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The HP 3440A is a plug‑in style digital voltmeter designed for HP modular systems and bench racks. It was offered as a versatile measurement unit with a focus on accurate DC voltage and resistance readings, remote triggering, and digital outputs for system automation. With the appropriate plug-in, it can also measure AC voltage, and DC…
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The HP 8443A is a compact, rackable tracking generator and frequency counter designed to work with HP spectrum analyzers; it produces a swept CW output that follows the analyzer marker for easy swept-response and marker‑based measurements, while offering a built‑in counter and stable 1 MHz timebase for accurate frequency readout. Overview The HP 8443A Tracking…
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Overview The DM 5010 was designed as a modular, rack‑mountable multimeter module for Tektronix’s TM5000 series mainframes. It combines a 4½‑digit display resolution with a microprocessor‑based front end and keypad control, letting users run measurements locally or automate them over IEEE‑488/GPIB for test systems and production environments. Key Specifications I have two Tektronix DM 5010…
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I had described how to upgrade the firmware in the GigaPan Epic Pro to the latest (and last version). I also mentioned that it may be necessary to rebuild the battery packs at some point. This post describes the process of rebuilding the battery pack for the Epic Pro. Note: Working on charged Nimh battery…
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Note: Originally posted in November 2013. This post refers to the Nest thermostat Generation 1, which has been deprecated by Google. That said, the information regarding wiring connections still applies. Nest thermostat battery charging problem and solution My Nest (Generation 1) had been working flawlessly for several months, both summer and winter (heating and cooling)…
Shaun Merrigan
Classic Electronic Restoration, Vacuum Tube Audio, Technical History, Photography