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The HP 3400A is a true rms analog voltmeter. Six-decade frequency coverage makes the HP 3400A extremely flexible for audio and RF measurements up to 10 MHz and permits the measurement of broadband noise and fast risetime pulses. Pulses or other non-sinusoids with crest factors up to 10:1 can be measured full scale. Plots of measured data and higher resolution measurements can be produced by connecting a dmm to the convenient rear-panel dc output which produces a linear 0 to 1 volt output proportional to the meter deflection. Specifications. Voltage Range: 1 m V to 300 V full scale, 12 ranges. dB Range: -72 to + 52 dBm (0 dBm = 1 mW into 600 Ohm). Frequency range: 10 Hz to 10 MHz. Response: responds the rms value (heating value) of the input signal for all waveforms. Meter accuracy: % of full scale (20 to 30 deg. C). Crest Factor: (ratio of peak to rms amplitude of input signal): 10:1 at full scale. Input impedance: from 0.001 to 0.3V range: 10 MOhm shunted by <50 pF, 1.0 to 300 V range: 10 MOhm shunted by < 20 pF, ac coupled input. Output: negative 1 V dc into open circuit at full scale deflection, proportional to meter deflection from 10 to 100% of full scale. 1 mA maximum; nominal source impedance is 1 kOhm. Output noise is < 1 mV rms. Opt. 001 expands the dB scale by placing it on the top of the meter.
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