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The HP 34420A Nanovolt/Micro-ohm Meter has two input channels that allows voltage measurements to be made independently, or they can be mathematically combined to make difference and ratio measurements. Ohms measurements combine the low-noise input circuit s with a highly stable current source to provide outstanding low-resistance measurements. Offset compensation is employed to eliminate the effects of stray thermal EMFs that would otherwise result in measurement error. Low power ohms and a new low-voltage resistance measurement capability allow repeatable measurements to be made where a low voltage (20 mV) is required to avoid oxidation punch-thru. A wide range of temperature measurement capabilities are also built in, providing support for thermocouple, RTD, and thermistor temperature sensors. A shielded copper pin screw-down connector, a 7 1/2-digit A/D converter, 2 ppm basic dc accuracy, and a new measurement algorithm that gives 100 dB normal mode rejection without front-end filtering result in measurement capability you can depend on to make accurate and repeatable low-level measurements. Specifications. DC Voltage - 7 1/2 digits resolution all ranges, Ranges: 1 mV to 100V. Resistance - 7 1/2 digits resolution all ranges, Ranges: 1 ohm to 1 M-ohm. Low Power Resistance Ranges: 1 ohm to 100 k-ohm. Voltage Limited Resistance (Voltage limit selectable: 20 mV, 100 mV, or 500 mV): 10 ohm and 100 ohm. Test Current/Maximum Lead Resistance Ranges: 1 ohm to 1 M-ohm. Resistance: 2 or 4-wire ohm; offset compensation used on all ranges except 100 k-ohm and 1 M-ohm range; can be turned off. Temperature Thermocouple: Type B, E, J, K, N, R, S, T; Thermistor: 5 k-ohm. Interface: IEEE-488 and RS-232 standard.
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