RE: Keithley 2450 Zener diode test

robrenz — Fri, 01 Nov 2013 17:03:41 GMT

Keithley tech support says the log scale is as intended and that there was a lot of discussion on how to show it. They said that that format is somewhat common in the industry and why they picked it. I suggested the flipped "negative log" scale or shabaz's suggestion of a different color for the plotted values that are actually negative. These will be considered for enhancements. I also reported some graphing bugs that will be addressed.

RE: Keithley 2450 Zener diode test

shabaz — Wed, 30 Oct 2013 13:43:50 GMT

Hi Rob,

Nice graphs! It is showing an incredible amount of detail. Clearly some very nice analog circuitry in the box. The log one is correct, without having an unusual/ fake y-axis - the easiest way to see this is to notice that as the values get smaller, it would need a very long axis (infinitely long) to reach zero amps.

When I initially saw the roadtest, I was wondering if the built-in screen could do sufficient justice to the information it could capture, or if it would need to be permanently tethered to a PC. At first glance these screenshots show that the built-in display and graphing routines are highly competent.