Description

The HP 34401A is a 6½-digit high-performance digital multimeter that’s been a favorite in labs and test benches for years. Originally developed by Hewlett-Packard (later Agilent, now Keysight), it’s known for its precision, reliability, and versatility. Here’s a quick snapshot of what it offers: - Measurement functions: DC/AC voltage and current, 2- and 4-wire resistance, frequency, period, diode test, and continuity. - Accuracy: Up to 0.0035% for DC voltage. - Speed: Can log up to 1,000 readings per second. - Interfaces: Built-in GPIB (IEEE-488) and RS-232 for system integration. - Memory: Stores up to 512 readings internally. - Display: Bright vacuum fluorescent display with intuitive front-panel controls. Although it was officially discontinued in 2016, it’s still widely used and respected in the electronics community. If you're considering one, you can still find refurbished units online—for example, this listing on Alibaba has it for around $590. Are you thinking of buying one, or do you already have one on your bench?