HP 3466A Digital Multimeter The HP 3466A is desktop portable 4½ digit autoranging multimeter produced by Hewlett Packard in 1984. It can measure voltage, current, resistance, and offers diode test. ACV and ACI measurements are true rms with selectable ac or dc coupling. The instrument is available with rechargeable batteries or ac power only, it offers 1 µvolt and 1 mΩ sensitivity with zero adjustment on the lowest ranges to compensate for external offsets. DC Voltmeter   20mV to 1200V in 7 ranges (auto-ranging or range hold) Auto polarity 10 Mohm input resistance Common mode rejection >120dB at 50/60Hz Floating input 1200V max to ground AC Voltmeter (true rms)   200mV to 1200V in 5 ranges (auto-ranging or range hold) Average responding rms calibrated 10 Mohm input resistance Floating input 500V max to ground DC Ammeter   200µA to 2A in 5 ranges (manual range) Auto polarity Floating input 250V max to ground Fused 2A / 250V AC Ammeter   200µA to 2A in 5 ranges (manual range) Floating input 250V max to ground Fused 2A / 250V Ohmmeter   20 Ohms to 20 MOhm in 7 ranges (auto-ranging or range hold) 2-wire measurement Open circuit voltage < 5V