This is a logic analyzer that allows you to view digital logic via many channels. Scopes only have up to 4 channels but the LA supports 80 or more! Many channels are necessary depending how many bits you want to analyze at once. The LA also caputures and stores recorded signals for viewing while scopes generally don't (well some do). An LA is mainly useful to debug software and/or hardware problems. The HP 16500C supports up to 5 plug-in cards. Right now I have two LA cards that are rated for 100Mhz timing, 25Mhz state, and 80 channels each and one 2 channel oscilloscope card that runs at 400 Ms/s. I was originally going to use this unit for a scope and LA but I don't like the scope functionality compaired to standalone scopes. Overall, it is decent for an LA.
I finally bought an adjustable bench power supply. This is an HP 6023A adjustable power supply. The voltage is adjustable from 0-20v in 0.01v increments and the current is from 0-30A in 0.1A increments. It can operate in constant voltage or constant current mode and has overvoltage protection. The output voltage is spot on using my Fluke multimeter. What I found quite interesting is to test the current capabilities, the manual instructs you to short circuit the output and crank up the current! Of course you must have the correct gauge wire in order to test up to 30A (14g). The installed fan is very loud so I decided to put in a standard 80mm computer case fan since i’m not using its full current capability anyways. Luckily the mounting holes are the same but unfortunately the old fan runs off of 115v AC and the new one uses 12v DC. Using the schematics from a different model, I knew that there was an unregulated 20v output from the transformer so it was only a matter of finding it and using a 12v regulator to power the fan. I also noticed that on one of the transistor/mosfet heatsinks, there is a temperature controlled switch attached. So if it happens to overheat, it will just shut off.
Last updated May 2010
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