| Data logging using an HP34401A meter and a multiplexer | |
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TES1333 schematic TES1333 gerber data Serial cable Firmware source code Firmware hex file Data logger prototype operation Using the "Questionable mask register set" command of the HP34401A, I am able to sneak 10 bits of command data into the aluminum box shown daisy chained into the meters RS232 port. With this data I control a 1-of-8 multiplexer and 8 bit digital output. The prototype used a mechanical break-before-make DPDT relay connection but the final unit uses solid state relays (400VDC/AC) that get the break-before-make function from software. My fluke hydra data logger was on loan and I needed to automate some testing which is why I built this setup; as it turns out this gives better resolution than the hydra and is now the setup I use to auto-test all my power supplies. Controlled by a
VB GUI, I am reading input and output power to measure efficiency
as well as setting the output load bank, testing the bias generator and
the enable function. The
power supply in the picture is a prototype of the TES1329 16W nixie power
supply which eventually evolved into the TES1364 4W nixie power supply.
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