Hewlett-Packard 3400A RMS Voltmeter

NOTE: 3400A has both FET input and tube input styles

Back to HP Analog Meters Summary Page

FET INPUT : Agilent Free Manual and Schematic Download Site

Tube INPUT : BAMA Free Manual and Schematic Download Site


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$525 (1968) ...
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  • True RMS
  • Voltage Range : 1mV to 300V
  • DB Range : -72 to +52 dBm
  • Input Impedance : 10 MΩ
    0.001V to 0.3V - shunted by 40 pF
    1.0V to 300V - shunted by 15 pF
  • Frequency Range : 10Hz to 10MHz
  • Crest factor : 10 to 1 at full scale
  • Maximum Input 800 VAC Peak, 600V DC
  • Response time : for a step function, <5 seconds to respond to final value.
  • Power : 115 or 230 VAC 10%, approx. 7W, 50 to 1000 Hz
  • Weight : 7¼ Pounds
  • 5% of full scale (10 to 50Hz)
  • 1% (50Hz to 1MHz),
  • 2% (1 to 2MHz)
  • 3% (2 to 3MHz)
  • 5% (3 to 10MHz)
    Description
    The Hewlett-Packard Model 3400A is a true root-mean-square (rms) voltmeter, providing a meter indication proportional to the dc heating power of the input waveform. In addition to its meter indication, the Model 3400A provides a dc output proportional to meter deflection making it a usefil true rms detector for graphic recording and digitizing with a dc digital voltmeter.
    Versatility
    Versatility of the Model 3400A is enhanced by its wide 10-Hz to 10-MHz frequency response, high crest factor, 1-mV to 300-Volt full-scale sensitivity and 10-MΩ input impedance. Six-decade frequency coverage makes the 3400A extremely flexible for all of your audio and most rf measurements and permits the measurement of broadband noise and fast-rise pulse. A wide range of sensitivity (12 ranges) allows you to measure anything from "down in the grass" signal and noise, to transmitter and amplifier outputs (with 30-dB overload protection). Pulses or other non-sinusoids with crest factors (ratio of peak to rms) up to 10:1 can be measured full scale. Crest factor is inversely proportional to meter deflection, permitting up to 100:1 crest factor at 10% of full scale. The ability of the 3400A to accept waveforms with such large crest factors insures accurate noise and pulse measurements, without the need for correction factors. Permanent plots of measured data and higher resolution measurements can be obtained by connecting an X-Y plotter, strip chart recorder or digital voltmeter to the convenient rear-panel dc output. The dc output provides a linear 0 to 1-volt drive, proportional to meter deflection.
    True-rms current measurements can be made conveniently by using the HP Model 456A Current Probe with the Model 3400A.