Bradley Odhner

Hello, sorry but we won't share schematics for those products. If you are able to localize the problem and share specific info on what's wrong we might be able to provide guidance, but perhaps not.

The 2306 is able to be repaired by us should you want it done professionally: https://www.tek.com/en/services/select-factory-service-request

For a few calibration procedures, a 2450-CAL-KIT accessory is required. This is accessory is not sold anymore, but it is simple to create, here's an FAQ that describes the fixture: https://www.tek.com/en/support/faqs/what-is-the-2450-cal-kit

Another question we frequently get with 2450 calibrations is if you can use the front panel. The front panel can be used for performance verification, but for making adjustments, the rear panel must be used.

I'm not sure why it's missing from the website, I've raised the issue, but here's the 2450 Calibration Manual.

test

Now that is very odd... that's the correct URL. I will send this to our web team.

Can you share any of those broken links?

From the KickStart product page: https://www.tek.com/en/products/keithley/keithley-control-software-bench-instruments/kickstart

Select the "Software License Options" tab, then you can select the App/Apps you want (I would guess Data Logger for your DAQ6510). Use Add to Quote and you'll be able to get a quote from there.

Hmm, there is not a command to get arbitrary text on the front panel of the 2635B. As you found, display.gettext() is only for the user screen set by display.settext(). Things like measurements, source values, and settings are meant to retrieved with their own commands. That is probably better for a remote display anyway so you can always poll important parameters rather than relying on what the 2-line display shows.

Oh good! I had read through your post but hadn't looked at the code yet. Glad you figured it out! Autozero is a very common setting to trip people up when trying to do time dependent measurements.

We do recommend using the Autozero Once command (AZER:ONCE) immediately before your test and periodically or when you have gaps in your test for the best accuracy.

How many voltage points are we talking about?

My first thought is to try sending the list to the SMU separately as new array, breaking it up if needed. In pseudocode:

writeline(K2412B, strjoin({'vlist=',VliststrPart1)});
writeline(K2412B, strjoin({'vlist=vlist..',VliststrPart2)});
writeline(K2612B, strjoin({gate_smu,'.trigger.source.listv(vlist)'}));

(".." is the concatenation function in TSP/Lua.)

Autozero measures at the same nplc as the measurement it's taking a reference for, so I would expect it to ~double the reading time of measurement.

There are a number of things that dictate when autozero measurements happen, but larger nplc will generally cause them to happen more often, perhaps even every measurement. Larger nplc reduce external error factors so the DMM attempts to reduce internal error factors by autozero-ing more often. Also, autozero measurements are considered valid for some amount of time independent of the nplc setting, so larger nplc will burn through that valid time after fewer readings. Temperature is another factor and autozero frequency can be impacted by the system uptime.