of full sine wave. Linear voltage scale with db calibration from -12% +2 dbm. 10 db intervals between voltage ranges.

Input Impedance: 10 megohms shunted by 15 µµf on
ranges 1.0 V to 300 V; 24 µµf on ranges 0.001 V  to 0.3 V.

Output Circuit: Maximum output 0.5 V corresponding to full scale deflection of meter. Internal impedance 1,000 ohms. Gain 500 when instrument is on the 0.001 volt range.

Net weight (2.2 lb = 1 kg) 15 lb 0 oz (15 lb) / 6.810 kg
Source of data -- Original prospect or advert

Model page created by Pius Steiner. See "Data change" for further contributors.

All listed radios etc. from Hewlett-Packard, (HP); Palo Alto, CA
Here you find 356 models, 322 with images and 123 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.