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The HP 3403C True RMS voltmeter is usable from dc to 100 MHz. True rms is especially valuable for measurements of noise, multiplexed signals, modulated waves and signals with high harmonic content. The dB display option provides readings directly in dB, a major convenience to ac users. The dB reference to which the measurement is made is conveniently adjustable from the front panel to provide referenced dB measurements, or to provide a convenient means to offset the reading by as much as 13 dB for unreferenced measurements. Specifications. Ranges; Full range display: 10.00 mV (ac only); 100.0 mV; 1.000 V; 10.00 V; 100.0 V; 1000 V. Overrange: >90% on all ranges except as limited by max input voltage. AC frequency range Slow response: 2 Hz to 100 MHz. AC frequency range Fast response: 25 Hz to 100 MHz. Input characteristics; Input impedance: < 10 MHz): 1 V to 1000 V range: 10 Mohm ± 10% shunted by 24 pF ± 10%. 10 mV and 100 mV range: 20 Mohm ± 10% shunted by 20 pF ± 10%. Maximum input voltage High to low: 1000 V rms, 1500 peak on any range. Maximum dc voltage in ac mode: 500 V dc. Options. Opt 001, autoranging. Opt 003, remote control + digital output + autoranging. Opt 006, dB display.
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