Test Equipment

This section documents test equipment used around the shop, including repairs. It is certainly not exhaustive, and contains just those items for which a writeup seemed interesting.

	HP 6235A Power Supply Rebuild Someone did a very poor job of packing this HP 6235A adjustable bench supply, which didn't help the water damage inside it. I wanted to use it in place of our larger Lambda LPT-7202-FM supplies for a project, so it needed rebuilt.
	HP 10544A Ovenized Oscillator Teardown and Repair This HP 10544A high stability 10 MHz oscillator module was found to be defective during the upgrade of a HP 5326B Timer/Counter/DVM. We'll open it up and have a look!
	HP 5326B Counter Repair Repair, diagnostics, and timebase upgrade on a HP 5326B 50 MHz timer/counter with DVM option and Nixie tube readout. This older counter is still a fairly useful instrument!
	General Radio 1192B Counter The General Radio (Gen-Rad) 1192B is a compact 32 MHz counter with Nixie tube readout. It's a basic unit, with features roughly equivalent to other midrange counters of the era. This one required a bit of cleanup and repair.
	Gralex Panel Meter I ended up with four of these little Gralex panel meters from some scrapped BAFCO frequency response analyzers. They're typical 1500 mV panel meters, but use Panaplex planar neon gas discharge displays.
	Krohn-Hite 5100B Function Generator The Krohn-Hite 5100B is a high quality function generator from the 1970s. It has a variety of features which make it a useful tool. This one required a little cleanup before being put into service.
	Homebrew Counter with Nixie Tubes A little homebrew or shop built counter with Nixie tube readout. This counter has been in the glow discharge project bin for a while, let's take a look at it.
	HP 59304A Numeric Display The HP 59304A is a 12-digit numeric display that connects to the HP-IB/GPIB bus. It displays up to 12 numerical digits (and a few other characters) on a Panaplex neon gas display.
	Cleaning up a HP 59309A Digital Clock HP produced a HP-IB connected digital clock, the 59309A, which was intended to serve as a clock/calendar for HP-IB (GPIB, IEEE-488) equipped computers or assemblies of test equipment. This one needed some cleanup and repair before being put into service.